def __init__(self, name, input_shape, output_dim, hidden_dim, hidden_nonlinearity=tf.nn.relu,
gru_layer_cls=L.GRULayer,
output_nonlinearity=None, input_var=None, input_layer=None, layer_args=None):
with tf.variable_scope(name):
if input_layer is None:
l_in = L.InputLayer(
shape=(None, None) + input_shape, input_var=input_var, name="input")
else:
l_in = input_layer
l_step_input = L.InputLayer(
shape=(None,) + input_shape, name="step_input")
l_step_prev_state = L.InputLayer(
shape=(None, hidden_dim), name="step_prev_state")
if layer_args is None:
layer_args = dict()
l_gru = gru_layer_cls(l_in, num_units=hidden_dim, hidden_nonlinearity=hidden_nonlinearity,
hidden_init_trainable=False, name="gru", **layer_args)
l_gru_flat = L.ReshapeLayer(
l_gru, shape=(-1, hidden_dim),
name="gru_flat"
)
l_output_flat = L.DenseLayer(
l_gru_flat,
num_units=output_dim,
nonlinearity=output_nonlinearity,
name="output_flat"
)
l_output = L.OpLayer(
l_output_flat,
op=lambda flat_output, l_input:
tf.reshape(flat_output, tf.pack(
(tf.shape(l_input)[0], tf.shape(l_input)[1], -1))),
shape_op=lambda flat_output_shape, l_input_shape:
(l_input_shape[0], l_input_shape[1], flat_output_shape[-1]),
extras=[l_in],
name="output"
)
l_step_state = l_gru.get_step_layer(
l_step_input, l_step_prev_state, name="step_state")
l_step_hidden = l_step_state
l_step_output = L.DenseLayer(
l_step_hidden,
num_units=output_dim,
nonlinearity=output_nonlinearity,
W=l_output_flat.W,
b=l_output_flat.b,
name="step_output"
)
self._l_in = l_in
self._hid_init_param = l_gru.h0
self._l_gru = l_gru
self._l_out = l_output
self._l_step_input = l_step_input
self._l_step_prev_state = l_step_prev_state
self._l_step_hidden = l_step_hidden
self._l_step_state = l_step_state
self._l_step_output = l_step_output
self._hidden_dim = hidden_dim
def __init__(self, name, output_dim, hidden_sizes, hidden_nonlinearity,
output_nonlinearity, hidden_W_init=L.XavierUniformInitializer(), hidden_b_init=tf.zeros_initializer,
output_W_init=L.XavierUniformInitializer(), output_b_init=tf.zeros_initializer, batch_size=None,
input_var=None, input_layer=None, input_shape=None, batch_normalization=False, weight_normalization=False,
):
Serializable.quick_init(self, locals())
self.name = name
with tf.variable_scope(name):
if input_layer is None:
l_in = L.InputLayer(
shape=(batch_size,) + input_shape, input_var=input_var, name="input")
else:
l_in = input_layer
self._layers = [l_in]
l_hid = l_in
if batch_normalization:
ls = L.batch_norm(l_hid)
l_hid = ls[-1]
self._layers += ls
for idx, hidden_size in enumerate(hidden_sizes):
l_hid = L.DenseLayer(
l_hid,
num_units=hidden_size,
nonlinearity=hidden_nonlinearity,
name="hidden_%d" % idx,
W=hidden_W_init,
b=hidden_b_init,
weight_normalization=weight_normalization
)
if batch_normalization:
ls = L.batch_norm(l_hid)
l_hid = ls[-1]
self._layers += ls
self._layers.append(l_hid)
l_out = L.DenseLayer(
l_hid,
num_units=output_dim,
nonlinearity=output_nonlinearity,
name="output",
W=output_W_init,
b=output_b_init,
weight_normalization=weight_normalization
)
if batch_normalization:
ls = L.batch_norm(l_out)
l_out = ls[-1]
self._layers += ls
self._layers.append(l_out)
self._l_in = l_in
self._l_out = l_out
self._l_tar = L.InputLayer(
shape=(batch_size,) + (output_dim,), input_var=input_var, name="target")
# self._input_var = l_in.input_var
self._output = L.get_output(l_out)
LayersPowered.__init__(self, l_out)
def feedforward(l_hid,
hidden_sizes,
hidden_nonlinearity,
weight_normalization=False,
hidden_W_init=L.XavierUniformInitializer(),
hidden_b_init=tf.zeros_initializer,
linear_output=False,
start_idx=0):
for idx, hidden_size in enumerate(hidden_sizes):
if linear_output and (idx == (len(hidden_sizes) - 1)):
nonlin = None
else:
nonlin = hidden_nonlinearity
l_hid = L.DenseLayer(l_hid,
num_units=hidden_size,
nonlinearity=hidden_nonlinearity,
name="hidden_%d" % (idx + start_idx),
W=hidden_W_init,
b=hidden_b_init,
weight_normalization=weight_normalization)
return l_hid
def __init__(self,
name,
input_shape,
output_dim,
hidden_dim,
hidden_nonlinearity=tf.nn.relu,
lstm_layer_cls=L.LSTMLayer,
output_nonlinearity=None,
input_var=None,
input_layer=None,
forget_bias=1.0,
use_peepholes=False,
layer_args=None):
with tf.variable_scope(name):
if input_layer is None:
l_in = L.InputLayer(shape=(None, None) + input_shape,
input_var=input_var,
name="input")
else:
l_in = input_layer
l_step_input = L.InputLayer(shape=(None, ) + input_shape,
name="step_input")
# contains previous hidden and cell state
l_step_prev_state = L.InputLayer(shape=(None, hidden_dim * 2),
name="step_prev_state")
if layer_args is None:
layer_args = dict()
l_lstm = lstm_layer_cls(l_in,
num_units=hidden_dim,
hidden_nonlinearity=hidden_nonlinearity,
hidden_init_trainable=False,
name="lstm",
forget_bias=forget_bias,
cell_init_trainable=False,
use_peepholes=use_peepholes,
**layer_args)
l_lstm_flat = L.ReshapeLayer(l_lstm,
shape=(-1, hidden_dim),
name="lstm_flat")
l_output_flat = L.DenseLayer(l_lstm_flat,
num_units=output_dim,
nonlinearity=output_nonlinearity,
name="output_flat")
l_output = L.OpLayer(
l_output_flat,
op=lambda flat_output, l_input: tf.reshape(
flat_output,
tf.stack(
(tf.shape(l_input)[0], tf.shape(l_input)[1], -1))),
shape_op=lambda flat_output_shape, l_input_shape:
(l_input_shape[0], l_input_shape[1], flat_output_shape[-1]),
extras=[l_in],
name="output")
l_step_state = l_lstm.get_step_layer(l_step_input,
l_step_prev_state,
name="step_state")
l_step_hidden = L.SliceLayer(l_step_state,
indices=slice(hidden_dim),
name="step_hidden")
l_step_cell = L.SliceLayer(l_step_state,
indices=slice(hidden_dim, None),
name="step_cell")
l_step_output = L.DenseLayer(l_step_hidden,
num_units=output_dim,
nonlinearity=output_nonlinearity,
W=l_output_flat.W,
b=l_output_flat.b,
name="step_output")
self._l_in = l_in
self._hid_init_param = l_lstm.h0
self._cell_init_param = l_lstm.c0
self._l_lstm = l_lstm
self._l_out = l_output
self._l_step_input = l_step_input
self._l_step_prev_state = l_step_prev_state
self._l_step_hidden = l_step_hidden
self._l_step_cell = l_step_cell
self._l_step_state = l_step_state
self._l_step_output = l_step_output
self._hidden_dim = hidden_dim
def __init__(self,
name,
input_shape,
output_dim,
conv_filters,
conv_filter_sizes,
conv_strides,
conv_pads,
hidden_sizes,
hidden_nonlinearity,
output_nonlinearity,
hidden_W_init=L.XavierUniformInitializer(),
hidden_b_init=tf.zeros_initializer,
output_W_init=L.XavierUniformInitializer(),
output_b_init=tf.zeros_initializer,
input_var=None,
input_layer=None,
batch_normalization=False,
weight_normalization=False):
Serializable.quick_init(self, locals())
"""
A network composed of several convolution layers followed by some fc layers.
input_shape: (width,height,channel)
HOWEVER, network inputs are assumed flattened. This network will first unflatten the inputs and then apply the standard convolutions and so on.
conv_filters: a list of numbers of convolution kernel
conv_filter_sizes: a list of sizes (int) of the convolution kernels
conv_strides: a list of strides (int) of the conv kernels
conv_pads: a list of pad formats (either 'SAME' or 'VALID')
hidden_nonlinearity: a nonlinearity from tf.nn, shared by all conv and fc layers
hidden_sizes: a list of numbers of hidden units for all fc layers
"""
with tf.variable_scope(name):
if input_layer is not None:
l_in = input_layer
l_hid = l_in
elif len(input_shape) == 3:
l_in = L.InputLayer(shape=(None, np.prod(input_shape)),
input_var=input_var,
name="input")
l_hid = L.reshape(l_in, ([0], ) + input_shape,
name="reshape_input")
elif len(input_shape) == 2:
l_in = L.InputLayer(shape=(None, np.prod(input_shape)),
input_var=input_var,
name="input")
input_shape = (1, ) + input_shape
l_hid = L.reshape(l_in, ([0], ) + input_shape,
name="reshape_input")
else:
l_in = L.InputLayer(shape=(None, ) + input_shape,
input_var=input_var,
name="input")
l_hid = l_in
if batch_normalization:
l_hid = L.batch_norm(l_hid)
for idx, conv_filter, filter_size, stride, pad in zip(
range(len(conv_filters)),
conv_filters,
conv_filter_sizes,
conv_strides,
conv_pads,
):
l_hid = L.Conv2DLayer(
l_hid,
num_filters=conv_filter,
filter_size=filter_size,
stride=(stride, stride),
pad=pad,
nonlinearity=hidden_nonlinearity,
name="conv_hidden_%d" % idx,
weight_normalization=weight_normalization,
)
if batch_normalization:
l_hid = L.batch_norm(l_hid)
if output_nonlinearity == L.spatial_expected_softmax:
assert len(hidden_sizes) == 0
assert output_dim == conv_filters[-1] * 2
l_hid.nonlinearity = tf.identity
l_out = L.SpatialExpectedSoftmaxLayer(l_hid)
else:
l_hid = L.flatten(l_hid, name="conv_flatten")
for idx, hidden_size in enumerate(hidden_sizes):
l_hid = L.DenseLayer(
l_hid,
num_units=hidden_size,
nonlinearity=hidden_nonlinearity,
name="hidden_%d" % idx,
W=hidden_W_init,
b=hidden_b_init,
weight_normalization=weight_normalization,
)
if batch_normalization:
l_hid = L.batch_norm(l_hid)
l_out = L.DenseLayer(
l_hid,
num_units=output_dim,
nonlinearity=output_nonlinearity,
name="output",
W=output_W_init,
b=output_b_init,
weight_normalization=weight_normalization,
)
if batch_normalization:
l_out = L.batch_norm(l_out)
self._l_in = l_in
self._l_out = l_out
# self._input_var = l_in.input_var
LayersPowered.__init__(self, l_out)
def __init__(self,
name,
input_shape,
output_dim,
z_dim,
pre_hidden_sizes,
post_hidden_sizes,
hidden_nonlinearity,
output_nonlinearity,
hidden_W_init=L.XavierUniformInitializer(),
hidden_b_init=tf.zeros_initializer,
output_W_init=L.XavierUniformInitializer(),
output_b_init=tf.zeros_initializer,
batch_size=None,
input_var=None,
input_layer=None,
weight_normalization=False):
Serializable.quick_init(self, locals())
self.name = name
with tf.variable_scope(name):
if input_layer is None:
l_in = L.InputLayer(shape=(batch_size, ) + input_shape,
input_var=input_var,
name="input")
else:
l_in = input_layer
self._layers = [l_in]
# construct graph
l_hid = feedforward(l_in,
pre_hidden_sizes,
hidden_nonlinearity,
hidden_W_init=hidden_W_init,
hidden_b_init=hidden_b_init,
weight_normalization=weight_normalization,
start_idx=0)
l_lat = L.LatentLayer(l_hid, z_dim)
l_hid = feedforward(l_lat,
post_hidden_sizes,
hidden_nonlinearity,
hidden_W_init=hidden_W_init,
hidden_b_init=hidden_b_init,
weight_normalization=weight_normalization,
start_idx=len(pre_hidden_sizes))
# create output layer
l_out = L.DenseLayer(l_hid,
num_units=output_dim,
nonlinearity=output_nonlinearity,
name="output",
W=output_W_init,
b=output_b_init,
weight_normalization=weight_normalization)
self._layers.append(l_out)
self._l_lat = l_lat
self._z_dim = z_dim
self._l_in = l_in
self._l_out = l_out
self._l_tar = L.InputLayer(shape=(batch_size, ) + (output_dim, ),
input_var=input_var,
name="target")
# complexity loss for variational posterior
z_mu, z_sig = self._l_lat.get_dparams_for(
L.get_output(self._l_lat.input_layer))
self.kl_cost = kl_from_prior(z_mu, z_sig, self._z_dim)
# self._input_var = l_in.input_var
self._output = L.get_output(l_out)
LayersPowered.__init__(self, l_out)
def __init__(
self,
name,
input_shape,
output_dim,
hidden_sizes,
hidden_nonlinearity,
output_nonlinearity,
z_dim,
z_idx,
z_hidden_sizes,
merge="mul",
hidden_W_init=L.XavierUniformInitializer(),
hidden_b_init=tf.zeros_initializer,
output_W_init=L.XavierUniformInitializer(),
output_b_init=tf.zeros_initializer,
batch_size=None,
input_var=None,
input_layer=None,
batch_normalization=False,
weight_normalization=False,
):
Serializable.quick_init(self, locals())
self.name = name
total_dim = np.prod(input_shape)
with tf.variable_scope(name):
if input_layer is None:
l_in = L.InputLayer(shape=(batch_size, ) + input_shape,
input_var=input_var,
name="input")
else:
l_in = input_layer
self._layers = [l_in]
# slice off features / observation
l_feat = L.SliceLayer(l_in,
indices=slice(0, total_dim - z_dim),
name="l_feat")
# slice off z "style" variable
l_z = L.SliceLayer(l_in,
indices=slice(total_dim - z_dim, total_dim),
name="l_z")
l_pre = feedforward(l_feat,
hidden_sizes[:z_idx],
hidden_nonlinearity,
linear_output=True)
with tf.variable_scope("z"):
# if merging mul, ensure dimensionalities match.
if merge == "mul":
_head = [total_dim] + hidden_sizes
_head = [_head[z_idx]]
elif merge == "concat":
_head = []
l_z = feedforward(l_z,
z_hidden_sizes + _head,
hidden_nonlinearity,
linear_output=True)
# merge latent code with features
if merge == "mul":
l_merge = L.ElemwiseMulLayer([l_pre, l_z])
elif merge == "concat":
l_merge = L.ConcatLayer([l_pre, l_z], axis=1)
else:
raise NotImplementedError
if z_idx > 0:
l_merge = L.NonlinearityLayer(l_merge, hidden_nonlinearity)
l_hid = feedforward(l_merge,
hidden_sizes[z_idx:],
hidden_nonlinearity,
start_idx=z_idx)
l_out = L.DenseLayer(l_hid,
num_units=output_dim,
nonlinearity=output_nonlinearity,
name="output",
W=output_W_init,
b=output_b_init,
weight_normalization=weight_normalization)
#if batch_normalization:
# ls = L.batch_norm(l_out)
# l_out = ls[-1]
# self._layers += ls
self._layers.append(l_out)
self._l_in = l_in
self._l_out = l_out
self._l_tar = L.InputLayer(shape=(batch_size, ) + (output_dim, ),
input_var=input_var,
name="target")
# self._input_var = l_in.input_var
self._output = L.get_output(l_out)
LayersPowered.__init__(self, l_out)