def seqcla():
# LSTM params
input_dim = 50
output_dim = 128
cell_dim = 128
# model
num_labels = 5
vocab = 2000
embed_dim = 50
t = C.dynamic_axis(name='t')
features = C.sparse_input(vocab, dynamic_axis=t, name='features')
labels = C.input(num_labels, name='labels')
train_reader = C.CNTKTextFormatReader(train_file)
# setup embedding matrix
embedding = C.parameter((embed_dim, vocab), learning_rate_multiplier=0.0,
init_from_file_path=embedding_file)
# get the vector representing the word
sequence = C.times(embedding, features, name='sequence')
# add an LSTM layer
L = lstm_layer(output_dim, cell_dim, sequence, input_dim)
# add a softmax layer on top
w = C.parameter((num_labels, output_dim), name='w')
b = C.parameter((num_labels), name='b')
z = C.times(w, L) + b
z.name='z'
z.tag = "output"
# and reconcile the shared dynamic axis
pred = C.reconcile_dynamic_axis(z, labels, name='pred')
ce = C.cross_entropy_with_softmax(labels, pred)
ce.tag = "criterion"
my_sgd = C.SGDParams(epoch_size=0, minibatch_size=10, learning_rates_per_mb=0.1, max_epochs=3)
with C.LocalExecutionContext('seqcla') as ctx:
# train the model
ctx.train(root_nodes=[ce], training_params=my_sgd, input_map=train_reader.map(
features, alias='x', dim=vocab, format='Sparse').map(
labels, alias='y', dim=num_labels, format='Dense'))
# write out the predictions
ctx.write(input_map=train_reader.map(
features, alias='x', dim=vocab, format='Sparse').map(
labels, alias='y', dim=num_labels, format='Dense'))
# do some manual accuracy testing
acc = calc_accuracy(train_file, ctx.output_filename_base)
# and test for the same number...
TOLERANCE_ABSOLUTE = 1E-02
assert np.allclose(acc, 0.6006415396952687, atol=TOLERANCE_ABSOLUTE)
def test_op_times_reduce_sequence_axis(device_id, precision):
dt_precision = PRECISION_TO_TYPE[precision]
from cntk import times, Value, TIMES_REDUCE_SEQUENCE_AXIS_WITHOUT_INFERRED_INPUT_RANK
from cntk import sequence
dim = 10
seq = [[0,1,2], [3], [4,5,6,7,8,9]]
right_data = Value.one_hot(seq, dim, dtype=dt_precision)
right_var = sequence.input_variable(shape=(dim), is_sparse=True, dtype=dt_precision)
left_data = [AA([1,1,1],dtype=dt_precision), AA([1],dtype=dt_precision), AA([1,1,1,1,1,1],dtype=dt_precision)]
left_var = sequence.input_variable(shape=(1), dtype=dt_precision)
func = times(left_var, right_var, infer_input_rank_to_map=TIMES_REDUCE_SEQUENCE_AXIS_WITHOUT_INFERRED_INPUT_RANK)
func2 = sequence.reduce_sum(times(left_var, right_var))
assert func.dynamic_axes == func2.dynamic_axes
_, forward_output = func.forward({left_var:left_data, right_var:right_data})
actual_forward = forward_output[func.output]
expected_forward = AA([[[1,1,1,0,0,0,0,0,0,0]],
[[0,0,0,1,0,0,0,0,0,0]],
[[0,0,0,0,1,1,1,1,1,1]]])
assert np.allclose(actual_forward, expected_forward)
def test_validation_before_eval():
w = C.parameter((4,C.InferredDimension))
v = C.parameter((C.InferredDimension,5))
wv = C.times(w,v)
p = C.input((4,1))
wp = C.times(w,p)
q = C.input((1,5))
qv = C.times(q,v)
with pytest.raises(ValueError):
wv.eval()
def test_free_static_axis_in_recurrence():
x = C.sequence.input_variable((C.FreeDimension, 2))
out_placeholder = C.placeholder()
out_past = C.sequence.past_value(out_placeholder)
wh = C.parameter(init=np.asarray([[2, 5], [1, 3]], dtype=np.float32))
wx = C.parameter(init=np.asarray([[1, 4], [2, 5]], dtype=np.float32))
out = C.times(x, wx) + C.times(out_past, wh)
out.replace_placeholders({out_placeholder : out})
x_data = np.asarray([[0.5, 0.2], [-0.7, 1.2]], np.float32)
w_grad, out_val = out.grad({x : x_data}, wrt=[wh, wx], outputs=[out])
assert np.allclose(out_val, [[[[0.9, 3.], [1.7, 3.2]]]])
assert np.allclose(w_grad[wx], [[-0.2, -0.2], [1.4, 1.4]])
def cross_entropy_with_sampled_softmax(
hidden_vector, # Node providing the output of the recurrent layers
target_vector, # Node providing the expected labels (as sparse vectors)
vocab_dim, # Vocabulary size
hidden_dim, # Dimension of the hidden vector
num_samples, # Number of samples to use for sampled softmax
sampling_weights, # Node providing weights to be used for the weighted sampling
allow_duplicates = False # Boolean flag to control whether to use sampling with replacement (allow_duplicates == True) or without replacement.
):
bias = C.Parameter(shape = (vocab_dim, 1), init = 0)
weights = C.Parameter(shape = (vocab_dim, hidden_dim), init = C.initializer.glorot_uniform())
sample_selector_sparse = C.random_sample(sampling_weights, num_samples, allow_duplicates) # sparse matrix [num_samples * vocab_size]
if use_sparse:
sample_selector = sample_selector_sparse
else:
# Note: Sampled softmax with dense data is only supported for debugging purposes.
# It might easily run into memory issues as the matrix 'I' below might be quite large.
# In case we wan't to a dense representation for all data we have to convert the sample selector
I = C.Constant(np.eye(vocab_dim, dtype=np.float32))
sample_selector = C.times(sample_selector_sparse, I)
inclusion_probs = C.random_sample_inclusion_frequency(sampling_weights, num_samples, allow_duplicates) # dense row [1 * vocab_size]
log_prior = C.log(inclusion_probs) # dense row [1 * vocab_dim]
print("hidden_vector: "+str(hidden_vector.shape))
wS = C.times(sample_selector, weights, name='wS') # [num_samples * hidden_dim]
print("ws:"+str(wS.shape))
zS = C.times_transpose(wS, hidden_vector, name='zS1') + C.times(sample_selector, bias, name='zS2') - C.times_transpose (sample_selector, log_prior, name='zS3')# [num_samples]
# Getting the weight vector for the true label. Dimension hidden_dim
wT = C.times(target_vector, weights, name='wT') # [1 * hidden_dim]
zT = C.times_transpose(wT, hidden_vector, name='zT1') + C.times(target_vector, bias, name='zT2') - C.times_transpose(target_vector, log_prior, name='zT3') # [1]
zSReduced = C.reduce_log_sum_exp(zS)
# Compute the cross entropy that is used for training.
# We don't check whether any of the classes in the random samples coincides with the true label, so it might happen that the true class is counted
# twice in the normalizing denominator of sampled softmax.
cross_entropy_on_samples = C.log_add_exp(zT, zSReduced) - zT
# For applying the model we also output a node providing the input for the full softmax
z = C.times_transpose(weights, hidden_vector) + bias
z = C.reshape(z, shape = (vocab_dim))
zSMax = C.reduce_max(zS)
error_on_samples = C.less(zT, zSMax)
return (z, cross_entropy_on_samples, error_on_samples)
def test_replace_placeholder_s():
left_val = [[10,2]]
right_val = [[2],[3]]
p = C.placeholder(shape=(1,2))
c = C.constant(left_val)
op = C.times(p, right_val)
op.replace_placeholders({p:c})
assert op.eval() == 26
op = C.times(p, right_val)
op.replace_placeholder(c)
assert op.eval() == 26
def test_clone_freeze():
inputs = 3
outputs = 5
features = C.input_variable((inputs), np.float32)
label = C.input_variable((outputs), np.float32)
weights = C.parameter((inputs, outputs))
const_weights = C.constant(weights.value)
z = C.times(features, weights)
c = C.times(features, const_weights)
z_clone = z.clone('freeze')
c_clone = c.clone('freeze')
# check that z and z_clone are the same
for p, q in zip(z.parameters, z_clone.constants):
assert np.array_equal(p.value, q.value)
# check that c and c_clone are the same
for p, q in zip(c.constants, c_clone.constants):
assert np.array_equal(p.value, q.value)
# keep copies of the old values
z_copies = [q.value for q in z_clone.constants]
c_copies = [q.value for q in c_clone.constants]
# update z
trainer = C.Trainer(z, C.squared_error(z, label), C.sgd(z.parameters, C.learning_rate_schedule(1.0, C.UnitType.minibatch)))
x = np.random.randn(16,3).astype('f')
y = np.random.randn(16,5).astype('f')
trainer.train_minibatch({features: x, label: y})
# update c
for cc in c.constants:
cc.value = np.random.randn(*cc.value.shape).astype('f')
# check that z changed
for p, q in zip(z.parameters, z_clone.constants):
assert not np.array_equal(p.value, q.value)
# check that z_clone did not change
for p, q in zip(z_copies, z_clone.constants):
assert np.array_equal(p, q.value)
# check that c changed
for p, q in zip(c.constants, c_clone.constants):
assert not np.array_equal(p.value, q.value)
# check that c_clone did not change
for p, q in zip(c_copies, c_clone.constants):
assert np.array_equal(p, q.value)
def _graph_dict():
# This function creates a graph that has no real meaning other than
# providing something to traverse.
d = {}
d['i1'] = C.sequence.input_variable(shape=(2, 3), sequence_axis=Axis('ia'), name='i1')
d['c1'] = C.constant(shape=(2, 3), value=6, name='c1')
d['p1'] = C.parameter(shape=(3, 2), init=7, name='p1')
d['op1'] = C.plus(d['i1'], d['c1'], name='op1')
d['op2'] = C.times(d['op1'], d['p1'], name='op2')
#d['slice'] = slice(d['c1'], Axis.default_dynamic_axis(), 0, 3)
#label_sentence_start = sequence.first(raw_labels)
# no name
d['p2'] = C.parameter(shape=(2, 2))
# duplicate names
d['op3a'] = C.plus(d['op2'], d['p2'], name='op3')
d['op3b'] = C.plus(d['op3a'], d['p2'], name='op3')
d['first'] = C.sequence.first(d['op3b'], name='past')
d['root'] = d['first']
return d
def test_op_gather_sparse(device_id):
input_sparse_indices = [[1, 3, 5, 5], [2, 4], [0, 2]]
vocab_size = 6
input_data = Value.one_hot(input_sparse_indices, vocab_size)
a = C.sequence.input_variable(shape=(vocab_size,), is_sparse=True, name='a')
a_last = C.sequence.last(a)
a_last_dense = C.times(a_last, np.eye(vocab_size))
res = a_last_dense.eval({a : input_data})
assert np.array_equal(res, [[0, 0, 0, 0, 0, 1], [0, 0, 0, 0, 1, 0], [0, 0, 1, 0, 0, 0]])
a_last_2 = C.sequence.slice(a, -2, 0)
a_last_2_dense = C.times(a_last_2, np.eye(vocab_size))
res = a_last_2_dense.eval({a : input_data})
assert np.array_equal(res, [[[0, 0, 0, 0, 0, 1], [0, 0, 0, 0, 0, 1]], [[0, 0, 1, 0, 0, 0], [0, 0, 0, 0, 1, 0]], [[1, 0, 0, 0, 0, 0], [0, 0, 1, 0, 0, 0]]])
def test_trainer_with_some_params_not_learned():
input_dim = 2
proj_dim = 2
x = input_variable(shape=(input_dim,))
W = parameter(shape=(input_dim, proj_dim), init=glorot_uniform())
B = parameter(shape=(proj_dim,), init=glorot_uniform())
t = times(x, W)
z = t + B
W_orig_value = W.value
B_orig_value = B.value
labels = input_variable(shape=(proj_dim,))
ce = cross_entropy_with_softmax(z, labels)
pe = classification_error(z, labels)
lr_per_sample = learning_rate_schedule(0.1, UnitType.sample)
trainer = Trainer(z, (ce, pe), sgd([W], lr_per_sample))
x_value = [[1, 1],[2, 2]]
label_value = [[0, 1], [1, 0]]
arguments = {x: x_value, labels: label_value}
num_iters = 3
for i in range(num_iters):
trainer.train_minibatch(arguments)
assert np.array_equal(B.value, B_orig_value)
assert not np.array_equal(W.value, W_orig_value)
W_orig_value = W.value
trainer.test_minibatch(arguments)
def test_op_batch_times_grad_with_beta_equals_to_one(left_operand, right_operand, device_id, precision):
dt_precision = PRECISION_TO_TYPE[precision]
a = AA(left_operand, dtype=dt_precision)
b = AA(right_operand, dtype=dt_precision)
root_gradient = np.ones_like(a)
input1 = C.input_variable((2,2), needs_gradient=True)
input2 = C.input_variable((2,2), needs_gradient=True)
z = input1 + input2 + C.times(input1, input2)
state, actual_forward = z.forward({input1: a, input2: b}, [z.output], {z.output}, cntk_device(device_id))
actual_backwards = z.backward(state, {z.output: root_gradient}, [input1, input2])
k = a.shape[0]
left_backward = np.ones_like(a)
for x in range(k):
left_backward[x, ...] += b[x].sum(axis=-1)
right_backward = np.ones_like(b)
for x in range(k):
transpose_axes = list(np.roll(np.arange(len(b.shape[1:])), -1))
sum_axes = tuple(np.arange(0, len(a.shape) - len(b.shape) + 1))
right_backward[x, ...] += np.transpose(
AA([a[x].sum(axis=sum_axes)]), axes=transpose_axes)
assert np.allclose(actual_backwards[input1], left_backward)
assert np.allclose(actual_backwards[input2], right_backward)
def create_fast_rcnn_predictor(conv_out, rois, fc_layers):
# RCNN
roi_out = roipooling(conv_out, rois, cntk.MAX_POOLING, (roi_dim, roi_dim), spatial_scale=1/16.0)
fc_out = fc_layers(roi_out)
# prediction head
W_pred = parameter(shape=(4096, globalvars['num_classes']), init=normal(scale=0.01), name="cls_score.W")
b_pred = parameter(shape=globalvars['num_classes'], init=0, name="cls_score.b")
cls_score = plus(times(fc_out, W_pred), b_pred, name='cls_score')
# regression head
W_regr = parameter(shape=(4096, globalvars['num_classes']*4), init=normal(scale=0.001), name="bbox_regr.W")
b_regr = parameter(shape=globalvars['num_classes']*4, init=0, name="bbox_regr.b")
bbox_pred = plus(times(fc_out, W_regr), b_regr, name='bbox_regr')
return cls_score, bbox_pred
def test_data_type_inference():
x_float = C.input_variable((1,), dtype = np.float64)
param1 = C.parameter((C.InferredDimension, 1), init = C.glorot_uniform(), dtype = C.cntk_py.DataType_Unknown)
assert (param1.get_data_type() == C.cntk_py.DataType_Unknown)
x_times_param1 = C.times(x_float, param1)
assert (param1.dtype == np.float64)
def session(is_sparse):
x = C.input_variable((200,), is_sparse=is_sparse)
w = C.parameter((200, 100))
y = C.times(x, w)
z = [0] * 100 + [1] * 100
for i in range(200):
j = (3 * i * i + 5 * i + 1) % 200 # just a random looking index
z[i], z[j] = z[j], z[i]
import scipy.sparse
x11 = scipy.sparse.csr_matrix(np.array([1] * 200).astype('f'))
x01 = scipy.sparse.csr_matrix(np.array(z).astype('f'))
t = C.Trainer(y, y, learner(y.parameters))
w.value = 0 * w.value
t.train_minibatch({x: [x11]})
t.train_minibatch({x: [x01]})
t.train_minibatch({x: [x01]})
if checkpoint:
t.save_checkpoint(str(tmpdir.join('checkpoint')))
t.train_minibatch({x: [x11]})
t.train_minibatch({x: [x01]})
t.train_minibatch({x: [x01]})
t.restore_from_checkpoint(str(tmpdir.join('checkpoint')))
t.train_minibatch({x: [x01]})
t.train_minibatch({x: [x01]})
t.train_minibatch({x: [x11]})
return w.value
def create_fast_rcnn_predictor(conv_out, rois, fc_layers, cfg):
# RCNN
roi_out = roipooling(conv_out, rois, cntk.MAX_POOLING, (cfg["MODEL"].ROI_DIM, cfg["MODEL"].ROI_DIM), spatial_scale=1/16.0)
fc_out = fc_layers(roi_out)
# prediction head
W_pred = parameter(shape=(4096, cfg["DATA"].NUM_CLASSES), init=normal(scale=0.01), name="cls_score.W")
b_pred = parameter(shape=cfg["DATA"].NUM_CLASSES, init=0, name="cls_score.b")
cls_score = plus(times(fc_out, W_pred), b_pred, name='cls_score')
# regression head
W_regr = parameter(shape=(4096, cfg["DATA"].NUM_CLASSES*4), init=normal(scale=0.001), name="bbox_regr.W")
b_regr = parameter(shape=cfg["DATA"].NUM_CLASSES*4, init=0, name="bbox_regr.b")
bbox_pred = plus(times(fc_out, W_regr), b_regr, name='bbox_regr')
return cls_score, bbox_pred
def create_model(self):
self.input_dim = 1000
self.embed_dim = 30
i = C.input_variable((self.input_dim,), is_sparse=True)
self.p = C.parameter(shape=(self.input_dim, self.embed_dim), init=1)
o = C.times(i, self.p)
self.z = C.reduce_sum(o)
def test_large_model_serialization_double(tmpdir):
import os;
two_gb = 2**31
type_size = np.dtype(np.float64).itemsize
size = two_gb / type_size + 10
assert size * type_size > two_gb
device = C.device.cpu()
i = C.sequence.input(size, dtype=np.float64)
w = C.Parameter((size,), dtype=np.float64,
init=C.uniform(3.0, seed=12345), device=device)
z = C.times(i, w)
filename = str(tmpdir / 'test_large_model_serialization_double.out')
z.save(filename)
assert os.path.getsize(filename) > two_gb
y = C.Function.load(filename, device=device)
assert (len(z.parameters) == len(y.parameters))
for param_pair in zip(z.parameters, y.parameters):
assert param_pair[0].shape == param_pair[1].shape
assert np.allclose(param_pair[0].value, param_pair[1].value)
def linear_layer(input_var, output_dim):
input_dim = input_var.shape[0]
times_param = C.parameter(shape=(input_dim, output_dim))
bias_param = C.parameter(shape=(output_dim))
t = C.times(input_var, times_param)
return bias_param + t
def attention_pooling(inputs, inputs_mask, inputs_weights, decode, decode_weights, keys):
"""
inputs: shape=(n, dim)
inputs_weight: shape=(dim, dim)
decode: shape=(1, dec_dim)
decode_weights: shape=(dec_dim, dim)
keys: shape=(dim, 1)
"""
w_in = C.times(inputs, inputs_weights) #shape=(n, dim)
w_dec = C.times(decode, decode_weights) #shape=(dim, 1)
S = C.tanh(w_in + C.sequence.broadcast_as(w_dec, w_in)) #shape=(n, dim)
S = C.element_select(inputs_mask, S, C.constant(-1e+30))
S = C.times(S, keys) #shape=(n)
S = C.ops.sequence.softmax(S, name="softmax")
attention = C.reduce_sum(inputs * S, axis=0)
return attention
def _sparse_to_dense_network_cache(input_shape, is_sequence, device):
if is_sequence:
temp_input = C.sequence.input_variable(input_shape, is_sparse=True)
else:
temp_input = C.input_variable(input_shape, is_sparse=True)
eye_shape = input_shape[-1]
return C.times(temp_input, np.eye(eye_shape))
def _to_dense(val, is_sequence=False):
if is_sequence:
x = C.sequence.input_variable(val.shape[2:], is_sparse=True)
else:
x = C.input_variable(val.shape[1:], is_sparse=True)
dense = C.times(x, C.constant(value=np.eye(val.shape[-1], dtype=np.float32)))
return dense.eval({x : val}, device=val.device)
def linear_layer(input_var, output_dim):
input_dim = input_var.shape[0]
weight_param = C.parameter(shape=(input_dim, output_dim))
bias_param = C.parameter(shape=(output_dim))
param_dict['w'], param_dict['b'] = weight_param, bias_param
return C.times(input_var, weight_param) + bias_param
def test_nce_backward_indices(classes, xdim, batch, expected_value, device_id, precision):
"""
Simple test that makes sure that the derivatives have the correct sparsity pattern
"""
# ignore precision, only sparsity pattern matters for this test
dt = np.float32
from cntk.losses import nce_loss
import scipy
trials = 10
# Establish baseline
expected_count = np.zeros(classes)
I = C.constant(np.eye(classes, dtype=dt))
q = np.arange(classes, dtype=dt) + 1
z = C.reduce_sum(C.times(C.random_sample(q, 32, True, seed=98052), I), axis=0)
for i in range(trials):
expected_count[np.nonzero(z.eval().ravel())] += 1
# Set things up to measure the same thing with nce_loss
x = C.input_variable(xdim, needs_gradient=True)
y = C.input_variable(classes, is_sparse=True)
x0 = np.arange(batch * xdim, dtype=dt).reshape((batch, xdim))/(batch * xdim)
data = np.ones(batch, dtype=dt)
indices = list(range(10,10*batch+1,10))
indptr = list(range(batch+1))
y0 = scipy.sparse.csr_matrix((data, indices, indptr), shape=(batch, classes))
b = C.parameter((classes, 1))
W = C.parameter((classes, C.InferredDimension))
gb = np.zeros(classes)
vb = C.input_variable((classes, 1), dtype=dt)
Ib = C.constant(np.eye(1, dtype=dt))
zb = C.times(vb, Ib)
loss = C.nce_loss(W, b, x, y, q, seed=98052)
for i in range(trials):
v = loss.grad({x: x0, y: y0}, wrt=loss.parameters, as_numpy=False)
gb[np.nonzero(zb.eval({vb: v[b]}).ravel())] += 1
for i in range(classes):
assert gb[i] == expected_count[i] or (i in indices and gb[i] == trials)
def test_2d_sparse_csr_batch_input(device_id):
dev = cntk_device(device_id)
features = C.input_variable((2, 3), is_sparse=True)
w = C.parameter(init=np.asarray([[0.5, 1], [-.5, 2], [1., 1.5]], dtype=np.float32), device=dev)
t = C.times(features, w)
features_data = [sp.sparse.csr_matrix(np.asarray([[1.,0.,0.], [0.,1.,0.]], dtype=np.float32)),
sp.sparse.csr_matrix(np.asarray([[0.,0.,1.], [1.,0.,0.]], dtype=np.float32))]
result = t.eval({features : features_data}, device=dev)
assert np.array_equal(result, [[[.5, 1], [-.5, 2]], [[1, 1.5], [.5, 1]]])
def returnFunction():
left_val = [[10,2]]
right_val = [[2],[3]]
p = placeholder(shape=(1,2))
op = times(p, right_val)
c = constant(left_val)
return op.replace_placeholders({p:c})
def test_eval_sparse_dense(tmpdir, device_id):
from cntk import Axis
from cntk.io import MinibatchSource, CTFDeserializer, StreamDef, StreamDefs
from cntk.ops import input_variable, times
input_vocab_dim = label_vocab_dim = 69
ctf_data = '''\
0 |S0 3:1 |# <s> |S1 3:1 |# <s>
0 |S0 4:1 |# A |S1 32:1 |# ~AH
0 |S0 5:1 |# B |S1 36:1 |# ~B
0 |S0 4:1 |# A |S1 31:1 |# ~AE
0 |S0 7:1 |# D |S1 38:1 |# ~D
0 |S0 12:1 |# I |S1 47:1 |# ~IY
0 |S0 1:1 |# </s> |S1 1:1 |# </s>
2 |S0 60:1 |# <s> |S1 3:1 |# <s>
2 |S0 61:1 |# A |S1 32:1 |# ~AH
'''
ctf_file = str(tmpdir/'2seqtest.txt')
with open(ctf_file, 'w') as f:
f.write(ctf_data)
mbs = MinibatchSource(CTFDeserializer(ctf_file, StreamDefs(
features = StreamDef(field='S0', shape=input_vocab_dim, is_sparse=True),
labels = StreamDef(field='S1', shape=label_vocab_dim, is_sparse=True)
)), randomize=False, epoch_size = 2)
batch_axis = Axis.default_batch_axis()
input_seq_axis = Axis('inputAxis')
label_seq_axis = Axis('labelAxis')
input_dynamic_axes = [batch_axis, input_seq_axis]
raw_input = input_variable(
shape=input_vocab_dim, dynamic_axes=input_dynamic_axes,
name='raw_input', is_sparse=True)
mb_valid = mbs.next_minibatch(minibatch_size_in_samples=100,
input_map={raw_input : mbs.streams.features},
device=cntk_device(device_id))
z = times(raw_input, np.eye(input_vocab_dim))
e_reader = z.eval(mb_valid, device=cntk_device(device_id))
# CSR with the raw_input encoding in ctf_data
one_hot_data = [
[3, 4, 5, 4, 7, 12, 1],
[60, 61]
]
data = [csr(np.eye(input_vocab_dim, dtype=np.float32)[d]) for d in
one_hot_data]
e_csr = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a,b in zip(e_reader, e_csr)])
# One-hot with the raw_input encoding in ctf_data
data = Value.one_hot(one_hot_data, num_classes=input_vocab_dim, device=cntk_device(device_id))
e_hot = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a,b in zip(e_reader, e_hot)])
def test_op_gather_grad(device_id):
dim = 10
ii = C.sequence.input_variable(())
param = C.parameter((dim, 1), init=np.reshape(np.arange(dim), (dim,1)).astype(np.float32))
ss = C.gather(param, ii)
data = [[0], [0,1,2], [1,2,3,4,5, 6]]
grad1 = ss.grad(data, wrt=[param])
ss2 = C.times(C.one_hot(ii, num_classes=dim, sparse_output=False), param)
grad2 = ss2.grad(data, wrt=[param])
assert np.array_equal(grad1, grad2)
def test_ext_eval_5_times():
dim = 2
p_init = 10
p = C.parameter(shape=(dim,), init=p_init, name='p')
m = C.user_function(MyPlus(p, C.constant(3)))
z = C.times(m, C.parameter(shape=(2, 50), init=2))
result = z.eval()
# No batch dimension since we have no input
assert np.allclose(result, ((p_init * np.ones_like(result)) + 3) * 2 * 2)
def LSTMCell(x, y, dh, dc):
'''LightLSTM Cell'''
b = C.parameter(shape=(4 * cell_dim), init=0)
W = C.parameter(shape=(input_dim, 4 * cell_dim), init=glorot_uniform())
H = C.parameter(shape=(cell_dim, 4 * cell_dim), init=glorot_uniform())
# projected contribution from input x, hidden, and bias
proj4 = b + C.times(x, W) + C.times(dh, H)
it_proj = C.slice(proj4, -1, 0 * cell_dim, 1 * cell_dim)
bit_proj = C.slice(proj4, -1, 1 * cell_dim, 2 * cell_dim)
ft_proj = C.slice(proj4, -1, 2 * cell_dim, 3 * cell_dim)
ot_proj = C.slice(proj4, -1, 3 * cell_dim, 4 * cell_dim)
it = C.sigmoid(it_proj) # input gate
bit = it * C.tanh(bit_proj)
ft = C.sigmoid(ft_proj) # forget gate
bft = ft * dc
ct = bft + bit
ot = C.sigmoid(ot_proj) # output gate
ht = ot * C.tanh(ct)
# projected contribution from input y, hidden, and bias
proj4_2 = b + C.times(y, W) + C.times(ht, H)
it_proj_2 = C.slice(proj4_2, -1, 0 * cell_dim, 1 * cell_dim)
bit_proj_2 = C.slice(proj4_2, -1, 1 * cell_dim, 2 * cell_dim)
ft_proj_2 = C.slice(proj4_2, -1, 2 * cell_dim, 3 * cell_dim)
ot_proj_2 = C.slice(proj4_2, -1, 3 * cell_dim, 4 * cell_dim)
it_2 = C.sigmoid(it_proj_2) # input gate
bit_2 = it_2 * C.tanh(bit_proj_2)
ft_2 = C.sigmoid(ft_proj_2) # forget gate
bft_2 = ft_2 * ct
ct2 = bft_2 + bit_2
ot_2 = C.sigmoid(ot_proj_2) # output gate
ht2 = ot_2 * C.tanh(ct2)
return (ht, ct, ht2, ct2)
def test_eval_sparse_no_seq(batch_index_data, device_id):
dim = 10
multiplier = 2
for var_is_sparse in [True, False]:
in1 = input_variable(shape=(dim,), is_sparse=var_is_sparse)
z = times(in1, multiplier*np.eye(dim))
batch = np.eye(dim)[batch_index_data]
expected = batch * multiplier
sparse_val = csr(batch.astype('f'))
result = z.eval({in1: [sparse_val]}, device=cntk_device(device_id))
assert np.allclose(result, [expected])
def test_op_scatter_sparse(device_id):
input_sparse_indices = [[1, 3, 5, 5], [2, 4], [0, 2]]
vocab_size = 6
input_data = Value.one_hot(input_sparse_indices, vocab_size)
a = C.sequence.input_variable(shape=(vocab_size,), is_sparse=True, name='a')
a_last_scatter = C.sequence.scatter(C.sequence.last(a), C.sequence.is_first(a))
a_last_scatter_dense = C.times(a_last_scatter, np.eye(vocab_size))
res = a_last_scatter_dense.eval({a : input_data})
assert np.array_equal(res[0], np.asarray([[0, 0, 0, 0, 0, 1], [0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0]]))
assert np.array_equal(res[1], np.asarray([[0, 0, 0, 0, 1, 0], [0, 0, 0, 0, 0, 0]]))
assert np.array_equal(res[2], np.asarray([[0, 0, 1, 0, 0, 0], [0, 0, 0, 0, 0, 0]]))
def func(x_var):
x = C.placeholder()
WT = C.Parameter((
dim,
dim,
),
init=transform_weight_initializer,
name=name + '_WT')
bT = C.Parameter(dim,
init=transform_bias_initializer,
name=name + '_bT')
WU = C.Parameter((
dim,
dim,
),
init=update_weight_initializer,
name=name + '_WU')
bU = C.parameter(dim, init=update_bias_initializer, name=name + '_bU')
transform_gate = C.sigmoid(C.times(x, WT, name=name + '_T') + bT)
update = C.tanh(C.times(x, WU, name=name + '_U') + bU)
return C.as_block(update * transform_gate + (1 - transform_gate) * x,
[(x, x_var)], 'SingleInner', 'SingleInner' + name)
def cross_entropy_with_sampled_softmax(
hidden_vector,
label_vector,
vocab_dim,
hidden_dim,
num_samples,
sampling_weights,
allow_duplicates = False
):
bias = C.layers.Parameter(shape = (vocab_dim, 1), init = 0)
weights = C.layers.Parameter(shape = (vocab_dim, hidden_dim), init = C.initializer.glorot_uniform())
sample_selector_sparse = C.random_sample(sampling_weights, num_samples, allow_duplicates)
sample_selector = sample_selector_sparse
inclusion_probs = C.random_sample_inclusion_frequency(sampling_weights, num_samples, allow_duplicates)
log_prior = C.log(inclusion_probs)
wS = C.times(sample_selector, weights, name='wS')
zS = C.times_transpose(wS, hidden_vector, name='zS1') + C.times(sample_selector, bias, name='zS2') - C.times_transpose (sample_selector, log_prior, name='zS3')
# Getting the weight vector for the true label. Dimension hidden_dim
wT = C.times(label_vector, weights, name='wT')
zT = C.times_transpose(wT, hidden_vector, name='zT1') + C.times(label_vector, bias, name='zT2') - C.times_transpose(label_vector, log_prior, name='zT3')
zSReduced = C.reduce_log_sum_exp(zS)
# Compute the cross entropy that is used for training.
cross_entropy_on_samples = C.log_add_exp(zT, zSReduced) - zT
# For applying the model we also output a node providing the input for the full softmax
z = C.times_transpose(weights, hidden_vector) + bias
z = C.reshape(z, shape = (vocab_dim))
zSMax = C.reduce_max(zS)
error_on_samples = C.less(zT, zSMax)
return (z, cross_entropy_on_samples, error_on_samples)
def test_eval_one_hot_seq(one_hot_batch, device_id):
dim = 10
multiplier = 2
for var_is_sparse in [True, False]:
in1 = sequence.input_variable(shape=(dim,), is_sparse=var_is_sparse)
# Convert CNTK node value to dense so that we can compare it later
z = times(in1, np.eye(dim)*multiplier)
# Convert expectation to dense
expected = [np.eye(dim)[seq]*multiplier for seq in one_hot_batch]
batch = Value.one_hot(one_hot_batch, num_classes=dim, device=cntk_device(device_id))
result = z.eval({in1: batch}, device=cntk_device(device_id))
assert np.all([np.allclose(a,b) for a,b in zip(result, expected)])
def createNetwork(self, inputEmb, preHidden, preMem):
WX = C.times(inputEmb, self.W) + self.Wb
UH = C.times(preHidden, self.U) + self.Ub
I = C.sigmoid(
C.slice(WX, -1, 0, self.hiddenSize) +
C.slice(UH, -1, 0, self.hiddenSize))
O = C.sigmoid(
C.slice(WX, -1, self.hiddenSize, self.hiddenSize * 2) +
C.slice(UH, -1, self.hiddenSize, self.hiddenSize * 2))
F = C.sigmoid(
C.slice(WX, -1, self.hiddenSize * 2, self.hiddenSize * 3) +
C.slice(UH, -1, self.hiddenSize * 2, self.hiddenSize * 3))
N = C.tanh(
C.slice(WX, -1, self.hiddenSize * 3, self.hiddenSize * 4) +
C.slice(UH, -1, self.hiddenSize * 3, self.hiddenSize * 4))
NI = C.element_times(N, I)
FM = C.element_times(F, preMem)
CurMem = NI + FM
CurH = C.element_times(C.tanh(CurMem), O)
return (CurH, CurMem)
def test_disallow_seq_starts_with_Value_objects():
one_hot_batch = [[2, 5], [0, 1, 6]]
dim = 10
in1 = input(shape=(dim, ), is_sparse=True)
z = times(in1, np.eye(dim))
batch = Value.one_hot(one_hot_batch, num_classes=dim)
with pytest.raises(ValueError):
result = z.eval(({in1: batch}, len(batch) * [True]))
with pytest.raises(ValueError):
result = z.eval({in1: (batch, len(batch) * [True])})
def func(x_var):
x = C.placeholder()
WT = C.Parameter((
dim,
dim,
),
init=transform_weight_initializer,
name=name + '_WT')
bT = C.Parameter(dim,
init=transform_bias_initializer,
name=name + '_bT')
WU = C.Parameter((
dim,
dim,
),
init=update_weight_initializer,
name=name + '_WU')
bU = C.Parameter(dim, init=update_bias_initializer, name=name + '_bU')
transform_gate = C.sigmoid(C.times(x, WT, name=name + '_T') + bT)
update = C.relu(C.times(x, WU, name=name + '_U') + bU)
return C.as_block(x + transform_gate * (update - x), [(x, x_var)],
'HighwayBlock', 'HighwayBlock' + name)
def test_gather_implementation_using_one_hot_and_times():
num_classes = 4
w_init = np.asarray([[0, 1], [2, 3], [4, 5], [6, 7]]).astype(np.float32)
w = C.parameter(init=w_init)
x = C.input_variable((2, ))
sparse_one_hot = C.one_hot(x, num_classes, sparse_output=True)
t = C.times(sparse_one_hot, w)
indices = np.asarray([[0, 3], [2, 1]], dtype=np.float32)
result = t.eval({x: indices})
expected_result = np.asarray([[[0., 1.], [6., 7.]], [[4., 5.], [2., 3.]]])
assert np.array_equal(result, expected_result)
def test_op_times_reduce_sequence_axis(device_id, precision):
dt_precision = PRECISION_TO_TYPE[precision]
from cntk import times, Value, TIMES_REDUCE_SEQUENCE_AXIS_WITHOUT_INFERRED_INPUT_RANK
from cntk import sequence
dim = 10
seq = [[0, 1, 2], [3], [4, 5, 6, 7, 8, 9]]
right_data = Value.one_hot(seq, dim, dtype=dt_precision)
right_var = sequence.input_variable(shape=(dim),
is_sparse=True,
dtype=dt_precision)
left_data = [
AA([1, 1, 1], dtype=dt_precision),
AA([1], dtype=dt_precision),
AA([1, 1, 1, 1, 1, 1], dtype=dt_precision)
]
left_var = sequence.input_variable(shape=(1), dtype=dt_precision)
func = times(left_var,
right_var,
infer_input_rank_to_map=
TIMES_REDUCE_SEQUENCE_AXIS_WITHOUT_INFERRED_INPUT_RANK)
func2 = sequence.reduce_sum(times(left_var, right_var))
assert func.dynamic_axes == func2.dynamic_axes
_, forward_output = func.forward({
left_var: left_data,
right_var: right_data
})
actual_forward = forward_output[func.output]
expected_forward = AA([[[1, 1, 1, 0, 0, 0, 0, 0, 0, 0]],
[[0, 0, 0, 1, 0, 0, 0, 0, 0, 0]],
[[0, 0, 0, 0, 1, 1, 1, 1, 1, 1]]])
assert np.allclose(actual_forward, expected_forward)
def test_debug_multi_output():
input_dim = 2
num_output_classes = 2
f_input = input_variable(input_dim,
np.float32,
needs_gradient=True,
name='features')
p = parameter(shape=(input_dim, ), init=10, name='p')
comb = combine([f_input, p])
ins = InStream(['n', 'n', 'n', 'n', 'n'])
outs = OutStream()
z = times(comb.outputs[0], comb.outputs[1], name='z')
z = debug_model(z, ins, outs)
l_input = input_variable(num_output_classes, np.float32, name='labels')
loss = cross_entropy_with_softmax(z, l_input)
eval_error = classification_error(z, l_input)
_train(z, loss, eval_error, loss.find_by_name('features'),
loss.find_by_name('labels'), num_output_classes, 1)
# outs.written contains something like
# =================================== forward ===================================
# Parameter('p', [], [2]) with uid 'Parameter4'
# Input('features', [#, *], [2]) with uid 'Input3'
# Times: Output('UserDefinedFunction12_Output_0', [#, *], [2]), Output('UserDefinedFunction15_Output_0', [], [2]) -> Output('z', [#, *], [2 x 2]) with uid 'Times21'
# =================================== backward ===================================
# Times: Output('UserDefinedFunction12_Output_0', [#, *], [2]), Output('UserDefinedFunction15_Output_0', [], [2]) -> Output('z', [#, *], [2 x 2]) with uid 'Times21'
# Input('features', [#, *], [2]) with uid 'Input3'
# Parameter('p', [], [2]) with uid 'Parameter4' assert outs.written == out_stuff
assert len(outs.written) == 8
v_p = "Parameter('p', "
v_i = "Input('features'"
v_t = 'Times: '
assert outs.written[0].startswith('=') and 'forward' in outs.written[0]
line_1, line_2, line_3 = outs.written[1:4]
assert outs.written[4].startswith('=') and 'backward' in outs.written[4]
line_5, line_6, line_7 = outs.written[5:8]
assert line_5.startswith(v_t)
assert line_6.startswith(v_p) and line_7.startswith(v_i) or \
line_6.startswith(v_i) and line_7.startswith(v_p)
def test_to_sequence_backprop(device_id):
dev = cntk_device(device_id)
input_vocab_size=3
emb_dim = 2
hidden_dim = 2
num_labels = 2
x_seq_input = C.sequence.input_variable(input_vocab_size, is_sparse=True, name='features')
with C.default_options(initial_state=0.1):
model = C.layers.Embedding(emb_dim, name='embed')(x_seq_input)
model = C.layers.Recurrence(C.layers.LSTM(hidden_dim), go_backwards=False)(model)
model = C.layers.Dense(num_labels, name='classify')(model)
z = model
label_seq_input = C.sequence.input_variable(num_labels, is_sparse=True, name='labels')
ce = C.cross_entropy_with_softmax(z, label_seq_input)
seq1_data = [[0, 1, 1], [0, 1, 0], [1, 0, 0]]
seq2_data = [[0, 0, 1], [0, 1, 1]]
seq1_label_data = [[0, 1], [0, 1], [1, 0]]
seq2_label_data = [[1, 0], [0, 1]]
label_seq_data = [_to_csr(seq1_label_data), _to_csr(seq2_label_data)]
param_grads_1, loss_result_1 = ce.grad({x_seq_input : [_to_csr(seq1_data), _to_csr(seq2_data)], label_seq_input : label_seq_data},
wrt=ce.parameters, outputs=[ce], as_numpy=False)
# Create a clone of the model that uses a non-sequence input
# and converts it to a sequence using to_sequence
x_non_seq_input = C.input_variable((C.FreeDimension, input_vocab_size), is_sparse=True, name='non_seq_features')
x_seq_lens = C.input_variable((), name='sequence_lengths')
x_seq = C.to_sequence(x_non_seq_input, x_seq_lens)
x_seq = C.reconcile_dynamic_axes(C.times(x_seq, np.eye(input_vocab_size, dtype=np.float32)), label_seq_input)
ce_clone = ce.clone('share', {x_seq_input : x_seq})
x_non_seq_data = C.NDArrayView.from_csr(_to_csr([seq1_data, seq2_data + [[0, 0, 0]]]), shape=(2, 3, 3))
x_seq_lens_data = np.asarray([3, 2], dtype=np.float32)
x_non_seq_input = next(argument for argument in ce_clone.arguments if argument.name == 'non_seq_features')
label_seq_input = next(argument for argument in ce_clone.arguments if argument.name == 'labels')
x_seq_lens = next(argument for argument in ce_clone.arguments if argument.name == 'sequence_lengths')
param_grads_2, loss_result_2 = ce_clone.grad({x_non_seq_input : x_non_seq_data, x_seq_lens : x_seq_lens_data, label_seq_input : label_seq_data},
wrt=ce_clone.parameters, outputs=[ce_clone], as_numpy=False)
assert np.array_equal(loss_result_1.as_sequences()[0], loss_result_2.as_sequences()[0])
assert np.array_equal(loss_result_1.as_sequences()[1], loss_result_2.as_sequences()[1])
for param in param_grads_1:
if not param_grads_1[param].is_sparse:
reference_grad_value = param_grads_1[param].asarray()
grad_value = param_grads_2[param].asarray()
assert np.array_equal(reference_grad_value, grad_value)
def test_eval_sparse_dense(tmpdir, device_id):
from cntk import Axis
from cntk.io import MinibatchSource, CTFDeserializer, StreamDef, StreamDefs
from cntk.ops import times
input_vocab_dim = label_vocab_dim = 69
ctf_data = '''\
0 |S0 3:1 |# <s> |S1 3:1 |# <s>
0 |S0 4:1 |# A |S1 32:1 |# ~AH
0 |S0 5:1 |# B |S1 36:1 |# ~B
0 |S0 4:1 |# A |S1 31:1 |# ~AE
0 |S0 7:1 |# D |S1 38:1 |# ~D
0 |S0 12:1 |# I |S1 47:1 |# ~IY
0 |S0 1:1 |# </s> |S1 1:1 |# </s>
2 |S0 60:1 |# <s> |S1 3:1 |# <s>
2 |S0 61:1 |# A |S1 32:1 |# ~AH
'''
ctf_file = str(tmpdir/'2seqtest.txt')
with open(ctf_file, 'w') as f:
f.write(ctf_data)
mbs = MinibatchSource(CTFDeserializer(ctf_file, StreamDefs(
features = StreamDef(field='S0', shape=input_vocab_dim, is_sparse=True),
labels = StreamDef(field='S1', shape=label_vocab_dim, is_sparse=True)
)), randomize=False, max_samples = 2)
raw_input = sequence.input_variable(shape=input_vocab_dim, sequence_axis=Axis('inputAxis'), name='raw_input', is_sparse=True)
mb_valid = mbs.next_minibatch(minibatch_size_in_samples=100,
input_map={raw_input : mbs.streams.features},
device=cntk_device(device_id))
z = times(raw_input, np.eye(input_vocab_dim))
e_reader = z.eval(mb_valid, device=cntk_device(device_id))
# CSR with the raw_input encoding in ctf_data
one_hot_data = [
[3, 4, 5, 4, 7, 12, 1],
[60, 61]
]
data = [csr(np.eye(input_vocab_dim, dtype=np.float32)[d]) for d in
one_hot_data]
e_csr = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a,b in zip(e_reader, e_csr)])
# One-hot with the raw_input encoding in ctf_data
data = Value.one_hot(one_hot_data, num_classes=input_vocab_dim, device=cntk_device(device_id))
e_hot = z.eval({raw_input: data}, device=cntk_device(device_id))
assert np.all([np.allclose(a, b) for a,b in zip(e_reader, e_hot)])
def GenMatMul_1k():
feature = C.input_variable(
(
1024,
1024,
),
np.float32,
)
model = C.times(feature, C.parameter((1024, 1024),
init=C.glorot_uniform()))
data_feature = np.random.rand(1, *feature.shape).astype(np.float32)
data_output = model.eval(data_feature)
Save("test_MatMul_1k", model, data_feature, data_output)
def __init__(self):
self.input_dim = 40000
self.embed_dim = 100
self.batch_size = 20
i = C.input_variable((self.input_dim, ), is_sparse=True)
self.p = C.parameter(shape=(self.input_dim, self.embed_dim), init=1)
o = C.times(i, self.p)
z = C.reduce_sum(o)
learner = C.data_parallel_distributed_learner(
C.sgd(
z.parameters,
C.learning_rate_schedule(0.01,
unit=C.learners.UnitType.sample)))
self.trainer = C.Trainer(z, (z, None), learner, [])
def createNetwork(self, length):
networkHiddenTrg = {}
networkMemTrg = {}
inputTrg = C.reshape(self.inputMatrixTrg,
shape=(Config.TrgMaxLength, Config.BatchSize,
Config.TrgVocabSize))
tce = 0
for i in range(0, length - 1, 1):
if (i == 0):
networkHiddenTrg[i] = self.firstHidden
networkMemTrg[i] = networkHiddenTrg[i]
else:
(networkHiddenTrg[i],
networkMemTrg[i]) = self.Decoder.createNetwork(
self.Emb(inputTrg[i]), networkHiddenTrg[i - 1],
networkMemTrg[i - 1])
preSoftmax = C.times(networkHiddenTrg[i], self.Wt) + self.Wtb
ce = C.cross_entropy_with_softmax(preSoftmax, inputTrg[i + 1], 2)
tce += C.times(
C.reshape(ce, shape=(1, Config.BatchSize)),
C.reshape(self.maskMatrixTrg[i], shape=(Config.BatchSize, 1)))
return tce
def train_eval_logistic_regression_from_file(criterion_name=None,
eval_name=None,
device_id=-1):
cur_dir = os.path.dirname(__file__)
# Using data from https://github.com/Microsoft/CNTK/wiki/Tutorial
train_file = os.path.join(cur_dir, "Train-3Classes.txt")
test_file = os.path.join(cur_dir, "Test-3Classes.txt")
X = C.input(2)
y = C.input(3)
W = C.parameter(value=np.zeros(shape=(3, 2)))
b = C.parameter(value=np.zeros(shape=(3, 1)))
out = C.times(W, X) + b
out.tag = 'output'
ce = C.cross_entropy_with_softmax(y, out)
ce.name = criterion_name
ce.tag = 'criterion'
eval = C.ops.square_error(y, out)
eval.tag = 'eval'
eval.name = eval_name
# training data readers
train_reader = C.CNTKTextFormatReader(train_file, randomize=None)
# testing data readers
test_reader = C.CNTKTextFormatReader(test_file, randomize=None)
my_sgd = C.SGDParams(epoch_size=0,
minibatch_size=25,
learning_rates_per_mb=0.1,
max_epochs=3)
with C.LocalExecutionContext('logreg') as ctx:
ctx.device_id = device_id
ctx.train(root_nodes=[ce, eval],
training_params=my_sgd,
input_map=train_reader.map(X, alias='I',
dim=2).map(y, alias='L', dim=3))
result = ctx.test(root_nodes=[ce, eval],
input_map=test_reader.map(X, alias='I',
dim=2).map(y,
alias='L',
dim=3))
return result
def linear_units(input_var, output_dim):
input_dim = input_var.shape[0]
# Introduce model parameters
weight_param = C.parameter(shape=(output_dim, input_dim), name="weights")
bias_param = C.parameter(shape=(output_dim, 1), name="biases")
# Reshape to facilitate matrix multiplication
input_reshaped = C.reshape(input_var, (input_dim, 1))
# Weighted sums
params['w'], params['b'] = weight_param, bias_param
part1 = C.times(weight_param, input_reshaped)
# Add biases
part2 = part1 + bias_param
# Return 1-D representation
return C.reshape(part2, (num_classes))
def test_input_without_dynamic_axes():
x = C.input_variable(shape=(2,), dynamic_axes=[], needs_gradient=True, name='x')
assert len(x.dynamic_axes) == 0
op = x * .01 + 3.0
grad_result, eval_result = op.grad({x : np.asarray([.6, -.8], dtype=np.float32)}, outputs=[op], wrt=[x])
assert np.allclose(eval_result, [3.006, 2.992])
assert np.allclose(grad_result, [.01, .01])
w = C.parameter(init=np.asarray([[0.5], [-1.5]], dtype=np.float32))
op = C.times(x, w) + 3.0
grad_result, eval_result = op.grad({x : np.asarray([.6, -.8], dtype=np.float32)}, outputs=[op], wrt=[w])
assert np.allclose(eval_result, [4.5])
assert np.allclose(grad_result, [[.6], [-.8]])
def test_gather_2D_using_one_hot_and_times():
i = C.sequence.input_variable((1, ))
indices = [[2, 0], [1]]
sparse_one_hot = C.one_hot(i, num_classes=3, sparse_output=True)
w = C.parameter((-1, 2, 3), init=C.glorot_uniform())
t = C.times(sparse_one_hot, w, output_rank=2)
result = t.eval({i: indices})
w_value = w.value
expected_result = [
np.stack(
[np.expand_dims(np.asarray(w_value[idx]), axis=0) for idx in seq])
for seq in indices
]
assert np.array_equal(result[0], expected_result[0])
assert np.array_equal(result[1], expected_result[1])
def test_eval_sparse_seq_1(batch, device_id):
dim = 4
multiplier = 2
for var_is_sparse in [True, False]:
in1 = sequence.input_variable(shape=(dim,), is_sparse=var_is_sparse)
z = times(in1, multiplier*np.eye(dim))
if isinstance(batch[0], list):
expected = [np.vstack([m.todense() * multiplier for m in seq]) for seq in
batch]
else:
expected = [seq.todense() * multiplier for seq in batch]
result = z.eval({in1: batch}, device=cntk_device(device_id))
assert np.all([np.allclose(a,b) for a,b in zip(result, expected)]), \
"%s != %s"%(result,expected)
def createAttentionNet(self, hiddenSrc, curHiddenTrg, srcLength):
srcHiddenSize = Config.SrcHiddenSize * 2
hsw = C.times(hiddenSrc, self.Was)
htw = C.times(curHiddenTrg, self.Wat)
hst = C.reshape(
hsw, shape=(srcLength, Config.BatchSize * Config.TrgHiddenSize)
) + C.reshape(htw, shape=(1, Config.BatchSize * Config.TrgHiddenSize))
hstT = C.reshape(C.tanh(hst),
shape=(srcLength * Config.BatchSize,
Config.TrgHiddenSize))
attScore = C.reshape(C.times(hstT, self.Wav),
shape=(srcLength, Config.BatchSize))
maskOut = (C.slice(self.maskMatrixSrc, 0, 0, srcLength) - 1) * 99999999
nAttScore = attScore + maskOut
attProb = C.reshape(C.softmax(nAttScore, axis=0),
shape=(srcLength, Config.BatchSize, 1))
attVector = hiddenSrc * attProb
contextVector = C.reduce_sum(C.reshape(
attVector, shape=(srcLength, Config.BatchSize * srcHiddenSize)),
axis=0)
contextVector = C.reshape(contextVector,
shape=(1, Config.BatchSize, srcHiddenSize))
return (contextVector, attProb)
def test_as_composite():
input_dim = 1
proj_dim = 2
x = C.input_variable((input_dim, ))
b = C.parameter((proj_dim))
w = C.parameter((input_dim, proj_dim))
func_name = 't_plus_b'
t_plus_b = C.plus(C.times(x, w), b, name=func_name)
assert (t_plus_b.root_function.name == func_name)
composite = C.as_composite(t_plus_b.root_function)
assert (composite.root_function.name == func_name)
composite = C.as_composite(composite)
assert (composite.root_function.name == func_name)
composite = C.as_composite(t_plus_b)
assert (composite.root_function.name == func_name)
def _simple_dict():
d = {}
d['i1'] = C.input_variable(shape=(2, 3), name='i1')
d['c1'] = C.constant(shape=(2, 3), value=6, name='c1')
d['p1'] = C.parameter(shape=(3, 2), init=7, name='p1')
d['op1'] = C.plus(d['i1'], d['c1'], name='op1')
d['op2'] = C.times(d['op1'], d['p1'], name='op2')
d['root'] = d['op2']
d['target'] = C.input_variable((), name='label')
d['all'] = C.combine([d['root'], C.minus(
d['target'], C.constant(1, name='c2'), name='minus')], name='all')
return d
def test_2d_sparse_csr_batch_input(device_id):
dev = cntk_device(device_id)
features = C.input_variable((2, 3), is_sparse=True)
w = C.parameter(init=np.asarray([[0.5, 1], [-.5, 2], [1., 1.5]],
dtype=np.float32),
device=dev)
t = C.times(features, w)
features_data = [
sp.sparse.csr_matrix(
np.asarray([[1., 0., 0.], [0., 1., 0.]], dtype=np.float32)),
sp.sparse.csr_matrix(
np.asarray([[0., 0., 1.], [1., 0., 0.]], dtype=np.float32))
]
result = t.eval({features: features_data}, device=dev)
assert np.array_equal(result, [[[.5, 1], [-.5, 2]], [[1, 1.5], [.5, 1]]])
def test_free_static_axis_times_free_static_axis(output_rank, x_input_shape,
x_data, y_input_shape,
y_data):
x = C.input_variable(x_input_shape)
y = C.input_variable(y_input_shape)
t = C.times(x, y, output_rank=output_rank)
cntk_result = t.eval({x: x_data, y: y_data})[0]
np_result = []
for x_item, y_item in zip(x_data, y_data): #zip over the batch axis
item_res = np.tensordot(x_item,
y_item,
axes=len(x_item.shape) - output_rank)
np_result.append(item_res)
np_result = np.vstack(np_result)
np.testing.assert_allclose(np_result, cntk_result)
def cumsum(x, axis=0):
dim = x.shape[axis]
print('dim')
print(dim)
U = C.constant(np.triu(np.ones((dim, dim))).astype(x.dtype))
print('U')
print(U)
if axis != -1:
x = C.swapaxes(x, -1, axis)
print('swapped')
print(x())
out = C.times(x, U)
if axis != -1:
out = C.swapaxes(out, -1, axis)
return out
def test_unpack_axis_times_transpose_unpack_axis(output_rank, x_input_shape,
x_data, y_input_shape,
y_data):
#test free axis times from unpack batch
x = C.input_variable(x_input_shape)
y = C.input_variable(y_input_shape)
xx = C.unpack_batch(x)
yy = C.unpack_batch(y)
yyy = C.transpose(yy, range(len(yy.shape))[::-1])
t = C.times(xx, yyy, output_rank=output_rank)
cntk_result = t.eval({x: x_data, y: y_data})
np_result = np.tensordot(x_data,
np.transpose(y_data),
axes=len(x_data.shape) - output_rank)
np.testing.assert_allclose(np_result, cntk_result)
def test_op_times_sparse_grad(device_id, precision):
dt_precision = PRECISION_TO_TYPE[precision]
from cntk import times, times_transpose, parameter, reshape, one_hot
dim = 5
num_sequences = 2
seq = [i for i in range(dim)]
identity = np.identity(dim, dtype=np.float32)
input_data = one_hot([seq] * num_sequences, dim)
input_var = I(shape=(dim), is_sparse=True, needs_gradient=False)
e = parameter(shape=(dim, dim), init=identity)
z = reshape(times_transpose(e, times(input_var, e)), dim)
e_grad = z.grad({input_var: input_data}, [e])
assert np.allclose(e_grad, np.ones((dim, dim)) * 4)
def scale_dot_product_attention_block(self, contextQ, contextV, contextK, name):
Q = C.placeholder(shape=(2*self.hidden_dim,), dynamic_axes=[self.b_axis, self.q_axis])
V = C.placeholder(shape=(2*self.hidden_dim,), dynamic_axes=[self.b_axis, self.q_axis])
K = C.placeholder(shape=(2*self.hidden_dim,), dynamic_axes=[self.b_axis, self.q_axis])
Ql = C.layers.Dense(100)(Q)
Vl = C.layers.Dense(100)(V)
Kl = C.layers.Dense(100)(K)
kvw, kvw_mask = C.sequence.unpack(Kl, padding_value=0).outputs
vvw, _ = C.sequence.unpack(Vl, padding_value=0).outputs
KT = C.swapaxes(kvw)
S = C.reshape(C.times(Ql, KT)/math.sqrt(100), -1)
kvw_mask_expanded = C.sequence.broadcast_as(kvw_mask, Ql)
S = C.softmax(C.element_select(kvw_mask_expanded, S, C.constant(-1e+30)))
att = C.times(S, vvw)
return C.as_block(
att,
[(Q, contextQ), (V, contextV), (K, contextK)],
'sdp_attention_block' + name,
'sdp_attention_block' + name)
def rnet_output_layer(self, attention_context, query):
att_context = C.placeholder(shape=(2*self.hidden_dim,))
q_processed = C.placeholder(shape=(2*self.hidden_dim,))
wuq = C.parameter(shape=(2*self.hidden_dim, 2*self.hidden_dim), init=C.glorot_uniform())
whp = C.parameter(shape=(2*self.hidden_dim, 2*self.hidden_dim), init=C.glorot_uniform())
wha = C.parameter(shape=(2*self.hidden_dim, 2*self.hidden_dim), init=C.glorot_uniform())
v = C.parameter(shape=(2*self.hidden_dim, 1), init=C.glorot_uniform())
bias = C.parameter(shape=(2*self.hidden_dim), init=C.glorot_uniform())
whp_end = C.parameter(shape=(2*self.hidden_dim, 2*self.hidden_dim), init=C.glorot_uniform())
wha_end = C.parameter(shape=(2*self.hidden_dim, 2*self.hidden_dim), init=C.glorot_uniform())
v_end = C.parameter(shape=(2*self.hidden_dim, 1), init=C.glorot_uniform())
# sequence[tensor[1]] q_len x 1
s0 = C.times(C.tanh(C.times(q_processed, wuq) + bias), v)
a0 = C.sequence.softmax(s0)
rQ = C.sequence.reduce_sum(a0 * q_processed)
# sequence[tensor[1]] plen x 1
ts = C.reshape(C.times(C.tanh(
C.times(att_context, whp) + C.times(C.sequence.broadcast_as(rQ, att_context), wha)), v), (-1))
# sequence[tensor[1]]
ta = C.sequence.softmax(ts)
# sequence[2d] 1 x 2d
c0 = C.reshape(C.sequence.reduce_sum(ta * att_context), (2*self.hidden_dim))
# sequence[tensor[2d]]
ha1 = C.layers.blocks.GRU(2*self.hidden_dim)(rQ, c0)
# sequence[tensor[1]] plen x 1
s1 = C.reshape(C.times(C.tanh(C.times(att_context, whp_end) + C.times(
C.sequence.broadcast_as(ha1, att_context), wha_end)), v_end), (-1))
# sequence[tensor[1]] plen x 1
a1 = C.sequence.softmax(s1)
return C.as_block(
C.combine([ts, s1]),
[(att_context, attention_context), (q_processed, query)],
'output_layer',
'output_layer')