def test_get_output_for_shared_axes(self, shared_axes):
from lasagne.layers.noise import DropoutLayer
layer = DropoutLayer((2, 4, 7, 9), shared_axes=shared_axes)
input = theano.shared(numpy.ones((2, 4, 7, 9)))
result = layer.get_output_for(input)
result_eval = result.eval()
# check if the dropout mask is the same across the specified axes:
# compute the mean across these axes and compare against the full
# output, broadcasting across the shared axes, to see if it matches
assert np.allclose(result_eval.mean(axis=shared_axes, keepdims=True),
result_eval)
def test_get_output_for_shared_axes(self, shared_axes):
from lasagne.layers.noise import DropoutLayer
layer = DropoutLayer((2, 4, 7, 9), shared_axes=shared_axes)
input = theano.shared(numpy.ones((2, 4, 7, 9)))
result = layer.get_output_for(input)
result_eval = result.eval()
# check if the dropout mask is the same across the specified axes:
# compute the mean across these axes and compare against the full
# output, broadcasting across the shared axes, to see if it matches
assert np.allclose(result_eval.mean(axis=shared_axes, keepdims=True),
result_eval)
def test_specified_rng(self, input_layer):
from lasagne.layers.noise import DropoutLayer
input = theano.shared(numpy.ones((100, 100)))
seed = 123456789
set_rng(RandomState(seed))
result = DropoutLayer(input_layer).get_output_for(input)
result_eval1 = result.eval()
set_rng(RandomState(seed))
result = DropoutLayer(input_layer).get_output_for(input)
result_eval2 = result.eval()
assert numpy.allclose(result_eval1, result_eval2)
def conv_pool_block(l, num_filters, filter_length, i_block):
l = DropoutLayer(l, p=self.drop_prob)
l = Conv2DLayer(l,
num_filters=num_filters,
filter_size=[filter_length, 1],
nonlinearity=identity,
name='combined_conv_{:d}'.format(i_block))
if self.double_time_convs:
l = Conv2DLayer(l,
num_filters=num_filters,
filter_size=[filter_length, 1],
nonlinearity=identity,
name='combined_conv_{:d}'.format(i_block))
if self.batch_norm:
l = BatchNormLayer(l,
epsilon=1e-4,
alpha=self.batch_norm_alpha,
nonlinearity=self.later_nonlin)
else:
l = NonlinearityLayer(l, nonlinearity=self.later_nonlin)
l = Pool2DLayer(l,
pool_size=[self.pool_time_length, 1],
stride=[1, 1],
mode=self.later_pool_mode)
l = StrideReshapeLayer(l, n_stride=self.pool_time_stride)
l = NonlinearityLayer(l, self.later_pool_nonlin)
return l
def get_layers(self):
l = InputLayer([None, self.in_chans, self.input_time_length, 1])
if self.split_first_layer:
l = DimshuffleLayer(l, pattern=[0, 3, 2, 1])
l = Conv2DLayer(l,
num_filters=self.n_filters_time,
filter_size=[self.filter_time_length, 1],
nonlinearity=identity,
name='time_conv')
l = Conv2DAllColsLayer(l,
num_filters=self.n_filters_spat,
filter_size=[1, -1],
nonlinearity=identity,
name='spat_conv')
else: #keep channel dim in first dim, so it will also be convolved over
l = Conv2DLayer(l,
num_filters=self.num_filters_time,
filter_size=[self.filter_time_length, 1],
nonlinearity=identity,
name='time_conv')
if self.batch_norm:
l = BatchNormLayer(l,
epsilon=1e-4,
alpha=self.batch_norm_alpha,
nonlinearity=self.conv_nonlin)
else:
l = NonlinearityLayer(l, nonlinearity=self.conv_nonlin)
l = Pool2DLayer(l,
pool_size=[self.pool_time_length, 1],
stride=[1, 1],
mode=self.pool_mode)
l = NonlinearityLayer(l, self.pool_nonlin)
l = StrideReshapeLayer(l, n_stride=self.pool_time_stride)
l = DropoutLayer(l, p=self.drop_prob)
l = Conv2DLayer(l,
num_filters=self.n_classes,
filter_size=[self.final_dense_length, 1],
nonlinearity=identity,
name='final_dense')
l = FinalReshapeLayer(l)
l = NonlinearityLayer(l, softmax)
return lasagne.layers.get_all_layers(l)
def test_specified_rng(self, input_layer):
from lasagne.layers.noise import DropoutLayer
input = theano.shared(numpy.ones((100, 100)))
seed = 123456789
rng = get_rng()
set_rng(RandomState(seed))
result = DropoutLayer(input_layer).get_output_for(input)
result_eval1 = result.eval()
set_rng(RandomState(seed))
result = DropoutLayer(input_layer).get_output_for(input)
result_eval2 = result.eval()
set_rng(rng) # reset to original RNG for other tests
assert numpy.allclose(result_eval1, result_eval2)
def test_get_output_for_p_float16(self, input_layer):
from lasagne.layers.noise import DropoutLayer
layer = DropoutLayer(input_layer, p=numpy.float16(0.5))
input = theano.shared(numpy.ones((100, 100), dtype=numpy.float16))
assert layer.get_output_for(input).dtype == input.dtype
def layer_p_02(self, input_layer):
from lasagne.layers.noise import DropoutLayer
return DropoutLayer(input_layer, p=0.2)
def layer_no_rescale(self, input_layer):
from lasagne.layers.noise import DropoutLayer
return DropoutLayer(input_layer, rescale=False)
def test_get_output_for_p_float32(self, input_layer):
from lasagne.layers.noise import DropoutLayer
layer = DropoutLayer(input_layer, p=numpy.float32(0.5))
input = theano.shared(numpy.ones((100, 100), dtype=numpy.float32))
assert layer.get_output_for(input).dtype == input.dtype
def get_layers(self):
l = InputLayer([None, self.in_chans, self.input_time_length, 1])
if self.split_first_layer:
l = DimshuffleLayer(l, pattern=[0, 3, 2, 1])
l = DropoutLayer(l, p=self.drop_in_prob)
l = Conv2DLayer(l,
num_filters=self.num_filters_time,
filter_size=[self.filter_time_length, 1],
nonlinearity=identity,
name='time_conv')
if self.double_time_convs:
l = Conv2DLayer(l,
num_filters=self.num_filters_time,
filter_size=[self.filter_time_length, 1],
nonlinearity=identity,
name='time_conv')
l = Conv2DAllColsLayer(l,
num_filters=self.num_filters_spat,
filter_size=[1, -1],
nonlinearity=identity,
name='spat_conv')
else: #keep channel dim in first dim, so it will also be convolved over
l = DropoutLayer(l, p=self.drop_in_prob)
l = Conv2DLayer(l,
num_filters=self.num_filters_time,
filter_size=[self.filter_time_length, 1],
nonlinearity=identity,
name='time_conv')
if self.double_time_convs:
l = Conv2DLayer(l,
num_filters=self.num_filters_time,
filter_size=[self.filter_time_length, 1],
nonlinearity=identity,
name='time_conv')
if self.batch_norm:
l = BatchNormLayer(l,
epsilon=1e-4,
alpha=self.batch_norm_alpha,
nonlinearity=self.first_nonlin)
else:
l = NonlinearityLayer(l, nonlinearity=self.first_nonlin)
l = Pool2DLayer(l,
pool_size=[self.pool_time_length, 1],
stride=[1, 1],
mode=self.first_pool_mode)
l = StrideReshapeLayer(l, n_stride=self.pool_time_stride)
l = NonlinearityLayer(l, self.first_pool_nonlin)
def conv_pool_block(l, num_filters, filter_length, i_block):
l = DropoutLayer(l, p=self.drop_prob)
l = Conv2DLayer(l,
num_filters=num_filters,
filter_size=[filter_length, 1],
nonlinearity=identity,
name='combined_conv_{:d}'.format(i_block))
if self.double_time_convs:
l = Conv2DLayer(l,
num_filters=num_filters,
filter_size=[filter_length, 1],
nonlinearity=identity,
name='combined_conv_{:d}'.format(i_block))
if self.batch_norm:
l = BatchNormLayer(l,
epsilon=1e-4,
alpha=self.batch_norm_alpha,
nonlinearity=self.later_nonlin)
else:
l = NonlinearityLayer(l, nonlinearity=self.later_nonlin)
l = Pool2DLayer(l,
pool_size=[self.pool_time_length, 1],
stride=[1, 1],
mode=self.later_pool_mode)
l = StrideReshapeLayer(l, n_stride=self.pool_time_stride)
l = NonlinearityLayer(l, self.later_pool_nonlin)
return l
l = conv_pool_block(l, self.num_filters_2, self.filter_length_2, 2)
l = conv_pool_block(l, self.num_filters_3, self.filter_length_3, 3)
l = conv_pool_block(l, self.num_filters_4, self.filter_length_4, 4)
# Final part, transformed dense layer
l = DropoutLayer(l, p=self.drop_prob)
l = Conv2DLayer(l,
num_filters=self.n_classes,
filter_size=[self.final_dense_length, 1],
nonlinearity=identity,
name='final_dense')
l = FinalReshapeLayer(l)
l = NonlinearityLayer(l, self.final_nonlin)
return lasagne.layers.get_all_layers(l)
def get_layers(self):
def resnet_residual_block(model,
increase_units_factor=None,
half_time=False):
"""Calling residual_block function with correct attributes
from this object.
Parameters
----------
model :
increase_units_factor :
(Default value = None)
half_time :
(Default value = False)
Returns
-------
Final layer of created residual block.
"""
return residual_block(model,
batch_norm_epsilon=self.batch_norm_epsilon,
batch_norm_alpha=self.batch_norm_alpha,
increase_units_factor=increase_units_factor,
half_time=half_time,
nonlinearity=self.nonlinearity,
projection=self.projection,
survival_prob=self.survival_prob,
add_after_nonlin=self.add_after_nonlin,
reduction_method=self.reduction_method,
reduction_pool_mode=self.reduction_pool_mode)
model = InputLayer([None, self.in_chans, self.input_time_length, 1])
if self.split_first_layer:
# shift channel dim out
model = DimshuffleLayer(model, (0, 3, 2, 1))
# first timeconv
model = Conv2DLayer(model,
num_filters=self.n_first_filters,
filter_size=(self.first_filter_length, 1),
stride=(1, 1),
nonlinearity=identity,
pad='same',
W=lasagne.init.HeNormal(gain='relu'))
# now spatconv
model = batch_norm(Conv2DLayer(
model,
num_filters=self.n_first_filters,
filter_size=(1, self.in_chans),
stride=(1, 1),
nonlinearity=self.nonlinearity,
pad=0,
W=lasagne.init.HeNormal(gain='relu')),
epsilon=self.batch_norm_epsilon,
alpha=self.batch_norm_alpha)
else:
model = batch_norm(Conv2DLayer(
model,
num_filters=self.n_first_filters,
filter_size=(self.first_filter_length, 1),
stride=(1, 1),
nonlinearity=self.nonlinearity,
pad='same',
W=lasagne.init.HeNormal(gain='relu')),
epsilon=self.batch_norm_epsilon,
alpha=self.batch_norm_alpha)
for _ in range(self.n_layers_per_block):
model = resnet_residual_block(model)
model = resnet_residual_block(model,
increase_units_factor=2,
half_time=True)
for _ in range(1, self.n_layers_per_block):
model = resnet_residual_block(model)
model = resnet_residual_block(model,
increase_units_factor=1.5,
half_time=True)
for _ in range(1, self.n_layers_per_block):
model = resnet_residual_block(model)
model = resnet_residual_block(model, half_time=True)
for _ in range(1, self.n_layers_per_block):
model = resnet_residual_block(model)
model = resnet_residual_block(model, half_time=True)
for _ in range(1, self.n_layers_per_block):
model = resnet_residual_block(model)
model = resnet_residual_block(model, half_time=True)
for _ in range(1, self.n_layers_per_block):
model = resnet_residual_block(model)
model = resnet_residual_block(model, half_time=True)
if self.drop_before_pool:
model = DropoutLayer(model, p=0.5)
# Replacement for global mean pooling
if self.final_aggregator == 'pool':
model = Pool2DLayer(model,
pool_size=(self.final_pool_length, 1),
stride=(1, 1),
mode='average_exc_pad')
model = Conv2DLayer(model,
filter_size=(1, 1),
num_filters=4,
W=lasagne.init.HeNormal(),
nonlinearity=identity)
elif self.final_aggregator == 'conv':
model = Conv2DLayer(model,
filter_size=(self.final_pool_length, 1),
num_filters=4,
W=lasagne.init.HeNormal(),
nonlinearity=identity)
else:
raise ValueError("Unknown final aggregator {:s}".format(
self.final_aggregator))
model = FinalReshapeLayer(model)
model = NonlinearityLayer(model, nonlinearity=self.final_nonlin)
model = set_survival_probs_to_linear_decay(model, self.survival_prob)
return lasagne.layers.get_all_layers(model)
def build_nmt_encoder_decoder(dim_word=1,
n_embd=100,
n_units=500,
n_proj=200,
state=None,
rev_state=None,
context_type=None,
attention=False,
drop_p=None):
enc = OrderedDict()
enc['input'] = InputLayer((None, None), name='input')
enc_mask = enc['mask'] = InputLayer((None, None), name='mask')
enc_rev_mask = enc['rev_mask'] = InputLayer((None, None), name='rev_mask')
enc['input_emb'] = EmbeddingLayer(enc.values()[-1],
input_size=dim_word,
output_size=n_embd,
name='input_emb')
### ENCODER PART ###
# rnn encoder unit
hid_init = Constant(0.)
hid_init_rev = Constant(0.)
encoder_unit = get_rnn_unit(enc.values()[-1],
enc_mask,
enc_rev_mask,
hid_init,
hid_init_rev,
n_units,
prefix='encoder_')
enc.update(encoder_unit)
# context layer = decoder's initial state of shape (batch_size, num_units)
context = enc.values()[-1] # net['context']
if context_type == 'last':
enc['context2init'] = SliceLayer(context,
indices=-1,
axis=1,
name='last_encoder_context')
elif context_type == 'mean':
enc['context2init'] = ExpressionLayer(context,
mean_over_1_axis,
output_shape='auto',
name='mean_encoder_context')
### DECODER PART ###
W_init2proj, b_init2proj = GlorotUniform(), Constant(0.)
enc['init_state'] = DenseLayer(enc['context2init'],
num_units=n_units,
W=W_init2proj,
b=b_init2proj,
nonlinearity=tanh,
name='decoder_init_state')
if state is None:
init_state = enc['init_state']
init_state_rev = None #if rev_state is None else init_state
if not attention:
# if simple attetion the context is 2D, else 3D
context = enc['context2init']
else:
init_state = state
init_state_rev = rev_state
context = enc['context_input'] = \
InputLayer((None, n_units), name='ctx_input')
# (batch_size, nfeats)
# (batch_size, valid ntsteps)
enc['target'] = InputLayer((None, None), name='target')
dec_mask = enc['target_mask'] = InputLayer((None, None),
name='target_mask')
enc['target_emb'] = EmbeddingLayer(enc.values()[-1],
input_size=dim_word,
output_size=n_embd,
name='target_emb')
prevdim = n_embd
prev2rnn = enc.values()[-1] # it's either emb or prev2rnn/noise
decoder_unit = get_rnn_unit(prev2rnn,
dec_mask,
None,
init_state,
None,
n_units,
prefix='decoder_',
context=context,
attention=attention)
enc.update(decoder_unit)
if attention:
ctxs = enc.values()[-1]
ctxs_shape = ctxs.output_shape
def get_ctx(x):
return ctxs.ctx
context = enc['context'] = ExpressionLayer(ctxs,
function=get_ctx,
output_shape=ctxs_shape,
name='context')
# return all values'
# reshape for feed-forward layer
# 2D shapes of (batch_size * num_steps, num_units/num_feats)
enc['rnn2proj'] = rnn2proj = ReshapeLayer(enc.values()[-1], (-1, n_units),
name='flatten_rnn2proj')
enc['prev2proj'] = prev2proj = ReshapeLayer(prev2rnn, (-1, prevdim),
name='flatten_prev')
if isinstance(context, ExpressionLayer):
ctx2proj = enc['ctx2proj'] = ReshapeLayer(context,
(-1, ctxs_shape[-1]),
name='flatten_ctxs')
else:
ctx2proj = context
# load shared parameters
W_rnn2proj, b_rnn2proj = GlorotUniform(), Constant(0.)
W_prev2proj, b_prev2proj = GlorotUniform(), Constant(0.)
W_ctx2proj, b_ctx2proj = GlorotUniform(), Constant(0.)
# perturb rnn-to-projection by noise
if drop_p is not None:
rnn2proj = enc['noise_rnn2proj'] = DropoutLayer(rnn2proj,
sigma=drop_p,
name='noise_rnn2proj')
prev2proj = enc['drop_prev2proj'] = DropoutLayer(prev2proj,
sigma=drop_p,
name='drop_prev2proj')
ctx2proj = enc['noise_ctx2proj'] = DropoutLayer(ctx2proj,
sigma=drop_p,
name='noise_ctx2proj')
# project rnn
enc['rnn_proj'] = DenseLayer(rnn2proj,
num_units=n_proj,
nonlinearity=linear,
W=W_rnn2proj,
b=b_rnn2proj,
name='rnn_proj')
# project raw targets
enc['prev_proj'] = DenseLayer(prev2proj,
num_units=n_proj,
nonlinearity=linear,
W=W_prev2proj,
b=b_prev2proj,
name='prev_proj')
# project context
enc['ctx_proj'] = DenseLayer(ctx2proj,
num_units=n_proj,
nonlinearity=linear,
W=W_ctx2proj,
b=b_ctx2proj,
name='ctx_proj')
# reshape back for merging
n_batch = enc['input'].input_var.shape[0]
rnn2merge = enc['rnn2merge'] = ReshapeLayer(enc['rnn_proj'],
(n_batch, -1, n_proj),
name='reshaped_rnn2proj')
prev2merge = enc['prev2merge'] = ReshapeLayer(enc['prev_proj'],
(n_batch, -1, n_proj),
name='reshaped_prev')
if isinstance(context, ExpressionLayer):
ctx2merge = ReshapeLayer(enc['ctx_proj'], (n_batch, -1, n_proj),
name='reshaped_prev')
else:
ctx2merge = enc['ctx2merge'] = DimshuffleLayer(enc['ctx_proj'],
pattern=(0, 'x', 1),
name='reshaped_context')
# combine projections into shape (batch_size, n_steps, n_proj)
enc['proj_merge'] = ElemwiseMergeLayer([rnn2merge, prev2merge, ctx2merge],
merge_function=tanh_add,
name='proj_merge')
# reshape for output regression projection
enc['merge2proj'] = ReshapeLayer(enc.values()[-1], (-1, n_proj),
name='flatten_proj_merge')
# perturb concatenated regressors by noise
if drop_p is not None:
# if noise_type == 'binary':
enc['noise_output'] = DropoutLayer(enc.values()[-1],
p=drop_p,
name='noise_output')
# regress on combined (perturbed) projections
out = get_output_unit(enc['target'], enc.values()[-1], dim_word)
enc.update(out) # update graph
return enc
def conv_layer(incoming, num_filters):
tmp = Conv2DLayer(incoming, num_filters, 3, pad='valid')
tmp = BatchNormLayer(tmp)
if dropout:
tmp = DropoutLayer(tmp, 0.3)
return NonlinearityLayer(tmp)
def init_from_string(self, arch_string):
self.check_arch_string(arch_string)
self.set_output_dir(self.name)
self.input_layer = InputLayer(shape=(None,)+ self.input_shape, name='input')
net = self.input_layer
net = DropoutLayer(net, p=self.denoising)
# Encoder
self._layers = []
self.conv_layers = []
self.encode_layers = []
self.middle_pool_size = self.pixel_size
for layer_string in arch_string.split():
if layer_string.startswith("c"):
non_lin = layer_string[-1]
num_filter, filter_size = map(int,layer_string[1:-1].split("."))
net = Conv2DLayerFast(net, num_filters=num_filter, filter_size=filter_size, nonlinearity=act(non_lin), pad='same')
self.conv_layers.append(net)
elif layer_string.startswith("p"):
pool_size = int(layer_string[1])
net = MaxPool2DLayerFast(net, pool_size=(pool_size, pool_size))
self.middle_pool_size /= 2
elif layer_string.startswith("d"):
non_lin = layer_string[-1]
num_units, noise = map(int,layer_string[1:-1].split("."))
# net = DenseLayer(batch_norm(lasagne.layers.dropout(net, p=noise*0.1)), num_units=num_units, nonlinearity=act(non_lin))
net = DenseLayer(lasagne.layers.dropout(net, p=noise*0.1), num_units=num_units, nonlinearity=act(non_lin))
self.encode_layers.append(net)
self._layers.append(net)
# Decoder
for lyr in self._layers[::-1][:-1]:
if isinstance(lyr, (Conv2DLayerFast,)):
#net = Conv2DLayerFast(net, num_filters=lyr.input_layer.output_shape[1], filter_size=(lyr.filter_size, lyr.filter_size), nonlinearity=lyr.nonlinearity, pad='same' )
net = Conv2DLayerFast(net, num_filters=lyr.input_layer.output_shape[1], filter_size=lyr.filter_size, nonlinearity=lyr.nonlinearity, pad='same' )
elif isinstance(lyr, (MaxPool2DLayerFast,)):
if len(net.output_shape) == 2:
net = ReshapeLayer(net, shape=([0], lyr.input_layer.num_filters, self.middle_pool_size, self.middle_pool_size))
net = Upscale2DLayer(net, scale_factor=lyr.pool_size)
elif isinstance(lyr, (DenseLayer,)):
net = TransposedDenseLayer(net, num_units=numpy.prod(lyr.input_layer.input_shape[1:]), W=lyr.W, nonlinearity=lyr.nonlinearity)
lyr = self._layers[0]
if isinstance(lyr, (Conv2DLayerFast,)):
#net = Conv2DLayer(net, num_filters=self.n_channel, filter_size=(lyr.filter_size, lyr.filter_size), nonlinearity=lyr.nonlinearity, pad='same' )
net = Conv2DLayer(net, num_filters=self.n_channel, filter_size=lyr.filter_size, nonlinearity=lyr.nonlinearity, pad='same' )
elif isinstance(lyr, (MaxPool2DLayerFast,)):
channels = 1
if len(net.output_shape) == 2 and isinstance(lyr.input_layer, (Conv2DLayerFast, Conv2DLayer)):
channels = lyr.input_layer.num_filters
net = ReshapeLayer(net, shape=([0], channels, self.middle_pool_size, self.middle_pool_size))
net = Upscale2DLayer(net, scale_factor=lyr.pool_size)
elif isinstance(lyr, (DenseLayer,)):
net = TransposedDenseLayer(net, num_units=numpy.prod(lyr.input_layer.input_shape[1:]), W=lyr.W, nonlinearity=lyr.nonlinearity)
net = ReshapeLayer(net, name='output', shape=([0], -1))
pprint_layers(net)
self._nn = NeuralNet(net, verbose=self.verbose, regression=True, objective_loss_function=squared_error)
