def compute_grid_positions(boxes, boundaries, output_size, sample_offset):
"""Compute the grid position w.r.t.
the corresponding feature map.
Args:
boxes: a 3-D tensor of shape [batch_size, num_boxes, 4] encoding the
information of each box w.r.t. the corresponding feature map.
boxes[:, :, 0:2] are the grid position in (y, x) (float) of the top-left
corner of each box. boxes[:, :, 2:4] are the box sizes in (h, w) (float)
in terms of the number of pixels of the corresponding feature map size.
boundaries: a 3-D tensor of shape [batch_size, num_boxes, 2] representing
the boundary (in (y, x)) of the corresponding feature map for each box.
Any resampled grid points that go beyond the bounary will be clipped.
output_size: a scalar indicating the output crop size.
sample_offset: a float number in [0, 1] indicates the subpixel sample offset
from grid point.
Returns:
kernel_y: Tensor of size [batch_size, boxes, output_size, 2, 1].
kernel_x: Tensor of size [batch_size, boxes, output_size, 2, 1].
box_grid_y0y1: Tensor of size [batch_size, boxes, output_size, 2]
box_grid_x0x1: Tensor of size [batch_size, boxes, output_size, 2]
"""
batch_size, num_boxes, _ = boxes.get_shape().as_list()
box_grid_x = []
box_grid_y = []
for i in range(output_size):
box_grid_x.append(boxes[:, :, 1] +
(i + sample_offset) * boxes[:, :, 3] / output_size)
box_grid_y.append(boxes[:, :, 0] +
(i + sample_offset) * boxes[:, :, 2] / output_size)
box_grid_x = tf.stack(box_grid_x, axis=2)
box_grid_y = tf.stack(box_grid_y, axis=2)
box_grid_y0 = tf.floor(box_grid_y)
box_grid_x0 = tf.floor(box_grid_x)
box_grid_x0 = tf.maximum(0., box_grid_x0)
box_grid_y0 = tf.maximum(0., box_grid_y0)
box_grid_x0 = tf.minimum(box_grid_x0,
tf.expand_dims(boundaries[:, :, 1], -1))
box_grid_x1 = tf.minimum(box_grid_x0 + 1,
tf.expand_dims(boundaries[:, :, 1], -1))
box_grid_y0 = tf.minimum(box_grid_y0,
tf.expand_dims(boundaries[:, :, 0], -1))
box_grid_y1 = tf.minimum(box_grid_y0 + 1,
tf.expand_dims(boundaries[:, :, 0], -1))
box_gridx0x1 = tf.stack([box_grid_x0, box_grid_x1], axis=-1)
box_gridy0y1 = tf.stack([box_grid_y0, box_grid_y1], axis=-1)
# The RoIAlign feature f can be computed by bilinear interpolation of four
# neighboring feature points f0, f1, f2, and f3.
# f(y, x) = [hy, ly] * [[f00, f01], * [hx, lx]^T
# [f10, f11]]
# f(y, x) = (hy*hx)f00 + (hy*lx)f01 + (ly*hx)f10 + (lx*ly)f11
# f(y, x) = w00*f00 + w01*f01 + w10*f10 + w11*f11
ly = box_grid_y - box_grid_y0
lx = box_grid_x - box_grid_x0
hy = 1.0 - ly
hx = 1.0 - lx
kernel_y = tf.reshape(tf.stack([hy, ly], axis=3),
[batch_size, num_boxes, output_size, 2, 1])
kernel_x = tf.reshape(tf.stack([hx, lx], axis=3),
[batch_size, num_boxes, output_size, 2, 1])
return kernel_y, kernel_x, box_gridy0y1, box_gridx0x1
def lrelu(x, leak=0.2, name="lrelu"):
return tf.maximum(x, leak * x)
def train_dvrl(self, perf_metric):
"""Trains DVRL based on the specified objective function.
Args:
perf_metric: 'auc', 'accuracy', 'log-loss' for classification
'mae', 'mse', 'rmspe' for regression
"""
# Generates selected probability
est_data_value = self.data_value_evaluator()
# Generator loss (REINFORCE algorithm)
prob = tf.reduce_sum(self.s_input * tf.log(est_data_value + self.epsilon) +\
(1-self.s_input) * \
tf.log(1 - est_data_value + self.epsilon))
dve_loss = (-self.reward_input * prob) + \
1e3 * (tf.maximum(tf.reduce_mean(est_data_value) \
- self.threshold, 0) + \
tf.maximum((1-self.threshold) - \
tf.reduce_mean(est_data_value), 0))
# Variable
dve_vars = [v for v in tf.trainable_variables() \
if v.name.startswith('data_value_estimator')]
# Solver
dve_solver = tf.train.AdamOptimizer(self.learning_rate).minimize(
dve_loss, var_list=dve_vars)
# Baseline performance
if self.flag_sgd:
y_valid_hat = self.ori_model.predict(self.x_valid)
else:
if self.problem == 'classification':
y_valid_hat = self.ori_model.predict_proba(self.x_valid)
elif self.problem == 'regression':
y_valid_hat = self.ori_model.predict(self.x_valid)
if perf_metric == 'auc':
valid_perf = metrics.roc_auc_score(self.y_valid, y_valid_hat[:, 1])
elif perf_metric == 'accuracy':
valid_perf = metrics.accuracy_score(self.y_valid,
np.argmax(y_valid_hat, axis=1))
elif perf_metric == 'log_loss':
valid_perf = -metrics.log_loss(self.y_valid, y_valid_hat)
elif perf_metric == 'rmspe':
valid_perf = dvrl_metrics.rmspe(self.y_valid, y_valid_hat)
elif perf_metric == 'mae':
valid_perf = metrics.mean_absolute_error(self.y_valid, y_valid_hat)
elif perf_metric == 'mse':
valid_perf = metrics.mean_squared_error(self.y_valid, y_valid_hat)
# Prediction differences
if self.flag_sgd:
y_train_valid_pred = self.val_model.predict(self.x_train)
else:
if self.problem == 'classification':
y_train_valid_pred = self.val_model.predict_proba(self.x_train)
elif self.problem == 'regression':
y_train_valid_pred = self.val_model.predict(self.x_train)
y_train_valid_pred = np.reshape(y_train_valid_pred, [-1, 1])
if self.problem == 'classification':
y_pred_diff = np.abs(self.y_train_onehot - y_train_valid_pred)
elif self.problem == 'regression':
y_pred_diff = \
np.abs(self.y_train_onehot - y_train_valid_pred)/self.y_train_onehot
# Main session
sess = tf.Session()
sess.run(tf.global_variables_initializer())
# Model save at the end
saver = tf.train.Saver(dve_vars)
for _ in tqdm.tqdm(range(self.outer_iterations)):
# Batch selection
batch_idx = \
np.random.permutation(len(self.x_train[:, 0]))[:self.batch_size]
x_batch = self.x_train[batch_idx, :]
y_batch_onehot = self.y_train_onehot[batch_idx]
y_batch = self.y_train[batch_idx]
y_hat_batch = y_pred_diff[batch_idx]
# Generates selection probability
est_dv_curr = sess.run(est_data_value,
feed_dict={
self.x_input: x_batch,
self.y_input: y_batch_onehot,
self.y_hat_input: y_hat_batch
})
# Samples the selection probability
sel_prob_curr = np.random.binomial(1, est_dv_curr,
est_dv_curr.shape)
# Exception (When selection probability is 0)
if np.sum(sel_prob_curr) == 0:
est_dv_curr = 0.5 * np.ones(np.shape(est_dv_curr))
sel_prob_curr = np.random.binomial(1, est_dv_curr,
est_dv_curr.shape)
# Trains predictor
# If the predictor is neural network
if 'summary' in dir(self.pred_model):
new_model = self.pred_model
new_model.load_weights('tmp/pred_model.h5')
# Train the model
new_model.fit(x_batch,
y_batch_onehot,
sample_weight=sel_prob_curr[:, 0],
batch_size=self.batch_size_predictor,
epochs=self.inner_iterations,
verbose=False)
y_valid_hat = new_model.predict(self.x_valid)
else:
new_model = self.pred_model
new_model.fit(x_batch, y_batch, sel_prob_curr[:, 0])
# Prediction
if 'summary' in dir(new_model):
y_valid_hat = new_model.predict(self.x_valid)
else:
if self.problem == 'classification':
y_valid_hat = new_model.predict_proba(self.x_valid)
elif self.problem == 'regression':
y_valid_hat = new_model.predict(self.x_valid)
# Reward computation
if perf_metric == 'auc':
dvrl_perf = metrics.roc_auc_score(self.y_valid, y_valid_hat[:,
1])
elif perf_metric == 'accuracy':
dvrl_perf = metrics.accuracy_score(
self.y_valid, np.argmax(y_valid_hat, axis=1))
elif perf_metric == 'log_loss':
dvrl_perf = -metrics.log_loss(self.y_valid, y_valid_hat)
elif perf_metric == 'rmspe':
dvrl_perf = dvrl_metrics.rmspe(self.y_valid, y_valid_hat)
elif perf_metric == 'mae':
dvrl_perf = metrics.mean_absolute_error(
self.y_valid, y_valid_hat)
elif perf_metric == 'mse':
dvrl_perf = metrics.mean_squared_error(self.y_valid,
y_valid_hat)
if self.problem == 'classification':
reward_curr = dvrl_perf - valid_perf
elif self.problem == 'regression':
reward_curr = valid_perf - dvrl_perf
# Trains the generator
_, _ = sess.run(
[dve_solver, dve_loss],
feed_dict={
self.x_input: x_batch,
self.y_input: y_batch_onehot,
self.y_hat_input: y_hat_batch,
self.s_input: sel_prob_curr,
self.reward_input: reward_curr
})
# Saves trained model
saver.save(sess, self.checkpoint_file_name)
# Trains DVRL predictor
# Generate data values
final_data_value = sess.run(est_data_value,
feed_dict={
self.x_input: self.x_train,
self.y_input: self.y_train_onehot,
self.y_hat_input: y_pred_diff
})[:, 0]
# Trains final model
# If the final model is neural network
if 'summary' in dir(self.pred_model):
self.final_model.load_weights('tmp/pred_model.h5')
# Train the model
self.final_model.fit(self.x_train,
self.y_train_onehot,
sample_weight=final_data_value,
batch_size=self.batch_size_predictor,
epochs=self.inner_iterations,
verbose=False)
else:
self.final_model.fit(self.x_train, self.y_train, final_data_value)
def _leaky_relu(x):
return tf.maximum(0.2 * x, x)
def _update_critic_td3(self, obs, action, next_obs, reward, mask):
"""Updates parameters of td3 critic given samples from the batch.
Args:
obs: A tfe.Variable with a batch of observations.
action: A tfe.Variable with a batch of actions.
next_obs: A tfe.Variable with a batch of next observations.
reward: A tfe.Variable with a batch of rewards.
mask: A tfe.Variable with a batch of masks.
"""
# Avoid using tensorflow random functions since it's impossible to get
# the state of the random number generator used by TensorFlow.
target_action_noise = np.random.normal(
size=action.get_shape(), scale=self.policy_noise).astype('float32')
target_action_noise = contrib_eager_python_tfe.Variable(
target_action_noise)
target_action_noise = tf.clip_by_value(target_action_noise,
-self.policy_noise_clip,
self.policy_noise_clip)
noisy_action_targets = self.actor_target(
next_obs) + target_action_noise
clipped_noisy_action_targets = tf.clip_by_value(
noisy_action_targets, -1, 1)
if self.use_absorbing_state:
# Starting from the goal state we can execute only non-actions.
a_mask = tf.maximum(0, mask)
q_next1, q_next2 = self.critic_target(
next_obs, clipped_noisy_action_targets * a_mask)
q_next = tf.reduce_min(tf.concat([q_next1, q_next2], -1),
-1,
keepdims=True)
q_target = reward + self.discount * q_next
else:
q_next1, q_next2 = self.critic_target(
next_obs, clipped_noisy_action_targets)
q_next = tf.reduce_min(tf.concat([q_next1, q_next2], -1),
-1,
keepdims=True)
q_target = reward + self.discount * mask * q_next
with tf.GradientTape() as tape:
q_pred1, q_pred2 = self.critic(obs, action)
critic_loss = tf.losses.mean_squared_error(
q_target, q_pred1) + tf.losses.mean_squared_error(
q_target, q_pred2)
grads = tape.gradient(critic_loss, self.critic.variables)
self.critic_optimizer.apply_gradients(zip(grads,
self.critic.variables),
global_step=self.critic_step)
if self.use_absorbing_state:
with contrib_summary.record_summaries_every_n_global_steps(
100, self.critic_step):
a_mask = tf.maximum(0, -mask)
if tf.reduce_sum(a_mask).numpy() > 0:
contrib_summary.scalar('critic/absorbing_reward',
tf.reduce_sum(reward * a_mask) /
tf.reduce_sum(a_mask),
step=self.critic_step)
with contrib_summary.record_summaries_every_n_global_steps(
100, self.critic_step):
contrib_summary.scalar('critic/loss',
critic_loss,
step=self.critic_step)
def leaky_relu(input_, **kwargs):
if input_.dtype in [tf.complex64, tf.complex128]:
raise TypeError('leaky-relu currently does not support complex input')
leak = kwargs.get('leak', 0.1)
return tf.maximum(input_, input_ * leak, name='lrelu')
def mask(config: configure_pretraining.PretrainingConfig,
inputs: pretrain_data.Inputs, mask_prob, proposal_distribution=1.0,
disallow_from_mask=None, already_masked=None):
"""Implementation of dynamic masking. The optional arguments aren't needed for
BERT/ELECTRA and are from early experiments in "strategically" masking out
tokens instead of uniformly at random.
Args:
config: configure_pretraining.PretrainingConfig
inputs: pretrain_data.Inputs containing input input_ids/input_mask
mask_prob: percent of tokens to mask
proposal_distribution: for non-uniform masking can be a [B, L] tensor
of scores for masking each position.
disallow_from_mask: a boolean tensor of [B, L] of positions that should
not be masked out
already_masked: a boolean tensor of [B, N] of already masked-out tokens
for multiple rounds of masking
Returns: a pretrain_data.Inputs with masking added
"""
# Get the batch size, sequence length, and max masked-out tokens
N = config.max_predictions_per_seq
B, L = modeling.get_shape_list(inputs.input_ids)
# Find indices where masking out a token is allowed
vocab = tokenization.FullTokenizer(
config.vocab_file, config.model_sentencepiece_path, do_lower_case=config.do_lower_case).vocab
candidates_mask = _get_candidates_mask(inputs, vocab, disallow_from_mask)
# Set the number of tokens to mask out per example
num_tokens = tf.cast(tf.reduce_sum(inputs.input_mask, -1), tf.float32)
num_to_predict = tf.maximum(1, tf.minimum(
N, tf.cast(tf.round(num_tokens * mask_prob), tf.int32)))
masked_lm_weights = tf.cast(
tf.sequence_mask(num_to_predict, N), tf.float32)
if already_masked is not None:
masked_lm_weights *= (1 - already_masked)
# Get a probability of masking each position in the sequence
candidate_mask_float = tf.cast(candidates_mask, tf.float32)
sample_prob = (proposal_distribution * candidate_mask_float)
sample_prob /= tf.reduce_sum(sample_prob, axis=-1, keepdims=True)
# Sample the positions to mask out
sample_prob = tf.stop_gradient(sample_prob)
sample_logits = tf.log(sample_prob)
masked_lm_positions = tf.random.categorical(
sample_logits, N, dtype=tf.int32)
masked_lm_positions *= tf.cast(masked_lm_weights, tf.int32)
# Get the ids of the masked-out tokens
shift = tf.expand_dims(L * tf.range(B), -1)
flat_positions = tf.reshape(masked_lm_positions + shift, [-1, 1])
masked_lm_ids = tf.gather_nd(tf.reshape(inputs.input_ids, [-1]),
flat_positions)
masked_lm_ids = tf.reshape(masked_lm_ids, [B, -1])
masked_lm_ids *= tf.cast(masked_lm_weights, tf.int32)
# Update the input ids
replace_with_mask_positions = masked_lm_positions * tf.cast(
tf.less(tf.random.uniform([B, N]), 0.85), tf.int32)
inputs_ids, _ = scatter_update(
inputs.input_ids, tf.fill([B, N], vocab["[MASK]"]),
replace_with_mask_positions)
return pretrain_data.get_updated_inputs(
inputs,
input_ids=tf.stop_gradient(inputs_ids),
masked_lm_positions=masked_lm_positions,
masked_lm_ids=masked_lm_ids,
masked_lm_weights=masked_lm_weights
)
def compute_mel_filterbank_features(waveforms,
sample_rate=16000,
dither=1.0 / np.iinfo(np.int16).max,
preemphasis=0.97,
frame_length=25,
frame_step=10,
fft_length=None,
window_fn=functools.partial(
tf.signal.hann_window, periodic=True),
lower_edge_hertz=80.0,
upper_edge_hertz=7600.0,
num_mel_bins=80,
log_noise_floor=1e-3,
apply_mask=True):
"""Implement mel-filterbank extraction using tf ops.
Args:
waveforms: float32 tensor with shape [batch_size, max_len]
sample_rate: sampling rate of the waveform
dither: stddev of Gaussian noise added to waveform to prevent quantization
artefacts
preemphasis: waveform high-pass filtering constant
frame_length: frame length in ms
frame_step: frame_Step in ms
fft_length: number of fft bins
window_fn: windowing function
lower_edge_hertz: lowest frequency of the filterbank
upper_edge_hertz: highest frequency of the filterbank
num_mel_bins: filterbank size
log_noise_floor: clip small values to prevent numeric overflow in log
apply_mask: When working on a batch of samples, set padding frames to zero
Returns:
filterbanks: a float32 tensor with shape [batch_size, len, num_bins, 1]
"""
# `stfts` is a complex64 Tensor representing the short-time Fourier
# Transform of each signal in `signals`. Its shape is
# [batch_size, ?, fft_unique_bins]
# where fft_unique_bins = fft_length // 2 + 1
# Find the wave length: the largest index for which the value is !=0
# note that waveforms samples that are exactly 0.0 are quite common, so
# simply doing sum(waveforms != 0, axis=-1) will not work correctly.
wav_lens = tf.reduce_max(
tf.expand_dims(tf.range(tf.shape(waveforms)[1]), 0) *
tf.to_int32(tf.not_equal(waveforms, 0.0)),
axis=-1) + 1
if dither > 0:
waveforms += tf.random_normal(tf.shape(waveforms), stddev=dither)
if preemphasis > 0:
waveforms = waveforms[:, 1:] - preemphasis * waveforms[:, :-1]
wav_lens -= 1
frame_length = int(frame_length * sample_rate / 1e3)
frame_step = int(frame_step * sample_rate / 1e3)
if fft_length is None:
fft_length = int(2**(np.ceil(np.log2(frame_length))))
stfts = tf.signal.stft(waveforms,
frame_length=frame_length,
frame_step=frame_step,
fft_length=fft_length,
window_fn=window_fn,
pad_end=True)
stft_lens = (wav_lens + (frame_step - 1)) // frame_step
masks = tf.to_float(
tf.less_equal(tf.expand_dims(tf.range(tf.shape(stfts)[1]), 0),
tf.expand_dims(stft_lens, 1)))
# An energy spectrogram is the magnitude of the complex-valued STFT.
# A float32 Tensor of shape [batch_size, ?, 257].
magnitude_spectrograms = tf.abs(stfts)
# Warp the linear-scale, magnitude spectrograms into the mel-scale.
num_spectrogram_bins = magnitude_spectrograms.shape[-1].value
linear_to_mel_weight_matrix = (tf.signal.linear_to_mel_weight_matrix(
num_mel_bins, num_spectrogram_bins, sample_rate, lower_edge_hertz,
upper_edge_hertz))
mel_spectrograms = tf.tensordot(magnitude_spectrograms,
linear_to_mel_weight_matrix, 1)
# Note: Shape inference for tensordot does not currently handle this case.
mel_spectrograms.set_shape(magnitude_spectrograms.shape[:-1].concatenate(
linear_to_mel_weight_matrix.shape[-1:]))
log_mel_sgram = tf.log(tf.maximum(log_noise_floor, mel_spectrograms))
if apply_mask:
log_mel_sgram *= tf.expand_dims(tf.to_float(masks), -1)
return tf.expand_dims(log_mel_sgram, -1, name="mel_sgrams")
def make_graph(ops, op_types, interpreter):
height = 144
width = 256
tensors = {}
input_details = interpreter.get_input_details()
# output_details = interpreter.get_output_details()
print(input_details)
for input_detail in input_details:
tensors[input_detail['index']] = tf.placeholder(
dtype=input_detail['dtype'],
shape=input_detail['shape'],
name=input_detail['name'])
for op in ops:
print('@@@@@@@@@@@@@@ op:', op)
op_type = op_types[op['opcode_index']]
if op_type == 'CONV_2D':
input_tensor = tensors[op['inputs'][0]]
weights = tensors[op['inputs'][1]].transpose(1, 2, 3, 0)
bias = tensors[op['inputs'][2]]
output_detail = interpreter._get_tensor_details(op['outputs'][0])
options = op['builtin_options']
output_tensor = tf.nn.conv2d(
input_tensor,
weights,
strides=[1, options['stride_h'], options['stride_w'], 1],
padding=options['padding'],
dilations=[
1, options['dilation_h_factor'],
options['dilation_w_factor'], 1
],
name=output_detail['name'] + '/conv2d')
output_tensor = tf.add(output_tensor,
bias,
name=output_detail['name'])
if output_detail['name'].split('/')[-1] == 'Relu6':
output_tensor = tf.nn.relu6(output_tensor)
tensors[output_detail['index']] = output_tensor
elif op_type == 'DEPTHWISE_CONV_2D':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
weights = tensors[op['inputs'][1]].transpose(1, 2, 3, 0)
bias = tensors[op['inputs'][2]]
options = op['builtin_options']
output_tensor = tf.nn.depthwise_conv2d(
input_tensor,
weights,
strides=[1, options['stride_h'], options['stride_w'], 1],
padding=options['padding'],
# dilations=[1, options['dilation_h_factor'], options['dilation_w_factor'], 1],
name=output_detail['name'] + '/depthwise_conv2d')
output_tensor = tf.add(output_tensor,
bias,
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'MAX_POOL_2D':
input_tensor = tensors[op['inputs'][0]]
output_detail = interpreter._get_tensor_details(op['outputs'][0])
options = op['builtin_options']
output_tensor = tf.nn.max_pool(
input_tensor,
ksize=[
1, options['filter_height'], options['filter_width'], 1
],
strides=[1, options['stride_h'], options['stride_w'], 1],
padding=options['padding'],
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'PAD':
input_tensor = tensors[op['inputs'][0]]
output_detail = interpreter._get_tensor_details(op['outputs'][0])
paddings_detail = interpreter._get_tensor_details(op['inputs'][1])
paddings_array = interpreter.get_tensor(paddings_detail['index'])
paddings = tf.Variable(paddings_array,
name=paddings_detail['name'])
output_tensor = tf.pad(input_tensor,
paddings,
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'RELU':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
output_tensor = tf.nn.relu(input_tensor,
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'PRELU':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
alpha_detail = interpreter._get_tensor_details(op['inputs'][1])
alpha_array = interpreter.get_tensor(alpha_detail['index'])
with tf.variable_scope(name_or_scope=output_detail['name']):
alphas = tf.Variable(alpha_array, name=alpha_detail['name'])
output_tensor = tf.maximum(alphas * input_tensor, input_tensor)
tensors[output_detail['index']] = output_tensor
elif op_type == 'RELU6':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
output_tensor = tf.nn.relu6(input_tensor,
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'RESHAPE':
input_tensor = tensors[op['inputs'][0]]
output_detail = interpreter._get_tensor_details(op['outputs'][0])
options = op['builtin_options']
output_tensor = tf.reshape(input_tensor,
options['new_shape'],
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'ADD':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor_0 = tensors[op['inputs'][0]]
try:
input_tensor_1 = tensors[op['inputs'][1]]
except:
param = interpreter._get_tensor_details(op['inputs'][1])
input_tensor_1 = interpreter.get_tensor(param['index'])
output_tensor = tf.add(input_tensor_0,
input_tensor_1,
name=output_detail['name'])
if output_detail['name'].split('/')[-1] == 'Relu6':
output_tensor = tf.nn.relu6(output_tensor)
tensors[output_detail['index']] = output_tensor
elif op_type == 'CONCATENATION':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor_0 = tensors[op['inputs'][0]]
input_tensor_1 = tensors[op['inputs'][1]]
try:
input_tensor_2 = tensors[op['inputs'][2]]
options = op['builtin_options']
output_tensor = tf.concat(
[input_tensor_0, input_tensor_1, input_tensor_2],
options['axis'],
name=output_detail['name'])
except:
options = op['builtin_options']
output_tensor = tf.concat([input_tensor_0, input_tensor_1],
options['axis'],
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'LOGISTIC':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
output_tensor = tf.math.sigmoid(input_tensor,
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'TRANSPOSE_CONV':
input_tensor = tensors[op['inputs'][2]]
weights_detail = interpreter._get_tensor_details(op['inputs'][1])
output_shape_detail = interpreter._get_tensor_details(
op['inputs'][0])
output_detail = interpreter._get_tensor_details(op['outputs'][0])
weights_array = interpreter.get_tensor(weights_detail['index'])
weights_array = np.transpose(weights_array, (1, 2, 0, 3))
output_shape_array = interpreter.get_tensor(
output_shape_detail['index'])
weights = tf.Variable(weights_array, name=weights_detail['name'])
shape = tf.Variable(output_shape_array,
name=output_shape_detail['name'])
options = op['builtin_options']
output_tensor = tf.nn.conv2d_transpose(
input_tensor,
weights,
shape, [1, options['stride_h'], options['stride_w'], 1],
padding=options['padding'],
name=output_detail['name'] + '/conv2d_transpose')
tensors[output_detail['index']] = output_tensor
elif op_type == 'MUL':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor_0 = tensors[op['inputs'][0]]
input_tensor_1 = None
try:
input_tensor_1 = tensors[op['inputs'][1]]
except:
param = interpreter._get_tensor_details(op['inputs'][1])
input_tensor_1 = interpreter.get_tensor(param['index'])
output_tensor = tf.multiply(input_tensor_0,
input_tensor_1,
name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'HARD_SWISH':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
output_tensor = optimizing_hardswish_for_edgetpu(
input_tensor, name=output_detail['name'])
tensors[output_detail['index']] = output_tensor
elif op_type == 'AVERAGE_POOL_2D':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
options = op['builtin_options']
pool_size = [options['filter_height'], options['filter_width']]
strides = [options['stride_h'], options['stride_w']]
padding = options['padding']
output_tensor = tf.keras.layers.AveragePooling2D(
pool_size=pool_size,
strides=strides,
padding=padding,
name=output_detail['name'])(input_tensor)
tensors[output_detail['index']] = output_tensor
elif op_type == 'FULLY_CONNECTED':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
weights = tensors[op['inputs'][1]].transpose(1, 0)
bias = tensors[op['inputs'][2]]
output_shape_detail = interpreter._get_tensor_details(
op['inputs'][0])
output_shape_array = interpreter.get_tensor(
output_shape_detail['index'])
output_tensor = tf.keras.layers.Dense(
units=output_shape_array.shape[3],
use_bias=True,
kernel_initializer=tf.keras.initializers.Constant(weights),
bias_initializer=tf.keras.initializers.Constant(bias))(
input_tensor)
tensors[output_detail['index']] = output_tensor
elif op_type == 'RESIZE_BILINEAR':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
input_tensor = tensors[op['inputs'][0]]
size_detail = interpreter._get_tensor_details(op['inputs'][1])
size = interpreter.get_tensor(size_detail['index'])
size_height = size[0]
size_width = size[1]
def upsampling2d_bilinear(x, size_height, size_width):
if optimizing_for_edgetpu_flg:
return tf.image.resize_bilinear(x,
(size_height, size_width))
else:
return tfv2.image.resize(x, [size_height, size_width],
method='bilinear')
output_tensor = tf.keras.layers.Lambda(upsampling2d_bilinear,
arguments={
'size_height':
size_height,
'size_width': size_width
})(input_tensor)
tensors[output_detail['index']] = output_tensor
elif op_type == 'DEQUANTIZE':
output_detail = interpreter._get_tensor_details(op['outputs'][0])
weights_detail = interpreter._get_tensor_details(op['inputs'][0])
weights = interpreter.get_tensor(weights_detail['index'])
output_tensor = weights.astype(np.float32)
tensors[output_detail['index']] = output_tensor
else:
raise ValueError(op_type)
# Convolution2DTransposeBias
input_tensor = tensors[241]
weights = np.load('weights/segment_Kernel').transpose(1, 2, 0,
3).astype(np.float32)
bias = np.load('weights/segment_Bias').astype(np.float32)
custom_trans = tf.nn.conv2d_transpose(input=input_tensor,
filters=weights,
output_shape=[1, height, width, 2],
strides=[2, 2],
padding='SAME',
dilations=[1, 1])
output_tensor = tf.math.add(custom_trans, bias, name='segment')
tensors[999] = output_tensor
def _body(i, posterior, center, wx, activation_biases, sigma_biases,
input_activation, tile_filter):
"""Body of EM while loop."""
tf.logging.info(' Wx: %s', wx)
beta = final_beta * (1 - tf.pow(0.95, tf.cast(i + 1, tf.float32)))
posterior = tf.Print(posterior, [
layer_name, i, h, ih,
tf.reduce_min(posterior),
tf.reduce_max(posterior)
],
message='posterior')
# route: [outdim, height?, width?, batch, indim]
with tf.name_scope('vote_conf'):
vote_conf = posterior * input_activation
vote_conf = tf.maximum(vote_conf, 0.0)
# masses: [batch, 1, outdim, 1, height, width, 1, 1]
with tf.name_scope('masses'):
masses = tf.reduce_sum(vote_conf,
axis=[1, -1, -2],
keepdims=True,
name='masses_calculation') + 0.0000001
with tf.name_scope('preactivate_unrolled'):
preactivate_unrolled = vote_conf * wx
# center: [batch, 1, outdim, outatom, height, width]
with tf.name_scope('center'):
center = .9 * tf.reduce_sum(
preactivate_unrolled, axis=[1, -1, -2],
keepdims=True) / masses + .1 * center
# Rematerialization to save GPU memory. (+22ms/-1.6GB)
# @tf.contrib.layers.recompute_grad
def compute_noise_and_variance(wx, center, vote_conf, masses):
noise = tf.squared_difference(wx, center)
variance = min_var + tf.reduce_sum(
vote_conf * noise,
axis=[1, -1, -2],
keepdims=True,
name='variance_calculation') / masses
return noise, variance
with tf.name_scope('compute_noise_and_variance'):
noise, variance = compute_noise_and_variance(
wx, center, vote_conf, masses)
with tf.name_scope('win'):
log_variance = tf.log(variance)
p_i = -1 * tf.reduce_sum(log_variance, axis=3, keepdims=True)
log_2pi = tf.log(2 * math.pi)
sigma_b = tf.log(sigma_biases * sigma_biases + min_var)
win = masses * (p_i - num_out_atoms *
(sigma_b + log_2pi + 1.0))
with tf.name_scope('logit'):
logit = beta * (win - activation_biases * 50 * num_out_atoms)
with tf.name_scope('activation_update'):
activation_update = tf.minimum(
0.0, logit) - tf.log(1 + tf.exp(-tf.abs(logit)))
with tf.name_scope('sigma_update'):
log_det_sigma = -1 * p_i
sigma_update = (num_out_atoms * log_2pi + log_det_sigma) / 2.0
with tf.name_scope('exp_update'):
exp_update = tf.reduce_sum(noise / (2 * variance),
axis=3,
keep_dims=True)
prior_update = tf.subtract(activation_update - sigma_update,
exp_update,
name='prior_update_sub')
max_prior_update = tf.reduce_max(prior_update,
axis=[2, 3, 4, 5, 6, 7],
keepdims=True,
name='max_prior_opdate')
prior_normal = tf.add(prior_update, -1 * max_prior_update)
prior_exp = tf.exp(prior_normal)
prior_exp_out = tf.reduce_sum(prior_exp,
axis=2,
keepdims=True,
name='prior_exp_out')
prior_exp_reshape = tf.reshape(prior_exp_out, [-1, h, h, k * k],
name='prior_exp_reshape')
sum_prior = tf.nn.conv2d_transpose(prior_exp_reshape,
tile_filter,
output_shape=[b * c, ih, ih, 1],
strides=[1, s, s, 1],
padding='VALID')
sum_prior = tf.maximum(1e-6, sum_prior)
sum_prior_patch = utils.kernel_tile(sum_prior,
k,
s,
1,
name='sum_prior_patch')
with utils.maybe_jit_scope(), tf.name_scope('posterior'):
sum_prior_reshape = tf.reshape(
sum_prior_patch, [-1, input_dim, 1, 1, h, h, k, k])
posterior = prior_exp / sum_prior_reshape
return (i + 1, posterior, logit, center, masses)
def prepare_model(self):
# input rating vector
self.input_R_U = tf.placeholder(dtype=tf.float32,
shape=[None, self.num_cols],
name="input_R_U")
self.input_R_I = tf.placeholder(dtype=tf.float32,
shape=[self.num_rows, None],
name="input_R_I")
self.input_OH_I = tf.placeholder(dtype=tf.float32,
shape=[None, self.num_cols],
name="input_OH_I")
self.input_P_cor = tf.placeholder(dtype=tf.int32,
shape=[None, 2],
name="input_P_cor")
self.input_N_cor = tf.placeholder(dtype=tf.int32,
shape=[None, 2],
name="input_N_cor")
# input indicator vector indicator
self.row_idx = tf.placeholder(dtype=tf.int32,
shape=[None, 1],
name="row_idx")
self.col_idx = tf.placeholder(dtype=tf.int32,
shape=[None, 1],
name="col_idx")
# user component
# first layer weights
UV = tf.get_variable(name="UV",
initializer=tf.truncated_normal(
shape=[self.num_cols, self.U_hidden_neuron],
mean=0,
stddev=0.03),
dtype=tf.float32)
# second layer weights
UW = tf.get_variable(name="UW",
initializer=tf.truncated_normal(
shape=[self.U_hidden_neuron, self.num_cols],
mean=0,
stddev=0.03),
dtype=tf.float32)
# first layer bias
Ub1 = tf.get_variable(name="Ub1",
initializer=tf.truncated_normal(
shape=[1, self.U_hidden_neuron],
mean=0,
stddev=0.03),
dtype=tf.float32)
# second layer bias
Ub2 = tf.get_variable(name="Ub2",
initializer=tf.truncated_normal(
shape=[1, self.num_cols],
mean=0,
stddev=0.03),
dtype=tf.float32)
# item component
# first layer weights
IV = tf.get_variable(name="IV",
initializer=tf.truncated_normal(
shape=[self.num_rows, self.I_hidden_neuron],
mean=0,
stddev=0.03),
dtype=tf.float32)
# second layer weights
IW = tf.get_variable(name="IW",
initializer=tf.truncated_normal(
shape=[self.I_hidden_neuron, self.num_rows],
mean=0,
stddev=0.03),
dtype=tf.float32)
# first layer bias
Ib1 = tf.get_variable(name="Ib1",
initializer=tf.truncated_normal(
shape=[1, self.I_hidden_neuron],
mean=0,
stddev=0.03),
dtype=tf.float32)
# second layer bias
Ib2 = tf.get_variable(name="Ib2",
initializer=tf.truncated_normal(
shape=[1, self.num_rows],
mean=0,
stddev=0.03),
dtype=tf.float32)
I_factor_vector = tf.get_variable(
name="I_factor_vector",
initializer=tf.random_uniform(shape=[1, self.num_cols]),
dtype=tf.float32)
# user component
U_pre_Encoder = tf.matmul(self.input_R_U,
UV) + Ub1 # input to the hidden layer
self.U_Encoder = self.g_act(
U_pre_Encoder) # output of the hidden layer
U_pre_Decoder = tf.matmul(self.U_Encoder,
UW) + Ub2 # input to the output layer
self.U_Decoder = self.f_act(
U_pre_Decoder) # output of the output layer
# item component
I_pre_mul = tf.transpose(
tf.matmul(I_factor_vector, tf.transpose(self.input_OH_I)))
I_pre_Encoder = tf.matmul(tf.transpose(self.input_R_I),
IV) + Ib1 # input to the hidden layer
self.I_Encoder = self.g_act(I_pre_Encoder *
I_pre_mul) # output of the hidden layer
I_pre_Decoder = tf.matmul(self.I_Encoder,
IW) + Ib2 # input to the output layer
self.I_Decoder = self.f_act(
I_pre_Decoder) # output of the output layer
# final output
self.Decoder = (
(tf.transpose(
tf.gather_nd(tf.transpose(self.U_Decoder), self.col_idx))) +
tf.gather_nd(tf.transpose(self.I_Decoder), self.row_idx)) / 2.0
pos_data = tf.gather_nd(self.Decoder, self.input_P_cor)
neg_data = tf.gather_nd(self.Decoder, self.input_N_cor)
pre_cost1 = tf.maximum(neg_data - pos_data + self.margin,
tf.zeros(tf.shape(neg_data)[0]))
cost1 = tf.reduce_sum(pre_cost1) # prediction squared error
pre_cost2 = tf.square(self.l2_norm(UW)) + tf.square(self.l2_norm(UV)) \
+ tf.square(self.l2_norm(IW)) + tf.square(self.l2_norm(IV))\
+ tf.square(self.l2_norm(Ib1)) + tf.square(self.l2_norm(Ib2))\
+ tf.square(self.l2_norm(Ub1)) + tf.square(self.l2_norm(Ub2))
cost2 = self.lambda_value * 0.5 * pre_cost2 # regularization term
self.cost = cost1 + cost2 # the loss function
if self.optimizer_method == "Adam":
optimizer = tf.train.AdamOptimizer(self.lr)
elif self.optimizer_method == "Adadelta":
optimizer = tf.train.AdadeltaOptimizer(self.lr)
elif self.optimizer_method == "Adagrad":
optimizer = tf.train.AdadeltaOptimizer(self.lr)
elif self.optimizer_method == "RMSProp":
optimizer = tf.train.RMSPropOptimizer(self.lr)
elif self.optimizer_method == "GradientDescent":
optimizer = tf.train.GradientDescentOptimizer(self.lr)
elif self.optimizer_method == "Momentum":
optimizer = tf.train.MomentumOptimizer(self.lr, 0.9)
else:
raise ValueError("Optimizer Key ERROR")
gvs = optimizer.compute_gradients(self.cost)
self.optimizer = optimizer.apply_gradients(
gvs, global_step=self.global_step)
def __init__(self, environment, summary_dir="./"):
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3'
config = tf.ConfigProto(log_device_placement=False,
device_count={'GPU': True})
config.gpu_options.per_process_gpu_memory_fraction = 0.1
self.state_size, self.action_size = environment.observation_space.shape, environment.action_space.shape[
0]
self.action_bound_high = environment.action_space.high
self.action_bound_low = environment.action_space.low
self.actions = tf.placeholder(tf.float32, [None, self.action_size],
'action')
self.beta = 0.01
self.learning_rate = 0.0001
self.minibatch = 32
self.epsilon = 0.21
self.critic_coefficient = 0.5
self.l2_regular = 0.001
self.sess = tf.Session(config=config)
self.state = tf.placeholder(tf.float32, [None, 64, 64, 4], 'state')
self.advantage = tf.placeholder(tf.float32, [None, 1], 'advantage')
self.rewards = tf.placeholder(tf.float32, [None, 1], 'd_rewards')
self.dataset = tf.data.Dataset.from_tensor_slices({
"state":
self.state,
"actions":
self.actions,
"rewards":
self.rewards,
"advantage":
self.advantage
})
self.dataset = self.dataset.shuffle(buffer_size=10000)
self.dataset = self.dataset.batch(self.minibatch)
self.dataset = self.dataset.cache()
self.dataset = self.dataset.repeat(4)
self.iterator = self.dataset.make_initializable_iterator()
batch = self.iterator.get_next()
old_policy, old_policy_params = self.Actor(batch["state"], 'oldpolicy')
policy, policy_params = self.Actor(batch["state"], 'policy')
policy_eval, _ = self.Actor(self.state, 'policy', reuse=True)
old_value, old_value_params = self.Critic(batch["state"], "oldvalue")
self.value, value_params = self.Critic(batch["state"], "value")
self.value_eval, _ = self.Critic(self.state, 'value', reuse=True)
self.sample_action = tf.squeeze(policy_eval.sample(1),
axis=0,
name="sample_action")
self.global_step = tf.train.get_or_create_global_step()
self.saver = tf.train.Saver()
with tf.variable_scope('loss'):
with tf.variable_scope('actor'):
ratio = tf.maximum(policy.prob(batch["actions"]),
1e-6) / tf.maximum(
old_policy.prob(batch["actions"]), 1e-6)
ratio = tf.clip_by_value(ratio, 0, 10)
surr1 = batch["advantage"] * ratio
surr2 = batch["advantage"] * tf.clip_by_value(
ratio, 1 - self.epsilon, 1 + self.epsilon)
loss_policy = -tf.reduce_mean(tf.minimum(surr1, surr2))
tf.summary.scalar("loss", loss_policy)
with tf.variable_scope('critic'):
loss_actor = tf.reduce_mean(
tf.square(self.value - batch["rewards"])) * 0.5
tf.summary.scalar("loss", loss_actor)
with tf.variable_scope('entropy'):
entropy = policy.entropy()
pol_entpen = -self.beta * tf.reduce_mean(entropy)
loss = loss_policy + loss_actor * self.critic_coefficient + pol_entpen
tf.summary.scalar("total", loss)
with tf.variable_scope('train'):
opt = tf.train.AdamOptimizer(self.learning_rate)
self.trainer = opt.minimize(loss,
global_step=self.global_step,
var_list=policy_params + value_params)
with tf.variable_scope('update_old'):
self.update_old_policy_op = [
oldp.assign(p)
for p, oldp in zip(policy_params, old_policy_params)
]
self.update_old_value_op = [
oldp.assign(p)
for p, oldp in zip(value_params, old_value_params)
]
self.writer = tf.summary.FileWriter(summary_dir, self.sess.graph)
self.sess.run(tf.global_variables_initializer())
tf.summary.scalar("value", tf.reduce_mean(self.value))
tf.summary.scalar("policy_entropy", tf.reduce_mean(entropy))
tf.summary.scalar("sigma", tf.reduce_mean(policy.stddev()))
self.board = tf.summary.merge(tf.get_collection(
tf.GraphKeys.SUMMARIES))
def resize_image(image, bboxes=None, min_size=None, max_size=None):
"""
We need to resize image and (optionally) bounding boxes when the biggest
side dimension is bigger than `max_size` or when the smaller side is
smaller than `min_size`. If no max_size defined it won't scale down and if
no min_size defined it won't scale up.
Then, using the ratio we used, we need to properly scale the bounding
boxes.
Args:
image: Tensor with image of shape (H, W, 3).
bboxes: Optional Tensor with bounding boxes with shape (num_bboxes, 5).
where we have (x_min, y_min, x_max, y_max, label) for each one.
min_size: Min size of width or height.
max_size: Max size of width or height.
Returns:
Dictionary containing:
image: Tensor with scaled image.
bboxes: Tensor with scaled (using the same factor as the image)
bounding boxes with shape (num_bboxes, 5).
scale_factor: Scale factor used to modify the image (1.0 means no
change).
"""
image_shape = tf.to_float(tf.shape(image))
height = image_shape[0]
width = image_shape[1]
if min_size is not None:
# We calculate the upscale factor, the rate we need to use to end up
# with an image with it's lowest dimension at least `image_min_size`.
# In case of being big enough the scale factor is 1. (no change)
min_size = tf.to_float(min_size)
min_dimension = tf.minimum(height, width)
upscale_factor = tf.maximum(min_size / min_dimension, 1.0)
else:
upscale_factor = tf.constant(1.0)
if max_size is not None:
# We do the same calculating the downscale factor, to end up with an
# image where the biggest dimension is less than `image_max_size`.
# When the image is small enough the scale factor is 1. (no change)
max_size = tf.to_float(max_size)
max_dimension = tf.maximum(height, width)
downscale_factor = tf.minimum(max_size / max_dimension, 1.0)
else:
downscale_factor = tf.constant(1.0)
scale_factor = upscale_factor * downscale_factor
# New size is calculate using the scale factor and rounding to int.
new_height = height * scale_factor
new_width = width * scale_factor
# Resize image using TensorFlow's own `resize_image` utility.
image = tf.image.resize_images(image,
tf.stack(
tf.to_int32([new_height, new_width])),
method=tf.image.ResizeMethod.BILINEAR)
if bboxes is not None:
bboxes = adjust_bboxes(bboxes,
old_height=height,
old_width=width,
new_height=new_height,
new_width=new_width)
return {
"image": image,
"bboxes": bboxes,
"scale_factor": scale_factor,
}
return {
"image": image,
"scale_factor": scale_factor,
}
def call(self, x):
input_image, y_pred, y_true, true_boxes = x
# adjust the shape of the y_predict [batch, grid_h, grid_w, 3, 4+1+nb_class]
y_pred = tf.reshape(
y_pred,
tf.concat([tf.shape(input=y_pred)[:3],
tf.constant([3, -1])],
axis=0))
# initialize the masks
object_mask = tf.expand_dims(y_true[..., 4], 4)
# the variable to keep track of number of batches processed
batch_seen = tf.Variable(0.)
# compute grid factor and net factor
grid_h = tf.shape(input=y_true)[1]
grid_w = tf.shape(input=y_true)[2]
grid_factor = tf.reshape(tf.cast([grid_w, grid_h], tf.float32),
[1, 1, 1, 1, 2])
net_h = tf.shape(input=input_image)[1]
net_w = tf.shape(input=input_image)[2]
net_factor = tf.reshape(tf.cast([net_w, net_h], tf.float32),
[1, 1, 1, 1, 2])
"""
Adjust prediction
"""
pred_box_xy = (self.cell_grid[:, :grid_h, :grid_w, :, :] +
tf.sigmoid(y_pred[..., :2])) # sigma(t_xy) + c_xy
pred_box_wh = y_pred[..., 2:4] # t_wh
pred_box_conf = tf.expand_dims(tf.sigmoid(y_pred[..., 4]),
4) # adjust confidence
pred_box_class = y_pred[..., 5:] # adjust class probabilities
"""
Adjust ground truth
"""
true_box_xy = y_true[..., 0:2] # (sigma(t_xy) + c_xy)
true_box_wh = y_true[..., 2:4] # t_wh
true_box_conf = tf.expand_dims(y_true[..., 4], 4)
true_box_class = tf.argmax(input=y_true[..., 5:], axis=-1)
"""
Compare each predicted box to all true boxes
"""
# initially, drag all objectness of all boxes to 0
conf_delta = pred_box_conf - 0
# then, ignore the boxes which have good overlap with some true box
true_xy = true_boxes[..., 0:2] / grid_factor
true_wh = true_boxes[..., 2:4] / net_factor
true_wh_half = true_wh / 2.
true_mins = true_xy - true_wh_half
true_maxes = true_xy + true_wh_half
pred_xy = tf.expand_dims(pred_box_xy / grid_factor, 4)
pred_wh = tf.expand_dims(
tf.exp(pred_box_wh) * self.anchors / net_factor, 4)
pred_wh_half = pred_wh / 2.
pred_mins = pred_xy - pred_wh_half
pred_maxes = pred_xy + pred_wh_half
intersect_mins = tf.maximum(pred_mins, true_mins)
intersect_maxes = tf.minimum(pred_maxes, true_maxes)
intersect_wh = tf.maximum(intersect_maxes - intersect_mins, 0.)
intersect_areas = intersect_wh[..., 0] * intersect_wh[..., 1]
true_areas = true_wh[..., 0] * true_wh[..., 1]
pred_areas = pred_wh[..., 0] * pred_wh[..., 1]
union_areas = pred_areas + true_areas - intersect_areas
iou_scores = tf.truediv(intersect_areas, union_areas)
best_ious = tf.reduce_max(input_tensor=iou_scores, axis=4)
conf_delta *= tf.expand_dims(
tf.cast(best_ious < self.ignore_thresh, dtype=tf.float32), 4)
"""
Compute some online statistics
"""
true_xy = true_box_xy / grid_factor
true_wh = tf.exp(true_box_wh) * self.anchors / net_factor
true_wh_half = true_wh / 2.
true_mins = true_xy - true_wh_half
true_maxes = true_xy + true_wh_half
pred_xy = pred_box_xy / grid_factor
pred_wh = tf.exp(pred_box_wh) * self.anchors / net_factor
pred_wh_half = pred_wh / 2.
pred_mins = pred_xy - pred_wh_half
pred_maxes = pred_xy + pred_wh_half
intersect_mins = tf.maximum(pred_mins, true_mins)
intersect_maxes = tf.minimum(pred_maxes, true_maxes)
intersect_wh = tf.maximum(intersect_maxes - intersect_mins, 0.)
intersect_areas = intersect_wh[..., 0] * intersect_wh[..., 1]
true_areas = true_wh[..., 0] * true_wh[..., 1]
pred_areas = pred_wh[..., 0] * pred_wh[..., 1]
union_areas = pred_areas + true_areas - intersect_areas
iou_scores = tf.truediv(intersect_areas, union_areas)
iou_scores = object_mask * tf.expand_dims(iou_scores, 4)
count = tf.reduce_sum(input_tensor=object_mask)
count_noobj = tf.reduce_sum(input_tensor=1 - object_mask)
detect_mask = tf.cast((pred_box_conf * object_mask) >= 0.5,
dtype=tf.float32)
class_mask = tf.expand_dims(
tf.cast(tf.equal(tf.argmax(input=pred_box_class, axis=-1),
true_box_class),
dtype=tf.float32), 4)
recall50 = tf.reduce_sum(
input_tensor=tf.cast(iou_scores >= 0.5, dtype=tf.float32) *
detect_mask * class_mask) / (count + 1e-3)
recall75 = tf.reduce_sum(
input_tensor=tf.cast(iou_scores >= 0.75, dtype=tf.float32) *
detect_mask * class_mask) / (count + 1e-3)
avg_iou = tf.reduce_sum(input_tensor=iou_scores) / (count + 1e-3)
avg_obj = tf.reduce_sum(input_tensor=pred_box_conf *
object_mask) / (count + 1e-3)
avg_noobj = tf.reduce_sum(input_tensor=pred_box_conf *
(1 - object_mask)) / (count_noobj + 1e-3)
avg_cat = tf.reduce_sum(input_tensor=object_mask *
class_mask) / (count + 1e-3)
"""
Warm-up training
"""
batch_seen = tf.assign_add(batch_seen, 1.)
true_box_xy, true_box_wh, xywh_mask = tf.cond(
pred=tf.less(batch_seen, self.warmup_batches + 1),
true_fn=lambda: [
true_box_xy +
(0.5 + self.cell_grid[:, :grid_h, :grid_w, :, :]) *
(1 - object_mask), true_box_wh + tf.zeros_like(true_box_wh) *
(1 - object_mask),
tf.ones_like(object_mask)
],
false_fn=lambda: [true_box_xy, true_box_wh, object_mask])
"""
Compare each true box to all anchor boxes
"""
wh_scale = tf.exp(true_box_wh) * self.anchors / net_factor
wh_scale = tf.expand_dims(
2 - wh_scale[..., 0] * wh_scale[..., 1],
axis=4) # the smaller the box, the bigger the scale
xy_delta = xywh_mask * (pred_box_xy -
true_box_xy) * wh_scale * self.xywh_scale
wh_delta = xywh_mask * (pred_box_wh -
true_box_wh) * wh_scale * self.xywh_scale
conf_delta = object_mask * (
pred_box_conf - true_box_conf) * self.obj_scale + (
1 - object_mask) * conf_delta * self.noobj_scale
class_delta = object_mask * \
tf.expand_dims(tf.nn.sparse_softmax_cross_entropy_with_logits(labels=true_box_class, logits=pred_box_class), 4) * \
self.class_scale
loss_xy = tf.reduce_sum(input_tensor=tf.square(xy_delta),
axis=list(range(1, 5)))
loss_wh = tf.reduce_sum(input_tensor=tf.square(wh_delta),
axis=list(range(1, 5)))
loss_conf = tf.reduce_sum(input_tensor=tf.square(conf_delta),
axis=list(range(1, 5)))
loss_class = tf.reduce_sum(input_tensor=class_delta,
axis=list(range(1, 5)))
loss = loss_xy + loss_wh + loss_conf + loss_class
loss = tf.Print(loss, [grid_h, avg_obj],
message='avg_obj \t\t',
summarize=1000)
loss = tf.Print(loss, [grid_h, avg_noobj],
message='avg_noobj \t\t',
summarize=1000)
loss = tf.Print(loss, [grid_h, avg_iou],
message='avg_iou \t\t',
summarize=1000)
loss = tf.Print(loss, [grid_h, avg_cat],
message='avg_cat \t\t',
summarize=1000)
loss = tf.Print(loss, [grid_h, recall50],
message='recall50 \t',
summarize=1000)
loss = tf.Print(loss, [grid_h, recall75],
message='recall75 \t',
summarize=1000)
loss = tf.Print(loss, [grid_h, count],
message='count \t',
summarize=1000)
loss = tf.Print(loss, [
grid_h,
tf.reduce_sum(input_tensor=loss_xy),
tf.reduce_sum(input_tensor=loss_wh),
tf.reduce_sum(input_tensor=loss_conf),
tf.reduce_sum(input_tensor=loss_class)
],
message='loss xy, wh, conf, class: \t',
summarize=1000)
return loss * self.grid_scale
def last_value_quantize(self,
inputs,
per_channel=False,
init_min=-6.0,
init_max=6.0,
name_prefix='FixedValueQuant',
reuse=None,
is_training=False,
num_bits=8,
narrow_range=False,
relative_quantile=0,
freeze=False,
quant_delay=False):
"""Adds a layer that collects quantization ranges as last input ranges.
LastValueQuantize creates variables called 'min' and 'max', representing the
interval used for quantization and clamping.
Args:
inputs: a tensor containing values to be quantized.
per_channel: (Optional) a boolean specifying whether to use different
quantization ranges per output channel.
init_min: a float scalar, the initial value for variable min.
init_max: a float scalar, the initial value for variable max.
name_prefix: name_prefix for created nodes.
reuse: whether or not the layer and its variables should be reused. To be
able to reuse the layer scope must be given.
is_training: Whether the op is applied to a training or eval graph.
num_bits: Number of bits to use for quantization, must be between 2 and 8.
narrow_range: Whether to use the narrow quantization range
[1; 2^num_bits - 1] or wide range [0; 2^num_bits - 1].
relative_quantile: Specify the location of quantization min and max
parameters. relative_quantile = 0 is equivalent to using min and max
of input; relative_quantile = 1 set min and max the optimal location
assuming the input distribution is uniform. In reality, a good value
should be in the range [0 1].
freeze: If True, the min and max variables are calculated once at the
begining of training and then freeze. This is used for quantized
fine-tuning of a pretrained checkpoint. If False, the min and max are
calculated and updated every cycle.
quant_delay: The number of global steps after which the fake quantization
are turned on. Used for performing fine-tuning experiment without
starting from a pre-trained checkpoint.
Returns:
a tensor containing quantized values.
"""
with tf.variable_scope(
None, default_name=name_prefix, values=[inputs], reuse=reuse) as scope:
scope.set_partitioner(None)
input_shape = inputs.get_shape()
input_dim = len(input_shape)
if per_channel:
# Only support quantizing 1-, 2- and 4-dimensional tensors.
assert input_dim in [1, 2, 4]
min_max_shape = [input_shape[-1]]
else:
min_max_shape = []
min_var = tf.get_variable('min',
min_max_shape,
tf.float32,
initializer=tf.constant_initializer(init_min),
trainable=False)
max_var = tf.get_variable('max',
min_max_shape,
tf.float32,
initializer=tf.constant_initializer(init_max),
trainable=False)
if not is_training:
return self.delayed_quant(
inputs,
min_var,
max_var,
per_channel=per_channel,
num_bits=num_bits,
narrow_range=narrow_range,
quant_delay=None)
if per_channel:
if input_dim == 2:
reduce_dims = [0]
elif input_dim == 4:
reduce_dims = [0, 1, 2]
if num_bits >= 4:
quantile = 0
else:
quantile = (1.0 / 2.0**(num_bits + 1.0)) * relative_quantile * 100
if per_channel:
if input_dim >= 2:
batch_min = tfp.stats.percentile(
inputs, q=quantile, axis=reduce_dims, name='BatchMin')
else:
batch_min = inputs
else:
batch_min = tfp.stats.percentile(
inputs, q=quantile, name='BatchMin')
if per_channel:
if input_dim >= 2:
batch_max = tfp.stats.percentile(
inputs, q=100 - quantile, axis=reduce_dims, name='BatchMax')
else:
batch_max = inputs
else:
batch_max = tfp.stats.percentile(
inputs, q=100 - quantile, name='BatchMax')
if narrow_range:
multiplier = 1.0
else:
multiplier = 1.0 + 1.0 / (2.0**(num_bits-1.0) - 1.0)
batch_abs_max = tf.maximum(tf.abs(batch_min), tf.abs(batch_max))
if narrow_range:
batch_adjusted_min = 0 - batch_abs_max
else:
multiplier = 1.0 + 1.0 / (2.0**(num_bits-1.0) - 1.0)
batch_adjusted_min = 0 - tf.scalar_mul(multiplier, batch_abs_max)
batch_abs_max = tf.cast(batch_abs_max, tf.float32)
batch_adjusted_min = tf.cast(batch_adjusted_min, tf.float32)
if freeze:
def make_var_op(var):
def f():
return var
return f
quant_step = common.CreateOrGetQuantizationStep()
min_max_assign = tf.less_equal(
quant_step, 1, name='MinMaxAssign')
min_value = tf.cond(min_max_assign,
make_var_op(batch_adjusted_min),
make_var_op(min_var),
name='AssignMinCond')
max_value = tf.cond(min_max_assign,
make_var_op(batch_abs_max),
make_var_op(max_var),
name='AssignMaxCond')
else:
min_value = batch_adjusted_min
max_value = batch_abs_max
assign_min = tf.assign(min_var, min_value)
assign_max = tf.assign(max_var, max_value)
return self.delayed_quant(
inputs,
assign_min,
assign_max,
per_channel=per_channel,
num_bits=num_bits,
narrow_range=narrow_range,
quant_delay=quant_delay)
def _compute_model_loss(
self, input_sequence, output_sequence, sequence_length, control_sequence):
"""Builds a model with loss for train/eval."""
hparams = self.hparams
batch_size = hparams.batch_size
input_sequence = tf.to_float(input_sequence)
output_sequence = tf.to_float(output_sequence)
max_seq_len = tf.minimum(tf.shape(output_sequence)[1], hparams.max_seq_len)
input_sequence = input_sequence[:, :max_seq_len]
if control_sequence is not None:
control_depth = control_sequence.shape[-1]
control_sequence = tf.to_float(control_sequence)
control_sequence = control_sequence[:, :max_seq_len]
# Shouldn't be necessary, but the slice loses shape information when
# control depth is zero.
control_sequence.set_shape([batch_size, None, control_depth])
# The target/expected outputs.
x_target = output_sequence[:, :max_seq_len]
# Inputs to be fed to decoder, including zero padding for the initial input.
x_input = tf.pad(output_sequence[:, :max_seq_len - 1],
[(0, 0), (1, 0), (0, 0)])
x_length = tf.minimum(sequence_length, max_seq_len)
# Either encode to get `z`, or do unconditional, decoder-only.
if hparams.z_size: # vae mode:
q_z = self.encode(input_sequence, x_length, control_sequence)
z = q_z.sample()
# Prior distribution.
p_z = ds.MultivariateNormalDiag(
loc=[0.] * hparams.z_size, scale_diag=[1.] * hparams.z_size)
# KL Divergence (nats)
kl_div = ds.kl_divergence(q_z, p_z)
# Concatenate the Z vectors to the inputs at each time step.
else: # unconditional, decoder-only generation
kl_div = tf.zeros([batch_size, 1], dtype=tf.float32)
z = None
r_loss, metric_map = self.decoder.reconstruction_loss(
x_input, x_target, x_length, z, control_sequence)[0:2]
free_nats = hparams.free_bits * tf.math.log(2.0)
kl_cost = tf.maximum(kl_div - free_nats, 0)
beta = ((1.0 - tf.pow(hparams.beta_rate, tf.to_float(self.global_step)))
* hparams.max_beta)
self.loss = tf.reduce_mean(r_loss) + beta * tf.reduce_mean(kl_cost)
scalars_to_summarize = {
'loss': self.loss,
'losses/r_loss': r_loss,
'losses/kl_loss': kl_cost,
'losses/kl_bits': kl_div / tf.math.log(2.0),
'losses/kl_beta': beta,
}
return metric_map, scalars_to_summarize
def tensors_to_item(self, keys_to_tensors):
unmapped_tensor = super(_ClassTensorHandler,
self).tensors_to_item(keys_to_tensors)
return tf.maximum(self._name_to_id_table.lookup(unmapped_tensor),
self._display_name_to_id_table.lookup(unmapped_tensor))
def lrelu(input_, leak=0.2, name="lrelu"): return tf.maximum(input_, leak * input_, name=name)
def _get_final_index(sequence_length, time_major=True):
indices = [tf.maximum(0, sequence_length - 1),
tf.range(sequence_length.shape[0])]
if not time_major:
indices = indices[-1::-1]
return tf.stack(indices, axis=1)
def compute_mask_prob_from_yao_schedule(i, n, pmin=0.1, pmax=0.9, alpha=0.7):
wat = (pmax - pmin) * i / n
return tf.maximum(pmin, pmax - wat / alpha)
def _legacy_sqrt_decay(step): """Decay like 1 / sqrt(step), multiplied by 500 to normalize.""" return 500.0 / tf.sqrt(tf.maximum(step, 1.0))
def _resource_apply_dense(self, grad, handle):
var = handle
grad = tf.to_float(grad)
grad_squared = tf.square(grad) + self._epsilon1
grad_squared_mean = tf.reduce_mean(grad_squared)
decay_rate = self._decay_rate
update_scale = self._learning_rate
old_val = var
if var.dtype.base_dtype == tf.bfloat16:
old_val = tf.to_float(self._parameter_encoding.decode(old_val))
if self._multiply_by_parameter_scale:
update_scale *= tf.to_float(self._parameter_scale(old_val))
# HACK: Make things dependent on grad.
# This confounds the XLA rewriter and keeps it from fusing computations
# across different variables. This fusion is a bad for HBM usage, since
# it causes the gradients to persist in memory.
decay_rate += grad_squared_mean * 1e-30
update_scale += grad_squared_mean * 1e-30
# END HACK
mixing_rate = 1.0 - decay_rate
shape = var.get_shape().as_list()
updates = []
if self._should_use_factored_second_moment_estimate(shape):
grad_squared_row_mean = tf.reduce_mean(grad_squared, -1)
grad_squared_col_mean = tf.reduce_mean(grad_squared, -2)
vr = self.get_slot(var, "vr")
new_vr = (decay_rate * vr + mixing_rate * grad_squared_row_mean)
vc = self.get_slot(var, "vc")
new_vc = (decay_rate * vc + mixing_rate * grad_squared_col_mean)
vr_update = tf.assign(vr, new_vr, use_locking=self._use_locking)
vc_update = tf.assign(vc, new_vc, use_locking=self._use_locking)
updates = [vr_update, vc_update]
long_term_mean = tf.reduce_mean(new_vr, -1, keepdims=True)
r_factor = tf.rsqrt(new_vr / long_term_mean)
c_factor = tf.rsqrt(new_vc)
x = grad * tf.expand_dims(r_factor, -1) * tf.expand_dims(
c_factor, -2)
else:
v = self.get_slot(var, "v")
new_v = decay_rate * v + mixing_rate * grad_squared
v_update = tf.assign(v, new_v, use_locking=self._use_locking)
updates = [v_update]
x = grad * tf.rsqrt(new_v)
if self._clipping_threshold is not None:
clipping_denom = tf.maximum(
1.0,
reduce_rms(x) / self._clipping_threshold)
x /= clipping_denom
subtrahend = update_scale * x
if self._beta1:
m = self.get_slot(var, "m")
new_m = self._beta1 * tf.to_float(m) + (1.0 -
self._beta1) * subtrahend
subtrahend = new_m
new_m = common_layers.cast_like(new_m, var)
updates.append(tf.assign(m, new_m, use_locking=self._use_locking))
new_val = tf.to_float(old_val) - subtrahend
if var.dtype.base_dtype == tf.bfloat16:
new_val = self._parameter_encoding.encode(new_val,
self._quantization_noise)
if self._simulated_quantize_bits:
new_val = quantization.simulated_quantize(
var - subtrahend, self._simulated_quantize_bits,
self._quantization_noise)
var_update = tf.assign(var, new_val, use_locking=self._use_locking)
updates = [var_update] + updates
return tf.group(*updates)
def __init__(self,
sess,
model,
batch_size=1,
confidence=CONFIDENCE,
targeted=TARGETED,
learning_rate=LEARNING_RATE,
binary_search_steps=BINARY_SEARCH_STEPS,
max_iterations=MAX_ITERATIONS,
print_every=100,
early_stop_iters=0,
abort_early=ABORT_EARLY,
initial_const=INITIAL_CONST,
use_log=False,
use_tanh=True,
use_resize=False,
adam_beta1=0.9,
adam_beta2=0.999,
reset_adam_after_found=False,
solver="adam",
save_ckpts="",
load_checkpoint="",
start_iter=0,
init_size=32,
use_importance=True):
"""
The L_2 optimized attack.
This attack is the most efficient and should be used as the primary
attack to evaluate potential defenses.
Returns adversarial examples for the supplied model.
confidence: Confidence of adversarial examples: higher produces examples
that are farther away, but more strongly classified as adversarial.
batch_size: Number of gradient evaluations to run simultaneously.
targeted: True if we should perform a targetted attack, False otherwise.
learning_rate: The learning rate for the attack algorithm. Smaller values
produce better results but are slower to converge.
binary_search_steps: The number of times we perform binary search to
find the optimal tradeoff-constant between distance and confidence.
max_iterations: The maximum number of iterations. Larger values are more
accurate; setting too small will require a large learning rate and will
produce poor results.
abort_early: If true, allows early aborts if gradient descent gets stuck.
initial_const: The initial tradeoff-constant to use to tune the relative
importance of distance and confidence. If binary_search_steps is large,
the initial constant is not important.
"""
image_size, num_channels, num_labels = model.image_size, model.num_channels, model.num_labels
self.model = model
self.sess = sess
self.TARGETED = targeted
self.LEARNING_RATE = learning_rate
self.MAX_ITERATIONS = max_iterations
self.print_every = print_every
self.early_stop_iters = early_stop_iters if early_stop_iters != 0 else max_iterations // 10
print("early stop:", self.early_stop_iters)
self.BINARY_SEARCH_STEPS = binary_search_steps
self.ABORT_EARLY = abort_early
self.CONFIDENCE = confidence
self.initial_const = initial_const
self.start_iter = start_iter
self.batch_size = batch_size
self.num_channels = num_channels
self.resize_init_size = init_size
self.use_importance = use_importance
if use_resize:
self.small_x = self.resize_init_size
self.small_y = self.resize_init_size
else:
self.small_x = image_size
self.small_y = image_size
self.use_tanh = use_tanh
self.use_resize = use_resize
self.save_ckpts = save_ckpts
if save_ckpts:
os.system("mkdir -p {}".format(save_ckpts))
self.repeat = binary_search_steps >= 10
# each batch has a different modifier value (see below) to evaluate
# small_shape = (None,self.small_x,self.small_y,num_channels)
shape = (None, image_size, image_size, num_channels)
single_shape = (image_size, image_size, num_channels)
small_single_shape = (self.small_x, self.small_y, num_channels)
# the variable we're going to optimize over
# support multiple batches
# support any size image, will be resized to model native size
if self.use_resize:
self.modifier = tf.placeholder(tf.float32,
shape=(None, None, None, None))
# scaled up image
self.scaled_modifier = tf.image.resize_images(
self.modifier, [image_size, image_size])
# operator used for resizing image
self.resize_size_x = tf.placeholder(tf.int32)
self.resize_size_y = tf.placeholder(tf.int32)
self.resize_input = tf.placeholder(tf.float32,
shape=(1, None, None, None))
self.resize_op = tf.image.resize_images(
self.resize_input, [self.resize_size_x, self.resize_size_y])
else:
self.modifier = tf.placeholder(tf.float32,
shape=(None, image_size, image_size,
num_channels))
# no resize
self.scaled_modifier = self.modifier
# the real variable, initialized to 0
self.load_checkpoint = load_checkpoint
if load_checkpoint:
# if checkpoint is incorrect reshape will fail
print("Using checkpint", load_checkpoint)
self.real_modifier = np.load(load_checkpoint).reshape(
(1, ) + small_single_shape)
else:
self.real_modifier = np.zeros((1, ) + small_single_shape,
dtype=np.float32)
# self.real_modifier = np.random.randn(image_size * image_size * num_channels).astype(np.float32).reshape((1,) + single_shape)
# self.real_modifier /= np.linalg.norm(self.real_modifier)
# these are variables to be more efficient in sending data to tf
# we only work on 1 image at once; the batch is for evaluation loss at different modifiers
self.timg = tf.Variable(np.zeros(single_shape), dtype=tf.float32)
self.tlab = tf.Variable(np.zeros(num_labels), dtype=tf.float32)
self.const = tf.Variable(0.0, dtype=tf.float32)
# and here's what we use to assign them
self.assign_timg = tf.placeholder(tf.float32, single_shape)
self.assign_tlab = tf.placeholder(tf.float32, num_labels)
self.assign_const = tf.placeholder(tf.float32)
# the resulting image, tanh'd to keep bounded from -0.5 to 0.5
# broadcast self.timg to every dimension of modifier
if use_tanh:
self.newimg = tf.tanh(self.scaled_modifier + self.timg) / 2
else:
self.newimg = self.scaled_modifier + self.timg
# prediction BEFORE-SOFTMAX of the model
# now we have output at #batch_size different modifiers
# the output should have shape (batch_size, num_labels)
self.output = model.predict(self.newimg)
# distance to the input data
if use_tanh:
self.l2dist = tf.reduce_sum(
tf.square(self.newimg - tf.tanh(self.timg) / 2), [1, 2, 3])
else:
self.l2dist = tf.reduce_sum(tf.square(self.newimg - self.timg),
[1, 2, 3])
# compute the probability of the label class versus the maximum other
# self.tlab * self.output selects the Z value of real class
# because self.tlab is an one-hot vector
# the reduce_sum removes extra zeros, now get a vector of size #batch_size
self.real = tf.reduce_sum((self.tlab) * self.output, 1)
# (1-self.tlab)*self.output gets all Z values for other classes
# Because soft Z values are negative, it is possible that all Z values are less than 0
# and we mistakenly select the real class as the max. So we minus 10000 for real class
self.other = tf.reduce_max(
(1 - self.tlab) * self.output - (self.tlab * 10000), 1)
# If self.targeted is true, then the targets represents the target labels.
# If self.targeted is false, then targets are the original class labels.
if self.TARGETED:
if use_log:
# loss1 = - tf.log(self.real)
loss1 = tf.maximum(
0.0,
tf.log(self.other + 1e-30) - tf.log(self.real + 1e-30))
else:
# if targetted, optimize for making the other class (real) most likely
loss1 = tf.maximum(0.0,
self.other - self.real + self.CONFIDENCE)
else:
if use_log:
# loss1 = tf.log(self.real)
loss1 = tf.maximum(
0.0,
tf.log(self.real + 1e-30) - tf.log(self.other + 1e-30))
else:
# if untargeted, optimize for making this class least likely.
loss1 = tf.maximum(0.0,
self.real - self.other + self.CONFIDENCE)
# sum up the losses (output is a vector of #batch_size)
self.loss2 = self.l2dist
self.loss1 = self.const * loss1
self.loss = self.loss1 + self.loss2
# these are the variables to initialize when we run
self.setup = []
self.setup.append(self.timg.assign(self.assign_timg))
self.setup.append(self.tlab.assign(self.assign_tlab))
self.setup.append(self.const.assign(self.assign_const))
# prepare the list of all valid variables
var_size = self.small_x * self.small_y * num_channels
self.use_var_len = var_size
self.var_list = np.array(range(0, self.use_var_len), dtype=np.int32)
self.used_var_list = np.zeros(var_size, dtype=np.int32)
self.sample_prob = np.ones(var_size, dtype=np.float32) / var_size
# upper and lower bounds for the modifier
self.modifier_up = np.zeros(var_size, dtype=np.float32)
self.modifier_down = np.zeros(var_size, dtype=np.float32)
# random permutation for coordinate update
self.perm = np.random.permutation(var_size)
self.perm_index = 0
# ADAM status
self.mt = np.zeros(var_size, dtype=np.float32)
self.vt = np.zeros(var_size, dtype=np.float32)
# self.beta1 = 0.8
# self.beta2 = 0.99
self.beta1 = adam_beta1
self.beta2 = adam_beta2
self.reset_adam_after_found = reset_adam_after_found
self.adam_epoch = np.ones(var_size, dtype=np.int32)
self.stage = 0
# variables used during optimization process
self.grad = np.zeros(batch_size, dtype=np.float32)
self.hess = np.zeros(batch_size, dtype=np.float32)
# for testing
self.grad_op = tf.gradients(self.loss, self.modifier)
# compile numba function
# self.coordinate_ADAM_numba = jit(coordinate_ADAM, nopython = True)
# self.coordinate_ADAM_numba.recompile()
# print(self.coordinate_ADAM_numba.inspect_llvm())
# np.set_printoptions(threshold=np.nan)
# set solver
solver = solver.lower()
self.solver_name = solver
if solver == "adam":
self.solver = coordinate_ADAM
elif solver == "newton":
self.solver = coordinate_Newton
elif solver == "adam_newton":
self.solver = coordinate_Newton_ADAM
elif solver != "fake_zero":
print("unknown solver", solver)
self.solver = coordinate_ADAM
print("Using", solver, "solver")
def get_stage_1(dof_feat, simmat_feat, is_training, bn_decay=None):
batch_size = dof_feat.get_shape()[0].value
#task1: key_point
feat1 = tf_util.conv1d(dof_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task1/fc1',
bn_decay=bn_decay)
pred_labels_key_p = tf_util.conv1d(feat1,
2,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task1/fc2',
bn_decay=bn_decay)
#task2_1: labels_direction
feat2_1 = tf_util.conv1d(dof_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task2_1/fc1',
bn_decay=bn_decay)
pred_labels_direction = tf_util.conv1d(feat2_1,
15,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task2_1/fc2',
bn_decay=bn_decay)
#task2_2: regression_direction
feat2_2 = tf_util.conv1d(dof_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task2_2/fc1',
bn_decay=bn_decay)
pred_regression_direction = tf_util.conv1d(feat2_2,
3,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task2_2/fc2',
bn_decay=bn_decay)
#task_3: position
feat3 = tf_util.conv1d(dof_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task3/fc1',
bn_decay=bn_decay)
pred_regression_position = tf_util.conv1d(feat3,
3,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task3/fc2',
bn_decay=bn_decay)
#task_4: dof_type
feat4 = tf_util.conv1d(dof_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task4/fc1',
bn_decay=bn_decay)
pred_labels_type = tf_util.conv1d(feat4,
4,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task4/fc2',
bn_decay=bn_decay)
#task_5: similar matrix
feat5 = tf_util.conv1d(simmat_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task_5/fc1',
bn_decay=bn_decay)
r = tf.reduce_sum(feat5 * feat5, 2)
r = tf.reshape(r, [batch_size, -1, 1])
D = r - 2 * tf.matmul(feat5, tf.transpose(
feat5, perm=[0, 2, 1])) + tf.transpose(r, perm=[0, 2, 1])
pred_simmat = tf.maximum(10 * D, 0.)
#task_6: confidence map
feat6 = tf_util.conv1d(simmat_feat,
128,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task6/fc1',
bn_decay=bn_decay)
conf_logits = tf_util.conv1d(feat6,
1,
1,
padding='VALID',
activation_fn=None,
scope='stage1/task_6/fc2',
bn_decay=bn_decay)
pred_conf_logits = tf.nn.sigmoid(conf_logits,
name='stage1/task_6/confidence')
return pred_labels_key_p,pred_labels_direction,pred_regression_direction,pred_regression_position, \
pred_labels_type,pred_simmat,pred_conf_logits
def train_rgvn(self, perf_metric):
"""Trains DVRL based on the specified objective function.
Args:
perf_metric: 'auc', 'accuracy', 'log-loss' for classification
'mae', 'mse', 'rmspe' for regression
"""
# Generates selected probability
est_data_value = self.rpm()
# Generator loss (REINFORCE algorithm)
prob = tf.reduce_sum(
self.s_input * tf.log(est_data_value + self.epsilon) +
(1 - self.s_input) * tf.log(1 - est_data_value + self.epsilon))
dve_loss = (-self.reward_input * prob) + \
1e3 * (tf.maximum(tf.reduce_mean(est_data_value)
- self.threshold, 0) +
tf.maximum((1 - self.threshold) -
tf.reduce_mean(est_data_value), 0))
# Variable
dve_vars = [
v for v in tf.trainable_variables()
if v.name.startswith('data_value_estimator')
]
# Solver
dve_solver = tf.train.AdamOptimizer(self.learning_rate).minimize(
dve_loss, var_list=dve_vars)
LogUtil.log('INFO', "To evaluate x_valid with ori model!")
# Baseline performance
print(self.ori_model_path)
y_valid_hat = eval_sgcn_prediction(self.x_valid, window=4, model_path=self.ori_model_path, \
gpu_id=0, y_test=self.y_valid, predict_batch_size=self.batch_size_predictor)
if perf_metric == 'auc':
# valid_perf = metrics.roc_auc_score(self.y_valid, y_valid_hat[:, 1])
valid_perf = metrics.roc_auc_score(self.y_valid_onehot,
y_valid_hat)
elif perf_metric == 'accuracy':
valid_perf = metrics.accuracy_score(self.y_valid,
np.argmax(y_valid_hat, axis=1))
elif perf_metric == 'log_loss':
valid_perf = -metrics.log_loss(self.y_valid, y_valid_hat)
elif perf_metric == 'rmspe':
valid_perf = rgvn_metrics.rmspe(self.y_valid, y_valid_hat)
elif perf_metric == 'mae':
valid_perf = metrics.mean_absolute_error(self.y_valid, y_valid_hat)
elif perf_metric == 'mse':
valid_perf = metrics.mean_squared_error(self.y_valid, y_valid_hat)
LogUtil.log('INFO', "To evaluate x_train with val model!")
# Prediction differences
y_train_valid_pred = eval_sgcn_prediction(
self.x_train,
window=4,
model_path=self.val_model_path,
gpu_id=0,
y_test=self.y_train,
predict_batch_size=self.batch_size_predictor)
if self.problem == 'classification':
y_pred_diff = np.abs(self.y_train_onehot - y_train_valid_pred)
elif self.problem == 'regression':
y_pred_diff = \
np.abs(self.y_train_onehot - y_train_valid_pred) / \
self.y_train_onehot
#Disable GPU Usage
# os.environ["CUDA_VISIBLE_DEVICES"] = "-1"
# Main session
session_conf = tf.ConfigProto(allow_soft_placement=False,
log_device_placement=False)
sess = tf.Session(config=session_conf)
sess.run(tf.global_variables_initializer())
# Model save at the end
saver = tf.train.Saver(dve_vars)
for _ in tqdm.tqdm(range(self.outer_iterations)):
# Batch selection
batch_idx = \
np.random.permutation(len(self.x_train))[
:self.batch_size]
x_batch = self.x_train[batch_idx]
y_batch_onehot = self.y_train_onehot[batch_idx]
y_batch = self.y_train[batch_idx]
y_hat_batch = y_pred_diff[batch_idx]
LogUtil.log('INFO', 'hhhhhhhhhhhhhhhhhhhh')
x_train_class = SGCNData(self.x_train, self.y_train, 4)
alias_inputs, A, items, node_masks, targets = x_train_class.get_slice(
batch_idx)
LogUtil.log('INFO', 'Start to generate selection probability')
# Generates selection probability
print(x_batch)
print(items)
print(A)
print(y_input)
est_dv_curr = sess.run(
est_data_value,
feed_dict={
self.A: A,
# Liu Chenxu add
#self.x_input: x_batch,
self.items: items,
self.node_masks: node_masks,
self.y_input: y_batch_onehot,
self.y_hat_input: y_hat_batch
})
LogUtil.log('INFO', 'End to generate selection probability')
# Samples the selection probability
sel_prob_curr = np.random.binomial(1, est_dv_curr,
est_dv_curr.shape)
# Exception (When selection probability is 0)
if np.sum(sel_prob_curr) == 0:
est_dv_curr = 0.5 * np.ones(np.shape(est_dv_curr))
sel_prob_curr = np.random.binomial(1, est_dv_curr,
est_dv_curr.shape)
# Trains predictor
flatten_sel_prob_curr = sel_prob_curr.flatten()
weighted_x_batch = x_batch[np.where(flatten_sel_prob_curr > 0)]
weighted_y_batch = y_batch[np.where(flatten_sel_prob_curr > 0)]
LogUtil.log('INFO', "Start to train new model.")
# new_model_batch_size = len(weighted_x_batch)
new_model_path = train_sgcn(self.hidden_dim, self.label_dim, self.n_nodes, 1, weighted_x_batch,
weighted_y_batch, 50, \
'tmp/sgcn_as_predict_new_model', step_save_model=8, lr=0.001,
epoch=self.inner_iterations)
LogUtil.log('INFO', "New model training done.")
LogUtil.log('INFO', new_model_path)
# Prediction
y_valid_hat = eval_sgcn_prediction(self.x_valid, window=4, model_path=new_model_path, \
gpu_id=0, y_test=self.y_valid,
predict_batch_size=self.batch_size_predictor)
LogUtil.log('INFO', "Evaluate with new model done.")
# Reward computation
if perf_metric == 'auc':
rgvn_perf = metrics.roc_auc_score(
# self.y_valid, y_valid_hat[:, 1])
self.y_valid_onehot,
y_valid_hat)
elif perf_metric == 'accuracy':
rgvn_perf = metrics.accuracy_score(
self.y_valid, np.argmax(y_valid_hat, axis=1))
elif perf_metric == 'log_loss':
rgvn_perf = -metrics.log_loss(self.y_valid, y_valid_hat)
elif perf_metric == 'rmspe':
rgvn_perf = rgvn_metrics.rmspe(self.y_valid, y_valid_hat)
elif perf_metric == 'mae':
rgvn_perf = metrics.mean_absolute_error(
self.y_valid, y_valid_hat)
elif perf_metric == 'mse':
rgvn_perf = metrics.mean_squared_error(self.y_valid,
y_valid_hat)
if self.problem == 'classification':
reward_curr = rgvn_perf - valid_perf
elif self.problem == 'regression':
reward_curr = valid_perf - rgvn_perf
LogUtil.log('INFO', 'Start to train the generator')
# Trains the generator
_, _ = sess.run(
[dve_solver, dve_loss],
feed_dict={
self.A: A,
self.items: items,
self.node_masks: node_masks,
self.y_input: y_batch_onehot,
self.y_hat_input: y_hat_batch,
self.s_input: sel_prob_curr,
self.reward_input: reward_curr
})
LogUtil.log('INFO', 'End to train the generator')
# Saves trained model
saver.save(sess, self.checkpoint_file_name)
LogUtil.log('INFO', "Saved trained rgvn model.")
def get_stage_1_loss(pred_labels_key_p,pred_labels_direction,pred_regression_direction,pred_regression_position, \
pred_labels_type,labels_key_p,labels_direction,regression_direction,regression_position,labels_type,\
simmat_pl,neg_simmat_pl,pred_simmat,pred_conf_logits):
batch_size = pred_labels_key_p.get_shape()[0].value
num_point = pred_labels_key_p.get_shape()[1].value
mask = tf.cast(labels_key_p, tf.float32)
neg_mask = tf.ones_like(mask) - mask
Np = tf.expand_dims(tf.reduce_sum(mask, axis=1), 1)
Ng = tf.expand_dims(tf.reduce_sum(neg_mask, axis=1), 1)
all_mask = tf.ones_like(mask)
#loss:task1
task_1_loss = tf.reduce_mean(
tf.nn.sparse_softmax_cross_entropy_with_logits(
logits=pred_labels_key_p, labels=labels_key_p) * (mask *
(Ng / Np) + 1))
task_1_recall = tf.reduce_mean(tf.reduce_sum(tf.cast(tf.equal(tf.argmax(pred_labels_key_p,axis=2,output_type = tf.int32),\
labels_key_p),tf.float32)*mask,axis = 1)/tf.reduce_sum(mask,axis=1))
task_1_acc = tf.reduce_mean(tf.reduce_sum(tf.cast(tf.equal(tf.argmax(pred_labels_key_p,axis=2,output_type = tf.int32),\
labels_key_p),tf.float32),axis = 1)/num_point)
#loss:task2_1
task_2_1_loss = tf.reduce_mean(tf.reduce_sum(tf.nn.sparse_softmax_cross_entropy_with_logits(logits = pred_labels_direction,\
labels = labels_direction)*mask,axis = 1)/tf.reduce_sum(mask,axis=1))
task_2_1_acc = tf.reduce_mean(tf.reduce_sum(tf.cast(tf.equal(tf.argmax(pred_labels_direction,axis=2,output_type=tf.int32), \
labels_direction),tf.float32)*mask,axis=1)/tf.reduce_sum(mask,axis=1))
#loss:task2_2
task_2_2_loss = tf.reduce_mean(tf.reduce_sum(tf.reduce_mean(smooth_l1_dist(pred_regression_direction-regression_direction),axis=2)*mask, \
axis = 1)/tf.reduce_sum(mask,axis=1))
#loss:task3
task_3_loss = tf.reduce_mean(tf.reduce_sum(tf.reduce_mean(smooth_l1_dist(pred_regression_position-regression_position),axis=2)*mask, \
axis = 1)/tf.reduce_sum(mask,axis=1))
#loss:task4
task_4_loss = tf.reduce_mean(
tf.reduce_sum(tf.nn.sparse_softmax_cross_entropy_with_logits(
logits=pred_labels_type, labels=labels_type) * mask,
axis=1) / tf.reduce_sum(mask, axis=1))
task_4_acc = tf.reduce_mean(tf.reduce_sum(tf.cast(tf.equal(tf.argmax(pred_labels_type,axis=2,output_type = tf.int32),\
labels_type),tf.float32)*mask,axis = 1)/tf.reduce_sum(mask,axis=1))
#loss: task_5
pos = pred_simmat * simmat_pl
neg = tf.maximum(80 - pred_simmat, 0) * neg_simmat_pl
task_5_loss = tf.reduce_mean(pos + neg)
#loss: task_6
ng_label = tf.greater(simmat_pl, 0.5)
ng = tf.less(pred_simmat, 80)
epsilon = tf.constant(
np.ones(ng_label.get_shape()[:2]).astype(np.float32) * 1e-6)
pts_iou = tf.reduce_sum(tf.cast(tf.logical_and(ng, ng_label), tf.float32), axis=2) / \
(tf.reduce_sum(tf.cast(tf.logical_or(ng, ng_label), tf.float32), axis=2) + epsilon)
task_6_loss = tf.reduce_mean(
tf.squared_difference(pts_iou, tf.squeeze(pred_conf_logits, [2])))
w1 = 1
w2_1 = 1
w2_2 = 100
w3 = 100
w4 = 1
w5 = 1
w6 = 100
loss = task_1_loss * w1 + task_2_1_loss * w2_1 + task_2_2_loss * w2_2 + task_3_loss * w3 + task_4_loss * w4 + task_5_loss * w5 + task_6_loss * w6
tf.summary.scalar('all loss', loss)
tf.add_to_collection('losses', loss)
return task_1_loss, task_1_recall, task_1_acc, task_2_1_loss, task_2_1_acc, task_2_2_loss, task_3_loss, task_4_loss, task_4_acc, task_5_loss, task_6_loss, loss
def loss_fn(features, mode, params):
"""Computes the training loss for depth and egomotion training.
This function is written with TPU-friendlines in mind.
Args:
features: A dictionary mapping strings to tuples of (tf.Tensor, tf.Tensor),
representing pairs of frames. The loss will be calculated from these
tensors. The expected endpoints are 'rgb', 'depth', 'intrinsics_mat'
and 'intrinsics_mat_inv'.
mode: One of tf.estimator.ModeKeys: TRAIN, PREDICT or EVAL.
params: A dictionary with hyperparameters that optionally override
DEFAULT_PARAMS above.
Returns:
A dictionary mapping each loss name (see DEFAULT_PARAMS['loss_weights']'s
keys) to a scalar tf.Tensor representing the respective loss. The total
training loss.
Raises:
ValueError: `features` endpoints that don't conform with their expected
structure.
"""
params = parameter_container.ParameterContainer.from_defaults_and_overrides(
DEFAULT_PARAMS, params, is_strict=True, strictness_depth=2)
if len(features['rgb']) != 2 or 'depth' in features and len(
features['depth']) != 2:
raise ValueError(
'RGB and depth endpoints are expected to be a tuple of two'
' tensors. Rather, they are %s.' % str(features))
# On tpu we strive to stack tensors together and perform ops once on the
# entire stack, to save time HBM memory. We thus stack the batch-of-first-
# frames and the batch-of-second frames, for both depth and RGB. The batch
# dimension of rgb_stack and gt_depth_stack are thus twice the original batch
# size.
rgb_stack = tf.concat(features['rgb'], axis=0)
depth_predictor = depth_prediction_nets.ResNet18DepthPredictor(
mode, params.depth_predictor_params.as_dict())
predicted_depth = depth_predictor.predict_depth(rgb_stack)
maybe_summary.histogram('PredictedDepth', predicted_depth)
endpoints = {}
endpoints['predicted_depth'] = tf.split(predicted_depth, 2, axis=0)
endpoints['rgb'] = features['rgb']
# We make the heuristic that depths that are less than 0.2 meters are not
# accurate. This is a rough placeholder for a confidence map that we're going
# to have in future.
if 'depth' in features:
endpoints['groundtruth_depth'] = features['depth']
if params.cascade:
motion_features = [
tf.concat([features['rgb'][0], endpoints['predicted_depth'][0]],
axis=-1),
tf.concat([features['rgb'][1], endpoints['predicted_depth'][1]],
axis=-1)
]
else:
motion_features = features['rgb']
motion_features_stack = tf.concat(motion_features, axis=0)
flipped_motion_features_stack = tf.concat(motion_features[::-1], axis=0)
# Unlike `rgb_stack`, here we stacked the frames in reverse order along the
# Batch dimension. By concatenating the two stacks below along the channel
# axis, we create the following tensor:
#
# Channel dimension (3)
# _ _
# | Frame1-s batch | Frame2-s batch |____Batch
# |_ Frame2-s batch | Frame1-s batch _| dimension (0)
#
# When we send this tensor to the motion prediction network, the first and
# second halves of the result represent the camera motion from Frame1 to
# Frame2 and from Frame2 to Frame1 respectively. Further below we impose a
# loss that drives these two to be the inverses of one another
# (cycle-consistency).
pairs = tf.concat([motion_features_stack, flipped_motion_features_stack],
axis=-1)
rot, trans, residual_translation, intrinsics_mat = (
object_motion_nets.motion_field_net(
images=pairs,
weight_reg=params.motion_prediction_params.weight_reg,
align_corners=params.motion_prediction_params.align_corners,
auto_mask=params.motion_prediction_params.auto_mask))
if params.motion_field_burnin_steps > 0.0:
step = tf.to_float(tf.train.get_or_create_global_step())
burnin_steps = tf.to_float(params.motion_field_burnin_steps)
residual_translation *= tf.clip_by_value(2 * step / burnin_steps - 1,
0.0, 1.0)
# If using grouth truth egomotion
if not params.learn_egomotion:
egomotion_mat = tf.concat(features['egomotion_mat'], axis=0)
rot = transform_utils.angles_from_matrix(egomotion_mat[:, :3, :3])
trans = egomotion_mat[:, :3, 3]
trans = tf.expand_dims(trans, 1)
trans = tf.expand_dims(trans, 1)
if params.use_mask:
mask = tf.to_float(tf.concat(features['mask'], axis=0) > 0)
if params.foreground_dilation > 0:
pool_size = params.foreground_dilation * 2 + 1
mask = tf.nn.max_pool(mask, [1, pool_size, pool_size, 1], [1] * 4,
'SAME')
residual_translation *= mask
maybe_summary.histogram('ResidualTranslation', residual_translation)
maybe_summary.histogram('BackgroundTranslation', trans)
maybe_summary.histogram('Rotation', rot)
endpoints['residual_translation'] = tf.split(residual_translation,
2,
axis=0)
endpoints['background_translation'] = tf.split(trans, 2, axis=0)
endpoints['rotation'] = tf.split(rot, 2, axis=0)
if not params.learn_intrinsics.enabled:
endpoints['intrinsics_mat'] = features['intrinsics_mat']
endpoints['intrinsics_mat_inv'] = features['intrinsics_mat_inv']
elif params.learn_intrinsics.per_video:
int_mat = intrinsics_utils.create_and_fetch_intrinsics_per_video_index(
features['video_index'][0],
params.image_preprocessing.image_height,
params.image_preprocessing.image_width,
max_video_index=params.learn_intrinsics.max_number_of_videos)
endpoints['intrinsics_mat'] = tf.concat([int_mat] * 2, axis=0)
endpoints[
'intrinsics_mat_inv'] = intrinsics_utils.invert_intrinsics_matrix(
int_mat)
else:
# The intrinsic matrix should be the same, no matter the order of
# images (mat = inv_mat). It's probably a good idea to enforce this
# by a loss, but for now we just take their average as a prediction for the
# intrinsic matrix.
intrinsics_mat = 0.5 * sum(tf.split(intrinsics_mat, 2, axis=0))
endpoints['intrinsics_mat'] = [intrinsics_mat] * 2
endpoints['intrinsics_mat_inv'] = [
intrinsics_utils.invert_intrinsics_matrix(intrinsics_mat)
] * 2
aggregator = loss_aggregator.DepthMotionFieldLossAggregator(
endpoints, params.loss_weights.as_dict(), params.loss_params.as_dict())
# Add some more summaries.
maybe_summary.image('rgb0', features['rgb'][0])
maybe_summary.image('rgb1', features['rgb'][1])
disp0, disp1 = tf.split(aggregator.output_endpoints['disparity'],
2,
axis=0)
maybe_summary.image('disparity0/grayscale', disp0)
maybe_summary.image_with_colormap('disparity0/plasma',
tf.squeeze(disp0, axis=3), 'plasma', 0.0)
maybe_summary.image('disparity1/grayscale', disp1)
maybe_summary.image_with_colormap('disparity1/plasma',
tf.squeeze(disp1, axis=3), 'plasma', 0.0)
if maybe_summary.summaries_enabled():
if 'depth' in features:
gt_disp0 = 1.0 / tf.maximum(features['depth'][0], 0.5)
gt_disp1 = 1.0 / tf.maximum(features['depth'][1], 0.5)
maybe_summary.image('disparity_gt0', gt_disp0)
maybe_summary.image('disparity_gt1', gt_disp1)
depth_proximity_weight0, depth_proximity_weight1 = tf.split(
aggregator.output_endpoints['depth_proximity_weight'], 2, axis=0)
maybe_summary.image('consistency_weight0',
tf.expand_dims(depth_proximity_weight0, -1))
maybe_summary.image('consistency_weight1',
tf.expand_dims(depth_proximity_weight1, -1))
maybe_summary.image('trans', aggregator.output_endpoints['trans'])
maybe_summary.image('trans_inv',
aggregator.output_endpoints['inv_trans'])
maybe_summary.image('trans_res', endpoints['residual_translation'][0])
maybe_summary.image('trans_res_inv',
endpoints['residual_translation'][1])
return aggregator.losses
def resize_and_crop_image_v2(image,
short_side,
long_side,
padded_size,
aug_scale_min=1.0,
aug_scale_max=1.0,
seed=1,
method=tf.image.ResizeMethod.BILINEAR):
"""Resizes the input image to output size (Faster R-CNN style).
Resize and pad images given the specified short / long side length and the
stride size.
Here are the preprocessing steps.
1. For a given image, keep its aspect ratio and first try to rescale the short
side of the original image to `short_side`.
2. If the scaled image after 1 has a long side that exceeds `long_side`, keep
the aspect ratio and rescal the long side of the image to `long_side`.
2. Pad the rescaled image to the padded_size.
Args:
image: a `Tensor` of shape [height, width, 3] representing an image.
short_side: a scalar `Tensor` or `int` representing the desired short side
to be rescaled to.
long_side: a scalar `Tensor` or `int` representing the desired long side to
be rescaled to.
padded_size: a `Tensor` or `int` list/tuple of two elements representing
[height, width] of the padded output image size. Padding will be applied
after scaling the image to the desired_size.
aug_scale_min: a `float` with range between [0, 1.0] representing minimum
random scale applied to desired_size for training scale jittering.
aug_scale_max: a `float` with range between [1.0, inf] representing maximum
random scale applied to desired_size for training scale jittering.
seed: seed for random scale jittering.
method: function to resize input image to scaled image.
Returns:
output_image: `Tensor` of shape [height, width, 3] where [height, width]
equals to `output_size`.
image_info: a 2D `Tensor` that encodes the information of the image and the
applied preprocessing. It is in the format of
[[original_height, original_width], [desired_height, desired_width],
[y_scale, x_scale], [y_offset, x_offset]], where [desired_height,
desired_width] is the actual scaled image size, and [y_scale, x_scale] is
the scaling factor, which is the ratio of
scaled dimension / original dimension.
"""
with tf.name_scope('resize_and_crop_image_v2'):
image_size = tf.cast(tf.shape(image)[0:2], tf.float32)
scale_using_short_side = (short_side /
tf.minimum(image_size[0], image_size[1]))
scale_using_long_side = (long_side /
tf.maximum(image_size[0], image_size[1]))
scaled_size = tf.round(image_size * scale_using_short_side)
scaled_size = tf.where(
tf.greater(tf.maximum(scaled_size[0], scaled_size[1]), long_side),
tf.round(image_size * scale_using_long_side), scaled_size)
desired_size = scaled_size
random_jittering = (aug_scale_min != 1.0 or aug_scale_max != 1.0)
if random_jittering:
random_scale = tf.random_uniform([],
aug_scale_min,
aug_scale_max,
seed=seed)
scaled_size = tf.round(random_scale * scaled_size)
# Computes 2D image_scale.
image_scale = scaled_size / image_size
# Selects non-zero random offset (x, y) if scaled image is larger than
# desired_size.
if random_jittering:
max_offset = scaled_size - desired_size
max_offset = tf.where(tf.less(max_offset, 0),
tf.zeros_like(max_offset), max_offset)
offset = max_offset * tf.random_uniform([
2,
], 0, 1, seed=seed)
offset = tf.cast(offset, tf.int32)
else:
offset = tf.zeros((2, ), tf.int32)
scaled_image = tf.image.resize_images(image,
tf.cast(scaled_size, tf.int32),
method=method)
if random_jittering:
scaled_image = scaled_image[offset[0]:offset[0] + desired_size[0],
offset[1]:offset[1] +
desired_size[1], :]
output_image = tf.image.pad_to_bounding_box(scaled_image, 0, 0,
padded_size[0],
padded_size[1])
image_info = tf.stack([
image_size,
tf.cast(desired_size, dtype=tf.float32), image_scale,
tf.cast(offset, tf.float32)
])
return output_image, image_info
def aggregate_task_losses(hparams, problem_hparams, logits, feature_name,
feature):
"""Multiproblem loss function."""
# If no reweighting, we want the default loss to mimic the LM loss.
if not hparams.multiproblem_reweight_label_loss:
return aggregate_task_lm_losses(hparams=hparams,
problem_hparams=problem_hparams,
logits=logits,
feature_name=feature_name,
feature=feature)
summaries = []
main_task_id = hparams.problem.task_list[0].task_id
vocab_size = problem_hparams.vocab_size[feature_name]
if vocab_size is not None and hasattr(hparams, "vocab_divisor"):
vocab_size += (-vocab_size) % hparams.vocab_divisor
modality = problem_hparams.modality[feature_name]
loss = hparams.loss.get(feature_name, modalities.get_loss(modality))
weights_fn = hparams.weights_fn.get(feature_name,
modalities.get_weights_fn(modality))
# Primary task loss
loss_num, loss_den = loss(
logits, feature,
lambda x: common_layers.weights_multi_problem_all(x, main_task_id),
hparams, vocab_size, weights_fn)
loss_val = loss_num / tf.maximum(1.0, loss_den)
summaries.append([hparams.problem.task_list[0].name + "_loss", loss_val])
# Since the losses may undergo rescaling, they cannot exist as separate
# numerators and denominators. Set the denominators to 1 in order to faciliate
# loss averaging.
loss_num = loss_val
loss_den = tf.minimum(tf.convert_to_tensor(1, dtype=tf.float32), loss_den)
for task in hparams.problem.task_list[1:]:
# Loss only from the input sequence -- the auxiliary LM loss.
seq_loss_num, seq_loss_den = loss(
logits,
feature,
lambda x: common_layers.weights_multi_problem_input(
x, task.task_id), # pylint: disable=cell-var-from-loop
hparams,
vocab_size)
seq_loss_num *= problem_hparams.loss_multiplier
# Unscaled sequence loss.
seq_loss = seq_loss_num / tf.maximum(1.0, seq_loss_den)
summaries.append([task.name + "_seq_loss", seq_loss])
if hasattr(task, "num_classes"):
# Loss only from the classification label.
label_loss_num, label_loss_den = loss(
logits,
feature,
lambda x: common_layers.weights_multi_problem(x, task.task_id), # pylint: disable=cell-var-from-loop
hparams,
vocab_size)
label_loss_num *= problem_hparams.loss_multiplier
# Unscaled classification label loss.
label_loss = label_loss_num / tf.maximum(1.0, label_loss_den)
summaries.append([task.name + "_label_loss", label_loss])
# Scaling.
if hparams.multiproblem_reweight_label_loss:
label_loss *= hparams.multiproblem_label_weight
seq_loss *= (1 - hparams.multiproblem_label_weight)
# This is the training loss for the optimizer after scaling.
task_loss_val = seq_loss + label_loss
loss_den_ = label_loss_den
else:
# Loss only from the target sequence.
target_loss_num, target_loss_den = loss(
logits,
feature,
lambda x: common_layers.weights_multi_problem(x, task.task_id), # pylint: disable=cell-var-from-loop
hparams,
vocab_size)
target_loss_num *= problem_hparams.loss_multiplier
# Unscaled target sequence loss.
target_loss = target_loss_num / tf.maximum(1.0, target_loss_den)
summaries.append([task.name + "_target_loss", target_loss])
# Scaling.
if hparams.multiproblem_reweight_label_loss:
target_loss *= hparams.multiproblem_label_weight
seq_loss *= (1 - hparams.multiproblem_label_weight)
# This is the training loss for the optimizer after all the scaling.
task_loss_val = seq_loss + target_loss
loss_den_ = target_loss_den
summaries.append([task.name + "_loss", task_loss_val])
# Adding 1 to the loss den for each task leads to averaging task losses.
# TODO(urvashik): Fix combination with other task losses - weighted
# average based on the number of examples from that task.
loss_num += task_loss_val
loss_den += tf.minimum(tf.convert_to_tensor(1, dtype=tf.float32),
loss_den_)
return loss_num, loss_den, summaries
def multilevel_crop_and_resize(features, boxes, output_size=7):
"""Crop and resize on multilevel feature pyramid.
Generate the (output_size, output_size) set of pixels for each input box
by first locating the box into the correct feature level, and then cropping
and resizing it using the correspoding feature map of that level.
Args:
features: A dictionary with key as pyramid level and value as features. The
features are in shape of [batch_size, height_l, width_l, num_filters].
boxes: A 3-D Tensor of shape [batch_size, num_boxes, 4]. Each row represents
a box with [y1, x1, y2, x2] in un-normalized coordinates.
output_size: A scalar to indicate the output crop size.
Returns:
A 5-D tensor representing feature crop of shape
[batch_size, num_boxes, output_size, output_size, num_filters].
"""
with tf.name_scope('multilevel_crop_and_resize'):
levels = list(features.keys())
min_level = min(levels)
max_level = max(levels)
batch_size, max_feature_height, max_feature_width, num_filters = (
features[min_level].get_shape().as_list())
_, num_boxes, _ = boxes.get_shape().as_list()
# Stack feature pyramid into a features_all of shape
# [batch_size, levels, height, width, num_filters].
features_all = []
feature_heights = []
feature_widths = []
for level in range(min_level, max_level + 1):
shape = features[level].get_shape().as_list()
feature_heights.append(shape[1])
feature_widths.append(shape[2])
# Concat tensor of [batch_size, height_l * width_l, num_filters] for each
# levels.
features_all.append(
tf.reshape(features[level], [batch_size, -1, num_filters]))
features_r2 = tf.reshape(tf.concat(features_all, 1),
[-1, num_filters])
# Calculate height_l * width_l for each level.
level_dim_sizes = [
feature_widths[i] * feature_heights[i]
for i in range(len(feature_widths))
]
# level_dim_offsets is accumulated sum of level_dim_size.
level_dim_offsets = [0]
for i in range(len(feature_widths) - 1):
level_dim_offsets.append(level_dim_offsets[i] + level_dim_sizes[i])
batch_dim_size = level_dim_offsets[-1] + level_dim_sizes[-1]
level_dim_offsets = tf.constant(level_dim_offsets, tf.int32)
height_dim_sizes = tf.constant(feature_widths, tf.int32)
# Assigns boxes to the right level.
box_width = boxes[:, :, 3] - boxes[:, :, 1]
box_height = boxes[:, :, 2] - boxes[:, :, 0]
areas_sqrt = tf.sqrt(box_height * box_width)
levels = tf.cast(
tf.floordiv(tf.log(tf.div(areas_sqrt, 224.0)), tf.log(2.0)) + 4.0,
dtype=tf.int32)
# Maps levels between [min_level, max_level].
levels = tf.minimum(max_level, tf.maximum(levels, min_level))
# Projects box location and sizes to corresponding feature levels.
scale_to_level = tf.cast(tf.pow(tf.constant(2.0),
tf.cast(levels, tf.float32)),
dtype=boxes.dtype)
boxes /= tf.expand_dims(scale_to_level, axis=2)
box_width /= scale_to_level
box_height /= scale_to_level
boxes = tf.concat([
boxes[:, :, 0:2],
tf.expand_dims(box_height, -1),
tf.expand_dims(box_width, -1)
],
axis=-1)
# Maps levels to [0, max_level-min_level].
levels -= min_level
level_strides = tf.pow([[2.0]], tf.cast(levels, tf.float32))
boundary = tf.cast(
tf.concat([
tf.expand_dims([[tf.cast(max_feature_height, tf.float32)]] /
level_strides - 1,
axis=-1),
tf.expand_dims([[tf.cast(max_feature_width, tf.float32)]] /
level_strides - 1,
axis=-1),
],
axis=-1), boxes.dtype)
# Compute grid positions.
kernel_y, kernel_x, box_gridy0y1, box_gridx0x1 = compute_grid_positions(
boxes, boundary, output_size, sample_offset=0.5)
x_indices = tf.cast(tf.reshape(
box_gridx0x1, [batch_size, num_boxes, output_size * 2]),
dtype=tf.int32)
y_indices = tf.cast(tf.reshape(
box_gridy0y1, [batch_size, num_boxes, output_size * 2]),
dtype=tf.int32)
batch_size_offset = tf.tile(
tf.reshape(
tf.range(batch_size) * batch_dim_size, [batch_size, 1, 1, 1]),
[1, num_boxes, output_size * 2, output_size * 2])
# Get level offset for each box. Each box belongs to one level.
levels_offset = tf.tile(
tf.reshape(tf.gather(level_dim_offsets, levels),
[batch_size, num_boxes, 1, 1]),
[1, 1, output_size * 2, output_size * 2])
y_indices_offset = tf.tile(
tf.reshape(
y_indices *
tf.expand_dims(tf.gather(height_dim_sizes, levels), -1),
[batch_size, num_boxes, output_size * 2, 1]),
[1, 1, 1, output_size * 2])
x_indices_offset = tf.tile(
tf.reshape(x_indices, [batch_size, num_boxes, 1, output_size * 2]),
[1, 1, output_size * 2, 1])
indices = tf.reshape(
batch_size_offset + levels_offset + y_indices_offset +
x_indices_offset, [-1])
# TODO(wangtao): replace tf.gather with tf.gather_nd and try to get similar
# performance.
features_per_box = tf.reshape(tf.gather(features_r2, indices), [
batch_size, num_boxes, output_size * 2, output_size * 2,
num_filters
])
# Bilinear interpolation.
features_per_box = feature_bilinear_interpolation(
features_per_box, kernel_y, kernel_x)
return features_per_box