def test_lnlstm_precompute():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
l_mask_inp = InputLayer(in_shp[:2])
x_in = np.random.random(in_shp).astype('float32')
mask_in = np.ones((num_batch, seq_len), dtype='float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_lstm_precompute = LNLSTMLayer(
l_inp, num_units=num_units, precompute_input=True,
mask_input=l_mask_inp)
lasagne.random.get_rng().seed(1234)
l_lstm_no_precompute = LNLSTMLayer(
l_inp, num_units=num_units, precompute_input=False,
mask_input=l_mask_inp)
output_precompute = helper.get_output(
l_lstm_precompute).eval({l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in})
output_no_precompute = helper.get_output(
l_lstm_no_precompute).eval({l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in})
# test that the backwards model reverses its final input
np.testing.assert_almost_equal(output_precompute, output_no_precompute)
def test_CustomRecurrentLayer_child_kwargs():
in_shape = (2, 3, 4)
n_hid = 5
# Construct mock for input-to-hidden layer
in_to_hid = Mock(Layer,
output_shape=(in_shape[0] * in_shape[1], n_hid),
input_shape=(in_shape[0] * in_shape[1], in_shape[2]),
input_layer=InputLayer(
(in_shape[0] * in_shape[1], in_shape[2])))
# These two functions get called, need to return dummy values for them
in_to_hid.get_output_for.return_value = T.matrix()
in_to_hid.get_params.return_value = []
# As above, for hidden-to-hidden layer
hid_to_hid = Mock(Layer,
output_shape=(in_shape[0], n_hid),
input_shape=(in_shape[0], n_hid),
input_layer=InputLayer((in_shape[0], n_hid)))
hid_to_hid.get_output_for.return_value = T.matrix()
hid_to_hid.get_params.return_value = []
# Construct a CustomRecurrentLayer using these Mocks
l_rec = lasagne.layers.CustomRecurrentLayer(InputLayer(in_shape),
in_to_hid, hid_to_hid)
# Call get_output with a kwarg, should be passd to in_to_hid and hid_to_hid
helper.get_output(l_rec, foo='bar')
# Retrieve the arguments used to call in_to_hid.get_output_for
args, kwargs = in_to_hid.get_output_for.call_args
# Should be one argument - the Theano expression
assert len(args) == 1
# One keywould argument - should be 'foo' -> 'bar'
assert kwargs == {'foo': 'bar'}
# Same as with in_to_hid
args, kwargs = hid_to_hid.get_output_for.call_args
assert len(args) == 1
assert kwargs == {'foo': 'bar'}
def test_recurrent_unroll_scan_fwd():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
l_mask_inp = InputLayer(in_shp[:2])
x_in = np.random.random(in_shp).astype('float32')
mask_in = np.ones(in_shp[:2]).astype('float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_rec_scan = RecurrentLayer(l_inp,
num_units=num_units,
backwards=False,
unroll_scan=False,
mask_input=l_mask_inp)
lasagne.random.get_rng().seed(1234)
l_rec_unroll = RecurrentLayer(l_inp,
num_units=num_units,
backwards=False,
unroll_scan=True,
mask_input=l_mask_inp)
output_scan = helper.get_output(l_rec_scan)
output_unrolled = helper.get_output(l_rec_unroll)
output_scan_val = output_scan.eval({
l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in
})
output_unrolled_val = output_unrolled.eval({
l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in
})
np.testing.assert_almost_equal(output_scan_val, output_unrolled_val)
def test_recurrent_precompute():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
l_mask_inp = InputLayer(in_shp[:2])
x_in = np.random.random(in_shp).astype('float32')
mask_in = np.ones((num_batch, seq_len), dtype='float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_rec_precompute = RecurrentLayer(l_inp,
num_units=num_units,
precompute_input=True,
mask_input=l_mask_inp)
lasagne.random.get_rng().seed(1234)
l_rec_no_precompute = RecurrentLayer(l_inp,
num_units=num_units,
precompute_input=False,
mask_input=l_mask_inp)
output_precompute = helper.get_output(l_rec_precompute).eval({
l_inp.input_var:
x_in,
l_mask_inp.input_var:
mask_in
})
output_no_precompute = helper.get_output(l_rec_no_precompute).eval({
l_inp.input_var:
x_in,
l_mask_inp.input_var:
mask_in
})
np.testing.assert_almost_equal(output_precompute, output_no_precompute)
def test_gru_unroll_scan_fwd():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
l_mask_inp = InputLayer(in_shp[:2])
x_in = np.random.random(in_shp).astype('float32')
mask_in = np.ones(in_shp[:2]).astype('float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_gru_scan = GRULayer(l_inp, num_units=num_units, backwards=False,
unroll_scan=False, mask_input=l_mask_inp)
lasagne.random.get_rng().seed(1234)
l_gru_unrolled = GRULayer(l_inp, num_units=num_units, backwards=False,
unroll_scan=True, mask_input=l_mask_inp)
output_scan = helper.get_output(l_gru_scan)
output_unrolled = helper.get_output(l_gru_unrolled)
output_scan_val = output_scan.eval({l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in})
output_unrolled_val = output_unrolled.eval({l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in})
np.testing.assert_almost_equal(output_scan_val, output_unrolled_val)
def test_gru_unroll_scan_bck():
num_batch, seq_len, n_features1 = 2, 5, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.random.random(in_shp).astype('float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_gru_scan = GRULayer(l_inp,
num_units=num_units,
backwards=True,
unroll_scan=False)
lasagne.random.get_rng().seed(1234)
l_gru_unrolled = GRULayer(l_inp,
num_units=num_units,
backwards=True,
unroll_scan=True)
output_scan = helper.get_output(l_gru_scan, x)
output_unrolled = helper.get_output(l_gru_unrolled, x)
output_scan_val = output_scan.eval({x: x_in})
output_unrolled_val = output_unrolled.eval({x: x_in})
np.testing.assert_almost_equal(output_scan_val, output_unrolled_val)
def test_gru_precompute():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
l_mask_inp = InputLayer(in_shp[:2])
x_in = np.random.random(in_shp).astype('float32')
mask_in = np.ones((num_batch, seq_len), dtype='float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_gru_precompute = GRULayer(l_inp, num_units=num_units,
precompute_input=True, mask_input=l_mask_inp)
lasagne.random.get_rng().seed(1234)
l_gru_no_precompute = GRULayer(l_inp, num_units=num_units,
precompute_input=False,
mask_input=l_mask_inp)
output_precompute = helper.get_output(
l_gru_precompute).eval({l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in})
output_no_precompute = helper.get_output(
l_gru_no_precompute).eval({l_inp.input_var: x_in,
l_mask_inp.input_var: mask_in})
# test that the backwards model reverses its final input
np.testing.assert_almost_equal(output_precompute, output_no_precompute)
def step(input_n, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_pre = helper.get_output(self.hidden_to_hidden, hid_previous,
**kwargs)
# out_layers = helper.get_all_layers(self.output_to_hidden)
# out_layers[1].incoming_layer = self.hidden_to_hidden
hid_pre += helper.get_output(self.output_to_hidden, hid_previous,
**kwargs)
# If the dot product is precomputed then add it, otherwise
# calculate the input_to_hidden values and add them
if self.precompute_input:
hid_pre += input_n
else:
hid_pre += helper.get_output(self.input_to_hidden, input_n,
**kwargs)
# Clip gradients
if self.grad_clipping:
hid_pre = theano.gradient.grad_clip(hid_pre,
-self.grad_clipping,
self.grad_clipping)
return self.nonlinearity(hid_pre)
def test_CustomRecurrentLayer_child_kwargs():
in_shape = (2, 3, 4)
n_hid = 5
# Construct mock for input-to-hidden layer
in_to_hid = Mock(
Layer,
output_shape=(in_shape[0]*in_shape[1], n_hid),
input_shape=(in_shape[0]*in_shape[1], in_shape[2]),
input_layer=InputLayer((in_shape[0]*in_shape[1], in_shape[2])))
# These two functions get called, need to return dummy values for them
in_to_hid.get_output_for.return_value = T.matrix()
in_to_hid.get_params.return_value = []
# As above, for hidden-to-hidden layer
hid_to_hid = Mock(
Layer,
output_shape=(in_shape[0], n_hid),
input_shape=(in_shape[0], n_hid),
input_layer=InputLayer((in_shape[0], n_hid)))
hid_to_hid.get_output_for.return_value = T.matrix()
hid_to_hid.get_params.return_value = []
# Construct a CustomRecurrentLayer using these Mocks
l_rec = lasagne.layers.CustomRecurrentLayer(
InputLayer(in_shape), in_to_hid, hid_to_hid)
# Call get_output with a kwarg, should be passd to in_to_hid and hid_to_hid
helper.get_output(l_rec, foo='bar')
# Retrieve the arguments used to call in_to_hid.get_output_for
args, kwargs = in_to_hid.get_output_for.call_args
# Should be one argument - the Theano expression
assert len(args) == 1
# One keywould argument - should be 'foo' -> 'bar'
assert kwargs == {'foo': 'bar'}
# Same as with in_to_hid
args, kwargs = hid_to_hid.get_output_for.call_args
assert len(args) == 1
assert kwargs == {'foo': 'bar'}
def test_get_output_with_unused_kwarg(self, layers, get_output):
l1, l2, l3 = layers
unused_kwarg = object()
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
get_output(l3, kwagg=unused_kwarg)
assert len(w) == 1
assert issubclass(w[0].category, UserWarning)
assert 'perhaps you meant kwarg' in str(w[0].message)
def test_get_output_with_unused_kwarg(self, layers, get_output):
l1, l2, l3 = layers
unused_kwarg = object()
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
get_output(l3, kwagg=unused_kwarg)
assert len(w) == 1
assert issubclass(w[0].category, UserWarning)
assert 'perhaps you meant kwarg' in str(w[0].message)
def test_layer_from_shape_valid_get_output(self, layer_from_shape,
get_output):
layer = layer_from_shape
inputs = {layer: theano.tensor.matrix()}
assert get_output(layer, inputs) is inputs[layer]
inputs = {None: theano.tensor.matrix()}
layer.get_output_for = Mock()
assert get_output(layer, inputs) is layer.get_output_for.return_value
layer.get_output_for.assert_called_with(inputs[None])
def test_layer_from_shape_valid_get_output(self, layer_from_shape,
get_output):
layer = layer_from_shape
inputs = {layer: theano.tensor.matrix()}
assert get_output(layer, inputs) is inputs[layer]
inputs = {None: theano.tensor.matrix()}
layer.get_output_for = Mock()
assert get_output(layer, inputs) is layer.get_output_for.return_value
layer.get_output_for.assert_called_with(inputs[None])
def step(input_n, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_pre = helper.get_output(
self.hidden_to_hidden, hid_previous, **kwargs)
hid_pre = T.concatenate([hid_pre, input_n], axis=1)
hid_pre = helper.get_output(self.post_concat, hid_pre, **kwargs)
if self.grad_clipping:
hid_pre = theano.gradient.grad_clip(
hid_pre, -self.grad_clipping, self.grad_clipping)
return hid_pre
def step(input_n, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_pre = helper.get_output(self.hidden_to_hidden, hid_previous,
**kwargs)
hid_pre = T.concatenate([hid_pre, input_n], axis=1)
hid_pre = helper.get_output(self.post_concat, hid_pre, **kwargs)
if self.grad_clipping:
hid_pre = theano.gradient.grad_clip(hid_pre,
-self.grad_clipping,
self.grad_clipping)
return hid_pre
def test_get_output_input_is_a_mapping_no_key(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3, {})
# expected: l3.get_output_for(l2.get_output_for(l1.input_var))
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with(l2.get_output_for.return_value)
l2.get_output_for.assert_called_with(l1.input_var)
def test_lstm_grad(num_units):
num_batch, seq_len, n_features = 5, 3, 10
l_inp = InputLayer((num_batch, seq_len, n_features))
l_lstm = LSTMLayer(l_inp, num_units=num_units)
output = helper.get_output(l_lstm)
g = T.grad(T.mean(output), lasagne.layers.get_all_params(l_lstm))
assert isinstance(g, (list, tuple))
def get_output_for(self, inputs, **kwargs):
input = inputs[0]
hid_init = None
if self.hid_init_incoming_index > 0:
hid_init = inputs[self.hid_init_incoming_index]
# Input should be provided as (n_batch, n_time_steps, n_features)
# but scan requires the iterable dimension to be first
# So, we need to dimshuffle to (n_time_steps, n_batch, n_features)
input = input.dimshuffle(1, 0, *range(2, input.ndim))
seq_len, num_batch = input.shape[0], input.shape[1]
# precompute inputs before scanning
trailing_dims = tuple(input.shape[n] for n in range(2, input.ndim))
input = T.reshape(input, (seq_len * num_batch, ) + trailing_dims)
input = helper.get_output(self.input_to_hidden, input, **kwargs)
# Reshape back to (seq_len, batch_size, trailing dimensions...)
trailing_dims = tuple(input.shape[n] for n in range(1, input.ndim))
input = T.reshape(input, (seq_len, num_batch) + trailing_dims)
# pass params to step
non_seqs = helper.get_all_params(self.hidden_to_hidden)
non_seqs += helper.get_all_params(self.post_concat)
# Create single recurrent computation step function
def step(input_n, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_pre = helper.get_output(self.hidden_to_hidden, hid_previous,
**kwargs)
hid_pre = T.concatenate([hid_pre, input_n], axis=1)
hid_pre = helper.get_output(self.post_concat, hid_pre, **kwargs)
if self.grad_clipping:
hid_pre = theano.gradient.grad_clip(hid_pre,
-self.grad_clipping,
self.grad_clipping)
return hid_pre
sequences = input
step_fun = step
if not isinstance(self.hid_init, Layer):
# repeats self.hid_init num_batch times in first dimension
dot_dims = (list(range(1, self.hid_init.ndim - 1)) +
[0, self.hid_init.ndim - 1])
hid_init = T.dot(T.ones((num_batch, 1)),
self.hid_init.dimshuffle(dot_dims))
hid_out = theano.scan(fn=step_fun,
sequences=sequences,
go_backwards=False,
outputs_info=[hid_init],
non_sequences=non_seqs,
truncate_gradient=-1,
strict=True)[0]
# dimshuffle back to (n_batch, n_time_steps, n_features))
hid_out = hid_out.dimshuffle(1, 0, *range(2, hid_out.ndim))
return hid_out
def test_get_output_without_arguments(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3)
# expected: l3.get_output_for(l2.get_output_for(l1.input_var))
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with(l2.get_output_for.return_value)
l2.get_output_for.assert_called_with(l1.input_var)
def test_embedding_2D_input():
import numpy as np
import theano
import theano.tensor as T
from lasagne.layers import EmbeddingLayer, InputLayer, helper
x = T.imatrix()
batch_size = 2
seq_len = 3
emb_size = 5
vocab_size = 3
l_in = InputLayer((None, seq_len))
W = np.arange(
vocab_size*emb_size).reshape((vocab_size, emb_size)).astype('float32')
l1 = EmbeddingLayer(l_in, input_size=vocab_size, output_size=emb_size,
W=W)
x_test = np.array([[0, 1, 2], [0, 0, 2]], dtype='int32')
# check output shape
assert helper.get_output_shape(
l1, (batch_size, seq_len)) == (batch_size, seq_len, emb_size)
output = helper.get_output(l1, x)
f = theano.function([x], output)
np.testing.assert_array_almost_equal(f(x_test), W[x_test])
def test_lstm_grad(num_units):
num_batch, seq_len, n_features = 5, 3, 10
l_inp = InputLayer((num_batch, seq_len, n_features))
l_lstm = LSTMLayer(l_inp, num_units=num_units)
output = helper.get_output(l_lstm)
g = T.grad(T.mean(output), lasagne.layers.get_all_params(l_lstm))
assert isinstance(g, (list, tuple))
def get_functions():
input_layer=layers.InputLayer(shape=(BATCH_SIZE, INPUT_LENGTH))
print "input_layer size: " + str(input_layer.shape[0])+","+ str(input_layer.shape[1])
layer = input_layer
for layer_num in range(len(NUM_UNITS_HIDDEN_LAYER)):
print "layer_num-"+str(layer_num)
layer=layers.DenseLayer(layer,
num_units=NUM_UNITS_HIDDEN_LAYER[layer_num],
W=lasagne.init.Normal(0.01),
nonlinearity=nonlinearities.tanh)
output_layer=layers.DenseLayer(layer,
num_units=OUTPUT_SIZE,
nonlinearity=nonlinearities.softmax)
network_output=get_output(output_layer)
expected_output=T.ivector()
loss_train=aggregate(categorical_crossentropy(network_output, expected_output), mode='mean')
all_weigths=layers.get_all_params(output_layer)
update_rule=lasagne.updates.nesterov_momentum(loss_train, all_weigths, learning_rate=LEARNING_RATE)
print "input_layer_end size: " + str(input_layer.shape[0])+","+ str(input_layer.shape[1])
train_function=theano.function(inputs=[input_layer.input_var, expected_output],
outputs=loss_train,
updates=update_rule,
allow_input_downcast=True)
prediction = T.argmax(network_output, axis=1)
accuracy = T.mean(T.eq(prediction, expected_output), dtype=theano.config.floatX) # @UndefinedVariable
test_function=theano.function(inputs=[input_layer.input_var, expected_output],
outputs=[loss_train, accuracy, prediction],
allow_input_downcast=True)
output_function=theano.function([input_layer.input_var],get_output(output_layer),
allow_input_downcast=True)
return train_function,test_function,output_function
def test_recurrent_grad():
num_batch, seq_len, n_features = 5, 3, 10
num_units = 6
l_inp = InputLayer((num_batch, seq_len, n_features))
l_rec = RecurrentLayer(l_inp, num_units=num_units)
output = helper.get_output(l_rec)
g = T.grad(T.mean(output), lasagne.layers.get_all_params(l_rec))
assert isinstance(g, (list, tuple))
def test_recurrent_grad():
num_batch, seq_len, n_features = 5, 3, 10
num_units = 6
l_inp = InputLayer((num_batch, seq_len, n_features))
l_rec = RecurrentLayer(l_inp,
num_units=num_units)
output = helper.get_output(l_rec)
g = T.grad(T.mean(output), lasagne.layers.get_all_params(l_rec))
assert isinstance(g, (list, tuple))
def test_lstm_return_final():
num_batch, seq_len, n_features = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features)
x_in = np.random.random(in_shp).astype('float32')
l_inp = InputLayer(in_shp)
lasagne.random.get_rng().seed(1234)
l_rec_final = LSTMLayer(l_inp, num_units, only_return_final=True)
lasagne.random.get_rng().seed(1234)
l_rec_all = LSTMLayer(l_inp, num_units, only_return_final=False)
output_final = helper.get_output(l_rec_final).eval({l_inp.input_var: x_in})
output_all = helper.get_output(l_rec_all).eval({l_inp.input_var: x_in})
assert output_final.shape == (output_all.shape[0], output_all.shape[2])
assert output_final.shape == lasagne.layers.get_output_shape(l_rec_final)
assert np.allclose(output_final, output_all[:, -1])
def test_tuple_shape(self, func, input_layer, ExpressionLayer):
from lasagne.layers.helper import get_output
X, expected = self.np_result(func, input_layer)
layer = ExpressionLayer(input_layer, func, output_shape=expected.shape)
assert layer.get_output_shape_for(X.shape) == expected.shape
output = get_output(layer, X).eval()
assert np.allclose(output, expected)
def test_get_output_without_arguments(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3)
# expected: l3.get_output_for(l2.get_output_for(l1.input_var))
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with(
l2.get_output_for.return_value)
l2.get_output_for.assert_called_with(
l1.input_var)
def test_get_output_input_is_a_mapping_no_key(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3, {})
# expected: l3.get_output_for(l2.get_output_for(l1.input_var))
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with(
l2.get_output_for.return_value)
l2.get_output_for.assert_called_with(
l1.input_var)
def test_tuple_shape(self, func, input_layer, ExpressionLayer):
from lasagne.layers.helper import get_output
X, expected = self.np_result(func, input_layer)
layer = ExpressionLayer(input_layer, func, output_shape=expected.shape)
assert layer.get_output_shape_for(X.shape) == expected.shape
output = get_output(layer, X).eval()
assert np.allclose(output, expected)
def test_gru_return_final():
num_batch, seq_len, n_features = 2, 3, 4
num_units = 2
in_shp = (num_batch, seq_len, n_features)
x_in = np.random.random(in_shp).astype('float32')
l_inp = InputLayer(in_shp)
lasagne.random.get_rng().seed(1234)
l_rec_final = GRULayer(l_inp, num_units, only_return_final=True)
lasagne.random.get_rng().seed(1234)
l_rec_all = GRULayer(l_inp, num_units, only_return_final=False)
output_final = helper.get_output(l_rec_final).eval({l_inp.input_var: x_in})
output_all = helper.get_output(l_rec_all).eval({l_inp.input_var: x_in})
assert output_final.shape == (output_all.shape[0], output_all.shape[2])
assert output_final.shape == lasagne.layers.get_output_shape(l_rec_final)
assert np.allclose(output_final, output_all[:, -1])
def test_cifar_deterministic(cls, **kwargs):
model = cls.cifar_model(**kwargs)
data = floatX(numpy.random.normal(0.0, 1.0, (64, 3, 32, 32)))
input_var = tensor.tensor4('inputs')
activation = get_output(model, input_var, deterministic=True)
func = function([input_var], activation)
output = func(data)
del output
def test_lstm_grad():
num_batch, seq_len, n_features = 5, 3, 10
num_units = 6
x = T.tensor3()
mask = T.matrix()
l_inp = InputLayer((num_batch, seq_len, n_features))
l_lstm = LSTMLayer(l_inp, num_units=num_units)
l_out = helper.get_output(l_lstm, x, mask=mask)
g = T.grad(T.mean(l_out), lasagne.layers.get_all_params(l_lstm))
assert isinstance(g, (list, tuple))
def test_recurrent_unroll_scan_bck():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.random.random(in_shp).astype("float32")
# need to set random seed.
np.random.seed(1234)
l_rec_scan = RecurrentLayer(l_inp, num_units=num_units, backwards=True, unroll_scan=False)
np.random.seed(1234)
l_rec_unroll = RecurrentLayer(l_inp, num_units=num_units, backwards=True, unroll_scan=True)
output_scan = helper.get_output(l_rec_scan, x)
output_unrolled = helper.get_output(l_rec_unroll, x)
output_scan_val = output_scan.eval({x: x_in})
output_unrolled_val = output_unrolled.eval({x: x_in})
np.testing.assert_almost_equal(output_scan_val, output_unrolled_val)
def step(input_n, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_pre = helper.get_output(
self.hidden_to_hidden, hid_previous, **kwargs)
# If the dot product is precomputed then add it, otherwise
# calculate the input_to_hidden values and add them
if self.precompute_input:
hid_pre += input_n
else:
hid_pre += helper.get_output(
self.input_to_hidden, input_n, **kwargs)
# Clip gradients
if self.grad_clipping:
hid_pre = theano.gradient.grad_clip(
hid_pre, -self.grad_clipping, self.grad_clipping)
return self.nonlinearity(hid_pre)
def test_get_output_with_single_argument(self, layers, get_output):
l1, l2, l3 = layers
inputs, kwarg = theano.tensor.matrix(), object()
output = get_output(l3, inputs, kwarg=kwarg)
# expected: l3.get_output_for(l2.get_output_for(inputs, kwarg=kwarg),
# kwarg=kwarg)
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with(l2.get_output_for.return_value,
kwarg=kwarg)
l2.get_output_for.assert_called_with(inputs, kwarg=kwarg)
def step(input_n, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_to_hid = helper.get_output(self.hidden_to_hidden, hid_previous,
**kwargs)
# Compute the input-to-hidden activation
if self.precompute_input:
# if the input is precomputed
in_to_hid = input_n
else:
# compute the input
in_to_hid = helper.get_output(self.input_to_hidden, input_n,
**kwargs)
# Compute the second order term
if self.a_g is not None:
second_order_term = (self.a_g * in_to_hid * hid_to_hid)
# second_order_term = in_to_hid * hid_to_hid
else:
second_order_term = 0
# Compute the first order hidden-to-hidden term
if self.b_g_hid_to_hid is not None:
f_o_hid_to_hid = self.b_g_hid_to_hid * hid_to_hid
else:
f_o_hid_to_hid = 0
# Compute first order input to hidden term
if self.b_g_in_to_hid is not None:
f_o_in_to_hid = self.b_g_in_to_hid * in_to_hid
else:
# if all else is None, it will output zeros of the right size
f_o_in_to_hid = T.zeros_like(in_to_hid)
hid_pre = second_order_term + f_o_in_to_hid + f_o_hid_to_hid
if self.b is not None:
hid_pre = hid_pre + self.b
return self.nonlinearity(hid_pre)
def step(input_n, hid_prevprev, hid_previous, *args):
# Compute the hidden-to-hidden activation
hid_pre = helper.get_output(self.hidden_to_hidden, hid_previous, **kwargs)
# If the dot product is precomputed then add it, otherwise
# calculate the input_to_hidden values and add them
if self.precompute_input:
hid_pre += input_n
else:
hid_pre += helper.get_output(
self.input_to_hidden, input_n, **kwargs)
# Clip gradients
if self.grad_clipping:
hid_pre = theano.gradient.grad_clip(hid_pre, -self.grad_clipping, self.grad_clipping)
hid_pre += self.gamma * hid_prevprev * T.clip(T.tile(T.reshape(T.diagonal(T.dot(hid_prevprev, hid_previous.T)),
(1,hid_previous.shape[0])), (hid_previous.shape[1],1)).T, 0.0, 100.0)
return self.nonlinearity( hid_pre )
def test_get_output_with_single_argument(self, layers, get_output):
l1, l2, l3 = layers
inputs, kwarg = theano.tensor.matrix(), object()
output = get_output(l3, inputs, kwarg=kwarg)
# expected: l3.get_output_for(l2.get_output_for(inputs, kwarg=kwarg),
# kwarg=kwarg)
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with(
l2.get_output_for.return_value, kwarg=kwarg)
l2.get_output_for.assert_called_with(
inputs, kwarg=kwarg)
def test_recurrent_precompute():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
x = T.tensor3()
mask = T.matrix()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.random.random(in_shp).astype("float32")
mask_in = np.ones((num_batch, seq_len), dtype="float32")
# need to set random seed.
np.random.seed(1234)
l_rec_precompute = RecurrentLayer(l_inp, num_units=num_units, precompute_input=True)
np.random.seed(1234)
l_rec_no_precompute = RecurrentLayer(l_inp, num_units=num_units, precompute_input=False)
output_precompute = helper.get_output(l_rec_precompute, x, mask=mask).eval({x: x_in, mask: mask_in})
output_no_precompute = helper.get_output(l_rec_no_precompute, x, mask=mask).eval({x: x_in, mask: mask_in})
np.testing.assert_almost_equal(output_precompute, output_no_precompute)
def get_output_for(self, input, **kwargs): rs = input.reshape((input.shape[0], input.shape[1], input.shape[2], 1)) # B,V,S,1 z1 = T.tile( rs, (1,1,1,input.shape[2])) z2 = z1.transpose((0,1,3,2)) Z = T.concatenate([z1,z2],axis=1) Y = helper.get_output(self.subnet, Z) if self.pooling == 'mean': return T.mean(Y,axis=3) elif self.pooling == 'max': return T.max(Y,axis=3) else: return self.pooling(Y)
def test_get_output_input_is_a_mapping(self, layers, get_output):
l1, l2, l3 = layers
p = PropertyMock()
type(l1).input_var = p
inputs = {l3: theano.tensor.matrix()}
# expected: inputs[l3]
assert get_output(l3, inputs) is inputs[l3]
# l3.get_output_for, l2.get_output_for should not have been called
assert l3.get_output_for.call_count == 0
assert l2.get_output_for.call_count == 0
# l1.input_var should not have been accessed
assert p.call_count == 0
def test_get_output_input_is_a_mapping(self, layers, get_output):
l1, l2, l3 = layers
p = PropertyMock()
type(l1).input_var = p
inputs = {l3: theano.tensor.matrix()}
# expected: inputs[l3]
assert get_output(l3, inputs) is inputs[l3]
# l3.get_output_for, l2.get_output_for should not have been called
assert l3.get_output_for.call_count == 0
assert l2.get_output_for.call_count == 0
# l1.input_var should not have been accessed
assert p.call_count == 0
def test_get_output_without_arguments(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3)
# expected: l3.get_output_for([l2[0].get_output_for(l1[0].input_var),
# l2[1].get_output_for(l1[1].input_var)])
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with([
l2[0].get_output_for.return_value,
l2[1].get_output_for.return_value,
])
l2[0].get_output_for.assert_called_with(l1[0].input_var)
l2[1].get_output_for.assert_called_with(l1[1].input_var)
def test_get_output_input_is_a_mapping_no_key(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3, {})
# expected: l3.get_output_for([l2[0].get_output_for(l1[0].input_var),
# l2[1].get_output_for(l1[1].input_var)])
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with([
l2[0].get_output_for.return_value,
l2[1].get_output_for.return_value,
])
l2[0].get_output_for.assert_called_with(l1[0].input_var)
l2[1].get_output_for.assert_called_with(l1[1].input_var)
def test_lstm_bck():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.ones(in_shp).astype('float32')
# need to set random seed.
np.random.seed(1234)
l_lstm_fwd = LSTMLayer(l_inp, num_units=num_units, backwards=False)
np.random.seed(1234)
l_lstm_bck = LSTMLayer(l_inp, num_units=num_units, backwards=True)
l_out_fwd = helper.get_output(l_lstm_fwd, x)
l_out_bck = helper.get_output(l_lstm_bck, x)
f_lstm = theano.function([x], [l_out_fwd, l_out_bck])
f_out_fwd, f_out_bck = f_lstm(x_in)
# test that the backwards model reverses its final input
np.testing.assert_almost_equal(f_out_fwd, f_out_bck[:, ::-1])
def test_callable_shape(self, func, input_layer, ExpressionLayer):
from lasagne.layers.helper import get_output
X, expected = self.np_result(func, input_layer)
def get_shape(input_shape):
return func(np.empty(shape=input_shape)).shape
layer = ExpressionLayer(input_layer, func, output_shape=get_shape)
assert layer.get_output_shape_for(X.shape) == expected.shape
output = get_output(layer, X).eval()
assert np.allclose(output, expected)
def test_get_output_input_is_a_mapping_to_array(self, layers, get_output):
l1, l2, l3 = layers
p = PropertyMock()
type(l1).input_var = p
inputs = {l3: [[1, 2, 3]]}
output = get_output(l3, inputs)
# expected: inputs[l3]
assert numpy.all(output.eval() == inputs[l3])
# l3.get_output_for, l2.get_output_for should not have been called
assert l3.get_output_for.call_count == 0
assert l2.get_output_for.call_count == 0
# l1.input_var should not have been accessed
assert p.call_count == 0
def test_gru_unroll_scan_bck():
num_batch, seq_len, n_features1 = 2, 5, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.random.random(in_shp).astype('float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_gru_scan = GRULayer(l_inp, num_units=num_units, backwards=True,
unroll_scan=False)
lasagne.random.get_rng().seed(1234)
l_gru_unrolled = GRULayer(l_inp, num_units=num_units, backwards=True,
unroll_scan=True)
output_scan = helper.get_output(l_gru_scan, x)
output_unrolled = helper.get_output(l_gru_unrolled, x)
output_scan_val = output_scan.eval({x: x_in})
output_unrolled_val = output_unrolled.eval({x: x_in})
np.testing.assert_almost_equal(output_scan_val, output_unrolled_val)
def test(precompute, order, learn_init, unroll_scan):
in_l1 = L.InputLayer((5, 3, 12), name="input")
in_l2 = L.InputLayer((5, 3, 13), name="input")
n_in = 6 if order == "TND" else 10
step_l = L.RENStep((n_in, 25), 10, 25, name="cell",
pre_compute_input=precompute, learn_init=learn_init)
rec_l = L.RNNLayer((in_l1, in_l2), step_l, name="rec", in_order=order, unroll_scan=unroll_scan)
r1 = theano.shared(np.random.randn(5, 3, 12).astype(theano.config.floatX))
r2 = theano.shared(np.random.randn(5, 3, 13).astype(theano.config.floatX))
out = h.get_output(rec_l, inputs={in_l1: r1, in_l2: r2}).eval()
print("Predicted:", h.get_output_shape(rec_l))
print("Actual: ", out.shape)
print("Min-max [{:.3f}, {:.3f}]".format(np.min(out), np.max(out)))
def test_gru_bck():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.ones(in_shp).astype('float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_gru_fwd = GRULayer(l_inp, num_units=num_units, backwards=False)
lasagne.random.get_rng().seed(1234)
l_gru_bck = GRULayer(l_inp, num_units=num_units, backwards=True)
output_fwd = helper.get_output(l_gru_fwd, x)
output_bck = helper.get_output(l_gru_bck, x)
output_fwd_val = output_fwd.eval({x: x_in})
output_bck_val = output_bck.eval({x: x_in})
# test that the backwards model reverses its final input
np.testing.assert_almost_equal(output_fwd_val, output_bck_val[:, ::-1])
def test_callable_shape(self, func, input_layer, ExpressionLayer):
from lasagne.layers.helper import get_output
X, expected = self.np_result(func, input_layer)
def get_shape(input_shape):
return func(np.empty(shape=input_shape)).shape
layer = ExpressionLayer(input_layer, func, output_shape=get_shape)
assert layer.get_output_shape_for(X.shape) == expected.shape
output = get_output(layer, X).eval()
assert np.allclose(output, expected)
def test_get_output_for(self, invlayer_vars):
from lasagne.layers.helper import get_output
invlayer = invlayer_vars['invlayer']
layer = invlayer_vars['layer']
W = layer.W.get_value()
input = theano.shared(np.random.rand(*layer.input_shape))
results = get_output(invlayer, inputs=input)
# Check that the output of the invlayer is the output of the
# dot product of the output of the dense layer and the
# transposed weights
assert np.allclose(results.eval(),
np.dot(np.dot(input.get_value(), W), W.T))
def test_get_output_input_is_a_mapping_to_array(self, layers, get_output):
l1, l2, l3 = layers
p = PropertyMock()
type(l1).input_var = p
inputs = {l3: [[1, 2, 3]]}
output = get_output(l3, inputs)
# expected: inputs[l3]
assert numpy.all(output.eval() == inputs[l3])
# l3.get_output_for, l2.get_output_for should not have been called
assert l3.get_output_for.call_count == 0
assert l2.get_output_for.call_count == 0
# l1.input_var should not have been accessed
assert p.call_count == 0
def test_recurrent_bck():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.ones(in_shp).astype("float32")
# need to set random seed.
np.random.seed(1234)
l_rec_fwd = RecurrentLayer(l_inp, num_units=num_units, backwards=False)
np.random.seed(1234)
l_rec_bck = RecurrentLayer(l_inp, num_units=num_units, backwards=True)
l_out_fwd = helper.get_output(l_rec_fwd, x)
l_out_bck = helper.get_output(l_rec_bck, x)
output_fwd = l_out_fwd.eval({l_out_fwd: x_in})
output_bck = l_out_bck.eval({l_out_bck: x_in})
# test that the backwards model reverses its final input
np.testing.assert_almost_equal(output_fwd, output_bck[:, ::-1])
def test_gru_bck():
num_batch, seq_len, n_features1 = 2, 3, 4
num_units = 2
x = T.tensor3()
in_shp = (num_batch, seq_len, n_features1)
l_inp = InputLayer(in_shp)
x_in = np.ones(in_shp).astype('float32')
# need to set random seed.
lasagne.random.get_rng().seed(1234)
l_gru_fwd = GRULayer(l_inp, num_units=num_units, backwards=False)
lasagne.random.get_rng().seed(1234)
l_gru_bck = GRULayer(l_inp, num_units=num_units, backwards=True)
output_fwd = helper.get_output(l_gru_fwd, x)
output_bck = helper.get_output(l_gru_bck, x)
output_fwd_val = output_fwd.eval({x: x_in})
output_bck_val = output_bck.eval({x: x_in})
# test that the backwards model reverses its final input
np.testing.assert_almost_equal(output_fwd_val, output_bck_val[:, ::-1])
def test_get_output_input_is_a_mapping_no_key(self, layers, get_output):
l1, l2, l3 = layers
output = get_output(l3, {})
# expected: l3.get_output_for([l2[0].get_output_for(l1[0].input_var),
# l2[1].get_output_for(l1[1].input_var)])
assert output is l3.get_output_for.return_value
l3.get_output_for.assert_called_with([
l2[0].get_output_for.return_value,
l2[1].get_output_for.return_value,
])
l2[0].get_output_for.assert_called_with(
l1[0].input_var)
l2[1].get_output_for.assert_called_with(
l1[1].input_var)
def test_get_output_for(self, invlayer_vars):
from lasagne.layers.helper import get_output
invlayer = invlayer_vars['invlayer']
layer = invlayer_vars['layer']
W = layer.W.get_value()
input = theano.shared(
np.random.rand(*layer.input_shape))
results = get_output(invlayer, inputs=input)
# Check that the output of the invlayer is the output of the
# dot product of the output of the dense layer and the
# transposed weights
assert np.allclose(
results.eval(), np.dot(np.dot(input.get_value(), W), W.T))
def test_lstm_variable_input_size():
# that seqlen and batchsize None works
num_batch, n_features1 = 6, 5
num_units = 13
x = T.tensor3()
in_shp = (None, None, n_features1)
l_inp = InputLayer(in_shp)
x_in1 = np.ones((num_batch+1, 3+1, n_features1)).astype('float32')
x_in2 = np.ones((num_batch, 3, n_features1)).astype('float32')
l_rec = LSTMLayer(l_inp, num_units=num_units, backwards=False)
output = helper.get_output(l_rec, x)
output_val1 = output.eval({x: x_in1})
output_val2 = output.eval({x: x_in2})
def test_gru_return_shape():
num_batch, seq_len, n_features1, n_features2 = 5, 3, 10, 11
num_units = 6
x = T.tensor4()
in_shp = (num_batch, seq_len, n_features1, n_features2)
l_inp = InputLayer(in_shp)
l_rec = GRULayer(l_inp, num_units=num_units)
x_in = np.random.random(in_shp).astype('float32')
output = helper.get_output(l_rec, x)
output_val = output.eval({x: x_in})
assert helper.get_output_shape(l_rec, x_in.shape) == output_val.shape
assert output_val.shape == (num_batch, seq_len, num_units)
