def __init__(self, x_in, ob_space, ac_space, lstm_class, lstm_layers):
# Flatten end expand with fake time dim to feed to LSTM bank:
x = tf.expand_dims(batch_flatten(x_in), [0])
# x = tf.expand_dims(self.flatten_homebrew(x_in), [0])
try:
if self.train_phase is not None:
pass
except:
self.train_phase = tf.placeholder_with_default(
tf.constant(False, dtype=tf.bool),
shape=(),
name='train_phase_flag_pl'
)
self.update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
#print('GOT HERE 2, x:', x.shape)
#print('GOT HERE 2, train_phase:', self.train_phase.shape)
#print('GOT HERE 2, update_ops:', self.update_ops)
# Define LSTM layers:
lstm = []
for size in lstm_layers:
lstm += [lstm_class(size, state_is_tuple=True)]
self.lstm = rnn.MultiRNNCell(lstm, state_is_tuple=True)
# self.lstm = lstm[0]
# Get time_dimension as [1]-shaped tensor:
step_size = tf.expand_dims(tf.shape(x)[1], [0])
#step_size = tf.shape(self.x)[:1]
#print('GOT HERE 3')
self.lstm_init_state = self.lstm.zero_state(1, dtype=tf.float32)
lstm_state_pl = self.rnn_placeholders(self.lstm.zero_state(1, dtype=tf.float32))
self.lstm_state_pl_flatten = flatten_nested(lstm_state_pl)
#print('GOT HERE 4, x:', x.shape)
lstm_outputs, self.lstm_state_out = tf.nn.dynamic_rnn(
self.lstm,
x,
initial_state=lstm_state_pl,
sequence_length=step_size,
time_major=False
)
#print('GOT HERE 5')
x = tf.reshape(lstm_outputs, [-1, lstm_layers[-1]])
self.logits = self.linear(x, ac_space, "action", self.normalized_columns_initializer(0.01))
self.vf = tf.reshape(self.linear(x, 1, "value", self.normalized_columns_initializer(1.0)), [-1])
self.sample = self.categorical_sample(self.logits, ac_space)[0, :]
self.var_list = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, tf.get_variable_scope().name)
# Add moving averages to save list (meant for Batch_norm layer):
moving_var_list = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, tf.get_variable_scope().name + '.*moving.*')
renorm_var_list = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES, tf.get_variable_scope().name + '.*renorm.*')
self.var_list += moving_var_list + renorm_var_list
def conv2d_autoencoder(inputs,
layer_config,
resize_method=tf.image.ResizeMethod.BILINEAR,
pad='SAME',
linear_layer_ref=linear,
name='base_conv2d_autoencoder',
reuse=False,
**kwargs):
"""
Basic convolutional autoencoder.
Hidden state is passed through dense linear layer.
Args:
inputs: input tensor
layer_config: layers configuration list: [layer_1_config, layer_2_config,...], where:
layer_i_config = [num_filters(int), filter_size(list), stride(list)];
this list represent decoder part of autoencoder bottleneck,
decoder part is inferred symmetrically
resize_method: up-sampling method, one of supported tf.image.ResizeMethod's
pad: str, padding scheme: 'SAME' or 'VALID'
linear_layer_ref: linear layer class to use
name: str, mame scope
reuse: bool
Returns:
list of tensors holding encoded features, layer_wise from outer to inner
tensor holding batch-wise flattened hidden state vector
list of tensors holding decoded features, layer-wise from inner to outer
tensor holding reconstructed output
None value
"""
with tf.variable_scope(name, reuse=reuse):
# Encode:
encoder_layers, shapes = conv2d_encoder(x=inputs,
layer_config=layer_config,
pad=pad,
reuse=reuse)
# Flatten hidden state, pass through dense :
z = batch_flatten(encoder_layers[-1])
h, w, c = encoder_layers[-1].get_shape().as_list()[1:]
z = linear_layer_ref(x=z,
size=h * w * c,
name='hidden_dense',
initializer=normalized_columns_initializer(1.0),
reuse=reuse)
# Reshape back and feed to decoder:
decoder_layers = conv2d_decoder(z=tf.reshape(z, [-1, h, w, c]),
layer_config=layer_config,
layer_shapes=shapes,
pad=pad,
resize_method=resize_method,
reuse=reuse)
y_hat = decoder_layers[-1]
return encoder_layers, z, decoder_layers, y_hat, None
def lstm_network(x,
a_r,
lstm_class=rnn.BasicLSTMCell,
lstm_layers=(256, ),
reuse=False):
"""Stage2 network: from features to flattened LSTM output.
Defines [multi-layered] dynamic [possibly shared] LSTM network.
Returns:
batch-wise flattened output tensor;
lstm initial state tensor;
lstm state output tensor;
lstm flattened feed placeholders as tuple.
"""
with tf.variable_scope('lstm', reuse=reuse):
# Flatten, add action/reward and expand with fake time dim to feed LSTM bank:
x = tf.concat([batch_flatten(x), a_r], axis=-1)
x = tf.expand_dims(x, [0])
# Define LSTM layers:
lstm = []
for size in lstm_layers:
lstm += [lstm_class(size, state_is_tuple=True)]
lstm = rnn.MultiRNNCell(lstm, state_is_tuple=True)
# Get time_dimension as [1]-shaped tensor:
step_size = tf.expand_dims(tf.shape(x)[1], [0])
lstm_init_state = lstm.zero_state(1, dtype=tf.float32)
lstm_state_pl = rnn_placeholders(lstm.zero_state(1, dtype=tf.float32))
lstm_state_pl_flatten = flatten_nested(lstm_state_pl)
lstm_outputs, lstm_state_out = tf.nn.dynamic_rnn(
lstm,
x,
initial_state=lstm_state_pl,
sequence_length=step_size,
time_major=False)
x_out = tf.reshape(lstm_outputs, [-1, lstm_layers[-1]])
return x_out, lstm_init_state, lstm_state_out, lstm_state_pl_flatten
def __init__(self, ob_space, ac_space, ff_size=64, **kwargs):
"""
Simple and computationally cheap feed-forward policy.
Args:
ob_space: dictionary of observation state shapes
ac_space: discrete action space shape (length)
ff_size: feed-forward dense layer size
**kwargs not used
"""
kwargs.update(dict(
conv_2d_filter_size=[3, 1],
conv_2d_stride=[2, 1],
))
self.ob_space = ob_space
self.ac_space = ac_space
self.aux_estimate = False
self.callback = {}
# Placeholders for obs. state input:
self.on_state_in = nested_placeholders(ob_space,
batch_dim=None,
name='on_policy_state_in')
self.off_state_in = nested_placeholders(ob_space,
batch_dim=None,
name='off_policy_state_in_pl')
self.rp_state_in = nested_placeholders(ob_space,
batch_dim=None,
name='rp_state_in')
# Placeholders for concatenated action [one-hot] and reward [scalar]:
self.on_a_r_in = tf.placeholder(tf.float32, [None, ac_space + 1],
name='on_policy_action_reward_in_pl')
self.off_a_r_in = tf.placeholder(tf.float32, [None, ac_space + 1],
name='off_policy_action_reward_in_pl')
# Placeholders for rnn batch and time-step dimensions:
self.on_batch_size = tf.placeholder(tf.int32,
name='on_policy_batch_size')
self.on_time_length = tf.placeholder(tf.int32,
name='on_policy_sequence_size')
self.off_batch_size = tf.placeholder(tf.int32,
name='off_policy_batch_size')
self.off_time_length = tf.placeholder(tf.int32,
name='off_policy_sequence_size')
# Base on-policy AAC network:
# Conv. layers:
on_aac_x = conv_2d_network(self.on_state_in['external'],
ob_space['external'], ac_space, **kwargs)
if False:
# Reshape rnn inputs for batch training as [rnn_batch_dim, rnn_time_dim, flattened_depth]:
x_shape_dynamic = tf.shape(on_aac_x)
max_seq_len = tf.cast(x_shape_dynamic[0] / self.on_batch_size,
tf.int32)
x_shape_static = on_aac_x.get_shape().as_list()
on_a_r_in = tf.reshape(
self.on_a_r_in,
[self.on_batch_size, max_seq_len, ac_space + 1])
on_aac_x = tf.reshape(
on_aac_x,
[self.on_batch_size, max_seq_len,
np.prod(x_shape_static[1:])])
# Feed last action_reward [, internal obs. state] into LSTM along with external state features:
on_stage2_input = [on_aac_x, on_a_r_in]
if 'internal' in list(self.on_state_in.keys()):
x_int_shape_static = self.on_state_in['internal'].get_shape(
).as_list()
x_int = tf.reshape(self.on_state_in['internal'], [
self.on_batch_size, max_seq_len,
np.prod(x_int_shape_static[1:])
])
on_stage2_input.append(x_int)
on_aac_x = tf.concat(on_stage2_input, axis=-1)
on_aac_x = batch_flatten(on_aac_x)
# Dense layer:
on_x_dense_out = tf.nn.elu(
linear(on_aac_x,
ff_size,
'dense_pi_v',
normalized_columns_initializer(0.01),
reuse=False))
# Dummy:
self.on_lstm_init_state = (LSTMStateTuple(c=np.zeros((1, 1)),
h=np.zeros((1, 1))), )
self.on_lstm_state_out = (LSTMStateTuple(c=np.zeros((1, 1)),
h=np.zeros((1, 1))), )
self.on_lstm_state_pl_flatten = [
tf.placeholder(shape=(None, 1), dtype=tf.float32, name='dummy_c'),
tf.placeholder(shape=(None, 1), dtype=tf.float32, name='dummy_h')
]
# Aac policy and value outputs and action-sampling function:
[self.on_logits, self.on_vf,
self.on_sample] = dense_aac_network(on_x_dense_out, ac_space)
# Batch-norm related (useless, ignore):
try:
if self.train_phase is not None:
pass
except AttributeError:
self.train_phase = tf.placeholder_with_default(
tf.constant(False, dtype=tf.bool),
shape=(),
name='train_phase_flag_pl')
self.update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
# Add moving averages to save list:
moving_var_list = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES,
tf.get_variable_scope().name + '.*moving.*')
renorm_var_list = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES,
tf.get_variable_scope().name + '.*renorm.*')
# What to save:
self.var_list = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
tf.get_variable_scope().name)
self.var_list += moving_var_list + renorm_var_list
def __init__(
self,
ob_space,
ac_space,
rp_sequence_size,
lstm_class=tf.contrib.rnn.LayerNormBasicLSTMCell,
#lstm_class=rnn.BasicLSTMCell,
lstm_layers=(256, 256),
aux_estimate=False,
encode_internal_state=False,
**kwargs):
"""
Defines [partially shared] on/off-policy networks for estimating action-logits, value function,
reward and state 'pixel_change' predictions.
Expects multi-modal observation as array of shape `ob_space`.
Args:
ob_space: dictionary of observation state shapes
ac_space: discrete action space shape (length)
rp_sequence_size: reward prediction sample length
lstm_class: tf.nn.lstm class
lstm_layers: tuple of LSTM layers sizes
aux_estimate: (bool), if True - add auxiliary tasks estimations to self.callbacks dictionary.
**kwargs not used
"""
# 1D plug-in:
kwargs.update(
dict(
conv_2d_filter_size=[3, 1],
conv_2d_stride=[2, 1],
conv_2d_num_filters=32,
pc_estimator_stride=[2, 1],
duell_pc_x_inner_shape=(6, 1,
32), # [6,3,32] if swapping W-C dims
duell_pc_filter_size=(4, 1),
duell_pc_stride=(2, 1),
))
self.ob_space = ob_space
self.ac_space = ac_space
self.rp_sequence_size = rp_sequence_size
self.lstm_class = lstm_class
self.lstm_layers = lstm_layers
self.aux_estimate = aux_estimate
self.callback = {}
self.encode_internal_state = encode_internal_state
self.debug = {}
# Placeholders for obs. state input:
self.on_state_in = nested_placeholders(ob_space,
batch_dim=None,
name='on_policy_state_in')
self.off_state_in = nested_placeholders(ob_space,
batch_dim=None,
name='off_policy_state_in_pl')
self.rp_state_in = nested_placeholders(ob_space,
batch_dim=None,
name='rp_state_in')
# Placeholders for concatenated action [one-hot] and reward [scalar]:
self.on_a_r_in = tf.placeholder(tf.float32, [None, ac_space + 1],
name='on_policy_action_reward_in_pl')
self.off_a_r_in = tf.placeholder(tf.float32, [None, ac_space + 1],
name='off_policy_action_reward_in_pl')
# Placeholders for rnn batch and time-step dimensions:
self.on_batch_size = tf.placeholder(tf.int32,
name='on_policy_batch_size')
self.on_time_length = tf.placeholder(tf.int32,
name='on_policy_sequence_size')
self.off_batch_size = tf.placeholder(tf.int32,
name='off_policy_batch_size')
self.off_time_length = tf.placeholder(tf.int32,
name='off_policy_sequence_size')
# Base on-policy AAC network:
# Conv. layers:
on_aac_x = conv_2d_network(self.on_state_in['external'],
ob_space['external'],
ac_space,
name='conv1d_external',
**kwargs)
# Aux min/max_loss:
if 'raw_state' in list(self.on_state_in.keys()):
self.raw_state = self.on_state_in['raw_state']
self.state_min_max = tf.nn.elu(
linear(batch_flatten(on_aac_x), 2, "min_max",
normalized_columns_initializer(0.01)))
else:
self.raw_state = None
self.state_min_max = None
# Reshape rnn inputs for batch training as [rnn_batch_dim, rnn_time_dim, flattened_depth]:
x_shape_dynamic = tf.shape(on_aac_x)
max_seq_len = tf.cast(x_shape_dynamic[0] / self.on_batch_size,
tf.int32)
x_shape_static = on_aac_x.get_shape().as_list()
on_a_r_in = tf.reshape(self.on_a_r_in,
[self.on_batch_size, max_seq_len, ac_space + 1])
on_aac_x = tf.reshape(
on_aac_x,
[self.on_batch_size, max_seq_len,
np.prod(x_shape_static[1:])])
# Prepare `internal` state, if any:
if 'internal' in list(self.on_state_in.keys()):
if self.encode_internal_state:
# Use convolution encoder:
on_x_internal = conv_2d_network(
self.on_state_in['internal'],
ob_space['internal'],
ac_space,
name='conv1d_internal',
# conv_2d_layer_ref=conv2d_dw,
conv_2d_num_filters=32,
conv_2d_num_layers=2,
conv_2d_filter_size=[3, 1],
conv_2d_stride=[2, 1],
)
x_int_shape_static = on_x_internal.get_shape().as_list()
on_x_internal = [
tf.reshape(on_x_internal, [
self.on_batch_size, max_seq_len,
np.prod(x_int_shape_static[1:])
])
]
self.debug['state_internal_enc'] = tf.shape(on_x_internal)
else:
# Feed as is:
x_int_shape_static = self.on_state_in['internal'].get_shape(
).as_list()
on_x_internal = tf.reshape(self.on_state_in['internal'], [
self.on_batch_size, max_seq_len,
np.prod(x_int_shape_static[1:])
])
self.debug['state_internal'] = tf.shape(
self.on_state_in['internal'])
on_x_internal = [on_x_internal]
else:
on_x_internal = []
# Not used:
if 'reward' in list(self.on_state_in.keys()):
x_rewards_shape_static = self.on_state_in['reward'].get_shape(
).as_list()
x_rewards = tf.reshape(self.on_state_in['reward'], [
self.on_batch_size, max_seq_len,
np.prod(x_rewards_shape_static[1:])
])
self.debug['rewards'] = tf.shape(x_rewards)
x_rewards = [x_rewards]
else:
x_rewards = []
self.debug['conv_input_to_lstm1'] = tf.shape(on_aac_x)
# Feed last last_reward into LSTM_1 layer along with encoded `external` state features:
on_stage2_1_input = [on_aac_x,
on_a_r_in[..., -1][..., None]] #+ on_x_internal
# Feed last_action, encoded `external` state, `internal` state into LSTM_2:
on_stage2_2_input = [on_aac_x, on_a_r_in] + on_x_internal
# LSTM_1 full input:
on_aac_x = tf.concat(on_stage2_1_input, axis=-1)
self.debug['concat_input_to_lstm1'] = tf.shape(on_aac_x)
# First LSTM layer takes encoded `external` state:
[on_x_lstm_1_out, self.on_lstm_1_init_state, self.on_lstm_1_state_out, self.on_lstm_1_state_pl_flatten] =\
lstm_network(on_aac_x, self.on_time_length, lstm_class, (lstm_layers[0],), name='lstm_1')
self.debug['on_x_lstm_1_out'] = tf.shape(on_x_lstm_1_out)
self.debug['self.on_lstm_1_state_out'] = tf.shape(
self.on_lstm_1_state_out)
self.debug['self.on_lstm_1_state_pl_flatten'] = tf.shape(
self.on_lstm_1_state_pl_flatten)
# For time_flat only: Reshape on_lstm_1_state_out from [1,2,20,size] -->[20,1,2,size] --> [20,1, 2xsize]:
reshape_lstm_1_state_out = tf.transpose(self.on_lstm_1_state_out,
[2, 0, 1, 3])
reshape_lstm_1_state_out_shape_static = reshape_lstm_1_state_out.get_shape(
).as_list()
reshape_lstm_1_state_out = tf.reshape(
reshape_lstm_1_state_out,
[
self.on_batch_size, max_seq_len,
np.prod(reshape_lstm_1_state_out_shape_static[-2:])
],
)
#self.debug['reshape_lstm_1_state_out'] = tf.shape(reshape_lstm_1_state_out)
# Take policy logits off first LSTM-dense layer:
# Reshape back to [batch, flattened_depth], where batch = rnn_batch_dim * rnn_time_dim:
x_shape_static = on_x_lstm_1_out.get_shape().as_list()
rsh_on_x_lstm_1_out = tf.reshape(
on_x_lstm_1_out, [x_shape_dynamic[0], x_shape_static[-1]])
self.debug['reshaped_on_x_lstm_1_out'] = tf.shape(rsh_on_x_lstm_1_out)
# Aac policy output and action-sampling function:
[self.on_logits, _,
self.on_sample] = dense_aac_network(rsh_on_x_lstm_1_out,
ac_space,
name='aac_dense_pi')
# Second LSTM layer takes concatenated encoded 'external' state, LSTM_1 output,
# last_action and `internal_state` (if present) tensors:
on_stage2_2_input += [on_x_lstm_1_out]
# Try: feed context instead of output
#on_stage2_2_input = [reshape_lstm_1_state_out] + on_stage2_1_input
# LSTM_2 full input:
on_aac_x = tf.concat(on_stage2_2_input, axis=-1)
self.debug['on_stage2_2_input'] = tf.shape(on_aac_x)
[on_x_lstm_2_out, self.on_lstm_2_init_state, self.on_lstm_2_state_out, self.on_lstm_2_state_pl_flatten] = \
lstm_network(on_aac_x, self.on_time_length, lstm_class, (lstm_layers[-1],), name='lstm_2')
self.debug['on_x_lstm_2_out'] = tf.shape(on_x_lstm_2_out)
self.debug['self.on_lstm_2_state_out'] = tf.shape(
self.on_lstm_2_state_out)
self.debug['self.on_lstm_2_state_pl_flatten'] = tf.shape(
self.on_lstm_2_state_pl_flatten)
# Reshape back to [batch, flattened_depth], where batch = rnn_batch_dim * rnn_time_dim:
x_shape_static = on_x_lstm_2_out.get_shape().as_list()
on_x_lstm_out = tf.reshape(on_x_lstm_2_out,
[x_shape_dynamic[0], x_shape_static[-1]])
self.debug['reshaped_on_x_lstm_out'] = tf.shape(on_x_lstm_out)
# Aac value function:
[_, self.on_vf, _] = dense_aac_network(on_x_lstm_out,
ac_space,
name='aac_dense_vfn')
# Concatenate LSTM placeholders, init. states and context:
self.on_lstm_init_state = (self.on_lstm_1_init_state,
self.on_lstm_2_init_state)
self.on_lstm_state_out = (self.on_lstm_1_state_out,
self.on_lstm_2_state_out)
self.on_lstm_state_pl_flatten = self.on_lstm_1_state_pl_flatten + self.on_lstm_2_state_pl_flatten
#if False: # Temp. disable
# Off-policy AAC network (shared):
off_aac_x = conv_2d_network(self.off_state_in['external'],
ob_space['external'],
ac_space,
name='conv1d_external',
reuse=True,
**kwargs)
# Reshape rnn inputs for batch training as [rnn_batch_dim, rnn_time_dim, flattened_depth]:
x_shape_dynamic = tf.shape(off_aac_x)
max_seq_len = tf.cast(x_shape_dynamic[0] / self.off_batch_size,
tf.int32)
x_shape_static = off_aac_x.get_shape().as_list()
off_a_r_in = tf.reshape(
self.off_a_r_in, [self.off_batch_size, max_seq_len, ac_space + 1])
off_aac_x = tf.reshape(
off_aac_x,
[self.off_batch_size, max_seq_len,
np.prod(x_shape_static[1:])])
# Prepare `internal` state, if any:
if 'internal' in list(self.off_state_in.keys()):
if self.encode_internal_state:
# Use convolution encoder:
off_x_internal = conv_2d_network(
self.off_state_in['internal'],
ob_space['internal'],
ac_space,
name='conv1d_internal',
# conv_2d_layer_ref=conv2d_dw,
conv_2d_num_filters=32,
conv_2d_num_layers=2,
conv_2d_filter_size=[3, 1],
conv_2d_stride=[2, 1],
reuse=True,
)
x_int_shape_static = off_x_internal.get_shape().as_list()
off_x_internal = [
tf.reshape(off_x_internal, [
self.off_batch_size, max_seq_len,
np.prod(x_int_shape_static[1:])
])
]
else:
x_int_shape_static = self.off_state_in['internal'].get_shape(
).as_list()
off_x_internal = tf.reshape(self.off_state_in['internal'], [
self.off_batch_size, max_seq_len,
np.prod(x_int_shape_static[1:])
])
off_x_internal = [off_x_internal]
else:
off_x_internal = []
off_stage2_1_input = [off_aac_x,
off_a_r_in[..., -1][...,
None]] #+ off_x_internal
off_stage2_2_input = [off_aac_x, off_a_r_in] + off_x_internal
off_aac_x = tf.concat(off_stage2_1_input, axis=-1)
[off_x_lstm_1_out, _, _, self.off_lstm_1_state_pl_flatten] =\
lstm_network(off_aac_x, self.off_time_length, lstm_class, (lstm_layers[0],), name='lstm_1', reuse=True)
# Reshape back to [batch, flattened_depth], where batch = rnn_batch_dim * rnn_time_dim:
x_shape_static = off_x_lstm_1_out.get_shape().as_list()
rsh_off_x_lstm_1_out = tf.reshape(
off_x_lstm_1_out, [x_shape_dynamic[0], x_shape_static[-1]])
[self.off_logits, _, _] =\
dense_aac_network(rsh_off_x_lstm_1_out, ac_space, name='aac_dense_pi', reuse=True)
off_stage2_2_input += [off_x_lstm_1_out]
# LSTM_2 full input:
off_aac_x = tf.concat(off_stage2_2_input, axis=-1)
[off_x_lstm_2_out, _, _, self.off_lstm_2_state_pl_flatten] = \
lstm_network(off_aac_x, self.off_time_length, lstm_class, (lstm_layers[-1],), name='lstm_2', reuse=True)
# Reshape back to [batch, flattened_depth], where batch = rnn_batch_dim * rnn_time_dim:
x_shape_static = off_x_lstm_2_out.get_shape().as_list()
off_x_lstm_out = tf.reshape(off_x_lstm_2_out,
[x_shape_dynamic[0], x_shape_static[-1]])
# Aac value function:
[_, self.off_vf, _] = dense_aac_network(off_x_lstm_out,
ac_space,
name='aac_dense_vfn',
reuse=True)
# Concatenate LSTM states:
self.off_lstm_state_pl_flatten = self.off_lstm_1_state_pl_flatten + self.off_lstm_2_state_pl_flatten
# Aux1:
# `Pixel control` network.
#
# Define pixels-change estimation function:
# Yes, it rather env-specific but for atari case it is handy to do it here, see self.get_pc_target():
[self.pc_change_state_in, self.pc_change_last_state_in, self.pc_target] =\
pixel_change_2d_estimator(ob_space['external'], **kwargs)
self.pc_batch_size = self.off_batch_size
self.pc_time_length = self.off_time_length
self.pc_state_in = self.off_state_in
self.pc_a_r_in = self.off_a_r_in
self.pc_lstm_state_pl_flatten = self.off_lstm_state_pl_flatten
# Shared conv and lstm nets, same off-policy batch:
pc_x = off_x_lstm_out
# PC duelling Q-network, outputs [None, 20, 20, ac_size] Q-features tensor:
self.pc_q = duelling_pc_network(pc_x, self.ac_space, **kwargs)
# Aux2:
# `Value function replay` network.
#
# VR network is fully shared with ppo network but with `value` only output:
# and has same off-policy batch pass with off_ppo network:
self.vr_batch_size = self.off_batch_size
self.vr_time_length = self.off_time_length
self.vr_state_in = self.off_state_in
self.vr_a_r_in = self.off_a_r_in
self.vr_lstm_state_pl_flatten = self.off_lstm_state_pl_flatten
self.vr_value = self.off_vf
# Aux3:
# `Reward prediction` network.
self.rp_batch_size = tf.placeholder(tf.int32, name='rp_batch_size')
# Shared conv. output:
rp_x = conv_2d_network(self.rp_state_in['external'],
ob_space['external'],
ac_space,
name='conv1d_external',
reuse=True,
**kwargs)
# Flatten batch-wise:
rp_x_shape_static = rp_x.get_shape().as_list()
rp_x = tf.reshape(rp_x, [
self.rp_batch_size,
np.prod(rp_x_shape_static[1:]) * (self.rp_sequence_size - 1)
])
# RP output:
self.rp_logits = dense_rp_network(rp_x)
# Batch-norm related (useless, ignore):
try:
if self.train_phase is not None:
pass
except AttributeError:
self.train_phase = tf.placeholder_with_default(
tf.constant(False, dtype=tf.bool),
shape=(),
name='train_phase_flag_pl')
self.update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
# Add moving averages to save list:
moving_var_list = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES,
tf.get_variable_scope().name + '.*moving.*')
renorm_var_list = tf.get_collection(
tf.GraphKeys.GLOBAL_VARIABLES,
tf.get_variable_scope().name + '.*renorm.*')
# What to save:
self.var_list = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES,
tf.get_variable_scope().name)
self.var_list += moving_var_list + renorm_var_list
# Callbacks:
if self.aux_estimate:
self.callback['pixel_change'] = self.get_pc_target
def beta_var_conv2d_autoencoder(
inputs,
layer_config,
resize_method=tf.image.ResizeMethod.BILINEAR,
pad='SAME',
linear_layer_ref=linear,
name='vae_conv2d',
max_batch_size=256,
reuse=False
):
"""
Variational autoencoder.
Papers:
https://arxiv.org/pdf/1312.6114.pdf
https://arxiv.org/pdf/1606.05908.pdf
http://www.matthey.me/pdf/betavae_iclr_2017.pdf
Args:
inputs: input tensor
layer_config: layers configuration list: [layer_1_config, layer_2_config,...], where:
layer_i_config = [num_filters(int), filter_size(list), stride(list)];
this list represent decoder part of autoencoder bottleneck,
decoder part is inferred symmetrically
resize_method: up-sampling method, one of supported tf.image.ResizeMethod's
pad: str, padding scheme: 'SAME' or 'VALID'
linear_layer_ref: linear layer class - not used
name: str, mame scope
max_batch_size: int, dynamic batch size should be no greater than this value
reuse: bool
Returns:
list of tensors holding encoded features, layer_wise from outer to inner
tensor holding batch-wise flattened hidden state vector
list of tensors holding decoded features, layer-wise from inner to outer
tensor holding reconstructed output
tensor holding estimated KL divergence
"""
with tf.variable_scope(name, reuse=reuse):
# Encode:
encoder_layers, shapes = conv2d_encoder(
x=inputs,
layer_config=layer_config,
pad=pad,
reuse=reuse
)
# Flatten hidden state, pass through dense:
z_flat = batch_flatten(encoder_layers[-1])
h, w, c = encoder_layers[-1].get_shape().as_list()[1:]
z = tf.nn.elu(
linear(
x=z_flat,
size=h * w * c,
name='enc_dense',
initializer=normalized_columns_initializer(1.0),
reuse=reuse
)
)
# TODO: revert back to dubled Z-size
# half_size_z = h * w * c
# size_z = 2 * half_size_z
size_z = int(h * w * c/2)
z = tf.nn.elu(
linear(
#x=z_flat,
x=z,
#size=size_z,
size=size_z * 2,
name='hidden_dense',
initializer=normalized_columns_initializer(1.0),
reuse=reuse
)
)
# Get sample parameters:
#mu, log_sigma = tf.split(z, [half_size_z, half_size_z], axis=-1)
mu, log_sigma = tf.split(z, [size_z, size_z], axis=-1)
# Oversized noise generator:
#eps = tf.random_normal(shape=[max_batch_size, half_size_z], mean=0., stddev=1.)
eps = tf.random_normal(shape=[max_batch_size, size_z], mean=0., stddev=1.)
eps = eps[:tf.shape(z)[0],:]
# Get sample z ~ Q(z|X):
z_sampled = mu + tf.exp(log_sigma / 2) * eps
# D_KL(Q(z|X) || P(z|X)):
# TODO: where is sum?!
d_kl = 0.5 * (tf.exp(log_sigma) + tf.square(mu) - 1. - log_sigma)
# Reshape back and feed to decoder:
z_sampled_dec = tf.nn.elu(
linear(
x=z_sampled,
size=h * w * c,
name='dec_dense',
initializer=normalized_columns_initializer(1.0),
reuse=reuse
)
)
decoder_layers = conv2d_decoder(
z=tf.reshape(z_sampled_dec, [-1, h, w, c]),
layer_config=layer_config,
layer_shapes=shapes,
pad=pad,
resize_method=resize_method,
reuse=reuse
)
y_hat = decoder_layers[-1]
return encoder_layers, z_sampled, decoder_layers, y_hat, d_kl