def context_infer(pooled_features):
with tf.variable_scope("fc", reuse=True):
weights = tf.stop_gradient(tf.get_variable("weights"))
# b = tf.stop_gradient(tf.get_variable("biases"))
z = tf.stop_gradient(pooled_features) #Nx64
z = tf.expand_dims(z, -1) # Nx64x1
w = weights # 64x10
w = tf.expand_dims(w, 0) # 1x64x10
mean, variance = tf.nn.moments(w, [1], keep_dims=True) #1x1x10
response = tf.reduce_sum(tf.mul(z, w), 1, keep_dims=True) # Nx1x10
response_vec = tf.mul(response, w) # Nx64x10
response_vec = tf.div(response_vec, variance) # Nx64x10
h = tf.sub(z, response_vec) # Nx64x10
weights_initializer = tf.truncated_normal_initializer(
stddev=FC_WEIGHT_STDDEV)
with tf.variable_scope("context", reuse=True):
context_weights = tf.stop_gradient(tf.get_variable("weights"))
biases = tf.stop_gradient(tf.get_variable("biases"))
context_weights = tf.expand_dims(context_weights, 0)
biases = tf.expand_dims(biases, 0)
scores = tf.reduce_sum(tf.mul(h, context_weights), 1) + biases
# TODO how to deal with b?
return scores
def get_dynamic_rebar_gradient(self):
"""Get the dynamic rebar gradient (t, eta optimized)."""
tiled_pre_temperature = tf.tile([self.pre_temperature_variable],
[self.batch_size])
temperature = tf.exp(tiled_pre_temperature)
hardELBO, nvil_gradient, logQHard = self._create_hard_elbo()
if self.hparams.quadratic:
gumbel_cv, extra = self._create_gumbel_control_variate_quadratic(logQHard, temperature=temperature)
else:
gumbel_cv, extra = self._create_gumbel_control_variate(logQHard, temperature=temperature)
f_grads = self.optimizer_class.compute_gradients(tf.reduce_mean(-nvil_gradient))
eta = {}
h_grads, eta_statistics = self.multiply_by_eta_per_layer(
self.optimizer_class.compute_gradients(tf.reduce_mean(gumbel_cv)),
eta)
model_grads = U.add_grads_and_vars(f_grads, h_grads)
total_grads = model_grads
# Construct the variance objective
g = U.vectorize(model_grads, set_none_to_zero=True)
self.maintain_ema_ops.append(self.ema.apply([g]))
gbar = 0 #tf.stop_gradient(self.ema.average(g))
variance_objective = tf.reduce_mean(tf.square(g - gbar))
reinf_g_t = 0
if self.hparams.quadratic:
for layer in xrange(self.hparams.n_layer):
gumbel_learning_signal, _ = extra[layer]
df_dt = tf.gradients(gumbel_learning_signal, tiled_pre_temperature)[0]
reinf_g_t_i, _ = self.multiply_by_eta_per_layer(
self.optimizer_class.compute_gradients(tf.reduce_mean(tf.stop_gradient(df_dt) * logQHard[layer])),
eta)
reinf_g_t += U.vectorize(reinf_g_t_i, set_none_to_zero=True)
reparam = tf.add_n([reparam_i for _, reparam_i in extra])
else:
gumbel_learning_signal, reparam = extra
df_dt = tf.gradients(gumbel_learning_signal, tiled_pre_temperature)[0]
reinf_g_t, _ = self.multiply_by_eta_per_layer(
self.optimizer_class.compute_gradients(tf.reduce_mean(tf.stop_gradient(df_dt) * tf.add_n(logQHard))),
eta)
reinf_g_t = U.vectorize(reinf_g_t, set_none_to_zero=True)
reparam_g, _ = self.multiply_by_eta_per_layer(
self.optimizer_class.compute_gradients(tf.reduce_mean(reparam)),
eta)
reparam_g = U.vectorize(reparam_g, set_none_to_zero=True)
reparam_g_t = tf.gradients(tf.reduce_mean(2*tf.stop_gradient(g - gbar)*reparam_g), self.pre_temperature_variable)[0]
variance_objective_grad = tf.reduce_mean(2*(g - gbar)*reinf_g_t) + reparam_g_t
debug = { 'ELBO': hardELBO,
'etas': eta_statistics,
'variance_objective': variance_objective,
}
return total_grads, debug, variance_objective, variance_objective_grad
def build_loss(self):
"""
Loss function to minimize, whose gradient is a stochastic
gradient inspired by adaptive importance sampling.
loss = E_{p(z | x)} [ log p(z | x) - log q(z; lambda) ]
is equivalent to minimizing
E_{p(z | x)} [ log p(x, z) - log q(z; lambda) ]
\approx 1/B sum_{b=1}^B
w_norm(z^b; lambda) (log p(x, z^b) - log q(z^b; lambda))
with gradient
\approx - 1/B sum_{b=1}^B
w_norm(z^b; lambda) grad_{lambda} log q(z^b; lambda)
where + z^b ~ q(z^b; lambda)
+ w_norm(z^b; lambda) = w(z^b; lambda) / sum_{b=1}^B w(z^b; lambda)
+ w(z^b; lambda) = p(x, z^b) / q(z^b; lambda)
"""
x = self.data.sample(self.n_data)
z, self.samples = self.variational.sample(self.n_minibatch)
q_log_prob = tf.zeros([self.n_minibatch], dtype=tf.float32)
for i in range(self.variational.num_factors):
q_log_prob += self.variational.log_prob_i(i, tf.stop_gradient(z))
# normalized importance weights
log_w = self.model.log_prob(x, z) - q_log_prob
log_w_norm = log_w - log_sum_exp(log_w)
w_norm = tf.exp(log_w_norm)
self.loss = tf.reduce_mean(w_norm * log_w)
return -tf.reduce_mean(q_log_prob * tf.stop_gradient(w_norm))
def _step(self, J, voltage, refractory, dt):
delta_t = tf.clip_by_value(dt - refractory, self.zero, dt)
dV = (voltage - J) * tf.expm1(-delta_t / self.tau_rc)
voltage += dV
spiked = voltage > self.one
spikes = tf.cast(spiked, J.dtype) * self.alpha
partial_ref = -self.tau_rc * tf.log1p((self.one - voltage) /
(J - self.one))
# FastLIF version (linearly approximate spike time when calculating
# remaining refractory period)
# partial_ref = signals.dt * (voltage - self.one) / dV
refractory = tf.where(spiked, self.tau_ref - partial_ref,
refractory - dt)
voltage = tf.where(spiked, self.zeros,
tf.maximum(voltage, self.min_voltage))
# we use stop_gradient to avoid propagating any nans (those get
# propagated through the cond even if the spiking version isn't
# being used at all)
return (tf.stop_gradient(spikes), tf.stop_gradient(voltage),
tf.stop_gradient(refractory))
def get_next_input(output):
# the next location is computed by the location network
baseline = tf.sigmoid(tf.matmul(output,Wb_h_b) + Bb_h_b)
baselines.append(baseline)
# compute the next location, then impose noise
if eyeCentered:
# add the last sampled glimpse location
# TODO max(-1, min(1, u + N(output, sigma) + prevLoc))
mean_loc = tf.maximum(-1.0, tf.minimum(1.0, tf.matmul(output, Wl_h_l) + sampled_locs[-1] ))
else:
mean_loc = tf.matmul(output, Wl_h_l)
# mean_loc = tf.stop_gradient(mean_loc)
mean_locs.append(mean_loc)
mean_locs_stopGrad.append(tf.stop_gradient(mean_loc))
# add noise
# sample_loc = tf.tanh(mean_loc + tf.random_normal(mean_loc.get_shape(), 0, loc_sd))
sample_loc = tf.maximum(-1.0, tf.minimum(1.0, mean_loc + tf.random_normal(mean_loc.get_shape(), 0, loc_sd)))
# don't propagate throught the locations
# sample_loc = tf.stop_gradient(sample_loc)
sampled_locs.append(sample_loc)
sampled_locs_stopGrad.append(tf.stop_gradient(sample_loc))
return get_glimpse(sample_loc)
def energy(self, visible_state, hidden_state, scope='energy'):
with tf.variable_scope(scope):
visible_state = tf.stop_gradient(visible_state, name="visible_state")
hidden_state = tf.stop_gradient(hidden_state, name="hidden_state")
energy = -tf.reduce_mean(tf.reduce_sum(tf.multiply(tf.matmul(visible_state, self.W, name='visible_weights'),
hidden_state, name='weights_hidden')
, axis=1, name='energy_sum'), name="batch_energy_mean")
if self.visible.use_bias:
if self.visible.binary:
energy = tf.add(energy, -tf.reduce_mean(
tf.reduce_sum(tf.multiply(self.visible.bias, visible_state, name='visible_bias_energy'), axis=1)))
else:
v = visible_state - self.visible.bias
energy = tf.add(energy, tf.reduce_mean(tf.reduce_sum(tf.multiply(v, v) / 2, axis=1)))
if self.hidden.use_bias:
if self.hidden.binary:
energy = tf.add(energy, -tf.reduce_mean(
tf.reduce_sum(tf.multiply(self.hidden.bias, hidden_state, name='hidden_bias_energy'), axis=1)))
else:
h = hidden_state - self.hidden.bias
energy = tf.add(energy, tf.reduce_mean(tf.reduce_sum(tf.multiply(h, h) / 2, axis=1)))
return energy
def _create_gumbel_control_variate(self, logQHard, temperature=None):
'''Calculate gumbel control variate.
'''
if temperature is None:
temperature = self.hparams.temperature
logQ, softSamples = self._recognition_network(sampler=functools.partial(
self._random_sample_soft, temperature=temperature))
softELBO, _ = self._generator_network(softSamples, logQ)
logQ = tf.add_n(logQ)
# Generate the softELBO_v (should be the same value but different grads)
logQ_v, softSamples_v = self._recognition_network(sampler=functools.partial(
self._random_sample_soft_v, temperature=temperature))
softELBO_v, _ = self._generator_network(softSamples_v, logQ_v)
logQ_v = tf.add_n(logQ_v)
# Compute losses
learning_signal = tf.stop_gradient(softELBO_v)
# Control variate
h = (tf.stop_gradient(learning_signal) * tf.add_n(logQHard)
- softELBO + softELBO_v)
extra = (softELBO_v, -softELBO + softELBO_v)
return h, extra
def latent_prediction_model(inputs,
ed_attention_bias,
latents_discrete,
latents_dense,
hparams,
name="latent_prediction"):
"""Transformer-based latent prediction model.
It is an autoregressive decoder over latents_discrete given inputs.
Args:
inputs: Tensor of shape [batch, length_kv, hparams.hidden_size]. Inputs to
attend to for the decoder on latents.
ed_attention_bias: Tensor which broadcasts with shape [batch,
hparams.num_heads, length_q, length_kv]. Encoder-decoder attention bias.
latents_discrete: Tensor of shape [batch, length_q, vocab_size].
One-hot latents to compute log-probability of given inputs.
latents_dense: Tensor of shape [batch, length_q, hparams.hidden_size].
hparams: tf.contrib.training.HParams.
name: string, variable scope.
Returns:
latents_pred: Tensor of shape [batch, length_q, hparams.hidden_size].
latents_pred_loss: Tensor of shape [batch, length_q].
"""
with tf.variable_scope(name):
if hparams.mode != tf.estimator.ModeKeys.PREDICT:
latents_pred = transformer_latent_decoder(
tf.stop_gradient(latents_dense), inputs, ed_attention_bias,
hparams, name)
_, latent_pred_loss = ae_latent_softmax(
latents_pred, tf.stop_gradient(latents_discrete), hparams)
return latents_pred, latent_pred_loss
def rnn_decoder(cell, inputs, initial_state, embedding_size, embedding_length, sequence_length,
name='RNNDecoder', reuse=False, use_inputs_prob=0.0, static_input=None):
with tf.variable_scope(name, reuse=reuse):
# print(tf.get_variable_scope().reuse, tf.get_variable_scope().name)
with tf.name_scope("embedding"):
batch_size = tf.shape(initial_state)[0]
embedding_table = tf.get_variable(
name='embedding_table',
shape=[embedding_length, embedding_size],
initializer=tf.truncated_normal_initializer(stddev=glorot_mul(embedding_length, embedding_size)),
)
# 0 is index for _SOS_ (start of sentence symbol)
initial_embedding = tf.gather(embedding_table, tf.zeros(tf.pack([batch_size]), tf.int32))
states = [initial_state]
outputs = []
outputs_softmax = []
decoder_outputs_argmax_embedding = []
for j in range(sequence_length):
with tf.variable_scope(tf.get_variable_scope(), reuse=True if j > 0 else None):
# get input :
# either feedback the previous decoder argmax output
# or use the provided input (note that you have to use the previous input (index si therefore -1)
input = initial_embedding
if j > 0:
true_input = tf.gather(embedding_table, inputs[j - 1])
decoded_input = decoder_outputs_argmax_embedding[-1]
choice = tf.floor(tf.random_uniform([1], use_inputs_prob, 1 + use_inputs_prob, tf.float32))
input = choice * true_input + (1.0 - choice) * decoded_input
if static_input:
input = tf.concat(1, [input, static_input])
# print(tf.get_variable_scope().reuse, tf.get_variable_scope().name)
output, state = cell(input, states[-1])
projection = linear(
input=output,
input_size=cell.output_size,
output_size=embedding_length,
name='output_linear_projection'
)
outputs.append(projection)
states.append(state)
softmax = tf.nn.softmax(projection, name="output_softmax")
# we do no compute the gradient trough argmax
output_argmax = tf.stop_gradient(tf.argmax(softmax, 1))
# we do no compute the gradient for embeddings when used with noisy argmax outputs
output_argmax_embedding = tf.stop_gradient(tf.gather(embedding_table, output_argmax))
decoder_outputs_argmax_embedding.append(output_argmax_embedding)
outputs_softmax.append(tf.expand_dims(softmax, 1))
# remove the initial state
states = states[1:]
return states, outputs, outputs_softmax
def self_kl(self, logits,
sampling_dim, act_dim, act_type):
"""Calculate KL of distribution with itself.
Used layer only for the gradients.
"""
if self.env_spec.is_discrete(act_type):
probs = tf.nn.softmax(logits)
log_probs = tf.nn.log_softmax(logits)
self_kl = tf.reduce_sum(
tf.stop_gradient(probs) *
(tf.stop_gradient(log_probs) - log_probs), -1)
elif self.env_spec.is_box(act_type):
means = logits[:, :sampling_dim / 2]
std = logits[:, sampling_dim / 2:]
my_means = tf.stop_gradient(means)
my_std = tf.stop_gradient(std)
self_kl = tf.reduce_sum(
tf.log(std / my_std) +
(tf.square(my_std) + tf.square(my_means - means)) /
(2.0 * tf.square(std)) - 0.5,
-1)
else:
assert False
return self_kl
def loop_function(prev, i, log_beam_probs, beam_path, beam_symbols):
if output_projection is not None:
prev = nn_ops.xw_plus_b(
prev, output_projection[0], output_projection[1])
# prev= prev.get_shape().with_rank(2)[1]
probs = tf.log(tf.nn.softmax(prev))
if i > 1:
probs = tf.reshape(probs + log_beam_probs[-1],
[-1, beam_size * num_symbols])
best_probs, indices = tf.nn.top_k(probs, beam_size)
indices = tf.stop_gradient(tf.squeeze(tf.reshape(indices, [-1, 1])))
best_probs = tf.stop_gradient(tf.reshape(best_probs, [-1, 1]))
symbols = indices % num_symbols # Which word in vocabulary.
beam_parent = indices // num_symbols # Which hypothesis it came from.
beam_symbols.append(symbols)
beam_path.append(beam_parent)
log_beam_probs.append(best_probs)
# Note that gradients will not propagate through the second parameter of
# embedding_lookup.
emb_prev = embedding_ops.embedding_lookup(embedding, symbols)
emb_prev = tf.reshape(emb_prev,[beam_size,embedding_size])
# emb_prev = embedding_ops.embedding_lookup(embedding, symbols)
if not update_embedding:
emb_prev = array_ops.stop_gradient(emb_prev)
return emb_prev
def virtual_adversarial_loss_bidir(logits, embedded, inputs,
logits_from_embedding_fn):
"""Virtual adversarial loss for bidirectional models."""
logits = tf.stop_gradient(logits)
f_inputs, _ = inputs
weights = _end_of_seq_mask(f_inputs.labels)
perturbs = [
_mask_by_length(tf.random_normal(shape=tf.shape(emb)), f_inputs.length)
for emb in embedded
]
for _ in xrange(FLAGS.num_power_iteration):
perturbs = [
_scale_l2(d, FLAGS.small_constant_for_finite_diff) for d in perturbs
]
d_logits = logits_from_embedding_fn(
[emb + d for (emb, d) in zip(embedded, perturbs)])
kl = _kl_divergence_with_logits(logits, d_logits, weights)
perturbs = tf.gradients(
kl,
perturbs,
aggregation_method=tf.AggregationMethod.EXPERIMENTAL_ACCUMULATE_N)
perturbs = [tf.stop_gradient(d) for d in perturbs]
perturbs = [
_scale_l2(_mask_by_length(d, f_inputs.length), FLAGS.perturb_norm_length)
for d in perturbs
]
vadv_logits = logits_from_embedding_fn(
[emb + d for (emb, d) in zip(embedded, perturbs)])
return _kl_divergence_with_logits(logits, vadv_logits, weights)
def _logits_cumulative(self, inputs, stop_gradient):
"""Evaluate logits of the cumulative densities.
Arguments:
inputs: The values at which to evaluate the cumulative densities, expected
to be a `Tensor` of shape `(channels, 1, batch)`.
stop_gradient: Boolean. Whether to add `tf.stop_gradient` calls so
that the gradient of the output with respect to the density model
parameters is disconnected (the gradient with respect to `inputs` is
left untouched).
Returns:
A `Tensor` of the same shape as `inputs`, containing the logits of the
cumulative densities evaluated at the given inputs.
"""
logits = inputs
for i in range(len(self.filters) + 1):
matrix = self._matrices[i]
if stop_gradient:
matrix = tf.stop_gradient(matrix)
logits = tf.linalg.matmul(matrix, logits)
bias = self._biases[i]
if stop_gradient:
bias = tf.stop_gradient(bias)
logits += bias
if i < len(self._factors):
factor = self._factors[i]
if stop_gradient:
factor = tf.stop_gradient(factor)
logits += factor * tf.math.tanh(logits)
return logits
def _create_gumbel_control_variate_quadratic(self, logQHard, temperature=None):
'''Calculate gumbel control variate.
'''
if temperature is None:
temperature = self.hparams.temperature
h = 0
extra = []
for layer in xrange(self.hparams.n_layer):
logQ, softSamples = self._recognition_network(sampler=functools.partial(
self._random_sample_switch, switch_layer=layer, temperature=temperature))
softELBO, _ = self._generator_network(softSamples, logQ)
# Generate the softELBO_v (should be the same value but different grads)
logQ_v, softSamples_v = self._recognition_network(sampler=functools.partial(
self._random_sample_switch_v, switch_layer=layer, temperature=temperature))
softELBO_v, _ = self._generator_network(softSamples_v, logQ_v)
# Compute losses
learning_signal = tf.stop_gradient(softELBO_v)
# Control variate
h += (tf.stop_gradient(learning_signal) * logQHard[layer]
- softELBO + softELBO_v)
extra.append((softELBO_v, -softELBO + softELBO_v))
return h, extra
def target_critic_net(self, states, actions, for_critic_loss=False):
"""Returns the output of the target critic network.
The target network is used to compute stable targets for training.
Args:
states: A [batch_size, num_state_dims] tensor representing a batch
of states.
actions: A [batch_size, num_action_dims] tensor representing a batch
of actions.
Returns:
q values: A [batch_size] tensor of q values.
Raises:
ValueError: If `states` or `actions' do not have the expected dimensions.
"""
self._validate_states(states)
self._validate_actions(actions)
values1 = tf.stop_gradient(
self._target_critic_net(states, actions,
for_critic_loss=for_critic_loss))
values2 = tf.stop_gradient(
self._target_critic_net2(states, actions,
for_critic_loss=for_critic_loss))
if for_critic_loss:
return values1, values2
return values1
def build_graph(self, state, action, futurereward, action_prob):
logits, value = self._get_NN_prediction(state)
value = tf.squeeze(value, [1], name='pred_value') # (B,)
policy = tf.nn.softmax(logits, name='policy')
is_training = get_current_tower_context().is_training
if not is_training:
return
log_probs = tf.log(policy + 1e-6)
log_pi_a_given_s = tf.reduce_sum(
log_probs * tf.one_hot(action, NUM_ACTIONS), 1)
advantage = tf.subtract(tf.stop_gradient(value), futurereward, name='advantage')
pi_a_given_s = tf.reduce_sum(policy * tf.one_hot(action, NUM_ACTIONS), 1) # (B,)
importance = tf.stop_gradient(tf.clip_by_value(pi_a_given_s / (action_prob + 1e-8), 0, 10))
policy_loss = tf.reduce_sum(log_pi_a_given_s * advantage * importance, name='policy_loss')
xentropy_loss = tf.reduce_sum(policy * log_probs, name='xentropy_loss')
value_loss = tf.nn.l2_loss(value - futurereward, name='value_loss')
pred_reward = tf.reduce_mean(value, name='predict_reward')
advantage = tf.sqrt(tf.reduce_mean(tf.square(advantage)), name='rms_advantage')
entropy_beta = tf.get_variable('entropy_beta', shape=[],
initializer=tf.constant_initializer(0.01), trainable=False)
cost = tf.add_n([policy_loss, xentropy_loss * entropy_beta, value_loss])
cost = tf.truediv(cost, tf.cast(tf.shape(futurereward)[0], tf.float32), name='cost')
summary.add_moving_summary(policy_loss, xentropy_loss,
value_loss, pred_reward, advantage,
cost, tf.reduce_mean(importance, name='importance'))
return cost
def virtual_adversarial_loss_bidir(logits, embedded, inputs,
logits_from_embedding_fn):
"""Virtual adversarial loss for bidirectional models."""
logits = tf.stop_gradient(logits)
f_inputs, _ = inputs
weights = f_inputs.eos_weights
if FLAGS.single_label:
indices = tf.stack([tf.range(FLAGS.batch_size), f_inputs.length - 1], 1)
weights = tf.expand_dims(tf.gather_nd(f_inputs.eos_weights, indices), 1)
assert weights is not None
perturbs = [
_mask_by_length(tf.random_normal(shape=tf.shape(emb)), f_inputs.length)
for emb in embedded
]
for _ in xrange(FLAGS.num_power_iteration):
perturbs = [
_scale_l2(d, FLAGS.small_constant_for_finite_diff) for d in perturbs
]
d_logits = logits_from_embedding_fn(
[emb + d for (emb, d) in zip(embedded, perturbs)])
kl = _kl_divergence_with_logits(logits, d_logits, weights)
perturbs = tf.gradients(
kl,
perturbs,
aggregation_method=tf.AggregationMethod.EXPERIMENTAL_ACCUMULATE_N)
perturbs = [tf.stop_gradient(d) for d in perturbs]
perturbs = [_scale_l2(d, FLAGS.perturb_norm_length) for d in perturbs]
vadv_logits = logits_from_embedding_fn(
[emb + d for (emb, d) in zip(embedded, perturbs)])
return _kl_divergence_with_logits(logits, vadv_logits, weights)
def get_muprop_gradient(self):
"""
random sample function that actually returns mean
new forward pass that returns logQ as a list
can get x_i from samples
"""
# Hard loss
logQHard, hardSamples = self._recognition_network()
hardELBO, reinforce_model_grad = self._generator_network(hardSamples, logQHard)
# Soft loss
logQ, muSamples = self._recognition_network(sampler=self._mean_sample)
muELBO, _ = self._generator_network(muSamples, logQ)
# Compute gradients
muELBOGrads = tf.gradients(tf.reduce_sum(muELBO),
[ muSamples[i]['activation'] for
i in xrange(self.hparams.n_layer) ])
# Compute MuProp gradient estimates
learning_signal = hardELBO
optimizerLoss = 0.0
learning_signals = []
for i in xrange(self.hparams.n_layer):
dfDiff = tf.reduce_sum(
muELBOGrads[i] * (hardSamples[i]['activation'] -
muSamples[i]['activation']),
axis=1)
dfMu = tf.reduce_sum(
tf.stop_gradient(muELBOGrads[i]) *
tf.nn.sigmoid(hardSamples[i]['log_param']),
axis=1)
scaling_baseline_0 = self._create_eta(collection='BASELINE')
scaling_baseline_1 = self._create_eta(collection='BASELINE')
learning_signals.append(learning_signal - scaling_baseline_0 * muELBO - scaling_baseline_1 * dfDiff - self._create_baseline())
self.baseline_loss.append(tf.square(learning_signals[i]))
optimizerLoss += (
logQHard[i] * tf.stop_gradient(learning_signals[i]) +
tf.stop_gradient(scaling_baseline_1) * dfMu)
optimizerLoss += reinforce_model_grad
optimizerLoss *= -1
optimizerLoss = tf.reduce_mean(optimizerLoss)
muprop_gradient = self.optimizer_class.compute_gradients(optimizerLoss)
debug = {
'ELBO': hardELBO,
'muELBO': muELBO,
}
debug.update(dict([
('RMS learning signal layer %d' % i, U.rms(learning_signal))
for (i, learning_signal) in enumerate(learning_signals)]))
return muprop_gradient, debug
def batch_norm(input_,
dim,
name,
scale=True,
train=True,
epsilon=1e-8,
decay=.1,
axes=[0],
bn_lag=DEFAULT_BN_LAG):
"""Batch normalization."""
# create variables
with tf.variable_scope(name):
var = variable_on_cpu(
"var", [dim], tf.constant_initializer(1.), trainable=False)
mean = variable_on_cpu(
"mean", [dim], tf.constant_initializer(0.), trainable=False)
step = variable_on_cpu("step", [], tf.constant_initializer(0.), trainable=False)
if scale:
gamma = variable_on_cpu("gamma", [dim], tf.constant_initializer(1.))
beta = variable_on_cpu("beta", [dim], tf.constant_initializer(0.))
# choose the appropriate moments
if train:
used_mean, used_var = tf.nn.moments(input_, axes, name="batch_norm")
cur_mean, cur_var = used_mean, used_var
if bn_lag > 0.:
used_mean -= (1. - bn_lag) * (used_mean - tf.stop_gradient(mean))
used_var -= (1 - bn_lag) * (used_var - tf.stop_gradient(var))
used_mean /= (1. - bn_lag**(step + 1))
used_var /= (1. - bn_lag**(step + 1))
else:
used_mean, used_var = mean, var
cur_mean, cur_var = used_mean, used_var
# normalize
res = (input_ - used_mean) / tf.sqrt(used_var + epsilon)
# de-normalize
if scale:
res *= gamma
res += beta
# update variables
if train:
with tf.name_scope(name, "AssignMovingAvg", [mean, cur_mean, decay]):
with ops.colocate_with(mean):
new_mean = tf.assign_sub(
mean,
tf.check_numerics(decay * (mean - cur_mean), "NaN in moving mean."))
with tf.name_scope(name, "AssignMovingAvg", [var, cur_var, decay]):
with ops.colocate_with(var):
new_var = tf.assign_sub(
var,
tf.check_numerics(decay * (var - cur_var),
"NaN in moving variance."))
with tf.name_scope(name, "IncrementTime", [step]):
with ops.colocate_with(step):
new_step = tf.assign_add(step, 1.)
res += 0. * new_mean * new_var * new_step
return res
def __init__(self,
q_t,
q_tp1,
q_tp0,
importance_weights,
rewards,
done_mask,
twin_q_t,
twin_q_tp1,
actor_loss_coeff=0.1,
critic_loss_coeff=1.0,
gamma=0.99,
n_step=1,
use_huber=False,
huber_threshold=1.0,
twin_q=False,
policy_delay=1):
q_t_selected = tf.squeeze(q_t, axis=len(q_t.shape) - 1)
if twin_q:
twin_q_t_selected = tf.squeeze(twin_q_t, axis=len(q_t.shape) - 1)
q_tp1 = tf.minimum(q_tp1, twin_q_tp1)
q_tp1_best = tf.squeeze(input=q_tp1, axis=len(q_tp1.shape) - 1)
q_tp1_best_masked = (1.0 - done_mask) * q_tp1_best
# compute RHS of bellman equation
q_t_selected_target = rewards + gamma**n_step * q_tp1_best_masked
# compute the error (potentially clipped)
if twin_q:
td_error = q_t_selected - tf.stop_gradient(q_t_selected_target)
twin_td_error = twin_q_t_selected - tf.stop_gradient(
q_t_selected_target)
self.td_error = td_error + twin_td_error
if use_huber:
errors = _huber_loss(td_error, huber_threshold) + _huber_loss(
twin_td_error, huber_threshold)
else:
errors = 0.5 * tf.square(td_error) + 0.5 * tf.square(
twin_td_error)
else:
self.td_error = (
q_t_selected - tf.stop_gradient(q_t_selected_target))
if use_huber:
errors = _huber_loss(self.td_error, huber_threshold)
else:
errors = 0.5 * tf.square(self.td_error)
self.critic_loss = critic_loss_coeff * tf.reduce_mean(
importance_weights * errors)
# for policy gradient, update policy net one time v.s.
# update critic net `policy_delay` time(s)
global_step = tf.train.get_or_create_global_step()
policy_delay_mask = tf.to_float(
tf.equal(tf.mod(global_step, policy_delay), 0))
self.actor_loss = (-1.0 * actor_loss_coeff * policy_delay_mask *
tf.reduce_mean(q_tp0))
def build_score_loss_and_gradients(inference, var_list):
"""Build loss function and gradients based on the score function
estimator (Paisley et al., 2012).
Computed by sampling from $q(z;\lambda)$ and evaluating the
expectation using Monte Carlo sampling.
"""
p_log_prob = [0.0] * inference.n_samples
q_log_prob = [0.0] * inference.n_samples
for s in range(inference.n_samples):
# Form dictionary in order to replace conditioning on prior or
# observed variable with conditioning on a specific value.
scope = 'inference_' + str(id(inference)) + '/' + str(s)
dict_swap = {}
for x, qx in six.iteritems(inference.data):
if isinstance(x, RandomVariable):
if isinstance(qx, RandomVariable):
qx_copy = copy(qx, scope=scope)
dict_swap[x] = qx_copy.value()
else:
dict_swap[x] = qx
for z, qz in six.iteritems(inference.latent_vars):
# Copy q(z) to obtain new set of posterior samples.
qz_copy = copy(qz, scope=scope)
dict_swap[z] = qz_copy.value()
q_log_prob[s] += tf.reduce_sum(
inference.scale.get(z, 1.0) *
qz_copy.log_prob(tf.stop_gradient(dict_swap[z])))
for z in six.iterkeys(inference.latent_vars):
z_copy = copy(z, dict_swap, scope=scope)
p_log_prob[s] += tf.reduce_sum(
inference.scale.get(z, 1.0) * z_copy.log_prob(dict_swap[z]))
for x in six.iterkeys(inference.data):
if isinstance(x, RandomVariable):
x_copy = copy(x, dict_swap, scope=scope)
p_log_prob[s] += tf.reduce_sum(
inference.scale.get(x, 1.0) * x_copy.log_prob(dict_swap[x]))
p_log_prob = tf.stack(p_log_prob)
q_log_prob = tf.stack(q_log_prob)
if inference.logging:
summary_key = 'summaries_' + str(id(inference))
tf.summary.scalar("loss/p_log_prob", tf.reduce_mean(p_log_prob),
collections=[summary_key])
tf.summary.scalar("loss/q_log_prob", tf.reduce_mean(q_log_prob),
collections=[summary_key])
losses = p_log_prob - q_log_prob
loss = -tf.reduce_mean(losses)
grads = tf.gradients(
-tf.reduce_mean(q_log_prob * tf.stop_gradient(losses)),
var_list)
grads_and_vars = list(zip(grads, var_list))
return loss, grads_and_vars
def kmeans(x, means, hparams, name):
with tf.variable_scope(name):
x_means_hot = nearest(x, means, hparams)
x_means = tf.gather(means, tf.argmax(x_means_hot, axis=-1))
reg_loss1 = tf.nn.l2_loss((tf.stop_gradient(x) - x_means))
reg_loss2 = hparams.beta * tf.nn.l2_loss((x - tf.stop_gradient(x_means)))
l = reg_loss1 + reg_loss2
return x_means_hot, x_means, l
def build_score_kl_loss_and_gradients(inference, var_list):
"""Build loss function and gradients based on the score function
estimator (Paisley et al., 2012).
It assumes the KL is analytic.
Computed by sampling from $q(z;\lambda)$ and evaluating the
expectation using Monte Carlo sampling.
"""
p_log_lik = [0.0] * inference.n_samples
q_log_prob = [0.0] * inference.n_samples
base_scope = tf.get_default_graph().unique_name("inference") + '/'
for s in range(inference.n_samples):
# Form dictionary in order to replace conditioning on prior or
# observed variable with conditioning on a specific value.
scope = base_scope + tf.get_default_graph().unique_name("sample")
dict_swap = {}
for x, qx in six.iteritems(inference.data):
if isinstance(x, RandomVariable):
if isinstance(qx, RandomVariable):
qx_copy = copy(qx, scope=scope)
dict_swap[x] = qx_copy.value()
else:
dict_swap[x] = qx
for z, qz in six.iteritems(inference.latent_vars):
# Copy q(z) to obtain new set of posterior samples.
qz_copy = copy(qz, scope=scope)
dict_swap[z] = qz_copy.value()
q_log_prob[s] += tf.reduce_sum(
inference.scale.get(z, 1.0) *
qz_copy.log_prob(tf.stop_gradient(dict_swap[z])))
for x in six.iterkeys(inference.data):
if isinstance(x, RandomVariable):
x_copy = copy(x, dict_swap, scope=scope)
p_log_lik[s] += tf.reduce_sum(
inference.scale.get(x, 1.0) * x_copy.log_prob(dict_swap[x]))
p_log_lik = tf.stack(p_log_lik)
q_log_prob = tf.stack(q_log_prob)
kl_penalty = tf.reduce_sum([
inference.kl_scaling.get(z, 1.0) * tf.reduce_sum(kl_divergence(qz, z))
for z, qz in six.iteritems(inference.latent_vars)])
if inference.logging:
tf.summary.scalar("loss/p_log_lik", tf.reduce_mean(p_log_lik),
collections=[inference._summary_key])
tf.summary.scalar("loss/kl_penalty", kl_penalty,
collections=[inference._summary_key])
loss = -(tf.reduce_mean(p_log_lik) - kl_penalty)
grads = tf.gradients(
-(tf.reduce_mean(q_log_prob * tf.stop_gradient(p_log_lik)) - kl_penalty),
var_list)
grads_and_vars = list(zip(grads, var_list))
return loss, grads_and_vars
def __init__(self, env):
self.env = env
if not isinstance(env.observation_space, Box) or \
not isinstance(env.action_space, Discrete):
print("Incompatible spaces.")
exit(-1)
print("Observation Space", env.observation_space)
print("Action Space", env.action_space)
self.session = tf.Session()
self.end_count = 0
self.train = True
self.obs = obs = tf.placeholder(
dtype, shape=[
None, 2 * env.observation_space.shape[0] + env.action_space.n], name="obs")
self.prev_obs = np.zeros((1, env.observation_space.shape[0]))
self.prev_action = np.zeros((1, env.action_space.n))
self.action = action = tf.placeholder(tf.int64, shape=[None], name="action")
self.advant = advant = tf.placeholder(dtype, shape=[None], name="advant")
self.oldaction_dist = oldaction_dist = tf.placeholder(dtype, shape=[None, env.action_space.n], name="oldaction_dist")
# Create neural network.
action_dist_n, _ = (pt.wrap(self.obs).
fully_connected(64, activation_fn=tf.nn.tanh).
softmax_classifier(env.action_space.n))
eps = 1e-6
self.action_dist_n = action_dist_n
N = tf.shape(obs)[0]
p_n = slice_2d(action_dist_n, tf.range(0, N), action)
oldp_n = slice_2d(oldaction_dist, tf.range(0, N), action)
ratio_n = p_n / oldp_n
Nf = tf.cast(N, dtype)
surr = -tf.reduce_mean(ratio_n * advant) # Surrogate loss
var_list = tf.trainable_variables()
kl = tf.reduce_sum(oldaction_dist * tf.log((oldaction_dist + eps) / (action_dist_n + eps))) / Nf
ent = tf.reduce_sum(-action_dist_n * tf.log(action_dist_n + eps)) / Nf
self.losses = [surr, kl, ent]
self.pg = flatgrad(surr, var_list)
# KL divergence where first arg is fixed
# replace old->tf.stop_gradient from previous kl
kl_firstfixed = tf.reduce_sum(tf.stop_gradient(
action_dist_n) * tf.log(tf.stop_gradient(action_dist_n + eps) / (action_dist_n + eps))) / Nf
grads = tf.gradients(kl_firstfixed, var_list)
self.flat_tangent = tf.placeholder(dtype, shape=[None])
shapes = map(var_shape, var_list)
start = 0
tangents = []
for shape in shapes:
size = np.prod(shape)
param = tf.reshape(self.flat_tangent[start:(start + size)], shape)
tangents.append(param)
start += size
gvp = [tf.reduce_sum(g * t) for (g, t) in zip(grads, tangents)]
self.fvp = flatgrad(gvp, var_list)
self.gf = GetFlat(self.session, var_list)
self.sff = SetFromFlat(self.session, var_list)
self.vf = VF(self.session)
self.session.run(tf.initialize_all_variables())
def BatchRenorm(x, rmax, dmax, decay=0.9, epsilon=1e-5,
use_scale=True, use_bias=True):
"""
Batch Renormalization layer, as described in the paper:
`Batch Renormalization: Towards Reducing Minibatch Dependence in Batch-Normalized Models
<https://arxiv.org/abs/1702.03275>`_.
Args:
x (tf.Tensor): a NHWC or NC tensor.
rmax, dmax (tf.Tensor): a scalar tensor, the maximum allowed corrections.
decay (float): decay rate of moving average.
epsilon (float): epsilon to avoid divide-by-zero.
use_scale, use_bias (bool): whether to use the extra affine transformation or not.
Returns:
tf.Tensor: a tensor named ``output`` with the same shape of x.
Variable Names:
* ``beta``: the bias term.
* ``gamma``: the scale term. Input will be transformed by ``x * gamma + beta``.
* ``mean/EMA``: the moving average of mean.
* ``variance/EMA``: the moving average of variance.
"""
shape = x.get_shape().as_list()
assert len(shape) in [2, 4]
n_out = shape[-1]
if len(shape) == 2:
x = tf.reshape(x, [-1, 1, 1, n_out])
beta, gamma, moving_mean, moving_var = get_bn_variables(
n_out, use_scale, use_bias, tf.constant_initializer(1.0))
ctx = get_current_tower_context()
use_local_stat = ctx.is_training
# for BatchRenorm, use_local_stat should always be is_training, unless a
# different usage comes out in the future.
if use_local_stat:
xn, batch_mean, batch_var = tf.nn.fused_batch_norm(x, gamma, beta,
epsilon=epsilon, is_training=True)
inv_sigma = tf.rsqrt(moving_var, 'inv_sigma')
r = tf.stop_gradient(tf.clip_by_value(
tf.sqrt(batch_var) * inv_sigma, 1.0 / rmax, rmax))
d = tf.stop_gradient(tf.clip_by_value(
(batch_mean - moving_mean) * inv_sigma,
-dmax, dmax))
xn = xn * r + d
else:
xn = tf.nn.batch_normalization(
x, moving_mean, moving_var, beta, gamma, epsilon)
if len(shape) == 2:
xn = tf.squeeze(xn, [1, 2])
if ctx.is_main_training_tower:
return update_bn_ema(xn, batch_mean, batch_var, moving_mean, moving_var, decay)
else:
return tf.identity(xn, name='output')
def sample_fast_rcnn_targets(boxes, gt_boxes, gt_labels):
"""
Sample some ROIs from all proposals for training.
#fg is guaranteed to be > 0, because grount truth boxes are added as RoIs.
Args:
boxes: nx4 region proposals, floatbox
gt_boxes: mx4, floatbox
gt_labels: m, int32
Returns:
sampled_boxes: tx4 floatbox, the rois
sampled_labels: t labels, in [0, #class-1]. Positive means foreground.
fg_inds_wrt_gt: #fg indices, each in range [0, m-1].
It contains the matching GT of each foreground roi.
"""
iou = pairwise_iou(boxes, gt_boxes) # nxm
proposal_metrics(iou)
# add ground truth as proposals as well
boxes = tf.concat([boxes, gt_boxes], axis=0) # (n+m) x 4
iou = tf.concat([iou, tf.eye(tf.shape(gt_boxes)[0])], axis=0) # (n+m) x m
# #proposal=n+m from now on
def sample_fg_bg(iou):
fg_mask = tf.reduce_max(iou, axis=1) >= cfg.FRCNN.FG_THRESH
fg_inds = tf.reshape(tf.where(fg_mask), [-1])
num_fg = tf.minimum(int(
cfg.FRCNN.BATCH_PER_IM * cfg.FRCNN.FG_RATIO),
tf.size(fg_inds), name='num_fg')
fg_inds = tf.random_shuffle(fg_inds)[:num_fg]
bg_inds = tf.reshape(tf.where(tf.logical_not(fg_mask)), [-1])
num_bg = tf.minimum(
cfg.FRCNN.BATCH_PER_IM - num_fg,
tf.size(bg_inds), name='num_bg')
bg_inds = tf.random_shuffle(bg_inds)[:num_bg]
add_moving_summary(num_fg, num_bg)
return fg_inds, bg_inds
fg_inds, bg_inds = sample_fg_bg(iou)
# fg,bg indices w.r.t proposals
best_iou_ind = tf.argmax(iou, axis=1) # #proposal, each in 0~m-1
fg_inds_wrt_gt = tf.gather(best_iou_ind, fg_inds) # num_fg
all_indices = tf.concat([fg_inds, bg_inds], axis=0) # indices w.r.t all n+m proposal boxes
ret_boxes = tf.gather(boxes, all_indices)
ret_labels = tf.concat(
[tf.gather(gt_labels, fg_inds_wrt_gt),
tf.zeros_like(bg_inds, dtype=tf.int64)], axis=0)
# stop the gradient -- they are meant to be training targets
return tf.stop_gradient(ret_boxes, name='sampled_proposal_boxes'), \
tf.stop_gradient(ret_labels, name='sampled_labels'), \
tf.stop_gradient(fg_inds_wrt_gt)
def __call__(self, batch_size, **kwargs):
"""Sample a batch of context.
Args:
batch_size: Batch size.
Returns:
Two [batch_size, num_context_dims] tensors.
"""
spec = self._context_spec
context_range = self._context_range
if isinstance(context_range[0], (int, float)):
contexts = tf.random_uniform(
shape=[
batch_size,
] + spec.shape.as_list(),
minval=context_range[0],
maxval=context_range[1],
dtype=spec.dtype)
elif isinstance(context_range[0], (list, tuple, np.ndarray)):
assert len(spec.shape.as_list()) == 1
assert spec.shape.as_list()[0] == len(context_range[0])
assert spec.shape.as_list()[0] == len(context_range[1])
contexts = tf.concat(
[
tf.random_uniform(
shape=[
batch_size, 1,
] + spec.shape.as_list()[1:],
minval=context_range[0][i],
maxval=context_range[1][i],
dtype=spec.dtype) for i in range(spec.shape.as_list()[0])
],
axis=1)
else: raise NotImplementedError(context_range)
self._validate_contexts(contexts)
if 'sampler_fn' in kwargs:
other_contexts = kwargs['sampler_fn']()
else:
other_contexts = contexts
state, next_state = kwargs['state'], kwargs['next_state']
if state is not None and next_state is not None:
my_context_range = (np.array(context_range[1]) - np.array(context_range[0])) / 2 * np.ones(spec.shape.as_list())
contexts = tf.concat(
[0.1 * my_context_range[:self._k] *
tf.random_normal(tf.shape(state[:, :self._k]), dtype=state.dtype) +
tf.random_shuffle(state[:, :self._k]) - state[:, :self._k],
other_contexts[:, self._k:]], 1)
#contexts = tf.Print(contexts,
# [contexts, tf.reduce_max(contexts, 0),
# tf.reduce_min(state, 0), tf.reduce_max(state, 0)], 'contexts', summarize=15)
next_contexts = tf.concat( #LALA
[state[:, :self._k] + contexts[:, :self._k] - next_state[:, :self._k],
other_contexts[:, self._k:]], 1)
next_contexts = contexts #LALA cosine
else:
next_contexts = contexts
return tf.stop_gradient(contexts), tf.stop_gradient(next_contexts)
def generate_fpn_proposals(
multilevel_anchors, multilevel_label_logits,
multilevel_box_logits, image_shape2d):
"""
Args:
multilevel_anchors: #lvl RPNAnchors
multilevel_label_logits: #lvl tensors of shape HxWxA
multilevel_box_logits: #lvl tensors of shape HxWxAx4
Returns:
boxes: kx4 float
scores: k logits
"""
num_lvl = len(cfg.FPN.ANCHOR_STRIDES)
assert len(multilevel_anchors) == num_lvl
assert len(multilevel_label_logits) == num_lvl
assert len(multilevel_box_logits) == num_lvl
ctx = get_current_tower_context()
all_boxes = []
all_scores = []
if cfg.FPN.PROPOSAL_MODE == 'Level':
fpn_nms_topk = cfg.RPN.TRAIN_PER_LEVEL_NMS_TOPK if ctx.is_training else cfg.RPN.TEST_PER_LEVEL_NMS_TOPK
for lvl in range(num_lvl):
with tf.name_scope('Lvl{}'.format(lvl + 2)):
anchors = multilevel_anchors[lvl]
pred_boxes_decoded = anchors.decode_logits(multilevel_box_logits[lvl])
proposal_boxes, proposal_scores = generate_rpn_proposals(
tf.reshape(pred_boxes_decoded, [-1, 4]),
tf.reshape(multilevel_label_logits[lvl], [-1]),
image_shape2d, fpn_nms_topk)
all_boxes.append(proposal_boxes)
all_scores.append(proposal_scores)
proposal_boxes = tf.concat(all_boxes, axis=0) # nx4
proposal_scores = tf.concat(all_scores, axis=0) # n
proposal_topk = tf.minimum(tf.size(proposal_scores), fpn_nms_topk)
proposal_scores, topk_indices = tf.nn.top_k(proposal_scores, k=proposal_topk, sorted=False)
proposal_boxes = tf.gather(proposal_boxes, topk_indices)
else:
for lvl in range(num_lvl):
with tf.name_scope('Lvl{}'.format(lvl + 2)):
anchors = multilevel_anchors[lvl]
pred_boxes_decoded = anchors.decode_logits(multilevel_box_logits[lvl])
all_boxes.append(tf.reshape(pred_boxes_decoded, [-1, 4]))
all_scores.append(tf.reshape(multilevel_label_logits[lvl], [-1]))
all_boxes = tf.concat(all_boxes, axis=0)
all_scores = tf.concat(all_scores, axis=0)
proposal_boxes, proposal_scores = generate_rpn_proposals(
all_boxes, all_scores, image_shape2d,
cfg.RPN.TRAIN_PRE_NMS_TOPK if ctx.is_training else cfg.RPN.TEST_PRE_NMS_TOPK,
cfg.RPN.TRAIN_POST_NMS_TOPK if ctx.is_training else cfg.RPN.TEST_POST_NMS_TOPK)
tf.sigmoid(proposal_scores, name='probs') # for visualization
return tf.stop_gradient(proposal_boxes, name='boxes'), \
tf.stop_gradient(proposal_scores, name='scores')
def batch_norm_log_diff(input_,
dim,
name,
train=True,
epsilon=1e-8,
decay=.1,
axes=[0],
reuse=None,
bn_lag=DEFAULT_BN_LAG):
"""Batch normalization with corresponding log determinant Jacobian."""
if reuse is None:
reuse = not train
# create variables
with tf.variable_scope(name) as scope:
if reuse:
scope.reuse_variables()
var = variable_on_cpu(
"var", [dim], tf.constant_initializer(1.), trainable=False)
mean = variable_on_cpu(
"mean", [dim], tf.constant_initializer(0.), trainable=False)
step = variable_on_cpu("step", [], tf.constant_initializer(0.), trainable=False)
# choose the appropriate moments
if train:
used_mean, used_var = tf.nn.moments(input_, axes, name="batch_norm")
cur_mean, cur_var = used_mean, used_var
if bn_lag > 0.:
used_var = stable_var(input_=input_, mean=used_mean, axes=axes)
cur_var = used_var
used_mean -= (1 - bn_lag) * (used_mean - tf.stop_gradient(mean))
used_mean /= (1. - bn_lag**(step + 1))
used_var -= (1 - bn_lag) * (used_var - tf.stop_gradient(var))
used_var /= (1. - bn_lag**(step + 1))
else:
used_mean, used_var = mean, var
cur_mean, cur_var = used_mean, used_var
# update variables
if train:
with tf.name_scope(name, "AssignMovingAvg", [mean, cur_mean, decay]):
with ops.colocate_with(mean):
new_mean = tf.assign_sub(
mean,
tf.check_numerics(
decay * (mean - cur_mean), "NaN in moving mean."))
with tf.name_scope(name, "AssignMovingAvg", [var, cur_var, decay]):
with ops.colocate_with(var):
new_var = tf.assign_sub(
var,
tf.check_numerics(decay * (var - cur_var),
"NaN in moving variance."))
with tf.name_scope(name, "IncrementTime", [step]):
with ops.colocate_with(step):
new_step = tf.assign_add(step, 1.)
used_var += 0. * new_mean * new_var * new_step
used_var += epsilon
return used_mean, used_var
def compute_loss():
labelsf = tf.cast(labels, logits.dtype)
signs = 2. * labelsf - 1.
errors = 1. - logits * tf.stop_gradient(signs)
errors_sorted, perm = tf.nn.top_k(errors, k=tf.shape(errors)[0], name="descending_sort")
gt_sorted = tf.gather(labelsf, perm)
grad = lovasz_grad(gt_sorted)
loss = tf.tensordot(tf.nn.relu(errors_sorted), tf.stop_gradient(grad), 1, name="loss_non_void")
return loss
def _build_net(self):
# ------------------ inputs ---------------------
self.s = tf.placeholder(tf.float32, [None, self.n_features],
name='s') # input State
self.s_ = tf.placeholder(tf.float32, [None, self.n_features],
name='s_') # input Next State
self.r = tf.placeholder(tf.float32, [
None,
], name='r') # input Reward
self.a = tf.placeholder(tf.int32, [
None,
], name='a') # input Action
w_initializer, b_initializer = tf.random_normal_initializer(
0., 0.3), tf.constant_initializer(0.1)
# ------------------ evaluation_net --------------
with tf.variable_scope('eval_net'):
e1 = tf.layers.dense(self.s,
FIRSTLAYER_SIZE,
tf.nn.relu,
kernel_initializer=w_initializer,
bias_initializer=b_initializer,
name='e1')
self.q_eval = tf.layers.dense(e1,
self.n_actions,
kernel_initializer=w_initializer,
bias_initializer=b_initializer,
name='q')
# ------------------ target_net ------------------
with tf.variable_scope('target_net'):
t1 = tf.layers.dense(self.s_,
FIRSTLAYER_SIZE,
tf.nn.relu,
kernel_initializer=w_initializer,
bias_initializer=b_initializer,
name='t1')
self.q_next = tf.layers.dense(t1,
self.n_actions,
kernel_initializer=w_initializer,
bias_initializer=b_initializer,
name='t2')
with tf.variable_scope('q_target'):
q_target = self.r + self.gamma * tf.reduce_max(
self.q_next, axis=1, name='Qmax_s_') # shape=(None, )
self.q_target = tf.stop_gradient(q_target)
with tf.variable_scope('q_eval'):
a_indices = tf.stack(
[tf.range(tf.shape(self.a)[0], dtype=tf.int32), self.a],
axis=1)
self.q_eval_wrt_a = tf.gather_nd(
params=self.q_eval, indices=a_indices) # shape=(None, )
with tf.variable_scope('loss'):
self.loss = tf.reduce_mean(
tf.squared_difference(self.q_target,
self.q_eval_wrt_a,
name='TD_error'))
with tf.variable_scope('train'):
self._train_op = tf.train.AdamOptimizer(self.lr).minimize(
self.loss)
features = tf.placeholder(tf.float32 , (None , 32,32,3)) labels = tf.placeholder(tf.init64 , None) resized = tf.image.resize_images(features , (227 , 227)) # Returns the second final layer of the AlexNet model, # this allows us to redo the last layer for the traffic signs # model. fc7 = AlexNet(resized , feature_extract = True) fc7 = tf.stop_gradient(fc7) shape= (fc7.get_shape().as_list[-1] , nb_classes) # designing the new fully connected layer : fc8W = tf.Variable(tf.truncated_normal(shape, stddev = 1e-2)) fc8b = tf.varibale(tf.zeros(nb_classes)) logits = tf.matmul(fc7 , fc8W) + fc8b cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits loss_op = tf.reduce_mean(cross_entropy) opt = tf.train.AdamOptimizer() train_op =opt.minimize(loss_op , var_list= [fc8W , fc8b])
def _init_actor_update(self):
"""Create minimization operations for policy and entropy.
Creates a `tf.optimizer.minimize` operations for updating
policy and entropy with gradient descent, and adds them to
`self._training_ops` attribute.
See Section 4.2 in [1], for further information of the policy update,
and Section 5 in [1] for further information of the entropy update.
"""
actions = self._policy.actions([self._observations_ph])
log_pis = self._policy.log_pis([self._observations_ph], actions)
assert log_pis.shape.as_list() == [None, 1]
log_alpha = self._log_alpha = tf.get_variable('log_alpha',
dtype=tf.float32,
initializer=0.0)
alpha = tf.exp(log_alpha)
if isinstance(self._target_entropy, Number):
alpha_loss = -tf.reduce_mean(
log_alpha * tf.stop_gradient(log_pis + self._target_entropy))
self._alpha_optimizer = tf.train.AdamOptimizer(
self._policy_lr, name='alpha_optimizer')
self._alpha_train_op = self._alpha_optimizer.minimize(
loss=alpha_loss, var_list=[log_alpha])
self._training_ops.update(
{'temperature_alpha': self._alpha_train_op})
self._alpha = alpha
if self._action_prior == 'normal':
policy_prior = tfp.distributions.MultivariateNormalDiag(
loc=tf.zeros(self._action_shape),
scale_diag=tf.ones(self._action_shape))
policy_prior_log_probs = policy_prior.log_prob(actions)
elif self._action_prior == 'uniform':
policy_prior_log_probs = 0.0
Q_log_targets = tuple(
Q([self._observations_ph, actions]) for Q in self._Qs)
min_Q_log_target = tf.reduce_min(Q_log_targets, axis=0)
if self._reparameterize:
policy_kl_losses = (alpha * log_pis - min_Q_log_target -
policy_prior_log_probs)
else:
raise NotImplementedError
assert policy_kl_losses.shape.as_list() == [None, 1]
self._policy_losses = policy_kl_losses
policy_loss = tf.reduce_mean(policy_kl_losses)
self._policy_optimizer = tf.train.AdamOptimizer(
learning_rate=self._policy_lr, name="policy_optimizer")
policy_train_op = self._policy_optimizer.minimize(
loss=policy_loss, var_list=self._policy.trainable_variables)
self._training_ops.update({'policy_train_op': policy_train_op})
def asac(env_fn,
actor_critic=core.mlp_actor_critic,
ac_kwargs=dict(),
seed=0,
steps_per_epoch=5000,
epochs=200,
replay_size=int(1e6),
gamma=0.99,
polyak=0.995,
lr=5e-4,
alpha_start=0.2,
batch_size=100,
start_steps=10000,
max_ep_len=1000,
logger_kwargs=dict(),
save_freq=1,
loss_threshold=0.0001,
delta=0.02,
sample_step=2000):
alpha = Alpha(alpha_start=alpha_start, delta=delta)
alpha_t = alpha()
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
tf.set_random_seed(seed)
np.random.seed(seed)
env, test_env = env_fn(), env_fn()
obs_dim = env.observation_space.shape[0]
act_dim = env.action_space.shape[0]
# Action limit for clamping: critically, assumes all dimensions share the same bound!
act_limit = env.action_space.high[0]
# Share information about action space with policy architecture
ac_kwargs['action_space'] = env.action_space
# Inputs to computation graph
#x_ph, a_ph, x2_ph, r_ph, d_ph, ret_ph = core.placeholders(obs_dim, act_dim, obs_dim, None, None, None)
x_ph, a_ph, x2_ph, r_ph, d_ph = core.placeholders(obs_dim, act_dim,
obs_dim, None, None)
alpha_ph = core.scale_holder()
# Main outputs from computation graph
#R, R_next = return_estimate(x_ph, x2_ph, **ac_kwargs)
with tf.variable_scope('main'):
mu, pi, logp_pi, q1, q2, q1_pi, q2_pi, v, Q, Q_pi, R = actor_critic(
x_ph, a_ph, **ac_kwargs)
# Target value network
with tf.variable_scope('target'):
_, _, _, _, _, _, _, v_targ, _, _, R_targ = actor_critic(
x2_ph, a_ph, **ac_kwargs)
# Experience buffer
replay_buffer = ReplayBuffer(obs_dim=obs_dim,
act_dim=act_dim,
size=replay_size)
# Count variables
var_counts = tuple(
core.count_vars(scope) for scope in [
'main/pi', 'main/q1', 'main/q2', 'main/v', 'main/Q', 'main/R',
'main'
])
print(('\nNumber of parameters: \t pi: %d, \t' + \
'q1: %d, \t q2: %d, \t v: %d, \t Q: %d, \t R: %d, \t total: %d\n')%var_counts)
# Min Double-Q:
min_q_pi = tf.minimum(q1_pi, q2_pi)
# Targets for Q and V regression
q_backup = tf.stop_gradient(r_ph + gamma * (1 - d_ph) * v_targ)
v_backup = tf.stop_gradient(min_q_pi - alpha_ph * logp_pi)
Q_backup = tf.stop_gradient(r_ph + gamma * (1 - d_ph) * R_targ)
R_backup = tf.stop_gradient(Q_pi)
adv = Q_pi - R
pi_loss = tf.reduce_mean(alpha_ph * logp_pi - q1_pi)
q1_loss = 0.5 * tf.reduce_mean((q_backup - q1)**2)
q2_loss = 0.5 * tf.reduce_mean((q_backup - q2)**2)
v_loss = 0.5 * tf.reduce_mean((v_backup - v)**2)
Q_loss = 0.5 * tf.reduce_mean((Q_backup - Q)**2)
R_loss = 0.5 * tf.reduce_mean((R_backup - R)**2)
value_loss = q1_loss + q2_loss + v_loss + Q_loss + R_loss
# Policy train op
# (has to be separate from value train op, because q1_pi appears in pi_loss)
pi_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
train_pi_op = pi_optimizer.minimize(pi_loss, var_list=get_vars('main/pi'))
# Value train op
# (control dep of train_pi_op because sess.run otherwise evaluates in nondeterministic order)
value_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
value_params = get_vars('main/q') + get_vars('main/v') + get_vars(
'main/Q') + get_vars('main/R')
with tf.control_dependencies([train_pi_op]):
train_value_op = value_optimizer.minimize(value_loss,
var_list=value_params)
"""
R_optimizer = tf.train.AdamOptimizer(learning_rate=lr)
train_R_op = R_optimizer.minimize(R_loss, var_list=get_vars('R'))
"""
# Polyak averaging for target variables
# (control flow because sess.run otherwise evaluates in nondeterministic order)
with tf.control_dependencies([train_value_op]):
target_update = tf.group([
tf.assign(v_targ, polyak * v_targ + (1 - polyak) * v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
# All ops to call during one training step
step_ops = [
pi_loss, q1_loss, q2_loss, v_loss, q1, q2, v, logp_pi, train_pi_op,
train_value_op, target_update, R_loss, Q_loss
]
# Initializing targets to match main variables
target_init = tf.group([
tf.assign(v_targ, v_main)
for v_main, v_targ in zip(get_vars('main'), get_vars('target'))
])
config = tf.ConfigProto(inter_op_parallelism_threads=30,
intra_op_parallelism_threads=5)
config.gpu_options.allow_growth = True
sess = tf.Session(config=config)
sess.run(tf.global_variables_initializer())
sess.run(target_init)
# Setup model saving
logger.setup_tf_saver(sess,
inputs={
'x': x_ph,
'a': a_ph
},
outputs={
'mu': mu,
'pi': pi,
'q1': q1,
'q2': q2,
'v': v,
'Q': Q,
'R': R
})
def get_action(o, deterministic=False):
act_op = mu if deterministic else pi
return sess.run(act_op, feed_dict={x_ph: o.reshape(1, -1)})
def test_agent(n=10):
global sess, mu, pi, q1, q2, q1_pi, q2_pi
for j in range(n):
o, r, d, ep_ret, ep_len = test_env.reset(), 0, False, 0, 0
while not (d or (ep_len == max_ep_len)):
# Take deterministic actions at test time
o, r, d, _ = test_env.step(get_action(o, True))
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
start_time = time.time()
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
ret_est = sess.run(R, feed_dict={x_ph: [o]})[0]
total_steps = steps_per_epoch * epochs
counter = 0
ret_epi = []
obs_epi = []
loss_old = 10000
# Main loop: collect experience in env and update/log each epoch
for t in range(total_steps):
"""
Until start_steps have elapsed, randomly sample actions
from a uniform distribution for better exploration. Afterwards,
use the learned policy.
"""
if t > start_steps:
a = get_action(o)
else:
a = env.action_space.sample()
# Step the env
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
# Ignore the "done" signal if it comes from hitting the time
# horizon (that is, when it's an artificial terminal signal
# that isn't based on the agent's state)
d = False if ep_len == max_ep_len else d
# Store experience to replay buffer
replay_buffer.store(o, a, r, o2, d)
# Super critical, easy to overlook step: make sure to update
# most recent observation!
o = o2
if d or (ep_len == max_ep_len):
"""
Perform all SAC updates at the end of the trajectory.
This is a slight difference from the SAC specified in the
original paper.
"""
for j in range(ep_len):
batch = replay_buffer.sample_batch(batch_size)
feed_dict = {
x_ph: batch['obs1'],
x2_ph: batch['obs2'],
a_ph: batch['acts'],
r_ph: batch['rews'],
d_ph: batch['done'],
alpha_ph: alpha_t
}
outs = sess.run(step_ops, feed_dict)
logger.store(LossPi=outs[0],
LossQ1=outs[1],
LossQ2=outs[2],
LossV=outs[3],
Q1Vals=outs[4],
Q2Vals=outs[5],
VVals=outs[6],
LogPi=outs[7],
LossR=outs[11])
counter += 1
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
ret_est = sess.run(R, feed_dict={x_ph: [o]})[0]
logger.store(RetEst=ret_est)
if counter >= 1000:
loss_new, _ = logger.get_stats('LossPi')
counter = 0
if (loss_old - loss_new) / np.absolute(
loss_old) < loss_threshold and t > start_steps:
rho_s = np.zeros([sample_step, obs_dim], dtype=np.float32)
rho_ptr = 0
for sample_t in range(sample_step):
a = get_action(o)
o2, r, d, _ = env.step(a)
ep_len += 1
d = False if ep_len == max_ep_len else d
rho_s[rho_ptr] = o
o = o2
if d or (ep_len == max_ep_len):
o, r, d, ep_ret, ep_len = env.reset(
), 0, False, 0, 0
advantages = sess.run(adv, feed_dict={x_ph: rho_s})
alpha.update_alpha(advantages)
#alpha.update_alpha(rho_q-rho_v)
alpha_t = alpha()
print(alpha_t)
o, r, d, ep_ret, ep_len = env.reset(), 0, False, 0, 0
loss_old = 10000
else:
loss_old = loss_new
# End of epoch wrap-up
if t > 0 and t % steps_per_epoch == 0:
epoch = t // steps_per_epoch
# Save model
if (epoch % save_freq == 0) or (epoch == epochs - 1):
logger.save_state({'env': env}, None)
# Test the performance of the deterministic version of the agent.
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EntCoeff', alpha_t)
logger.log_tabular('RetEst', average_only=True)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('Q1Vals', with_min_and_max=True)
logger.log_tabular('Q2Vals', with_min_and_max=True)
logger.log_tabular('VVals', with_min_and_max=True)
logger.log_tabular('LogPi', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ1', average_only=True)
logger.log_tabular('LossQ2', average_only=True)
logger.log_tabular('LossV', average_only=True)
logger.log_tabular('LossR', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger.dump_tabular()
def frequency_encoder(features, kernels, biases):
# Check for valid weights
restore = False
if kernels[0] is not None:
restore = True
# Capture largest frequency dependent features
conv_freq1 = tf.layers.Conv2D(
6, (HEIGHT / 2, 2),
strides=(HEIGHT / 4, 2),
activation='relu',
padding='same',
name='conv1-',
kernel_initializer=kernels.pop(),
kernel_regularizer=tf.contrib.layers.l2_regularizer(BETA / 10),
bias_initializer=biases.pop())(features)
# Capture large frequency dependent features
conv_freq2 = tf.layers.Conv2D(
6, (HEIGHT / 4, 2),
strides=(HEIGHT / 8, 2),
activation='relu',
padding='same',
name='conv2-',
kernel_initializer=kernels.pop(),
kernel_regularizer=tf.contrib.layers.l2_regularizer(BETA / 10),
bias_initializer=biases.pop())(features)
# Capture small frequency dependent features
conv_freq3 = tf.layers.Conv2D(
6, (HEIGHT / 8, 2),
strides=(HEIGHT / 16, 2),
activation='relu',
padding='same',
name='conv3-',
kernel_initializer=kernels.pop(),
kernel_regularizer=tf.contrib.layers.l2_regularizer(BETA / 10),
bias_initializer=biases.pop())(features)
# Capture smallest frequency dependent features
conv_freq4 = tf.layers.Conv2D(
6, (HEIGHT / 21, 2),
strides=(HEIGHT / 42, 2),
activation='relu',
padding='same',
name='conv4-',
kernel_initializer=kernels.pop(),
kernel_regularizer=tf.contrib.layers.l2_regularizer(BETA / 10),
bias_initializer=biases.pop())(features)
# Pool out time scales
pool_freq1 = tf.layers.MaxPooling2D((2, WIDTH / 8), (1, WIDTH / 16),
padding='same',
name='pool5-')(conv_freq1)
pool_freq2 = tf.layers.MaxPooling2D((2, WIDTH / 8), (1, WIDTH / 16),
padding='same',
name='pool6-')(conv_freq2)
pool_freq3 = tf.layers.MaxPooling2D((2, WIDTH / 8), (1, WIDTH / 16),
padding='same',
name='pool7-')(conv_freq3)
pool_freq4 = tf.layers.MaxPooling2D((2, WIDTH / 8), (1, WIDTH / 16),
padding='same',
name='pool8-')(conv_freq4)
'''
# Pad smaller feature maps
pool_freq1 = tf.pad(pool_freq1, tf.constant([[0, 0], [17, 17], [0, 0], [0, 0]]))
pool_freq2 = tf.pad(pool_freq2, tf.constant([[0, 0], [15, 15], [0, 0], [0, 0]]))
pool_freq3 = tf.pad(pool_freq3, tf.constant([[0, 0], [11, 11], [0, 0], [0, 0]]))
# Concat into same feature map
freq_map = tf.concat([pool_freq1, pool_freq2, pool_freq3, pool_freq4], 3)
'''
# Upscale smaller frequency maps
_, height, width, depth = pool_freq4.get_shape()
pool_freq1 = tf.image.resize_nearest_neighbor(pool_freq1, [height, width])
pool_freq2 = tf.image.resize_nearest_neighbor(pool_freq2, [height, width])
pool_freq3 = tf.image.resize_nearest_neighbor(pool_freq3, [height, width])
# Concat into same feature map
freq_map = tf.concat([pool_freq1, pool_freq2, pool_freq3, pool_freq4], 3)
# Post image of feedback map BROKEN
feedback_map = tf.concat([pool_freq1, pool_freq2, pool_freq3, pool_freq4],
2)
feedback_image0 = tf.slice(feedback_map, [0, 0, 0, 0], [-1, -1, -1, 3])
feedback_image1 = tf.slice(feedback_map, [0, 0, 0, 3], [-1, -1, -1, 3])
feedback_image = tf.concat([feedback_image0, feedback_image1], 2)
tf.summary.image("feedback_map", feedback_image, max_outputs=18)
# If valid weights were loaded
if restore:
# Don't update layers
tf.stop_gradient(conv_freq1)
tf.stop_gradient(conv_freq2)
tf.stop_gradient(conv_freq3)
tf.stop_gradient(conv_freq4)
return freq_map
def __init__(self, size_obs, size_act, net_struct = [100, 100, 100, 100], name='dbg'):
self.tensorboardpath = 'tensorboards/' + name
self.train_writer = tf.summary.FileWriter(self.tensorboardpath)
self.ModelPath = 'Models/Imitation' + name
self.mse_train = []
self.mse_val = []
self.last_epoch = 0
size_inpt = 200
self.obs = tf.placeholder(tf.float32, shape=(None, size_obs))
self.ret = tf.placeholder(tf.float32, shape=(None))
act_trn = self.obs
act_tst = self.obs
prev_layer_size = size_obs
#Hidden layers
self.l2_reg = 1e-8
self.Q_lr = tf.placeholder(tf.float32, shape=(None))
self.lr = tf.placeholder(tf.float32, shape=(None))
if 1:
for idx, l in enumerate(net_struct):
act_trn, act_tst = ops.cascade_bn_relu_trn_tst(
act_trn, prev_layer_size, l, name='layer' + str(idx), input_tst = act_tst)
prev_layer_size += l
w = tf.Variable(tf.random_uniform([prev_layer_size, size_act],minval = -1., maxval = 1.), name='net_output_w') * 1e-3
b = tf.Variable(tf.random_uniform([size_act],minval = -1., maxval = 1.), name='net_output_bias') * 1e-3
else:
for idx, l in enumerate(net_struct):
act_trn = ops.linear(act_trn, l, 'layer' + str(idx))
w = tf.Variable(tf.random_uniform([l, size_act],minval = -1., maxval = 1.), name='net_output_w') * 1e-2
b = tf.Variable(tf.random_uniform([size_act],minval = -1., maxval = 1.), name='net_output_bias') * 1e-2
self.yhat = tf.reshape(tf.matmul(act_trn, w) + b, [-1, size_act])
self.yhat_tst = tf.reshape(tf.matmul(act_tst, w) + b, [-1, size_act])
self.obs_act = tf.concat((self.obs, self.yhat),1)
self.Q = Q(size_obs + size_act, tf.stop_gradient(self.obs_act))
self.act = tf.placeholder(tf.float32, shape=(None))
self.l2_loss = tf.reduce_mean(tf.square(self.yhat - self.act))
self.adv_loss = tf.reduce_mean(tf.square(self.yhat_tst - self.act))
#-1*tf.gather_nd(output_tst, self.y_raw, axis=1)output_tst[list(np.arange(bs)),self.y_raw]
self.advers = tf.gradients(self.l2_loss, self.obs)
t_vars = tf.trainable_variables()
net_vars = [var for var in t_vars if 'net_' in var.name]
self.reg_loss = tf.reduce_sum([tf.reduce_sum(tf.square(var)) for var in net_vars])*self.l2_reg
optimizer = tf.train.AdamOptimizer(learning_rate=self.lr)
gvs = optimizer.compute_gradients(self.l2_loss + self.reg_loss - self.Q.yhat * self.Q_lr + self.Q.l2_loss)
self.grad_norm = tf.reduce_mean([tf.reduce_mean(grad) for grad, var in gvs if grad is not None])
clip_norm = 100
clip_single = 1
capped_gvs = [(tf.clip_by_value(grad, -1*clip_single,clip_single), var) for grad, var in gvs if grad is not None]
capped_gvs = [(tf.clip_by_norm(grad, clip_norm), var) for grad, var in capped_gvs if grad is not None]
self.optimizer = optimizer.apply_gradients(capped_gvs)
#self.optimizer = tf.train.AdamOptimizer(self.lr).minimize(self.l2_loss)
self.cur_Q_lr = 0
self.session = tf.Session()
self.session.run(tf.global_variables_initializer())
self.Saver = tf.train.Saver()
def train(self, x, y=None, max_entropy=True, epochs=100, batch_size=64, lr=1e-3, tau_rate = 1e-4, task = 'autoencoder'):
taskdict = {
'autoencoder': self.L1,
'classification': self.CrossEnt
}
schedule = lambda i: np.float32(np.max((0.5, np.exp(-tau_rate*i))))
y = (x if y is None else y)
if task in taskdict:
self.taskLoss = taskdict[task]
self.Loss = self.taskLoss - (self.Entropy if max_entropy else tf.stop_gradient(self.Entropy))
else:
raise ValueError('task not supported yet')
#Optimizer
solver = tf.train.AdagradOptimizer(learning_rate = lr).minimize(self.Loss, var_list=self.params)
#Need to clip gradients as they get huge for gumbel softmax + stein gd
#gradients, variables = zip(*solver.compute_gradients(self.Loss, var_list=self.params))
#gradients, _ = tf.clip_by_global_norm(gradients, 5.0)
#solver = solver.apply_gradients(zip(gradients, variables))
#Training
init = tf.global_variables_initializer()
sess = tf.Session()
self.sess = sess
with sess.as_default():
sess.run(init)
losses = []
tasklosses = []
ents = []
stds = []
n_batches = int(x.shape[0]/float(batch_size))
for epoch in range(epochs):
rand_idxs = np.arange(x.shape[0])
np.random.shuffle(rand_idxs)
loss = 0
task_loss = 0
ent = 0
std = 0
for batch in range(n_batches):
tau = schedule(epoch*n_batches + batch)
mb_idx = rand_idxs[batch*batch_size:(batch+1)*batch_size]
x_mb = x[mb_idx]
y_mb = y[mb_idx]
g = np.random.gumbel(size=(len(x_mb), self.k, 2))
_, loss_curr, taskloss_curr, ent_curr, std_curr = sess.run([solver, self.Loss, self.taskLoss, self.Entropy, self.std], feed_dict = {self.X:x_mb, self.Y:y_mb, self.g: g, self.tau: tau})
loss += loss_curr/n_batches
task_loss += taskloss_curr/n_batches
ent += ent_curr/n_batches
std += np.mean(np.abs(std_curr))/n_batches
losses.append(loss)
tasklosses.append(task_loss)
ents.append(ent)
stds.append(std)
print('Final task loss: %f' %(tasklosses[-1]))
plt.figure()
plt.plot(losses)
plt.title('total loss')
plt.figure()
plt.plot(tasklosses)
plt.title('task loss')
plt.figure()
plt.plot(np.array(ents) * 1.442695) #in bits
plt.title('ent')
plt.figure()
plt.plot(stds)
plt.title('std')
def layers(vgg_layer3_out, vgg_layer4_out, vgg_layer7_out, num_classes):
"""
Create the layers for a fully convolutional network. Build skip-layers using the vgg layers.
:param vgg_layer7_out: TF Tensor for VGG Layer 3 output
:param vgg_layer4_out: TF Tensor for VGG Layer 4 output
:param vgg_layer3_out: TF Tensor for VGG Layer 7 output
:param num_classes: Number of classes to classify
:return: The Tensor for the last layer of output
"""
# 1x1 convolution layer for feature extraction
tf_conv1x1 = tf.layers.conv2d(
vgg_layer7_out,
num_classes,
1,
1,
kernel_regularizer=tf.contrib.layers.l2_regularizer(1e-3),
kernel_initializer=tf.truncated_normal_initializer(stddev=0.01))
# conv2d-transpose for 2x upsampling
tf_2x = tf.layers.conv2d_transpose(
tf_conv1x1,
num_classes,
4,
2,
padding='SAME',
kernel_regularizer=tf.contrib.layers.l2_regularizer(1e-3),
kernel_initializer=tf.truncated_normal_initializer(stddev=0.01))
# combine with pooling layer 4
tf_skip1 = tf.add(
tf_2x,
tf.layers.conv2d(
vgg_layer4_out,
num_classes,
1,
1,
kernel_regularizer=tf.contrib.layers.l2_regularizer(1e-3),
kernel_initializer=tf.truncated_normal_initializer(stddev=0.01)))
# perform conv2d-transpose for 2x upsampling again.
# output: 4x features + 2x pool4
tf_4x = tf.layers.conv2d_transpose(
tf_skip1,
num_classes,
4,
2,
padding='SAME',
kernel_regularizer=tf.contrib.layers.l2_regularizer(1e-3),
kernel_initializer=tf.truncated_normal_initializer(stddev=0.01))
# combile with pooling layer 3
tf_skip2 = tf.add(
tf_4x,
tf.layers.conv2d(
vgg_layer3_out,
num_classes,
1,
1,
kernel_regularizer=tf.contrib.layers.l2_regularizer(1e-3),
kernel_initializer=tf.truncated_normal_initializer(stddev=0.01)))
# perform conv2d-transpose for 2x upsampling again.
# output: 8x features + 4x pool4 + 2x pool3
tf_final = tf.layers.conv2d_transpose(
tf_skip2,
num_classes,
16,
8,
padding='SAME',
kernel_regularizer=tf.contrib.layers.l2_regularizer(1e-3),
kernel_initializer=tf.truncated_normal_initializer(stddev=0.01))
tf.stop_gradient(vgg_layer3_out)
tf.stop_gradient(vgg_layer4_out)
tf.stop_gradient(vgg_layer7_out)
return tf_final
def setup_model(self):
with SetVerbosity(self.verbose):
self.graph = tf.Graph()
with self.graph.as_default():
self.set_random_seed(self.seed)
self.sess = tf_util.make_session(num_cpu=self.n_cpu_tf_sess, graph=self.graph)
self.replay_buffer = ReplayBuffer(self.buffer_size)
self.full_buffers = [FullBuffer(self.full_size, self.env.observation_space.shape[0], self.env.action_space.shape[0])
for _ in range(len(self.env.unwrapped.tasks))]
self.env.task_idx = 0
with tf.variable_scope("input", reuse=False):
# Create policy and target TF objects
self.policy_tf = self.policy(self.sess, self.observation_space, self.action_space,
**self.policy_kwargs)
self.target_policy = self.policy(self.sess, self.observation_space, self.action_space,
**self.policy_kwargs)
# Initialize Placeholders
self.observations_ph = self.policy_tf.obs_ph
# Normalized observation for pixels
self.processed_obs_ph = self.policy_tf.processed_obs
self.next_observations_ph = self.target_policy.obs_ph
self.processed_next_obs_ph = self.target_policy.processed_obs
self.action_target = self.target_policy.action_ph
self.terminals_ph = tf.placeholder(tf.float32, shape=(None, 1), name='terminals')
self.rewards_ph = tf.placeholder(tf.float32, shape=(None, 1), name='rewards')
self.actions_ph = tf.placeholder(tf.float32, shape=(None,) + self.action_space.shape,
name='actions')
self.learning_rate_ph = tf.placeholder(tf.float32, [], name="learning_rate_ph")
with tf.variable_scope("model", reuse=False):
# Create the policy
# first return value corresponds to deterministic actions
# policy_out corresponds to stochastic actions, used for training
# logp_pi is the log probability of actions taken by the policy
self.deterministic_action, policy_out, logp_pi = self.policy_tf.make_actor(self.processed_obs_ph)
# Monitor the entropy of the policy,
# this is not used for training
self.entropy = tf.reduce_mean(self.policy_tf.entropy)
# Use two Q-functions to improve performance by reducing overestimation bias.
qf1, qf2, value_fn = self.policy_tf.make_critics(self.processed_obs_ph, self.actions_ph,
create_qf=True, create_vf=True)
qf1_pi, qf2_pi, _ = self.policy_tf.make_critics(self.processed_obs_ph,
policy_out, create_qf=True, create_vf=False,
reuse=True)
# Target entropy is used when learning the entropy coefficient
if self.target_entropy == 'auto':
# automatically set target entropy if needed
self.target_entropy = -np.prod(self.env.action_space.shape).astype(np.float32)
else:
# Force conversion
# this will also throw an error for unexpected string
self.target_entropy = float(self.target_entropy)
# The entropy coefficient or entropy can be learned automatically
# see Automating Entropy Adjustment for Maximum Entropy RL section
# of https://arxiv.org/abs/1812.05905
if isinstance(self.ent_coef, str) and self.ent_coef.startswith('auto'):
# Default initial value of ent_coef when learned
init_value = 1.0
if '_' in self.ent_coef:
init_value = float(self.ent_coef.split('_')[1])
assert init_value > 0., "The initial value of ent_coef must be greater than 0"
self.log_ent_coef = tf.get_variable('log_ent_coef', dtype=tf.float32,
initializer=np.log(init_value).astype(np.float32))
self.ent_coef = tf.exp(self.log_ent_coef)
else:
# Force conversion to float
# this will throw an error if a malformed string (different from 'auto')
# is passed
self.ent_coef = float(self.ent_coef)
with tf.variable_scope("target", reuse=False):
# Create the value network
_, _, value_target = self.target_policy.make_critics(self.processed_next_obs_ph,
create_qf=False, create_vf=True)
self.value_target = value_target
with tf.variable_scope("loss", reuse=False):
# Take the min of the two Q-Values (Double-Q Learning)
min_qf_pi = tf.minimum(qf1_pi, qf2_pi)
# Target for Q value regression
q_backup = tf.stop_gradient(
self.rewards_ph +
(1 - self.terminals_ph) * self.gamma * self.value_target
)
# Compute Q-Function loss
# TODO: test with huber loss (it would avoid too high values)
qf1_loss = 0.5 * tf.reduce_mean((q_backup - qf1) ** 2)
qf2_loss = 0.5 * tf.reduce_mean((q_backup - qf2) ** 2)
# Compute the entropy temperature loss
# it is used when the entropy coefficient is learned
ent_coef_loss, entropy_optimizer = None, None
if not isinstance(self.ent_coef, float):
ent_coef_loss = -tf.reduce_mean(
self.log_ent_coef * tf.stop_gradient(logp_pi + self.target_entropy))
entropy_optimizer = tf.train.AdamOptimizer(learning_rate=self.learning_rate_ph)
# Compute the policy loss
# Alternative: policy_kl_loss = tf.reduce_mean(logp_pi - min_qf_pi)
policy_kl_loss = tf.reduce_mean(self.ent_coef * logp_pi - qf1_pi)
# NOTE: in the original implementation, they have an additional
# regularization loss for the Gaussian parameters
# this is not used for now
# policy_loss = (policy_kl_loss + policy_regularization_loss)
policy_loss = policy_kl_loss
# Target for value fn regression
# We update the vf towards the min of two Q-functions in order to
# reduce overestimation bias from function approximation error.
v_backup = tf.stop_gradient(min_qf_pi - self.ent_coef * logp_pi)
value_loss = 0.5 * tf.reduce_mean((value_fn - v_backup) ** 2)
values_losses = qf1_loss + qf2_loss + value_loss
# Policy train op
# (has to be separate from value train op, because min_qf_pi appears in policy_loss)
policy_optimizer = tf.train.AdamOptimizer(learning_rate=self.learning_rate_ph)
policy_train_op = policy_optimizer.minimize(policy_loss, var_list=get_vars('model/pi'))
# Value train op
value_optimizer = tf.train.AdamOptimizer(learning_rate=self.learning_rate_ph)
values_params = get_vars('model/values_fn')
source_params = get_vars("model/values_fn/vf")
target_params = get_vars("target/values_fn/vf")
# Polyak averaging for target variables
self.target_update_op = [
tf.assign(target, (1 - self.tau) * target + self.tau * source)
for target, source in zip(target_params, source_params)
]
# Initializing target to match source variables
target_init_op = [
tf.assign(target, source)
for target, source in zip(target_params, source_params)
]
# Control flow is used because sess.run otherwise evaluates in nondeterministic order
# and we first need to compute the policy action before computing q values losses
with tf.control_dependencies([policy_train_op]):
train_values_op = value_optimizer.minimize(values_losses, var_list=values_params)
self.infos_names = ['policy_loss', 'qf1_loss', 'qf2_loss', 'value_loss', 'entropy']
# All ops to call during one training step
self.step_ops = [policy_loss, qf1_loss, qf2_loss,
value_loss, qf1, qf2, value_fn, logp_pi,
self.entropy, policy_train_op, train_values_op]
# Add entropy coefficient optimization operation if needed
if ent_coef_loss is not None:
with tf.control_dependencies([train_values_op]):
ent_coef_op = entropy_optimizer.minimize(ent_coef_loss, var_list=self.log_ent_coef)
self.infos_names += ['ent_coef_loss', 'ent_coef']
self.step_ops += [ent_coef_op, ent_coef_loss, self.ent_coef]
# Monitor losses and entropy in tensorboard
tf.summary.scalar('policy_loss', policy_loss)
tf.summary.scalar('qf1_loss', qf1_loss)
tf.summary.scalar('qf2_loss', qf2_loss)
tf.summary.scalar('value_loss', value_loss)
tf.summary.scalar('entropy', self.entropy)
if ent_coef_loss is not None:
tf.summary.scalar('ent_coef_loss', ent_coef_loss)
tf.summary.scalar('ent_coef', self.ent_coef)
tf.summary.scalar('learning_rate', tf.reduce_mean(self.learning_rate_ph))
# Retrieve parameters that must be saved
self.params = get_vars("model")
self.target_params = get_vars("target/values_fn/vf")
# Initialize Variables and target network
with self.sess.as_default():
self.sess.run(tf.global_variables_initializer())
self.sess.run(target_init_op)
self.summary = tf.summary.merge_all()
def build_loss(self, predictions, examples, **kwargs):
"""Build tf graph to compute loss.
Args:
predictions: dict of prediction results keyed by name.
examples: dict of inputs keyed by name.
Returns:
loss_dict: dict of loss tensors keyed by name.
"""
options = self._model_proto
loss_dict = {}
with tf.name_scope('losses'):
# Loss of the MIDN module.
labels = self._label_extractor.extract_labels(examples)
losses = tf.nn.sigmoid_cross_entropy_with_logits(
labels=labels,
logits=predictions[Cap2DetPredictions.midn_class_logits])
loss_dict['midn_cross_entropy_loss'] = tf.multiply(
tf.reduce_mean(losses), options.midn_loss_weight)
# Losses of the OICR module.
(num_proposals,
proposals) = (predictions[DetectionResultFields.num_proposals],
predictions[DetectionResultFields.proposal_boxes])
batch, max_num_proposals, _ = utils.get_tensor_shape(proposals)
proposal_scores_0 = predictions[
Cap2DetPredictions.oicr_proposal_scores + '_at_0']
if options.oicr_use_proba_r_given_c:
proposal_scores_0 = predictions[
Cap2DetPredictions.midn_proba_r_given_c]
proposal_scores_0 = tf.concat([
tf.fill([batch, max_num_proposals, 1], 0.0), proposal_scores_0
],
axis=-1)
for i in range(options.oicr_iterations):
proposal_scores_1 = predictions[
Cap2DetPredictions.oicr_proposal_scores +
'_at_{}'.format(i + 1)]
oicr_cross_entropy_loss_at_i = model_utils.calc_oicr_loss(
labels,
num_proposals,
proposals,
tf.stop_gradient(proposal_scores_0),
proposal_scores_1,
scope='oicr_{}'.format(i + 1),
iou_threshold=options.oicr_iou_threshold)
loss_dict['oicr_cross_entropy_loss_at_{}'.format(
i + 1)] = tf.multiply(oicr_cross_entropy_loss_at_i,
options.oicr_loss_weight)
proposal_scores_0 = tf.nn.softmax(proposal_scores_1, axis=-1)
return loss_dict
def forward(self,
Ts,
images,
depths,
intrinsics,
inds=None,
num_fixed=0,
init=tf.constant(False)):
# motion network performs projection operations in features space
cfg = self.cfg
batch = tf.shape(images)[0]
num = tf.shape(images)[1]
if cfg.RESCALE_IMAGES:
images = 2 * (images / 255.0) - 1.0
if inds is None:
if self.mode == 'keyframe':
self.inds = self._keyframe_pairs_indicies(num)
num_fixed = 1
elif self.mode == 'global':
self.inds = self._all_pairs_indicies(num)
else:
self.inds = inds
(ii, jj) = self.inds
intrinsics = intrinsics_vec_to_matrix(intrinsics)
# if self.is_training and (not self.is_calibrated):
# perturbation = 0.1 * tf.random.normal([batch, 1])
# intrinsics = update_intrinsics(intrinsics, perturbation)
depths_low, intrinsics = rescale_depths_and_intrinsics(depths,
intrinsics,
downscale=4)
with tf.variable_scope("motion", reuse=self.reuse) as sc:
if Ts is None:
Ts = self.pose_regressor_init(images)
else:
if self.use_regressor:
Gs = self.pose_regressor_init(images)
Ts = cond_transform(init, Gs, Ts)
feats = self.extract_features(images)
depths = tf.gather(depths_low, ii, axis=1) + EPS
feats1 = tf.gather(feats, ii, axis=1)
feats2 = tf.gather(feats, jj, axis=1)
Ti = Ts.gather(ii)
Tj = Ts.gather(jj)
Tij = Tj * Ti.inv()
for i in range(cfg.FLOWSE3.ITER_COUNT):
Tij = Tij.copy(stop_gradients=True)
Ts = Ts.copy(stop_gradients=True)
intrinsics = tf.stop_gradient(intrinsics)
coords, vmask = Tij.transform(depths,
intrinsics,
valid_mask=True)
featsw = vmask * bilinear_sampler(feats2, coords, batch_dims=2)
with tf.name_scope("residual"):
flow, weight = self.flownet(feats1, featsw, reuse=i > 0)
self.weights_history.append(weight)
target = flow + coords
weight = vmask * tf.nn.sigmoid(weight)
with tf.name_scope("PnP"):
if (self.mode == 'keyframe') and self.is_calibrated:
Tij = Tij.keyframe_optim(target, weight, depths,
intrinsics)
Ts = Tij.append_identity(
) # set keyframe pose to identity
else:
Ts, intrinsics = Ts.global_optim(
target,
weight,
depths,
intrinsics, (jj, ii),
num_fixed=num_fixed,
include_intrinsics=(not self.is_calibrated))
Tij = Ts.gather(jj) * Ts.gather(
ii).inv() # relative poses
coords, vmask1 = Tij.transform(depths,
intrinsics,
valid_mask=True)
self.transform_history.append(Ts)
self.residual_history.append(vmask * vmask1 *
(coords - target))
self.intrinsics_history.append(
intrinsics_matrix_to_vec(intrinsics))
intrinsics = 4.0 * intrinsics_matrix_to_vec(intrinsics)
return Ts, intrinsics
def train_step():
experience, _ = next(iterator)
prior = predictor_net(
(experience.observation[:, 0], experience.action[:, 0]),
training=False)
z_next = encoder_net(experience.observation[:, 1], training=False)
# predictor_kl is a vector of size batch_size.
predictor_kl = tfp.distributions.kl_divergence(z_next, prior)
with tf.GradientTape() as tape:
tape.watch(actor_net._log_kl_coefficient) # pylint: disable=protected-access
dual_loss = -1.0 * actor_net._log_kl_coefficient * ( # pylint: disable=protected-access
tf.stop_gradient(tf.reduce_mean(predictor_kl)) -
kl_constraint)
dual_grads = tape.gradient(dual_loss,
[actor_net._log_kl_coefficient]) # pylint: disable=protected-access
grads_and_vars = list(
zip(dual_grads, [actor_net._log_kl_coefficient])) # pylint: disable=protected-access
dual_optimizer.apply_gradients(grads_and_vars)
# Clip the dual variable so exp(log_kl_coef) <= 1e6.
log_kl_coef = tf.clip_by_value(
actor_net._log_kl_coefficient, # pylint: disable=protected-access
-1.0 * np.log(1e6),
np.log(1e6))
actor_net._log_kl_coefficient.assign(log_kl_coef) # pylint: disable=protected-access
with tf.name_scope('dual_loss'):
tf.compat.v2.summary.scalar(name='dual_loss',
data=tf.reduce_mean(dual_loss),
step=global_step)
tf.compat.v2.summary.scalar(
name='log_kl_coefficient',
data=actor_net._log_kl_coefficient, # pylint: disable=protected-access
step=global_step)
z_entropy = z_next.entropy()
log_prob = prior.log_prob(z_next.sample())
with tf.name_scope('rp-metrics'):
common.generate_tensor_summaries('predictor_kl', predictor_kl,
global_step)
common.generate_tensor_summaries('z_entropy', z_entropy,
global_step)
common.generate_tensor_summaries('log_prob', log_prob,
global_step)
common.generate_tensor_summaries('z_mean', z_next.mean(),
global_step)
common.generate_tensor_summaries('z_stddev', z_next.stddev(),
global_step)
common.generate_tensor_summaries('prior_mean', prior.mean(),
global_step)
common.generate_tensor_summaries('prior_stddev',
prior.stddev(), global_step)
if log_prob_reward_scale == 'auto':
coef = tf.stop_gradient(tf.exp(actor_net._log_kl_coefficient)) # pylint: disable=protected-access
else:
coef = log_prob_reward_scale
tf.debugging.check_numerics(tf.reduce_mean(predictor_kl),
'predictor_kl is inf or nan.')
tf.debugging.check_numerics(coef, 'coef is inf or nan.')
new_reward = experience.reward - coef * predictor_kl[:, None]
experience = experience._replace(reward=new_reward)
return tf_agent.train(experience)
def loss(self, predictions, policy, cfv):
pi = cpea.rm_policy(predictions)
inst_r = cfv - cpea.utility(pi, cfv)
inst_q = tf.stop_gradient(tf.maximum(inst_r, -tf.nn.relu(predictions)))
return tf.reduce_mean(
tf.reduce_sum(tf.square(predictions - inst_q), axis=1)) / 2.0
def build_train(make_obs_ph,
q_func,
num_actions,
optimizer_f,
grad_norm_clipping=None,
gamma=1.0,
scope="setdeepq",
reuse=None,
test_eps=0.05,
lr_init=0.001,
lr_period_steps=250000,
tau=0.05):
"""Creates the train function:
Parameters
----------
make_obs_ph: str -> tf.placeholder or TfInput
a function that takes a name and creates a placeholder of input with that name
q_func: (tf.Variable, int, str, bool) -> tf.Variable
the model that takes the following inputs:
observation_in: object
the output of observation placeholder
num_actions: int
number of actions
scope: str
reuse: bool
should be passed to outer variable scope
and returns a tensor of shape (batch_size, num_actions) with values of every action.
num_actions: int
number of actions
reuse: bool
whether or not to reuse the graph variables
optimizer: tf.train.Optimizer
optimizer to use for the Q-learning objective.
grad_norm_clipping: float or None
clip gradient norms to this value. If None no clipping is performed.
gamma: float
discount rate.
scope: str or VariableScope
optional scope for variable_scope.
reuse: bool or None
whether or not the variables should be reused. To be able to reuse the scope must be given.
lr_init : float
initial learning rate
lr_period : int
learning rate schedule following a cosine with this period
tau : float
parameter for the soft target network update. tau <= 1.0 and 1.0 for
the hard update.
Returns
-------
act: (tf.Variable, bool, float) -> tf.Variable
function to select and action given observation.
` See the top of the file for details.
train: (object, np.array, np.array, object, np.array, np.array) -> np.array
optimize the error in Bellman's equation.
` See the top of the file for details.
update_target: () -> ()
copy the parameters from optimized Q function to the target Q function.
` See the top of the file for details.
debug: {str: function}
a bunch of functions to print debug data like q_values.
"""
# Build action graphs
act_f = build_act(make_obs_ph,
q_func,
num_actions,
scope=scope,
reuse=reuse)
act_greedy = build_act_greedy(make_obs_ph,
q_func,
num_actions,
scope=scope,
reuse=True,
eps=test_eps)
with tf.compat.v1.variable_scope(scope, reuse=reuse):
# set up placeholders
obs_t_input = make_obs_ph("obs_t")
act_t_ph = tf.compat.v1.placeholder(tf.int32, [None], name="action")
rew_t_ph = tf.compat.v1.placeholder(tf.float32, [None], name="reward")
obs_tp1_input = make_obs_ph("obs_tp1")
done_mask_ph = tf.compat.v1.placeholder(tf.float32, [None],
name="done")
importance_weights_ph = tf.compat.v1.placeholder(tf.float32, [None],
name="weight")
iteration = tf.compat.v1.placeholder(tf.float32, name="iteration")
# Cosine learning rate adjustment
lr = tf.Variable(float(lr_init),
trainable=False,
dtype=tf.float32,
name='lr')
lr = tf.clip_by_value(
0.0005 * tf.math.cos(math.pi * iteration / lr_period_steps) +
0.000501, 1e-6, 1e-3)
optimizer = optimizer_f(learning_rate=lr)
# q network evaluation
q1_t = q_func.forward(obs_t_input.get(),
num_actions,
scope="q1_func",
reuse=True) # reuse q1 parameters from act
q1_func_vars = tf.compat.v1.get_collection(
tf.compat.v1.GraphKeys.TRAINABLE_VARIABLES,
scope=tf.compat.v1.get_variable_scope().name + "/q1_func")
q2_t = q_func.forward(obs_t_input.get(),
num_actions,
scope="q2_func",
reuse=True) # reuse q2 parameters from act
q2_func_vars = tf.compat.v1.get_collection(
tf.compat.v1.GraphKeys.TRAINABLE_VARIABLES,
scope=tf.compat.v1.get_variable_scope().name + "/q2_func")
# target q network evalution
q1_tp1 = q_func.forward(obs_tp1_input.get(),
num_actions,
scope="target_q1_func",
reuse=False)
target_q1_func_vars = tf.compat.v1.get_collection(
tf.compat.v1.GraphKeys.TRAINABLE_VARIABLES,
scope=tf.compat.v1.get_variable_scope().name + "/target_q1_func")
q2_tp1 = q_func.forward(obs_tp1_input.get(),
num_actions,
scope="target_q2_func",
reuse=False)
target_q2_func_vars = tf.compat.v1.get_collection(
tf.compat.v1.GraphKeys.TRAINABLE_VARIABLES,
scope=tf.compat.v1.get_variable_scope().name + "/target_q2_func")
# q scores for actions which we know were selected in the given state.
q1_t_selected = tf.reduce_sum(input_tensor=q1_t *
tf.one_hot(act_t_ph, num_actions),
axis=1)
q2_t_selected = tf.reduce_sum(input_tensor=q2_t *
tf.one_hot(act_t_ph, num_actions),
axis=1)
# Actions selected with current q funcs at state t+1.
q1_tp1_using_online_net = q_func.forward(obs_tp1_input.get(),
num_actions,
scope="q1_func",
reuse=True)
q2_tp1_using_online_net = q_func.forward(obs_tp1_input.get(),
num_actions,
scope="q2_func",
reuse=True)
tp1_best_action_using_online_net = tf.argmax(
input=q1_tp1_using_online_net + q2_tp1_using_online_net, axis=1)
# Using action at t+1 find target value associated with the action
q1_tp1_selected = tf.reduce_sum(
input_tensor=q1_tp1 *
tf.one_hot(tp1_best_action_using_online_net, num_actions),
axis=1)
q2_tp1_selected = tf.reduce_sum(
input_tensor=q2_tp1 *
tf.one_hot(tp1_best_action_using_online_net, num_actions),
axis=1)
# Min of target q values to be used bellman equation
q_tp1_best = tf.minimum(q1_tp1_selected, q2_tp1_selected)
# compute RHS of bellman equation
q_tp1_selected_target = rew_t_ph + gamma * q_tp1_best
# compute the error (potentially clipped)
td_error1 = q1_t_selected - tf.stop_gradient(q_tp1_selected_target)
td_error2 = q2_t_selected - tf.stop_gradient(q_tp1_selected_target)
errors1 = U.huber_loss(td_error1)
errors2 = U.huber_loss(td_error2)
errors = errors1 + errors2
weighted_error = tf.reduce_mean(input_tensor=importance_weights_ph *
errors)
#Print total number of params
total_parameters = 0
for variable in tf.compat.v1.trainable_variables():
# shape is an array of tf.Dimension
shape = variable.get_shape()
variable_parameters = 1
for dim in shape:
variable_parameters *= dim.value
# print("var params", variable_parameters)
total_parameters += variable_parameters
print(
"===============================================================")
print("Total number of trainable params:", total_parameters)
print(
"===============================================================")
# Log for tensorboard
tf.summary.scalar('q1_values', tf.math.reduce_mean(q1_t))
tf.summary.scalar('q2_values', tf.math.reduce_mean(q2_t))
tf.summary.scalar('td_1', tf.math.reduce_mean(td_error1))
tf.summary.scalar('td_2', tf.math.reduce_mean(td_error2))
tf.summary.scalar('weighted_loss', weighted_error)
tf.summary.scalar('lr_schedule', lr)
tf.summary.scalar('td_MSE_1',
tf.math.reduce_mean(tf.math.square(td_error1)))
tf.summary.scalar('td_MSE_2',
tf.math.reduce_mean(tf.math.square(td_error2)))
# combine variable scopes
q_func_vars = q1_func_vars + q2_func_vars
# compute optimization op (potentially with gradient clipping)
if grad_norm_clipping is not None:
gradients = optimizer.compute_gradients(weighted_error,
var_list=q_func_vars)
for i, (grad, var) in enumerate(gradients):
if grad is not None:
gradients[i] = (tf.clip_by_norm(grad,
grad_norm_clipping), var)
optimize_expr = optimizer.apply_gradients(gradients)
else:
optimize_expr = optimizer.minimize(weighted_error,
var_list=q_func_vars)
# update_target_fn will be called every step to copy Q network to target Q network
# target network is updated with polyak averaging
update_target_expr1 = []
for var, var_target in zip(
sorted(q1_func_vars, key=lambda v: v.name),
sorted(target_q1_func_vars, key=lambda v: v.name)):
update_target_expr1.append(
var_target.assign(tau * var + (1 - tau) * var_target))
update_target_expr1 = tf.group(*update_target_expr1)
update_target_expr2 = []
for var, var_target in zip(
sorted(q2_func_vars, key=lambda v: v.name),
sorted(target_q2_func_vars, key=lambda v: v.name)):
update_target_expr2.append(
var_target.assign(tau * var + (1 - tau) * var_target))
update_target_expr2 = tf.group(*update_target_expr2)
merged_summary = tf.compat.v1.summary.merge_all(
scope=tf.compat.v1.get_variable_scope().name)
# Create callable functions
train = U.function(inputs=[
obs_t_input, act_t_ph, rew_t_ph, obs_tp1_input, done_mask_ph,
importance_weights_ph, iteration
],
outputs=[
td_error1, td_error2,
tf.reduce_mean(input_tensor=errors),
merged_summary
],
updates=[optimize_expr, lr])
update_target = U.function(
[], [], updates=[update_target_expr1, update_target_expr2])
q_values = U.function(inputs=[obs_t_input], outputs=[q1_t, q2_t])
return act_f, act_greedy, q_values, train, update_target, {
'q_values': q_values
}
def build_learner(pre, post, act_space, num_frames):
global_step = tf.train.get_or_create_global_step()
init_lr = FLAGS.init_lr
decay = FLAGS.lr_decay
warmup_steps = FLAGS.warmup_steps
use_rmc = FLAGS.use_rmc
use_hrmc = FLAGS.use_hrmc
use_icm = FLAGS.use_icm
use_coex = FLAGS.use_coex
use_reward_prediction = FLAGS.use_reward_prediction
use_pixel_control = FLAGS.use_pixel_control
pq_kl_coef = FLAGS.pq_kl_coef
p_kl_coef = FLAGS.p_kl_coef
global_step_float = tf.cast(global_step, tf.float32)
lr = tf.train.polynomial_decay(
init_lr, global_step,
FLAGS.total_environment_frames // (FLAGS.batch_size * FLAGS.seqlen),
init_lr / 10.)
is_warmup = tf.cast(global_step_float < warmup_steps, tf.float32)
lr = is_warmup * global_step_float / warmup_steps * init_lr + (
1.0 - is_warmup) * (init_lr * (1.0 - decay) + lr * decay)
optimizer = tf.train.AdamOptimizer(lr)
ent_coef = tf.train.polynomial_decay(
FLAGS.ent_coef, global_step, FLAGS.total_environment_frames * 2 //
(FLAGS.batch_size * FLAGS.seqlen), FLAGS.ent_coef / 10.)
if FLAGS.zero_init:
pre["state_in"] = tf.zeros_like(pre["state_in"])
if use_hrmc:
rnn = TmpHierRMCRNN(4,
64,
4,
4,
4,
return_sequences=True,
return_state=True,
name="hrmcrnn")
elif use_rmc:
rnn = RMCRNN(64,
4,
4,
return_sequences=True,
return_state=True,
name="rmcrnn")
else:
rnn = tf.compat.v1.keras.layers.LSTM(256,
return_sequences=True,
return_state=True,
name="lstm")
pre_model = Model(act_space, rnn, use_rmc, use_hrmc, use_reward_prediction,
use_pixel_control, "agent", **pre)
post["state_in"] = tf.stop_gradient(pre_model.state_out)
post_model = Model(act_space, rnn, use_rmc, use_hrmc,
use_reward_prediction, use_pixel_control, "agent",
**post)
tf.summary.scalar("adv_mean", post_model.adv_mean)
tf.summary.scalar("adv_std", post_model.adv_std)
losses = dPPOcC(act=post_model.a_t,
policy_logits=post_model.current_act_logits,
old_policy_logits=post_model.old_act_logits,
advantage=post_model.advantage,
policy_clip=FLAGS.ppo_clip,
vf=post_model.current_value,
vf_target=post_model.ret,
value_clip=FLAGS.vf_clip,
old_vf=post_model.old_current_value)
entropy_loss = tf.reduce_mean(
entropy(post_model.current_act_logits) * post_model.slots)
p_loss = tf.reduce_mean(losses.p_loss * post_model.slots)
v_loss = tf.reduce_mean(losses.v_loss * post_model.slots)
add_loss = 0.0
if use_icm:
icmloss = icm(post_model.cnn_feature[:, :-1, :],
post_model.cnn_feature[:, 1:, :], post_model.a_t[:, :-1],
act_space)
add_loss += 0.2 * tf.reduce_mean(
icmloss.f_loss * post_model.slots[:, :-1]) + 0.8 * tf.reduce_mean(
icmloss.i_loss * post_model.slots[:, :-1])
if use_coex:
coexloss = coex(post_model.image_feature[:, :-1, :, :, :],
post_model.image_feature[:, 1:, :, :, :],
post_model.a_t[:, :-1], act_space)
add_loss += tf.reduce_mean(coexloss * post_model.slots[:, :-1])
if use_hrmc:
pq_kl_loss = KL_from_gaussians(post_model.q_mus, post_model.q_sigmas,
post_model.p_mus, post_model.p_sigmas)
pq_kl_loss = tf.reduce_mean(pq_kl_loss * post_model.slots)
tf.summary.scalar("kl_div", pq_kl_loss)
add_loss += pq_kl_coef * pq_kl_loss
p_kl_loss = KL_from_gaussians(post_model.p_mus, post_model.p_sigmas,
tf.zeros_like(post_model.p_mus),
0.01 * tf.ones_like(post_model.p_sigmas))
p_kl_loss = tf.reduce_mean(p_kl_loss * post_model.slots)
tf.summary.scalar("kl_div_prior", p_kl_loss)
add_loss += p_kl_coef * p_kl_loss
if use_reward_prediction:
r_loss = tf.reduce_mean(
mse(post_model.reward_prediction, post_model.r_t) *
post_model.slots)
tf.summary.scalar("r_loss", r_loss)
add_loss += r_loss
if use_pixel_control:
rec_loss = tf.reduce_mean(
mse(post_model.pixel_control, post_model.s_t) *
post_model.slots[:, :, None, None, None])
tf.summary.scalar("rec_loss", rec_loss)
add_loss += rec_loss
loss = (FLAGS.pi_coef * p_loss + FLAGS.vf_coef * v_loss -
ent_coef * entropy_loss + add_loss)
train_op = miniOp(optimizer, loss, FLAGS.grad_clip)
new_frames = tf.reduce_sum(post["slots"])
with tf.control_dependencies([train_op]):
num_frames_and_train = tf.assign_add(num_frames, new_frames)
global_step_and_train = tf.assign_add(global_step, 1)
tf.summary.scalar("learning_rate", lr)
tf.summary.scalar("ent_coef", ent_coef)
tf.summary.scalar("ent_loss", entropy_loss)
tf.summary.scalar("p_loss", p_loss)
tf.summary.scalar("v_loss", v_loss)
tf.summary.scalar("all_loss", loss)
return num_frames_and_train, global_step_and_train
def create_variables(self):
# создание нейросети T копированием из исходной нейросети N
self.target_q_network = self.q_network.copy(scope="target_network")
# расчет управляющего действия
# FOR REGULAR ACTION SCORE COMPUTATION
with tf.name_scope("taking_action"):
# входные данные вектора состояния
self.observation = tf.placeholder(tf.float32,
(None, self.observation_size),
name="observation")
# расчитать очки оценки полезности каждого действия
self.action_scores = tf.identity(self.q_network(self.observation),
name="action_scores")
tf.histogram_summary("action_scores", self.action_scores)
# взять действие с максимальным количеством очков
self.predicted_actions = tf.argmax(self.action_scores,
dimension=1,
name="predicted_actions")
# расчет будущей пользы
with tf.name_scope("estimating_future_rewards"):
# FOR PREDICTING TARGET FUTURE REWARDS
# входной параметр - будущие состояния
self.next_observation = tf.placeholder(
tf.float32, (None, self.observation_size),
name="next_observation")
# входной параметр - маски будущих состояний
self.next_observation_mask = tf.placeholder(
tf.float32, (None, ), name="next_observation_mask")
# оценки полезности
self.next_action_scores = tf.stop_gradient(
self.target_q_network(self.next_observation))
tf.histogram_summary("target_action_scores",
self.next_action_scores)
# входной параметр - награды
self.rewards = tf.placeholder(tf.float32, (None, ), name="rewards")
# взять максимальные оценки полезностей действий
target_values = tf.identity(
tf.reduce_max(self.next_action_scores, reduction_indices=[
1,
]) * self.next_observation_mask,
name="target_values")
# r + DF * MAX(Q,s) см статью о Q-learning в википедии
#self.future_rewards = self.rewards + self.discount_rate * target_values
self.future_rewards = tf.identity(
self.rewards + self.discount_rate * target_values,
name="future_rewards")
# обученте сети N
with tf.name_scope("q_value_precition"):
# FOR PREDICTION ERROR
# входной параметр маски действий в наборе обучающих примеров
self.action_mask = tf.placeholder(tf.float32,
(None, self.num_actions),
name="action_mask")
# расчет полезностей действий набора обучающих примеров
self.masked_action_scores = tf.reduce_sum(
self.action_scores * self.action_mask,
reduction_indices=[
1,
],
name="masked_action_scores")
# разности текущих полезностей и будущих
# - (r + DF * MAX(Q,s) — Q[s',a'])
#temp_diff = self.masked_action_scores - self.future_rewards
temp_diff = tf.identity(self.masked_action_scores -
self.future_rewards,
name="temp_diff")
# ключевой момент обучения сети
# RMSProp минимизирует среднее от вышеуказанных разностей
self.prediction_error = tf.reduce_mean(tf.square(temp_diff),
name="prediction_error")
# работа RMSProp, первый шаг - вычисление градиентов
gradients = self.optimizer.compute_gradients(self.prediction_error)
#def get_zero(): return tf.constant(0.0)
#def get_perror(): return self.prediction_error
#gradients = self.optimizer.compute_gradients(tf.cond(tf.is_nan(self.prediction_error), get_zero, get_perror))
for i, (grad, var) in enumerate(gradients):
if grad is not None:
gradients[i] = (tf.clip_by_norm(grad, 5), var)
# Add histograms for gradients.
for grad, var in gradients:
tf.histogram_summary(var.name, var)
if grad is not None:
tf.histogram_summary(var.name + '/gradients', grad)
# второй шаг - оптимизация параметров нейросети
self.train_op = self.optimizer.apply_gradients(gradients,
name="train_op")
# то самое место где настраивается сеть T
# T = (1-alpha)*T + alpha*N
# UPDATE TARGET NETWORK
with tf.name_scope("target_network_update"):
self.target_network_update = []
for v_source, v_target in zip(self.q_network.variables(),
self.target_q_network.variables()):
# this is equivalent to target = (1-alpha) * target + alpha * source
update_op = v_target.assign_sub(
self.target_network_update_rate * (v_target - v_source))
self.target_network_update.append(update_op)
self.target_network_update = tf.group(*self.target_network_update,
name="target_network_update")
# summaries
tf.scalar_summary("prediction_error", self.prediction_error)
self.summarize = tf.merge_all_summaries()
self.no_op1 = tf.no_op()
def _create_network(self, reuse=False):
logger.info("Creating a DDPG agent with action space %d x %s..." % (self.dimu, self.max_u))
self.sess = tf_util.get_session()
# running averages
with tf.compat.v1.variable_scope('o_stats') as vs:
if reuse:
vs.reuse_variables()
self.o_stats = Normalizer(self.dimo, self.norm_eps, self.norm_clip, sess=self.sess)
with tf.compat.v1.variable_scope('g_stats') as vs:
if reuse:
vs.reuse_variables()
self.g_stats = Normalizer(self.dimg, self.norm_eps, self.norm_clip, sess=self.sess)
# mini-batch sampling.
batch = self.staging_tf.get()
batch_tf = OrderedDict([(key, batch[i])
for i, key in enumerate(self.stage_shapes.keys())])
batch_tf['r'] = tf.reshape(batch_tf['r'], [-1, 1])
#choose only the demo buffer samples
mask = np.concatenate((np.zeros(self.batch_size - self.demo_batch_size), np.ones(self.demo_batch_size)), axis = 0)
# networks
with tf.compat.v1.variable_scope('main') as vs:
if reuse:
vs.reuse_variables()
self.main = self.create_actor_critic(batch_tf, net_type='main', **self.__dict__)
vs.reuse_variables()
with tf.compat.v1.variable_scope('target') as vs:
if reuse:
vs.reuse_variables()
target_batch_tf = batch_tf.copy()
target_batch_tf['o'] = batch_tf['o_2']
target_batch_tf['g'] = batch_tf['g_2']
self.target = self.create_actor_critic(
target_batch_tf, net_type='target', **self.__dict__)
vs.reuse_variables()
assert len(self._vars("main")) == len(self._vars("target"))
# loss functions
target_Q_pi_tf = self.target.Q_pi_tf
clip_range = (-self.clip_return, 0. if self.clip_pos_returns else np.inf)
target_tf = tf.clip_by_value(batch_tf['r'] + self.gamma * target_Q_pi_tf, *clip_range)
self.Q_loss_tf = tf.reduce_mean(tf.square(tf.stop_gradient(target_tf) - self.main.Q_tf))
if self.bc_loss ==1 and self.q_filter == 1 : # train with demonstrations and use bc_loss and q_filter both
maskMain = tf.reshape(tf.boolean_mask(self.main.Q_tf > self.main.Q_pi_tf, mask), [-1]) #where is the demonstrator action better than actor action according to the critic? choose those samples only
#define the cloning loss on the actor's actions only on the samples which adhere to the above masks
self.cloning_loss_tf = tf.reduce_sum(tf.square(tf.boolean_mask(tf.boolean_mask((self.main.pi_tf), mask), maskMain, axis=0) - tf.boolean_mask(tf.boolean_mask((batch_tf['u']), mask), maskMain, axis=0)))
self.pi_loss_tf = -self.prm_loss_weight * tf.reduce_mean(self.main.Q_pi_tf) #primary loss scaled by it's respective weight prm_loss_weight
self.pi_loss_tf += self.prm_loss_weight * self.action_l2 * tf.reduce_mean(tf.square(self.main.pi_tf / self.max_u)) #L2 loss on action values scaled by the same weight prm_loss_weight
self.pi_loss_tf += self.aux_loss_weight * self.cloning_loss_tf #adding the cloning loss to the actor loss as an auxilliary loss scaled by its weight aux_loss_weight
elif self.bc_loss == 1 and self.q_filter == 0: # train with demonstrations without q_filter
self.cloning_loss_tf = tf.reduce_sum(tf.square(tf.boolean_mask((self.main.pi_tf), mask) - tf.boolean_mask((batch_tf['u']), mask)))
self.pi_loss_tf = -self.prm_loss_weight * tf.reduce_mean(self.main.Q_pi_tf)
self.pi_loss_tf += self.prm_loss_weight * self.action_l2 * tf.reduce_mean(tf.square(self.main.pi_tf / self.max_u))
self.pi_loss_tf += self.aux_loss_weight * self.cloning_loss_tf
else: #If not training with demonstrations
self.pi_loss_tf = -tf.reduce_mean(self.main.Q_pi_tf)
self.pi_loss_tf += self.action_l2 * tf.reduce_mean(tf.square(self.main.pi_tf / self.max_u))
Q_grads_tf = tf.gradients(self.Q_loss_tf, self._vars('main/Q'))
pi_grads_tf = tf.gradients(self.pi_loss_tf, self._vars('main/pi'))
assert len(self._vars('main/Q')) == len(Q_grads_tf)
assert len(self._vars('main/pi')) == len(pi_grads_tf)
self.Q_grads_vars_tf = zip(Q_grads_tf, self._vars('main/Q'))
self.pi_grads_vars_tf = zip(pi_grads_tf, self._vars('main/pi'))
self.Q_grad_tf = flatten_grads(grads=Q_grads_tf, var_list=self._vars('main/Q'))
self.pi_grad_tf = flatten_grads(grads=pi_grads_tf, var_list=self._vars('main/pi'))
# optimizers
self.Q_adam = MpiAdam(self._vars('main/Q'), scale_grad_by_procs=False)
self.pi_adam = MpiAdam(self._vars('main/pi'), scale_grad_by_procs=False)
# polyak averaging
self.main_vars = self._vars('main/Q') + self._vars('main/pi')
self.target_vars = self._vars('target/Q') + self._vars('target/pi')
self.stats_vars = self._global_vars('o_stats') + self._global_vars('g_stats')
self.init_target_net_op = list(
map(lambda v: v[0].assign(v[1]), zip(self.target_vars, self.main_vars)))
self.update_target_net_op = list(
map(lambda v: v[0].assign(self.polyak * v[0] + (1. - self.polyak) * v[1]), zip(self.target_vars, self.main_vars)))
# initialize all variables
tf.variables_initializer(self._global_vars('')).run()
self._sync_optimizers()
self._init_target_net()
def train_eval(
root_dir,
env_name='HalfCheetah-v2',
num_iterations=3000000,
actor_fc_layers=(),
critic_obs_fc_layers=None,
critic_action_fc_layers=None,
critic_joint_fc_layers=(256, 256),
initial_collect_steps=10000,
collect_steps_per_iteration=1,
replay_buffer_capacity=1000000,
# Params for target update
target_update_tau=0.005,
target_update_period=1,
# Params for train
train_steps_per_iteration=1,
batch_size=256,
actor_learning_rate=3e-4,
critic_learning_rate=3e-4,
alpha_learning_rate=3e-4,
dual_learning_rate=3e-4,
td_errors_loss_fn=tf.math.squared_difference,
gamma=0.99,
reward_scale_factor=0.1,
gradient_clipping=None,
use_tf_functions=True,
# Params for eval
num_eval_episodes=30,
eval_interval=10000,
# Params for summaries and logging
train_checkpoint_interval=50000,
policy_checkpoint_interval=50000,
rb_checkpoint_interval=50000,
log_interval=1000,
summary_interval=1000,
summaries_flush_secs=10,
debug_summaries=False,
summarize_grads_and_vars=False,
eval_metrics_callback=None,
latent_dim=10,
log_prob_reward_scale=0.0,
predictor_updates_encoder=False,
predict_prior=True,
use_recurrent_actor=False,
rnn_sequence_length=20,
clip_max_stddev=10.0,
clip_min_stddev=0.1,
clip_mean=30.0,
predictor_num_layers=2,
use_identity_encoder=False,
identity_encoder_single_stddev=False,
kl_constraint=1.0,
eval_dropout=(),
use_residual_predictor=True,
gym_kwargs=None,
predict_prior_std=True,
random_seed=0,
):
"""A simple train and eval for SAC."""
np.random.seed(random_seed)
tf.random.set_seed(random_seed)
if use_recurrent_actor:
batch_size = batch_size // rnn_sequence_length
root_dir = os.path.expanduser(root_dir)
train_dir = os.path.join(root_dir, 'train')
eval_dir = os.path.join(root_dir, 'eval')
train_summary_writer = tf.compat.v2.summary.create_file_writer(
train_dir, flush_millis=summaries_flush_secs * 1000)
train_summary_writer.set_as_default()
eval_summary_writer = tf.compat.v2.summary.create_file_writer(
eval_dir, flush_millis=summaries_flush_secs * 1000)
global_step = tf.compat.v1.train.get_or_create_global_step()
with tf.compat.v2.summary.record_if(
lambda: tf.math.equal(global_step % summary_interval, 0)):
_build_env = functools.partial(
suite_gym.load,
environment_name=env_name, # pylint: disable=invalid-name
gym_env_wrappers=(),
gym_kwargs=gym_kwargs)
tf_env = tf_py_environment.TFPyEnvironment(_build_env())
eval_vec = [] # (name, env, metrics)
eval_metrics = [
tf_metrics.AverageReturnMetric(buffer_size=num_eval_episodes),
tf_metrics.AverageEpisodeLengthMetric(
buffer_size=num_eval_episodes)
]
eval_tf_env = tf_py_environment.TFPyEnvironment(_build_env())
name = ''
eval_vec.append((name, eval_tf_env, eval_metrics))
time_step_spec = tf_env.time_step_spec()
observation_spec = time_step_spec.observation
action_spec = tf_env.action_spec()
if latent_dim == 'obs':
latent_dim = observation_spec.shape[0]
def _activation(t):
t1, t2 = tf.split(t, 2, axis=1)
low = -np.inf if clip_mean is None else -clip_mean
high = np.inf if clip_mean is None else clip_mean
t1 = rpc_utils.squash_to_range(t1, low, high)
if clip_min_stddev is None:
low = -np.inf
else:
low = tf.math.log(tf.exp(clip_min_stddev) - 1.0)
if clip_max_stddev is None:
high = np.inf
else:
high = tf.math.log(tf.exp(clip_max_stddev) - 1.0)
t2 = rpc_utils.squash_to_range(t2, low, high)
return tf.concat([t1, t2], axis=1)
if use_identity_encoder:
assert latent_dim == observation_spec.shape[0]
obs_input = tf.keras.layers.Input(observation_spec.shape)
zeros = 0.0 * obs_input[:, :1]
stddev_dim = 1 if identity_encoder_single_stddev else latent_dim
pre_stddev = tf.keras.layers.Dense(stddev_dim,
activation=None)(zeros)
ones = zeros + tf.ones((1, latent_dim))
pre_stddev = pre_stddev * ones # Multiply to broadcast to latent_dim.
pre_mean_stddev = tf.concat([obs_input, pre_stddev], axis=1)
output = tfp.layers.IndependentNormal(latent_dim)(pre_mean_stddev)
encoder_net = tf.keras.Model(inputs=obs_input, outputs=output)
else:
encoder_net = tf.keras.Sequential([
tf.keras.layers.Dense(256, activation='relu'),
tf.keras.layers.Dense(256, activation='relu'),
tf.keras.layers.Dense(
tfp.layers.IndependentNormal.params_size(latent_dim),
activation=_activation,
kernel_initializer='glorot_uniform'),
tfp.layers.IndependentNormal(latent_dim),
])
# Build the predictor net
obs_input = tf.keras.layers.Input(observation_spec.shape)
action_input = tf.keras.layers.Input(action_spec.shape)
class ConstantIndependentNormal(tfp.layers.IndependentNormal):
"""A keras layer that always returns N(0, 1) distribution."""
def call(self, inputs):
loc_scale = tf.concat([
tf.zeros((latent_dim, )),
tf.fill((latent_dim, ), tf.math.log(tf.exp(1.0) - 1))
],
axis=0)
# Multiple by [B x 1] tensor to broadcast batch dimension.
loc_scale = loc_scale * tf.ones_like(inputs[:, :1])
return super(ConstantIndependentNormal, self).call(loc_scale)
if predict_prior:
z = encoder_net(obs_input)
if not predictor_updates_encoder:
z = tf.stop_gradient(z)
za = tf.concat([z, action_input], axis=1)
if use_residual_predictor:
za_input = tf.keras.layers.Input(za.shape[1])
loc_scale = tf.keras.Sequential(
predictor_num_layers *
[tf.keras.layers.Dense(256, activation='relu')] + [ # pylint: disable=line-too-long
tf.keras.layers.Dense(tfp.layers.IndependentNormal.
params_size(latent_dim),
activation=_activation,
kernel_initializer='zeros'),
])(za_input)
if predict_prior_std:
combined_loc_scale = tf.concat([
loc_scale[:, :latent_dim] + za_input[:, :latent_dim],
loc_scale[:, latent_dim:]
],
axis=1)
else:
# Note that softplus(log(e - 1)) = 1.
combined_loc_scale = tf.concat([
loc_scale[:, :latent_dim] + za_input[:, :latent_dim],
tf.math.log(np.e - 1) *
tf.ones_like(loc_scale[:, latent_dim:])
],
axis=1)
dist = tfp.layers.IndependentNormal(latent_dim)(
combined_loc_scale)
output = tf.keras.Model(inputs=za_input, outputs=dist)(za)
else:
assert predict_prior_std
output = tf.keras.Sequential(
predictor_num_layers *
[tf.keras.layers.Dense(256, activation='relu')] + # pylint: disable=line-too-long
[
tf.keras.layers.Dense(tfp.layers.IndependentNormal.
params_size(latent_dim),
activation=_activation,
kernel_initializer='zeros'),
tfp.layers.IndependentNormal(latent_dim),
])(za)
else:
# scale is chosen by inverting the softplus function to equal 1.
if len(obs_input.shape) > 2:
input_reshaped = tf.reshape(
obs_input,
[-1, tf.math.reduce_prod(obs_input.shape[1:])])
# Multiply by [B x 1] tensor to broadcast batch dimension.
za = tf.zeros(latent_dim + action_spec.shape[0], ) * tf.ones_like(input_reshaped[:, :1]) # pylint: disable=line-too-long
else:
# Multiple by [B x 1] tensor to broadcast batch dimension.
za = tf.zeros(latent_dim + action_spec.shape[0], ) * tf.ones_like(obs_input[:, :1]) # pylint: disable=line-too-long
output = tf.keras.Sequential([
ConstantIndependentNormal(latent_dim),
])(za)
predictor_net = tf.keras.Model(inputs=(obs_input, action_input),
outputs=output)
if use_recurrent_actor:
ActorClass = rpc_utils.RecurrentActorNet # pylint: disable=invalid-name
else:
ActorClass = rpc_utils.ActorNet # pylint: disable=invalid-name
actor_net = ActorClass(input_tensor_spec=observation_spec,
output_tensor_spec=action_spec,
encoder=encoder_net,
predictor=predictor_net,
fc_layers=actor_fc_layers)
critic_net = rpc_utils.CriticNet(
(observation_spec, action_spec),
observation_fc_layer_params=critic_obs_fc_layers,
action_fc_layer_params=critic_action_fc_layers,
joint_fc_layer_params=critic_joint_fc_layers,
kernel_initializer='glorot_uniform',
last_kernel_initializer='glorot_uniform')
critic_net_2 = None
target_critic_net_1 = None
target_critic_net_2 = None
tf_agent = rpc_agent.RpAgent(
time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
critic_network_2=critic_net_2,
target_critic_network=target_critic_net_1,
target_critic_network_2=target_critic_net_2,
actor_optimizer=tf.compat.v1.train.AdamOptimizer(
learning_rate=actor_learning_rate),
critic_optimizer=tf.compat.v1.train.AdamOptimizer(
learning_rate=critic_learning_rate),
alpha_optimizer=tf.compat.v1.train.AdamOptimizer(
learning_rate=alpha_learning_rate),
target_update_tau=target_update_tau,
target_update_period=target_update_period,
td_errors_loss_fn=td_errors_loss_fn,
gamma=gamma,
reward_scale_factor=reward_scale_factor,
gradient_clipping=gradient_clipping,
debug_summaries=debug_summaries,
summarize_grads_and_vars=summarize_grads_and_vars,
train_step_counter=global_step)
dual_optimizer = tf.compat.v1.train.AdamOptimizer(
learning_rate=dual_learning_rate)
tf_agent.initialize()
# Make the replay buffer.
replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
data_spec=tf_agent.collect_data_spec,
batch_size=tf_env.batch_size,
max_length=replay_buffer_capacity)
replay_observer = [replay_buffer.add_batch]
train_metrics = [
tf_metrics.NumberOfEpisodes(),
tf_metrics.EnvironmentSteps(),
tf_metrics.AverageReturnMetric(buffer_size=num_eval_episodes,
batch_size=tf_env.batch_size),
tf_metrics.AverageEpisodeLengthMetric(
buffer_size=num_eval_episodes, batch_size=tf_env.batch_size),
]
kl_metric = rpc_utils.AverageKLMetric(encoder=encoder_net,
predictor=predictor_net,
batch_size=tf_env.batch_size)
eval_policy = greedy_policy.GreedyPolicy(tf_agent.policy)
initial_collect_policy = random_tf_policy.RandomTFPolicy(
tf_env.time_step_spec(), tf_env.action_spec())
collect_policy = tf_agent.collect_policy
checkpoint_items = {
'ckpt_dir': train_dir,
'agent': tf_agent,
'global_step': global_step,
'metrics': metric_utils.MetricsGroup(train_metrics,
'train_metrics'),
'dual_optimizer': dual_optimizer,
}
train_checkpointer = common.Checkpointer(**checkpoint_items)
policy_checkpointer = common.Checkpointer(ckpt_dir=os.path.join(
train_dir, 'policy'),
policy=eval_policy,
global_step=global_step)
rb_checkpointer = common.Checkpointer(ckpt_dir=os.path.join(
train_dir, 'replay_buffer'),
max_to_keep=1,
replay_buffer=replay_buffer)
train_checkpointer.initialize_or_restore()
rb_checkpointer.initialize_or_restore()
initial_collect_driver = dynamic_step_driver.DynamicStepDriver(
tf_env,
initial_collect_policy,
observers=replay_observer + train_metrics,
num_steps=initial_collect_steps,
transition_observers=[kl_metric])
collect_driver = dynamic_step_driver.DynamicStepDriver(
tf_env,
collect_policy,
observers=replay_observer + train_metrics,
num_steps=collect_steps_per_iteration,
transition_observers=[kl_metric])
if use_tf_functions:
initial_collect_driver.run = common.function(
initial_collect_driver.run)
collect_driver.run = common.function(collect_driver.run)
tf_agent.train = common.function(tf_agent.train)
if replay_buffer.num_frames() == 0:
# Collect initial replay data.
logging.info(
'Initializing replay buffer by collecting experience for %d steps '
'with a random policy.', initial_collect_steps)
initial_collect_driver.run()
for name, eval_tf_env, eval_metrics in eval_vec:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='Metrics-%s' % name,
)
if eval_metrics_callback is not None:
eval_metrics_callback(results, global_step.numpy())
metric_utils.log_metrics(eval_metrics, prefix=name)
time_step = None
policy_state = collect_policy.get_initial_state(tf_env.batch_size)
timed_at_step = global_step.numpy()
time_acc = 0
train_time_acc = 0
env_time_acc = 0
if use_recurrent_actor: # default from sac/train_eval_rnn.py
num_steps = rnn_sequence_length + 1
def _filter_invalid_transition(trajectories, unused_arg1):
return tf.reduce_all(~trajectories.is_boundary()[:-1])
tf_agent._as_transition = data_converter.AsTransition( # pylint: disable=protected-access
tf_agent.data_context,
squeeze_time_dim=False)
else:
num_steps = 2
def _filter_invalid_transition(trajectories, unused_arg1):
return ~trajectories.is_boundary()[0]
dataset = replay_buffer.as_dataset(
sample_batch_size=batch_size,
num_steps=num_steps).unbatch().filter(_filter_invalid_transition)
dataset = dataset.batch(batch_size).prefetch(5)
# Dataset generates trajectories with shape [Bx2x...]
iterator = iter(dataset)
@tf.function
def train_step():
experience, _ = next(iterator)
prior = predictor_net(
(experience.observation[:, 0], experience.action[:, 0]),
training=False)
z_next = encoder_net(experience.observation[:, 1], training=False)
# predictor_kl is a vector of size batch_size.
predictor_kl = tfp.distributions.kl_divergence(z_next, prior)
with tf.GradientTape() as tape:
tape.watch(actor_net._log_kl_coefficient) # pylint: disable=protected-access
dual_loss = -1.0 * actor_net._log_kl_coefficient * ( # pylint: disable=protected-access
tf.stop_gradient(tf.reduce_mean(predictor_kl)) -
kl_constraint)
dual_grads = tape.gradient(dual_loss,
[actor_net._log_kl_coefficient]) # pylint: disable=protected-access
grads_and_vars = list(
zip(dual_grads, [actor_net._log_kl_coefficient])) # pylint: disable=protected-access
dual_optimizer.apply_gradients(grads_and_vars)
# Clip the dual variable so exp(log_kl_coef) <= 1e6.
log_kl_coef = tf.clip_by_value(
actor_net._log_kl_coefficient, # pylint: disable=protected-access
-1.0 * np.log(1e6),
np.log(1e6))
actor_net._log_kl_coefficient.assign(log_kl_coef) # pylint: disable=protected-access
with tf.name_scope('dual_loss'):
tf.compat.v2.summary.scalar(name='dual_loss',
data=tf.reduce_mean(dual_loss),
step=global_step)
tf.compat.v2.summary.scalar(
name='log_kl_coefficient',
data=actor_net._log_kl_coefficient, # pylint: disable=protected-access
step=global_step)
z_entropy = z_next.entropy()
log_prob = prior.log_prob(z_next.sample())
with tf.name_scope('rp-metrics'):
common.generate_tensor_summaries('predictor_kl', predictor_kl,
global_step)
common.generate_tensor_summaries('z_entropy', z_entropy,
global_step)
common.generate_tensor_summaries('log_prob', log_prob,
global_step)
common.generate_tensor_summaries('z_mean', z_next.mean(),
global_step)
common.generate_tensor_summaries('z_stddev', z_next.stddev(),
global_step)
common.generate_tensor_summaries('prior_mean', prior.mean(),
global_step)
common.generate_tensor_summaries('prior_stddev',
prior.stddev(), global_step)
if log_prob_reward_scale == 'auto':
coef = tf.stop_gradient(tf.exp(actor_net._log_kl_coefficient)) # pylint: disable=protected-access
else:
coef = log_prob_reward_scale
tf.debugging.check_numerics(tf.reduce_mean(predictor_kl),
'predictor_kl is inf or nan.')
tf.debugging.check_numerics(coef, 'coef is inf or nan.')
new_reward = experience.reward - coef * predictor_kl[:, None]
experience = experience._replace(reward=new_reward)
return tf_agent.train(experience)
if use_tf_functions:
train_step = common.function(train_step)
# Save the hyperparameters
operative_filename = os.path.join(root_dir, 'operative.gin')
with tf.compat.v1.gfile.Open(operative_filename, 'w') as f:
f.write(gin.operative_config_str())
print(gin.operative_config_str())
global_step_val = global_step.numpy()
while global_step_val < num_iterations:
start_time = time.time()
time_step, policy_state = collect_driver.run(
time_step=time_step,
policy_state=policy_state,
)
env_time_acc += time.time() - start_time
train_start_time = time.time()
for _ in range(train_steps_per_iteration):
train_loss = train_step()
train_time_acc += time.time() - train_start_time
time_acc += time.time() - start_time
global_step_val = global_step.numpy()
if global_step_val % log_interval == 0:
logging.info('step = %d, loss = %f', global_step_val,
train_loss.loss)
steps_per_sec = (global_step_val - timed_at_step) / time_acc
logging.info('%.3f steps/sec', steps_per_sec)
tf.compat.v2.summary.scalar(name='global_steps_per_sec',
data=steps_per_sec,
step=global_step)
train_steps_per_sec = (global_step_val -
timed_at_step) / train_time_acc
logging.info('Train: %.3f steps/sec', train_steps_per_sec)
tf.compat.v2.summary.scalar(name='train_steps_per_sec',
data=train_steps_per_sec,
step=global_step)
env_steps_per_sec = (global_step_val -
timed_at_step) / env_time_acc
logging.info('Env: %.3f steps/sec', env_steps_per_sec)
tf.compat.v2.summary.scalar(name='env_steps_per_sec',
data=env_steps_per_sec,
step=global_step)
timed_at_step = global_step_val
time_acc = 0
train_time_acc = 0
env_time_acc = 0
for train_metric in train_metrics + [kl_metric]:
train_metric.tf_summaries(train_step=global_step,
step_metrics=train_metrics[:2])
if global_step_val % eval_interval == 0:
start_time = time.time()
for name, eval_tf_env, eval_metrics in eval_vec:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='Metrics-%s' % name,
)
if eval_metrics_callback is not None:
eval_metrics_callback(results, global_step_val)
metric_utils.log_metrics(eval_metrics, prefix=name)
logging.info('Evaluation: %d min',
(time.time() - start_time) / 60)
for prob_dropout in eval_dropout:
rpc_utils.eval_dropout_fn(eval_tf_env,
actor_net,
global_step,
prob_dropout=prob_dropout)
if global_step_val % train_checkpoint_interval == 0:
train_checkpointer.save(global_step=global_step_val)
if global_step_val % policy_checkpoint_interval == 0:
policy_checkpointer.save(global_step=global_step_val)
if global_step_val % rb_checkpoint_interval == 0:
rb_checkpointer.save(global_step=global_step_val)
def angle_cls_focal_loss(self,
labels,
pred,
anchor_state,
alpha=None,
gamma=2.0,
decimal_weight=None):
indices = tf.reshape(tf.where(tf.equal(anchor_state, 1)), [
-1,
])
labels = tf.gather(labels, indices)
pred = tf.gather(pred, indices)
anchor_state = tf.gather(anchor_state, indices)
# compute the focal loss
per_entry_cross_ent = - labels * tf.log(tf.sigmoid(pred) + self.cfgs.EPSILON) \
- (1 - labels) * tf.log(1 - tf.sigmoid(pred) + self.cfgs.EPSILON)
prediction_probabilities = tf.sigmoid(pred)
p_t = ((labels * prediction_probabilities) +
((1 - labels) * (1 - prediction_probabilities)))
modulating_factor = 1.0
if gamma:
modulating_factor = tf.pow(1.0 - p_t, gamma)
alpha_weight_factor = 1.0
if alpha is not None:
alpha_weight_factor = (labels * alpha + (1 - labels) * (1 - alpha))
if decimal_weight is not None:
angle_decode_labels = tf.py_func(func=angle_label_decode,
inp=[
labels, self.cfgs.ANGLE_RANGE,
self.cfgs.OMEGA,
self.cfgs.ANGLE_MODE
],
Tout=[tf.float32])
angle_decode_labels = tf.reshape(angle_decode_labels, [
-1,
]) * -1
angle_decode_pred = tf.py_func(func=angle_label_decode,
inp=[
tf.sigmoid(pred),
self.cfgs.ANGLE_RANGE,
self.cfgs.OMEGA,
self.cfgs.ANGLE_MODE
],
Tout=[tf.float32])
angle_decode_pred = tf.reshape(angle_decode_pred, [
-1,
]) * -1
diff_weight = tf.reshape(
tf.log(abs(angle_decode_labels - angle_decode_pred) + 1),
[-1, 1])
else:
diff_weight = tf.ones_like(tf.reshape(anchor_state, [-1, 1]))
focal_cross_entropy_loss = (diff_weight * modulating_factor *
alpha_weight_factor * per_entry_cross_ent)
# compute the normalizer: the number of positive anchors
# normalizer = tf.stop_gradient(tf.where(tf.greater(anchor_state, -2)))
normalizer = tf.stop_gradient(tf.where(tf.equal(anchor_state, 1)))
normalizer = tf.cast(tf.shape(normalizer)[0], tf.float32)
normalizer = tf.maximum(1.0, normalizer)
# normalizer = tf.stop_gradient(tf.cast(tf.equal(anchor_state, 1), tf.float32))
# normalizer = tf.maximum(tf.reduce_sum(normalizer), 1)
return tf.reduce_sum(focal_cross_entropy_loss) / normalizer
def loss(self, predictions, policy, cfv):
r = tf.stop_gradient(
cpea.rm_policy(cfv -
tf.reduce_sum(cfv * policy, axis=1, keepdims=True)))
error = tf.square(r - predictions) / 2.0
return tf.reduce_mean(tf.reduce_sum(error, axis=1))
def model_fn(features, labels, mode, params):
'''
Args:
features: tensor with shape
[BATCH_SIZE, go.N, go.N, features_lib.NEW_FEATURES_PLANES]
labels: dict from string to tensor with shape
'pi_tensor': [BATCH_SIZE, go.N * go.N + 1]
'value_tensor': [BATCH_SIZE]
mode: a tf.estimator.ModeKeys (batchnorm params update for TRAIN only)
params: A dictionary (Typically derived from the FLAGS object.)
Returns: tf.estimator.EstimatorSpec with props
mode: same as mode arg
predictions: dict of tensors
'policy': [BATCH_SIZE, go.N * go.N + 1]
'value': [BATCH_SIZE]
loss: a single value tensor
train_op: train op
eval_metric_ops
return dict of tensors
logits: [BATCH_SIZE, go.N * go.N + 1]
'''
policy_output, value_output, logits = model_inference_fn(
features, mode == tf.estimator.ModeKeys.TRAIN, params)
# train ops
policy_cost = tf.reduce_mean(
tf.nn.softmax_cross_entropy_with_logits_v2(logits=logits,
labels=tf.stop_gradient(
labels['pi_tensor'])))
value_cost = params['value_cost_weight'] * tf.reduce_mean(
tf.square(value_output - labels['value_tensor']))
reg_vars = [
v for v in tf.trainable_variables()
if 'bias' not in v.name and 'beta' not in v.name
]
l2_cost = params['l2_strength'] * \
tf.add_n([tf.nn.l2_loss(v) for v in reg_vars])
combined_cost = policy_cost + value_cost + l2_cost
global_step = tf.train.get_or_create_global_step()
learning_rate = tf.train.piecewise_constant(global_step,
params['lr_boundaries'],
params['lr_rates'])
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
# Insert quantization ops if requested
if params['quantize']:
if mode == tf.estimator.ModeKeys.TRAIN:
tf.contrib.quantize.create_training_graph(
quant_delay=params['quant_delay'])
else:
tf.contrib.quantize.create_eval_graph()
optimizer = tf.train.MomentumOptimizer(learning_rate,
params['sgd_momentum'])
if params['use_tpu']:
optimizer = tpu_optimizer.CrossShardOptimizer(optimizer)
with tf.control_dependencies(update_ops):
train_op = optimizer.minimize(combined_cost, global_step=global_step)
# Computations to be executed on CPU, outside of the main TPU queues.
def eval_metrics_host_call_fn(policy_output,
value_output,
pi_tensor,
policy_cost,
value_cost,
l2_cost,
combined_cost,
step,
est_mode=tf.estimator.ModeKeys.TRAIN):
policy_entropy = -tf.reduce_mean(
tf.reduce_sum(policy_output * tf.log(policy_output), axis=1))
# pi_tensor is one_hot when generated from sgfs (for supervised learning)
# and soft-max when using self-play records. argmax normalizes the two.
policy_target_top_1 = tf.argmax(pi_tensor, axis=1)
policy_output_in_top1 = tf.to_float(
tf.nn.in_top_k(policy_output, policy_target_top_1, k=1))
policy_output_in_top3 = tf.to_float(
tf.nn.in_top_k(policy_output, policy_target_top_1, k=3))
policy_top_1_confidence = tf.reduce_max(policy_output, axis=1)
policy_target_top_1_confidence = tf.boolean_mask(
policy_output,
tf.one_hot(policy_target_top_1,
tf.shape(policy_output)[1]))
with tf.variable_scope("metrics"):
metric_ops = {
'policy_cost':
tf.metrics.mean(policy_cost),
'value_cost':
tf.metrics.mean(value_cost),
'l2_cost':
tf.metrics.mean(l2_cost),
'policy_entropy':
tf.metrics.mean(policy_entropy),
'combined_cost':
tf.metrics.mean(combined_cost),
'policy_accuracy_top_1':
tf.metrics.mean(policy_output_in_top1),
'policy_accuracy_top_3':
tf.metrics.mean(policy_output_in_top3),
'policy_top_1_confidence':
tf.metrics.mean(policy_top_1_confidence),
'policy_target_top_1_confidence':
tf.metrics.mean(policy_target_top_1_confidence),
'value_confidence':
tf.metrics.mean(tf.abs(value_output)),
}
if est_mode == tf.estimator.ModeKeys.EVAL:
return metric_ops
# NOTE: global_step is rounded to a multiple of FLAGS.summary_steps.
eval_step = tf.reduce_min(step)
# Create summary ops so that they show up in SUMMARIES collection
# That way, they get logged automatically during training
summary_writer = summary.create_file_writer(FLAGS.work_dir)
with summary_writer.as_default(), \
summary.record_summaries_every_n_global_steps(
params['summary_steps'], eval_step):
for metric_name, metric_op in metric_ops.items():
summary.scalar(metric_name, metric_op[1], step=eval_step)
# Reset metrics occasionally so that they are mean of recent batches.
reset_op = tf.variables_initializer(tf.local_variables("metrics"))
cond_reset_op = tf.cond(
tf.equal(eval_step % params['summary_steps'], tf.to_int64(1)),
lambda: reset_op, lambda: tf.no_op())
return summary.all_summary_ops() + [cond_reset_op]
metric_args = [
policy_output,
value_output,
labels['pi_tensor'],
tf.reshape(policy_cost, [1]),
tf.reshape(value_cost, [1]),
tf.reshape(l2_cost, [1]),
tf.reshape(combined_cost, [1]),
tf.reshape(global_step, [1]),
]
predictions = {
'policy_output': policy_output,
'value_output': value_output,
}
eval_metrics_only_fn = functools.partial(
eval_metrics_host_call_fn, est_mode=tf.estimator.ModeKeys.EVAL)
host_call_fn = functools.partial(eval_metrics_host_call_fn,
est_mode=tf.estimator.ModeKeys.TRAIN)
tpu_estimator_spec = tpu_estimator.TPUEstimatorSpec(
mode=mode,
predictions=predictions,
loss=combined_cost,
train_op=train_op,
eval_metrics=(eval_metrics_only_fn, metric_args),
host_call=(host_call_fn, metric_args))
if params['use_tpu']:
return tpu_estimator_spec
else:
return tpu_estimator_spec.as_estimator_spec()
# Selective softmax
extractor = np.zeros((action_space_dimension, asize), dtype=np.float32)
for i, a in enumerate(actionset):
extractor[a, i] = 1.0
adaptor = np.transpose(extractor)
compact = tf.tensordot(raw_pi, extractor, [[2], [0]])
compact_softmax = tf.nn.softmax(compact)
softmax_policy = tf.tensordot(compact_softmax, adaptor, [[2], [0]])
# build loss
flattened_value = tf.reshape(raw_value, [-1])
policy = tf.multiply(softmax_policy, action_tensor)
policy = tf.reduce_sum(policy, axis=[1, 2])
log_policy = tf.log(tf.clip_by_value(policy, 1e-20, 1.0))
criticism = V_tensor - flattened_value
policy_per_sample = log_policy * tf.stop_gradient(criticism)
policy_loss = tf.reduce_sum(-policy_per_sample)
value_loss = tf.nn.l2_loss(criticism)
loss = policy_loss + value_loss
optimizer = tf.train.AdamOptimizer(learning_rate=1e-3)
grad_op = optimizer.compute_gradients(loss)
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
dic = {
action_tensor: actions_to_adist_array([3], action_space_dimension),
V_tensor: [10.0],
}
grad = sess.run(grad_op, feed_dict=dic)
print("grad 1\n{}".format(grad))
def NN_hidden(currentstate):
hidden = tf.nn.relu(tf.matmul(currentstate, w['L1']))
out = tf.matmul(hidden, w['L2'])
return out
# Bellmans equations
# G_O is 0 if game over, 1 otherwise
G_O = rew + 1
# predictions
# next state
Qnext = tf.reshape(tf.reduce_max(NN_hidden(posteriorstate)), [-1, 1])
Qnext = tf.multiply(G_O, Qnext) # 0 if G_0 is 0
# current state
Q = tf.reshape(tf.gather_nd(NN_hidden(currentstate), action), [-1, 1])
delt = rew + (discount_factor * tf.stop_gradient(Qnext)) - Q
# LOSS/TRAINING DEFINITIONS
loss = tf.multiply(0.50, tf.reduce_mean(tf.square(delt)), name="loss")
# RMSprop parameters
rmsprop_dec = 0.937 # RMSprop decay
rmsprop_mom = 0.52 # RMSprop momentum
# RMSprop optimisation
train = tf.train.RMSPropOptimizer(learning_rate=learningrate,
momentum=rmsprop_mom,
decay=rmsprop_dec).minimize(loss)
prediction = tf.argmax((NN_hidden(currentstate)), axis=1)
# variable initialisation
init = tf.global_variables_initializer()
# saving functionality
saver = tf.train.Saver()
# TRAINING
def __init__(self, action_size, img_h, img_w, n_channels, c1, epochs, batch_size):
self.epochs = epochs
self.batch_size = batch_size
self.regularizer = None #tf.contrib.layers.l2_regularizer(scale=0.001)
self.initializer = None
# counters for wrinting summaries to tensorboard
self.i = 0 # overall training
self.update_r = 0 # reward
self.action_size = action_size
self.sess = tf.Session()
with tf.variable_scope("model"):
# Placeholders Model
self.o_t = tf.placeholder(shape=[None, img_h, img_w, n_channels], dtype=tf.float32)
#self.o_t = self.o_t / 255.
# Placeholders PPO
self.action = tf.placeholder(shape=[self.batch_size], dtype=tf.int32)
self.V_targ = tf.placeholder(shape=[self.batch_size], dtype=tf.float32)
self.advantage = tf.placeholder(shape=[self.batch_size], dtype=tf.float32)
# Placeholders summaries
self.reward = tf.placeholder(shape=(), dtype=tf.float32)
# Placeholders for Training
self.lr = tf.placeholder(shape=(), dtype=tf.float32)
self.lr_v = tf.placeholder(shape=(), dtype=tf.float32)
self.epsilon = tf.placeholder(shape=(), dtype=tf.float32)
self.c2 = tf.placeholder(shape=(), dtype=tf.float32)
# constants
self.n = tf.constant(self.action_size, dtype=tf.float32)
self.c1 = tf.constant(c1)
self.pi_greco = tf.constant(math.pi)
# Define models
self.V, self.pi = self.build_model("new")
_, self.pi_old = self.build_model("old")
# Compute Probability of the action taken in log space
self.action_taken_one_hot = tf.one_hot(self.action, self.action_size)
self.pi_sampled_log = tf.log(tf.reduce_sum(self.pi * self.action_taken_one_hot, -1) + 1e-5)
self.pi_old_sampled_log = tf.log(tf.reduce_sum(self.pi_old * self.action_taken_one_hot, -1) + 1e-5)
# PPO Loss
self.ratio = tf.exp(self.pi_sampled_log - tf.stop_gradient(self.pi_old_sampled_log))
self.sur1 = tf.multiply(self.ratio, self.advantage)
self.sur2 = tf.multiply(tf.clip_by_value(self.ratio, 1.0 - self.epsilon, 1.0 + self.epsilon), self.advantage)
self.L_CLIP = tf.reduce_mean(tf.minimum(self.sur1, self.sur2))
self.L_V = 0.5 * tf.reduce_mean(tf.squared_difference(self.V_targ, self.V))
self.entropy = - tf.reduce_sum(self.pi * tf.log(self.pi))
self.loss = - self.L_CLIP + self.c1 * self.L_V - self.c2 * self.entropy
# Training summaries
self.s_pi = tf.summary.scalar('pi', tf.reduce_mean(tf.exp(self.pi_sampled_log)))
self.s_ratio = tf.summary.scalar('Ratio', tf.reduce_mean(self.ratio))
self.s_v = tf.summary.scalar('Loss_V', self.L_V)
self.s_c = tf.summary.scalar('Loss_CLIP', -self.L_CLIP)
self.s_e = tf.summary.scalar('Loss_entropy', -self.entropy)
self.merge = tf.summary.merge([self.s_pi, self.s_ratio, self.s_v, self.s_c, self.s_e])
self.s_r = tf.summary.scalar('Reward', self.reward)
# Optimization steps
self.optimizer = tf.train.AdamOptimizer(self.lr)
self.train_ppo = self.optimizer.minimize(self.loss)
self.optimizer_v = tf.train.AdamOptimizer(self.lr_v)
self.train_ppo_v = self.optimizer_v.minimize(self.L_V)
with tf.variable_scope("assign"):
self.assign_arr = []
self.col_dict = {}
self.col1 = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope='model/new')
for i in range(len(self.col1)):
self.col_dict[self.col1[i].name.split('/')[-2] + "/" + self.col1[i].name.split('/')[-1]] = self.col1[i]
self.col2 = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, scope='model/old')
for i in range(len(self.col2)):
self.node_name = self.col2[i].name.split('/')[-2] + "/" + self.col2[i].name.split('/')[-1]
self.assign0 = self.col2[i].assign(self.col_dict[self.node_name])
self.assign_arr.append(self.assign0)
self.init = tf.global_variables_initializer()
self.sess.run(self.init)
self.train_writer = tf.summary.FileWriter('train/', self.sess.graph)
def _build_critic(self, tensors, v_bonus, q_bonus, output_dim=1, hidden_dim=64, total_loss=False):
"""
:param placeholders: [obs_ph, action_ph, next_obs_ph, terminal_ph, action_pi, ensemble_mask]
:param v_bonus: is used to compute v_backup (for reward value: v_bonus=0, kl_value: v_bonus=-kl)
:param q_bonus: is used to compute q_backup (for reward_value: q_bonus=r, kl_value: q_bonus=0)
:param output_dim: integer
:return: critic_v, critic_q, mean(q_losses), qs_pi, critic_train_op, target_update_op
"""
obs_ph, action_ph, next_obs_ph, terminal_ph, action_pi, ensemble_mask = tensors
# Define V and Q networks
critic_v = VNetwork(output_dim, hidden_dim=hidden_dim)
critic_q = QNetwork(output_dim, self.num_critics, hidden_dim=hidden_dim)
critic_v_target = VNetwork(output_dim, hidden_dim=hidden_dim)
# Critic training (V, Q)
qs_pi = critic_q([obs_ph, action_pi])
v = critic_v([obs_ph])
qs = critic_q([obs_ph, action_ph])
v_backup = tf.stop_gradient(self._reduce_q(qs_pi) + v_bonus)
v_loss = tf.losses.mean_squared_error(v_backup, v)
if total_loss and output_dim != 1:
print('total_loss_added')
v_loss = v_loss * output_dim + tf.losses.mean_squared_error(tf.reduce_sum(v_backup, axis=-1, keepdims=True), tf.reduce_sum(v, axis=-1, keepdims=True))
# Gradient panelty (V)
if self.gradient_norm_panelty > 0:
v_grad_obs = tf.gradients(v, [obs_ph])[0] # do not average, sum by the output dimension
v_grad_norm = tf.sqrt(tf.reduce_sum(tf.square(v_grad_obs), axis=1) + 1e-8)
v_grad_panelty_loss = tf.reduce_mean(tf.maximum(v_grad_norm - self.gradient_norm_limit * np.sqrt(self.state_dim), 0) ** 2)
v_loss += self.gradient_norm_panelty * v_grad_panelty_loss
value_target = critic_v_target([next_obs_ph])
q_backup = tf.stop_gradient((1 - terminal_ph) * self.gamma * value_target + q_bonus) # batch x 1
q_losses = [tf.losses.mean_squared_error(q_backup, qs[k], weights=ensemble_mask[:, k:k+1]) for k in range(self.num_critics)]
if total_loss and output_dim != 1:
for k in range(self.num_critics):
q_losses[k] = q_losses[k] * output_dim + tf.losses.mean_squared_error(
tf.reduce_sum(q_backup, axis=-1, keepdims=True), tf.reduce_sum(qs[k], axis=-1, keepdims=True), weights=ensemble_mask[:, k:k+1])
# Gradient panelty (Q)
if self.gradient_norm_panelty > 0:
qs_grad_obs_action = [tf.concat(tf.gradients(q, [obs_ph, action_ph]), axis=-1) for q in qs] # do not average, sum by the output dimension
qs_grad_norm = [tf.sqrt(tf.reduce_sum(tf.square(q_grad_obs_action), axis=1) + 1e-8) for q_grad_obs_action in qs_grad_obs_action]
qs_grad_panelty_loss = [tf.reduce_mean(tf.maximum(q_grad_norm - self.gradient_norm_limit * np.sqrt(self.state_dim + self.action_dim), 0) ** 2) for q_grad_norm in qs_grad_norm]
for i, q_grad_panelty_loss in enumerate(qs_grad_panelty_loss):
q_losses[i] += self.gradient_norm_panelty * q_grad_panelty_loss
value_loss = v_loss + tf.reduce_sum(q_losses)
critic_optimizer = tf.train.AdamOptimizer(self.learning_rate)
critic_train_op = critic_optimizer.minimize(value_loss, var_list=critic_v.trainable_variables + critic_q.trainable_variables)
with tf.control_dependencies([critic_train_op]):
# Update target network
source_params = critic_v.trainable_variables
target_params = critic_v_target.trainable_variables
target_update_op = [
tf.assign(target, (1 - self.tau) * target + self.tau * source)
for target, source in zip(target_params, source_params)
]
# Copy weights to target networks
self.sess.run(tf.variables_initializer(critic_optimizer.variables()))
critic_v_target.set_weights(critic_v.get_weights())
return critic_v, critic_q, tf.reduce_mean(q_losses), qs_pi, critic_train_op, target_update_op
def build_train(make_obs_ph,
q_func,
num_actions,
optimizer,
grad_norm_clipping=None,
gamma=1.0,
double_q=True,
scope="deepq",
reuse=None,
param_noise=False,
param_noise_filter_func=None):
"""Creates the train function:
Parameters
----------
make_obs_ph: str -> tf.placeholder or TfInput
a function that takes a name and creates a placeholder of input with that name
q_func: (tf.Variable, int, str, bool) -> tf.Variable
the model that takes the following inputs:
observation_in: object
the output of observation placeholder
num_actions: int
number of actions
scope: str
reuse: bool
should be passed to outer variable scope
and returns a tensor of shape (batch_size, num_actions) with values of every action.
num_actions: int
number of actions
reuse: bool
whether or not to reuse the graph variables
optimizer: tf.train.Optimizer
optimizer to use for the Q-learning objective.
grad_norm_clipping: float or None
clip gradient norms to this value. If None no clipping is performed.
gamma: float
discount rate.
double_q: bool
if true will use Double Q Learning (https://arxiv.org/abs/1509.06461).
In general it is a good idea to keep it enabled.
scope: str or VariableScope
optional scope for variable_scope.
reuse: bool or None
whether or not the variables should be reused. To be able to reuse the scope must be given.
param_noise: bool
whether or not to use parameter space noise (https://arxiv.org/abs/1706.01905)
param_noise_filter_func: tf.Variable -> bool
function that decides whether or not a variable should be perturbed. Only applicable
if param_noise is True. If set to None, default_param_noise_filter is used by default.
Returns
-------
act: (tf.Variable, bool, float) -> tf.Variable
function to select and action given observation.
` See the top of the file for details.
train: (object, np.array, np.array, object, np.array, np.array) -> np.array
optimize the error in Bellman's equation.
` See the top of the file for details.
update_target: () -> ()
copy the parameters from optimized Q function to the target Q function.
` See the top of the file for details.
debug: {str: function}
a bunch of functions to print debug data like q_values.
"""
if param_noise:
act_f = build_act_with_param_noise(
make_obs_ph,
q_func,
num_actions,
scope=scope,
reuse=reuse,
param_noise_filter_func=param_noise_filter_func)
else:
act_f = build_act(make_obs_ph,
q_func,
num_actions,
scope=scope,
reuse=reuse)
with tf.variable_scope(scope, reuse=reuse):
# set up placeholders
obs_t_input = make_obs_ph("obs_t")
act_t_ph = tf.placeholder(tf.int32, [None], name="action")
rew_t_ph = tf.placeholder(tf.float32, [None], name="reward")
obs_tp1_input = make_obs_ph("obs_tp1")
done_mask_ph = tf.placeholder(tf.float32, [None], name="done")
importance_weights_ph = tf.placeholder(tf.float32, [None],
name="weight")
# q network evaluation
q_t = q_func(obs_t_input.get(),
num_actions,
scope="q_func",
reuse=True) # reuse parameters from act
q_func_vars = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
scope=tf.get_variable_scope().name +
"/q_func")
# target q network evalution
q_tp1 = q_func(obs_tp1_input.get(), num_actions, scope="target_q_func")
target_q_func_vars = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES,
scope=tf.get_variable_scope().name + "/target_q_func")
# q scores for actions which we know were selected in the given state.
q_t_selected = tf.reduce_sum(q_t * tf.one_hot(act_t_ph, num_actions),
1)
# compute estimate of best possible value starting from state at t + 1
if double_q:
q_tp1_using_online_net = q_func(obs_tp1_input.get(),
num_actions,
scope="q_func",
reuse=True)
q_tp1_best_using_online_net = tf.argmax(q_tp1_using_online_net, 1)
q_tp1_best = tf.reduce_sum(
q_tp1 * tf.one_hot(q_tp1_best_using_online_net, num_actions),
1)
else:
q_tp1_best = tf.reduce_max(q_tp1, 1)
q_tp1_best_masked = (1.0 - done_mask_ph) * q_tp1_best
# compute RHS of bellman equation
q_t_selected_target = rew_t_ph + gamma * q_tp1_best_masked
# compute the error (potentially clipped)
td_error = q_t_selected - tf.stop_gradient(q_t_selected_target)
errors = U.huber_loss(td_error)
weighted_error = tf.reduce_mean(importance_weights_ph * errors)
# compute optimization op (potentially with gradient clipping)
if grad_norm_clipping is not None:
gradients = optimizer.compute_gradients(weighted_error,
var_list=q_func_vars)
for i, (grad, var) in enumerate(gradients):
if grad is not None:
gradients[i] = (tf.clip_by_norm(grad,
grad_norm_clipping), var)
optimize_expr = optimizer.apply_gradients(gradients)
else:
optimize_expr = optimizer.minimize(weighted_error,
var_list=q_func_vars)
# update_target_fn will be called periodically to copy Q network to target Q network
update_target_expr = []
for var, var_target in zip(
sorted(q_func_vars, key=lambda v: v.name),
sorted(target_q_func_vars, key=lambda v: v.name)):
update_target_expr.append(var_target.assign(var))
update_target_expr = tf.group(*update_target_expr)
# Create callable functions
train = U.function(inputs=[
obs_t_input, act_t_ph, rew_t_ph, obs_tp1_input, done_mask_ph,
importance_weights_ph
],
outputs=td_error,
updates=[optimize_expr])
update_target = U.function([], [], updates=[update_target_expr])
q_values = U.function([obs_t_input], q_t)
return act_f, train, update_target, {'q_values': q_values}
def build_model(self):
with tf.variable_scope('Model', reuse=tf.AUTO_REUSE):
with tf.name_scope('Inputs'):
# Model Feeds
self.ratings = tf.placeholder(dtype=tf.float32,
shape=[None, self.num_item],
name='ratings')
self.uid = tf.placeholder(dtype=tf.int32,
shape=[None],
name='user_id')
self.istraining = tf.placeholder(dtype=tf.bool,
shape=[],
name='training_flag')
self.layer1_dropout_rate = tf.placeholder(
dtype=tf.float32, shape=[], name='layer1_dropout_rate')
#########################################################################################################
with tf.name_scope('Variables'):
input = self.ratings
# Encoder Variables
self.layer1_w = tf.get_variable(
name='encoder_weights',
shape=[self.num_item, self.num_factors],
initializer=tf.truncated_normal_initializer(mean=0.0,
stddev=0.01))
self.layer1_b = tf.get_variable(
name='encoder_bias',
shape=[self.num_factors],
initializer=tf.zeros_initializer())
if self.is_user_node:
self.user_embedding = tf.get_variable(
name='user_embedding',
shape=[self.num_user, self.num_factors],
initializer=tf.truncated_normal_initializer(
mean=0.0, stddev=0.01),
dtype=tf.float32) # (users, embedding_size)
# Decoder Variables
self.layer2_w1 = tf.get_variable(
name='decoder_weights',
shape=[self.num_factors, self.num_item],
initializer=tf.truncated_normal_initializer(mean=0.0,
stddev=0.01))
layer2_w2 = tf.get_variable(
name='decoder_concat',
shape=[self.num_noise_factor, self.num_item],
initializer=tf.truncated_normal_initializer(mean=0.0,
stddev=0.01))
self.layer2_b = tf.get_variable(
name='decoder_bias',
shape=[self.num_item],
initializer=tf.zeros_initializer())
# Noise Variables
item_w1_noise = tf.get_variable(
name='item_w1_noise',
shape=[self.num_item, self.num_factors],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
if self.is_user_node:
user_w_noise = tf.get_variable(
name='user_w_noise',
shape=[self.num_user, self.num_factors],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
item_w2_noise = tf.get_variable(
name='item_w2_noise',
shape=[self.num_factors, self.num_item],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
hidden_noise_tr = tf.get_variable(
name='hidden_noise_tr',
shape=[self.batch_size, self.num_factors],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
hidden_noise_eval = tf.get_variable(
name='hidden_noise_eval',
shape=[self.num_user, self.num_factors],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
noise_vector_tr = tf.get_variable(
name='encoder_noise_tr',
shape=[self.batch_size, self.num_noise_factor],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
noise_vector_eval = tf.get_variable(
name='encoder_noise_eval',
shape=[self.num_user, self.num_noise_factor],
initializer=tf.zeros_initializer(),
dtype=tf.float32,
trainable=False)
#########################################################################################################
with tf.name_scope('Original_AE'):
############# Original AE Model
org_w1, org_w2 = self.layer1_w, self.layer2_w1
if self.robust_test:
if self.noise_pos == 'W1':
org_w1 += item_w1_noise
elif self.noise_pos == 'W2':
org_w2 += item_w2_noise
elif self.noise_pos == 'USER':
self.user_embedding += user_w_noise
if self.is_user_node:
user_node = tf.nn.embedding_lookup(self.user_embedding,
self.uid)
org_encoder = tf.sigmoid(
tf.matmul(input, org_w1) + self.layer1_b + user_node)
# org_encoder = tf.identity(tf.matmul(input, org_w1) + self.layer1_b + user_node)
else:
org_encoder = tf.sigmoid(
tf.matmul(input, org_w1) + self.layer1_b)
# org_encoder = tf.identity(tf.matmul(input, org_w1) + self.layer1_b)
if self.robust_test and self.noise_pos == 'HID':
org_encoder += hidden_noise_eval
org_encoder = tf.cond(
self.istraining,
lambda: tf.layers.dropout(org_encoder,
rate=self.layer1_dropout_rate,
name='layer1_dropout'),
lambda: org_encoder)
org_decoder = tf.identity(
tf.matmul(org_encoder, org_w2) + self.layer2_b)
self.org_output = org_decoder
org_base_loss = tf.reduce_sum(
tf.nn.sigmoid_cross_entropy_with_logits(
labels=input, logits=self.org_output))
# org_base_loss = tf.nn.l2_loss(self.org_output - input)
org_base_loss = org_base_loss / tf.cast(
tf.shape(input)[0], dtype=org_base_loss.dtype)
#########################################################################################################
###### The Noisy Auto-Encoder
if self.adv_training:
if self.noise_pos == 'CON':
# ConCat Noise AE
with tf.name_scope("ConCat_AE"):
if self.is_user_node:
user_node = tf.nn.embedding_lookup(
self.user_embedding, self.uid)
concat_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) +
self.layer1_b + user_node)
else:
concat_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) +
self.layer1_b)
concat_noise_encoder = tf.cond(
self.istraining, lambda: tf.concat(
[concat_noise_encoder, noise_vector_tr],
axis=1), lambda: tf.concat(
[concat_noise_encoder, noise_vector_eval],
axis=1))
concat_noise_encoder = tf.cond(
self.istraining, lambda: tf.layers.dropout(
concat_noise_encoder,
rate=self.layer1_dropout_rate,
name='layer1_dropout'),
lambda: concat_noise_encoder)
concat_w2 = tf.concat([self.layer2_w1, layer2_w2],
axis=0)
# out_vector = tf.sigmoid(tf.matmul(concat_noise_encoder, layer2_concat_w) + layer2_b)
concat_noise_decoder = tf.identity(
tf.matmul(concat_noise_encoder, concat_w2) +
self.layer2_b)
# Output
self.concat_noise_output = concat_noise_decoder
# Noisy Model Loss
concat_noise_base_loss = tf.reduce_sum(
tf.nn.sigmoid_cross_entropy_with_logits(
labels=input, logits=self.concat_noise_output))
# concat_noise_base_loss = tf.nn.l2_loss(tf.sigmoid(self.concat_noise_output) - input)
concat_noise_base_loss = concat_noise_base_loss / tf.cast(
tf.shape(input)[0],
dtype=concat_noise_base_loss.dtype)
if self.noise_pos == 'W1' or self.noise_pos == 'W1W2':
with tf.name_scope("W1_AE"):
w1_noise_w1 = self.layer1_w + item_w1_noise
if self.is_user_node:
user_node = tf.nn.embedding_lookup(
self.user_embedding, self.uid)
w1_noise_encoder = tf.sigmoid(
tf.matmul(input, w1_noise_w1) + self.layer1_b +
user_node)
# w1_noise_encoder = tf.identity(tf.matmul(input, w1_noise_w1) + self.layer1_b + user_node)
else:
w1_noise_encoder = tf.sigmoid(
tf.matmul(input, w1_noise_w1) + self.layer1_b)
# w1_noise_encoder = tf.identity(tf.matmul(input, w1_noise_w1) + self.layer1_b)
w1_noise_encoder = tf.cond(
self.istraining, lambda: tf.layers.dropout(
w1_noise_encoder,
rate=self.layer1_dropout_rate,
name='layer1_dropout'),
lambda: w1_noise_encoder)
w1_noise_decoder = tf.identity(
tf.matmul(w1_noise_encoder, self.layer2_w1) +
self.layer2_b)
# Output
self.w1_noise_output = w1_noise_decoder
# Noisy Model Loss
w1_noise_base_loss = tf.reduce_sum(
tf.nn.sigmoid_cross_entropy_with_logits(
labels=input, logits=self.w1_noise_output))
# w1_noise_base_loss = tf.nn.l2_loss(self.w1_noise_output - input)
w1_noise_base_loss = w1_noise_base_loss / tf.cast(
tf.shape(input)[0], dtype=w1_noise_base_loss.dtype)
if self.noise_pos == 'W2' or self.noise_pos == 'W1W2':
with tf.name_scope("W2_AE"):
w2_noise_w2 = self.layer2_w1 + item_w2_noise
if self.is_user_node:
user_node = tf.nn.embedding_lookup(
self.user_embedding, self.uid)
w2_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) +
self.layer1_b + user_node)
# w2_noise_encoder = tf.identity(tf.matmul(input, self.layer1_w) + self.layer1_b + user_node)
else:
w2_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) +
self.layer1_b)
# w2_noise_encoder = tf.identity(tf.matmul(input, self.layer1_w) + self.layer1_b)
w2_noise_encoder = tf.cond(
self.istraining, lambda: tf.layers.dropout(
w2_noise_encoder,
rate=self.layer1_dropout_rate,
name='layer1_dropout'),
lambda: w2_noise_encoder)
w2_noise_decoder = tf.identity(
tf.matmul(w2_noise_encoder, w2_noise_w2) +
self.layer2_b)
# Output
self.w2_noise_output = w2_noise_decoder
# Noisy Model Loss
w2_noise_base_loss = tf.reduce_sum(
tf.nn.sigmoid_cross_entropy_with_logits(
labels=input, logits=self.w2_noise_output))
# w2_noise_base_loss = tf.nn.l2_loss(self.w2_noise_output - input)
w2_noise_base_loss = w2_noise_base_loss / tf.cast(
tf.shape(input)[0], dtype=w2_noise_base_loss.dtype)
if self.noise_pos == 'USER':
with tf.name_scope("USER_AE"):
self.user_embedding += user_w_noise
user_node = tf.nn.embedding_lookup(
self.user_embedding, self.uid)
user_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) + self.layer1_b +
user_node)
user_noise_encoder = tf.cond(
self.istraining, lambda: tf.layers.dropout(
user_noise_encoder,
rate=self.layer1_dropout_rate,
name='layer1_dropout'),
lambda: user_noise_encoder)
user_noise_decoder = tf.identity(
tf.matmul(user_noise_encoder, self.layer2_w1) +
self.layer2_b)
# Output
self.user_noise_output = user_noise_decoder
# Noisy Model Loss
user_noise_base_loss = tf.reduce_sum(
tf.nn.sigmoid_cross_entropy_with_logits(
labels=input, logits=self.user_noise_output))
# weight_noise_base_loss = tf.nn.l2_loss(tf.sigmoid(self.weight_noise_output) - input)
user_noise_base_loss = user_noise_base_loss / tf.cast(
tf.shape(input)[0],
dtype=user_noise_base_loss.dtype)
if self.noise_pos == 'HID':
with tf.name_scope("Hidden_AE"):
if self.is_user_node:
user_node = tf.nn.embedding_lookup(
self.user_embedding, self.uid)
hidden_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) +
self.layer1_b + user_node) + hidden_noise_tr
else:
hidden_noise_encoder = tf.sigmoid(
tf.matmul(input, self.layer1_w) +
self.layer1_b) + hidden_noise_tr
hidden_noise_encoder = tf.cond(
self.istraining, lambda: tf.layers.dropout(
hidden_noise_encoder,
rate=self.layer1_dropout_rate,
name='layer1_dropout'),
lambda: hidden_noise_encoder)
hidden_noise_decoder = tf.identity(
tf.matmul(hidden_noise_encoder, self.layer2_w1) +
self.layer2_b)
# Output
self.hidden_noise_output = hidden_noise_decoder
hidden_noise_base_loss = tf.reduce_sum(
tf.nn.sigmoid_cross_entropy_with_logits(
labels=input, logits=self.hidden_noise_output))
# hidden_noise_base_loss = tf.nn.l2_loss(tf.sigmoid(self.hidden_noise_output) - input)
hidden_noise_base_loss = hidden_noise_base_loss / tf.cast(
tf.shape(input)[0],
dtype=self.hidden_noise_output.dtype)
############# Final Outputs
with tf.name_scope('Prediction'):
# self.mixed_output = (1-self.output_mix_ratio) * self.org_output + self.output_mix_ratio * self.noisy_output
self.pred_y = tf.sigmoid(self.org_output)
# self.pred_y = self.org_output
# self.pred_y = tf.sigmoid(self.mixed_output)
############# Overall Losses
with tf.name_scope('Loss'):
if self.adv_training:
if self.noise_pos == 'W1':
base_loss = self.org_loss_ratio * org_base_loss + self.noise_loss_ratio_W1 * w1_noise_base_loss
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(w1_noise_w1) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(self.layer2_w1) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
if self.noise_pos == 'W2':
base_loss = self.org_loss_ratio * org_base_loss + self.noise_loss_ratio * w2_noise_base_loss
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(self.layer1_w) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(w2_noise_w2) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
if self.noise_pos == 'HID':
base_loss = self.org_loss_ratio * org_base_loss + self.noise_loss_ratio * hidden_noise_base_loss
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(self.layer1_w) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(self.layer2_w1) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
if self.noise_pos == 'USER':
base_loss = self.org_loss_ratio * org_base_loss + self.noise_loss_ratio * user_noise_base_loss
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(self.layer1_w) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(self.layer2_w1) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
if self.noise_pos == 'CON':
base_loss = self.org_loss_ratio * org_base_loss + self.noise_loss_ratio * concat_noise_base_loss
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(self.layer1_w) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(concat_w2) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
if self.noise_pos == 'W1W2':
base_loss = self.org_loss_ratio * org_base_loss + self.noise_loss_ratio_W1 * w1_noise_base_loss + self.noise_loss_ratio * w2_noise_base_loss
if self.noise_loss_ratio_W1 != 0 and self.noise_loss_ratio != 0:
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(w1_noise_w1) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(w2_noise_w2) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
elif self.noise_loss_ratio_W1 == 0: #Noise on W2 only
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(self.layer1_w) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(w2_noise_w2) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
elif self.noise_loss_ratio == 0: #Noise on W1 only
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(w1_noise_w1) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(self.layer2_w1) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
else:
base_loss = org_base_loss
reg_loss = self.ae_regs[0] * tf.nn.l2_loss(self.layer1_w) + \
self.ae_regs[1] * tf.nn.l2_loss(self.layer1_b) + \
self.ae_regs[2] * tf.nn.l2_loss(self.layer2_w1) + \
self.ae_regs[3] * tf.nn.l2_loss(self.layer2_b)
if self.is_user_node:
reg_loss += self.user_node_regs * tf.nn.l2_loss(
self.user_embedding)
self.loss = base_loss + reg_loss
############# Optimizer
with tf.name_scope('Optimizer'):
self.opt = tf.train.GradientDescentOptimizer(self.lr).minimize(
self.loss)
# self.opt = tf.train.AdagradOptimizer(self.lr).minimize(self.loss)
########### Robustness Testing (Random or Adversial)
with tf.name_scope('Noise_Adding'):
if self.adv_training or self.robust_test:
if self.noise_type == 'random':
if self.noise_pos == 'W1':
random_noise = tf.random_normal(
shape=tf.shape(org_w1),
mean=tf.reduce_mean(org_w1),
stddev=0.01)
self.update_delta = item_w1_noise.assign(
self.eps * random_noise /
tf.norm(random_noise))
if self.noise_pos == 'W2':
random_noise = tf.random_normal(
shape=tf.shape(org_w2),
mean=tf.reduce_mean(org_w2),
stddev=0.01)
self.update_delta = item_w2_noise.assign(
self.eps * random_noise /
tf.norm(random_noise))
if self.noise_pos == 'USER':
random_noise = tf.random_normal(
shape=tf.shape(self.user_embedding),
mean=tf.reduce_mean(self.user_embedding),
stddev=0.01)
self.update_delta = user_w_noise.assign(
self.eps * random_noise /
tf.norm(random_noise))
if self.noise_pos == 'HID':
random_noise = tf.random_normal(
shape=tf.shape(org_encoder),
mean=tf.reduce_mean(org_encoder),
stddev=0.01)
if self.robust_test:
self.update_delta = hidden_noise_eval.assign(
self.eps * random_noise /
tf.norm(random_noise))
else:
self.update_delta = hidden_noise_tr.assign(
self.eps * random_noise /
tf.norm(random_noise))
if self.noise_type == 'adv':
if self.noise_pos == 'W1':
if self.robust_test:
self.grad_delta = tf.gradients(
ys=org_base_loss, xs=item_w1_noise)[0]
else:
self.grad_delta = tf.gradients(
ys=base_loss, xs=item_w1_noise)[0]
self.grad_delta_dense = tf.stop_gradient(
self.grad_delta)
self.update_delta = item_w1_noise.assign(
self.eps * self.grad_delta_dense /
tf.norm(self.grad_delta_dense))
if self.noise_pos == 'W2':
if self.robust_test:
self.grad_delta = tf.gradients(
ys=org_base_loss, xs=item_w2_noise)[0]
else:
self.grad_delta = tf.gradients(
ys=base_loss, xs=item_w2_noise)[0]
self.grad_delta_dense = tf.stop_gradient(
self.grad_delta)
self.update_delta = item_w2_noise.assign(
self.eps * self.grad_delta_dense /
tf.norm(self.grad_delta_dense))
if self.noise_pos == 'USER':
if self.robust_test:
self.grad_delta = tf.gradients(
ys=org_base_loss, xs=user_w_noise)[0]
else:
self.grad_delta = tf.gradients(
ys=base_loss, xs=user_w_noise)[0]
self.grad_delta_dense = tf.stop_gradient(
self.grad_delta)
self.update_delta = user_w_noise.assign(
self.eps * self.grad_delta_dense /
tf.norm(self.grad_delta_dense))
if self.noise_pos == 'HID':
if self.robust_test:
self.grad_delta = tf.gradients(
ys=org_base_loss, xs=hidden_noise_eval)[0]
self.grad_delta_dense = tf.stop_gradient(
self.grad_delta)
self.update_delta = hidden_noise_eval.assign(
self.eps * self.grad_delta_dense /
tf.norm(self.grad_delta_dense))
else:
self.grad_delta = tf.gradients(
ys=base_loss, xs=hidden_noise_tr)[0]
self.grad_delta_dense = tf.stop_gradient(
self.grad_delta)
self.update_delta = hidden_noise_tr.assign(
self.eps * self.grad_delta_dense /
tf.norm(self.grad_delta_dense))
if self.noise_pos == 'W1W2':
if self.robust_test:
if self.noise_loss_ratio != 0 and self.noise_loss_ratio_W1 != 0:
self.grad_delta1 = tf.gradients(
ys=org_base_loss, xs=item_w1_noise)[0]
self.grad_delta2 = tf.gradients(
ys=org_base_loss, xs=item_w2_noise)[0]
elif self.noise_loss_ratio_W1 == 0:
self.grad_delta2 = tf.gradients(
ys=org_base_loss, xs=item_w2_noise)[0]
elif self.noise_loss_ratio == 0:
self.grad_delta1 = tf.gradients(
ys=org_base_loss, xs=item_w1_noise)[0]
else:
if self.noise_loss_ratio != 0 and self.noise_loss_ratio_W1 != 0:
self.grad_delta1 = tf.gradients(
ys=base_loss, xs=item_w1_noise)[0]
self.grad_delta2 = tf.gradients(
ys=base_loss, xs=item_w2_noise)[0]
elif self.noise_loss_ratio_W1 == 0:
self.grad_delta2 = tf.gradients(
ys=base_loss, xs=item_w2_noise)[0]
elif self.noise_loss_ratio == 0:
self.grad_delta1 = tf.gradients(
ys=base_loss, xs=item_w1_noise)[0]
if self.noise_loss_ratio != 0 and self.noise_loss_ratio_W1 != 0:
self.grad_delta_dense1 = tf.stop_gradient(
self.grad_delta1)
self.grad_delta_dense2 = tf.stop_gradient(
self.grad_delta2)
self.update_delta1 = item_w1_noise.assign(
self.eps * self.grad_delta_dense1 /
tf.norm(self.grad_delta_dense1))
self.update_delta2 = item_w2_noise.assign(
self.eps * self.grad_delta_dense2 /
tf.norm(self.grad_delta_dense2))
self.update_delta = self.update_delta1 + tf.transpose(
self.update_delta2)
elif self.noise_loss_ratio_W1 == 0:
self.grad_delta_dense2 = tf.stop_gradient(
self.grad_delta2)
self.update_delta2 = item_w2_noise.assign(
self.eps * self.grad_delta_dense2 /
tf.norm(self.grad_delta_dense2))
self.update_delta = self.update_delta2
elif self.noise_loss_ratio == 0:
self.grad_delta_dense1 = tf.stop_gradient(
self.grad_delta1)
self.update_delta1 = item_w1_noise.assign(
self.eps * self.grad_delta_dense1 /
tf.norm(self.grad_delta_dense1))
self.update_delta = self.update_delta1
print('Model Building Completed.')
def loss(self, predictions, policy, cfv):
r = tf.stop_gradient(
cpea.rm_policy(cfv -
tf.reduce_sum(cfv * policy, axis=1, keepdims=True)))
log_policy = tf.log(tf.clip_by_value(policy, 1e-15, 1 - 1e-15))
return -tf.reduce_mean(tf.reduce_sum(r * log_policy, axis=1))
def _build(self):
inpts = [self.tiled_obs]
if self.coords is not None:
inpts.append(self.tiled_coords)
self.outputs = self.sequence(*inpts)
self.__dict__.update(self.outputs)
log_weights = tf.reduce_sum(self.outputs.log_weights_per_timestep, 0)
self.log_weights = tf.reshape(log_weights, (self.batch_size, self.k_particles))
self.elbo_vae = tf.reduce_mean(self.log_weights)
self.elbo_iwae_per_example = targets.iwae(self.log_weights)
self.elbo_iwae = tf.reduce_mean(self.elbo_iwae_per_example)
self.normalised_elbo_vae = self.elbo_vae / tf.to_float(self.n_timesteps)
self.normalised_elbo_iwae = self.elbo_iwae / tf.to_float(self.n_timesteps)
tf.summary.scalar('normalised_vae', self.normalised_elbo_vae)
tf.summary.scalar('normalised_iwae', self.normalised_elbo_iwae)
self.importance_weights = tf.stop_gradient(tf.nn.softmax(self.log_weights, -1))
self.ess = ops.ess(self.importance_weights, average=True)
self.iw_distrib = tf.distributions.Categorical(probs=self.importance_weights)
self.iw_resampling_idx = self.iw_distrib.sample()
# Logging
self._log_resampled(self.data_ll_per_sample, 'data_ll')
self._log_resampled(self.log_p_z_per_sample, 'log_p_z')
self._log_resampled(self.log_q_z_given_x_per_sample, 'log_q_z_given_x')
self._log_resampled(self.kl_per_sample, 'kl')
# Mean squared error between inpt and mean of output distribution
inpt_obs = self.tiled_obs
if inpt_obs.shape[-1] == 1:
inpt_obs = tf.squeeze(inpt_obs, -1)
axes = [0] + list(range(inpt_obs.shape.ndims)[2:])
self.mse_per_sample = tf.reduce_mean((inpt_obs - self.canvas) ** 2, axes)
self._log_resampled(self.mse_per_sample, 'mse')
self.raw_mse = tf.reduce_mean(self.mse_per_sample)
tf.summary.scalar('raw_mse', self.raw_mse)
if hasattr(self, 'num_steps_per_sample'):
self._log_resampled(self.num_steps_per_sample, 'num_steps')
if self.gt_presence is not None:
self.gt_num_steps = tf.reduce_sum(self.gt_presence, -1)
num_steps_per_sample = tf.reshape(self.num_steps_per_sample, (-1, self.batch_size, self.k_particles))
gt_num_steps = tf.expand_dims(self.gt_num_steps, -1)
self.num_step_accuracy_per_example = tf.to_float(tf.equal(gt_num_steps, num_steps_per_sample))
self.raw_num_step_accuracy = tf.reduce_mean(self.num_step_accuracy_per_example)
self.num_step_accuracy = self._imp_weighted_mean(self.num_step_accuracy_per_example)
tf.summary.scalar('num_step_acc', self.num_step_accuracy)
# For rendering
resampled_names = 'obj_id canvas glimpse presence_prob presence presence_logit where'.split()
for name in resampled_names:
try:
setattr(self, 'resampled_' + name, self.resample(getattr(self, name), axis=1))
except AttributeError:
pass
try:
self._log_resampled(self.num_disc_steps_per_sample, 'num_disc_steps')
self._log_resampled(self.num_prop_steps_per_sample, 'num_prop_steps')
except AttributeError:
pass
def main(_):
since = time.time()
tf.logging.set_verbosity(tf.logging.INFO)
# Create directories to store TensorBoard summaries
if tf.gfile.Exists(FLAGS.summaries_dir):
tf.gfile.DeleteRecursively(FLAGS.summaries_dir)
tf.gfile.MakeDirs(FLAGS.summaries_dir)
# Set model Hyperparameter
model_config = pretrain_model.get_model_config()
# Read the folder structure, and create lists of all the images
image_lists = utils.create_image_lists(FLAGS.images_dir)
class_count = len(image_lists.keys())
if class_count == 0:
tf.logging.error("No valid folders of images found at " +
FLAGS.images_dir)
return -1
if class_count == 1:
tf.logging.error("Only one valid folder of images found at " +
FLAGS.images_dir)
return -1
# Create output_labels.txt displaying classes being trained
with open(FLAGS.output_labels, "w") as f:
f.write("\n".join(image_lists.keys()) + "\n")
with tf.Session() as sess:
# Set up the image decoding
jpeg_data, decoded_image = pretrain_model.decode_jpeg(
model_config["input_width"], model_config["input_height"],
model_config["input_depth"], model_config["input_mean"],
model_config["input_std"])
# Load DenseNet model
densenet_model, bottlenecks, resized_image, bottlenecks_size = pretrain_model.load_densenet_169(
FLAGS.model_dir)
# store pretrained model bottlenecks
bottleneck.store_bottlenecks(sess,
image_lists,
FLAGS.images_dir,
FLAGS.bottlenecks_dir,
FLAGS.model_name,
jpeg_data,
decoded_image,
resized_image,
bottlenecks,
model=densenet_model)
bottlenecks = tf.stop_gradient(bottlenecks)
global_step = tf.Variable(tf.constant(0), trainable=False)
# Initialized final layer
(train_step, cross_entropy, accuracy, bottlenecks_input, labels_input,
final_result) = train.final_layer(len(image_lists.keys()),
FLAGS.final_name, bottlenecks,
bottlenecks_size,
FLAGS.learning_rate, global_step)
merged = tf.summary.merge_all()
train_writer = tf.summary.FileWriter(FLAGS.summaries_dir + "/train",
sess.graph)
validation_writer = tf.summary.FileWriter(FLAGS.summaries_dir +
"/validation")
# Initialize all variables
init = tf.global_variables_initializer()
sess.run(init)
# Get validation bottlenecks for evaluation
validation_bottlenecks, validation_labels = (
bottleneck.get_batch_of_bottlenecks(
sess, image_lists, FLAGS.validation_batch_size, "validation",
FLAGS.bottlenecks_dir, FLAGS.images_dir, FLAGS.model_name,
jpeg_data, decoded_image, resized_image, bottlenecks))
# Get test bottlenecks for evaluation
test_bottlenecks, test_labels = (bottleneck.get_batch_of_bottlenecks(
sess, image_lists, FLAGS.test_batch_size, "testing",
FLAGS.bottlenecks_dir, FLAGS.images_dir, FLAGS.model_name,
jpeg_data, decoded_image, resized_image, bottlenecks))
best_acc = 0.0
for i in range(FLAGS.iterations):
# Get training bottlenecks
(train_bottlenecks,
train_labels) = bottleneck.get_batch_of_bottlenecks(
sess, image_lists, FLAGS.train_batch_size, "training",
FLAGS.bottlenecks_dir, FLAGS.images_dir, FLAGS.model_name,
jpeg_data, decoded_image, resized_image, bottlenecks)
# Training step
train_summary, _ = sess.run(
[merged, train_step],
feed_dict={
bottlenecks_input: train_bottlenecks,
labels_input: train_labels,
global_step: i
})
train_writer.add_summary(train_summary, i)
# Show evaluation based on specified frequency
final_step = (i + 1 == FLAGS.iterations)
if (i % FLAGS.eval_interval) == 0 or final_step:
# Evaluation
train_accuracy, train_loss = sess.run(
[accuracy, cross_entropy],
feed_dict={
bottlenecks_input: train_bottlenecks,
labels_input: train_labels
})
# Run evaluation step on validation bottlenecks
validation_summary, validation_accuracy, validation_loss = sess.run(
[merged, accuracy, cross_entropy],
feed_dict={
bottlenecks_input: validation_bottlenecks,
labels_input: validation_labels
})
validation_writer.add_summary(validation_summary, i)
# Save best accuracy and store model
if validation_accuracy > best_acc:
best_acc = validation_accuracy
# Calculate the test accuracy with best validation on test bottlenecks
test_accuracy1, test_loss1 = sess.run(
[accuracy, cross_entropy],
feed_dict={
bottlenecks_input: test_bottlenecks,
labels_input: test_labels
})
train.save_graph_to_file(sess, FLAGS.output_graph,
FLAGS.final_name)
train.save_checkpoint_to_file(sess,
FLAGS.output_checkpoint_dir)
tf.logging.info(
"Iteration {}: train loss = {}, train acc = {}, val loss = {}, val acc = {}."
.format(i, train_loss, train_accuracy, validation_loss,
validation_accuracy))
# Calculate the final test accuracy on test bottlenecks.
test_accuracy2, test_loss2 = sess.run([accuracy, cross_entropy],
feed_dict={
bottlenecks_input:
test_bottlenecks,
labels_input: test_labels
})
tf.logging.info("Best validation accuracy = {}".format(best_acc * 100))
tf.logging.info("Test accuracy with best validation = {}".format(
test_accuracy1 * 100))
tf.logging.info("Final test accuracy = {}".format(test_accuracy2 *
100))
time_elapsed = time.time() - since
print("Runtime: {}min, {:0.2f}sec".format(int(time_elapsed // 60),
time_elapsed % 60))
with open(os.path.join("..", FLAGS.model_name, "results.txt"), "w") as f:
f.write("Best validation accuracy: " + str(best_acc) + "\n")
f.write("Test accuracy with best validation: " + str(test_accuracy1) +
"\n")
f.write("Final test accuracy = {}".format(test_accuracy2 * 100) +
"\n")
f.write("Runtime: " + str(int(time_elapsed // 60)) + "min," +
str(time_elapsed % 60) + "sec")