def construct_model(params, datasets, filter_hs=[3, 4, 5], batch_size=200):
rng = np.random.RandomState(1234)
input_height = len(datasets[0][0]) - 2
input_width = params["embedding"].shape[1]
filter_shapes = [p[0].shape for p in params["convs"]]
pool_sizes = [(input_height - s[2] + 1, input_width - s[3] + 1)
for s in filter_shapes]
param_sizes = {
"input_height": input_height,
"input_width": input_width,
"filter_shapes": filter_shapes,
"pool_sizes": pool_sizes
}
print "Param sizes: ", param_sizes
index = T.iscalar()
x = T.matrix('x')
y = T.ivector('y')
print '....Construct model'
word_embedding = params["embedding"]
words = shared(word_embedding, name='embedding')
layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape(\
(x.shape[0], 1, x.shape[1], words.shape[1]))
# construct layers
conv_layers = []
conv_params = params["convs"]
layer1_inputs = []
for i, filter_h in enumerate(filter_hs):
filter_shape = filter_shapes[i]
pool_size = pool_sizes[i]
conv_W = shared(value=np.asarray(conv_params[i][0],
dtype=theano.config.floatX),
borrow=True,
name='conv_W')
conv_b = shared(value=np.asarray(conv_params[i][1],
dtype=theano.config.floatX),
borrow=True,
name='conv_b')
conv_layer = nn.ConvPoolLayer(rng,
input=layer0_input,
input_shape=(batch_size, 1, input_height,
input_width),
filter_shape=filter_shape,
pool_size=pool_size,
activation=ReLU,
W=conv_W,
b=conv_b)
conv_layers.append(conv_layer)
layer1_input = conv_layer.output.flatten(2)
layer1_inputs.append(layer1_input)
layer1_input = T.concatenate(layer1_inputs, 1)
# population classifier
pop_hidden_units = [300, 13]
clf_w, clf_b = params["clf"]
Ws = [
shared(value=np.asarray(clf_w, dtype=theano.config.floatX),
borrow=True,
name='logis_w')
]
bs = [
shared(value=np.asarray(clf_b, dtype=theano.config.floatX),
borrow=True,
name='logis_b')
]
pop_classifier = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=pop_hidden_units,
dropout_rates=[0.5],
activations=[ReLU],
Ws=Ws,
bs=bs)
pop_loss = pop_classifier.errors(y)
pop_pred = pop_classifier.preds
# construct data set
if datasets[0].shape[0] % batch_size > 0:
extra_data_num = batch_size - datasets[0].shape[0] % batch_size
train_set = np.random.permutation(datasets[0])
extra_data = train_set[:extra_data_num]
new_data = np.append(datasets[0], extra_data, axis=0)
else:
new_data = dataset[0]
new_data = np.random.permutation(new_data)
n_batches = new_data.shape[0] / batch_size
n_train_batches = int(np.round(n_batches * 0.9))
train_set = new_data[:n_train_batches * batch_size, :]
train_set_x = theano.shared(np.asarray(train_set[:, :input_height],
dtype=theano.config.floatX),
borrow=True)
train_set_pop_y = T.cast(
theano.shared(np.asarray(train_set[:, -2], dtype=theano.config.floatX),
borrow=True), 'int32')
print '...construct test function'
test_fn = function(
inputs=[index],
outputs=[pop_loss, pop_pred],
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_pop_y[index * batch_size:(index + 1) * batch_size]
})
results = [test_fn(i) for i in xrange(n_train_batches)]
pop_losses = [r[0] for r in results]
pop_train_perf = 1 - np.mean(pop_losses)
pop_predictions = np.concatenate([r[1] for r in results])
rs = {}
rs["pop_preds"] = list(pop_predictions)
rs["pop_truth"] = list(map(int, train_set[:, -2]))
print "Population Train Performance %f" % pop_train_perf
return rs
def run_cnn(exp_name,
dataset,
embedding,
log_fn,
perf_fn,
k=0,
emb_dm=100,
batch_size=100,
filter_hs=[1, 2, 3],
hidden_units=[200, 100, 11],
dropout_rate=0.5,
shuffle_batch=True,
n_epochs=300,
lr_decay=0.95,
activation=ReLU,
sqr_norm_lim=9,
non_static=True,
print_freq=5):
"""
Train and Evaluate CNN event encoder model
:dataset: list containing three elements[(train_x, train_y),
(valid_x, valid_y), (test_x, test_y)]
:embedding: word embedding with shape (|V| * emb_dm)
:filter_hs: filter height for each paralle cnn layer
:dropout_rate: dropout rate for full connected layers
:n_epochs: the max number of iterations
"""
start_time = timeit.default_timer()
rng = np.random.RandomState(1234)
input_height = len(dataset[0][0][0][0])
num_sens = len(dataset[0][0][0])
print "--input height ", input_height
num_maps = hidden_units[0]
###################
# start snippet 1 #
###################
print "start to construct the model ...."
word_x = T.tensor3("word_x")
freq_x = T.tensor3("freq_x")
pos_x = T.tensor3("pos_x")
sent_x = T.matrix("sent_x")
y_event = T.ivector("y_event")
words = shared(value=np.asarray(embedding, dtype=theano.config.floatX),
name="embedding",
borrow=True)
sym_dim = 20
# the frequency embedding is 21 * sym_dim matrix
freq_val = np.random.random((21, sym_dim)).astype(theano.config.floatX)
freqs = shared(value=freq_val, borrow=True, name="freqs")
pos_val = np.random.random((21, sym_dim)).astype(theano.config.floatX)
poss = shared(value=pos_val, borrow=True, name="poss")
# define function to keep padding vector as zero
zero_vector_tensor = T.vector()
zero_vec = np.zeros(emb_dm, dtype=theano.config.floatX)
set_zero = function([zero_vector_tensor],
updates=[(words,
T.set_subtensor(words[0, :],
zero_vector_tensor))])
freq_zero_tensor = T.vector()
freq_zero_vec = np.zeros(sym_dim, dtype=theano.config.floatX)
freq_set_zero = function([freq_zero_tensor],
updates=[(freqs,
T.set_subtensor(freqs[0, :],
freq_zero_tensor))])
pos_zero_tensor = T.vector()
pos_zero_vec = np.zeros(sym_dim, dtype=theano.config.floatX)
pos_set_zero = function([pos_zero_tensor],
updates=[(poss,
T.set_subtensor(poss[0, :],
pos_zero_tensor))])
word_x_emb = words[T.cast(word_x.flatten(), dtype="int32")].reshape(
(word_x.shape[0] * word_x.shape[1], 1, word_x.shape[2], emb_dm))
freq_x_emb = freqs[T.cast(freq_x.flatten(), dtype="int32")].reshape(
(freq_x.shape[0] * freq_x.shape[1], 1, freq_x.shape[2], sym_dim))
pos_x_emb = poss[T.cast(pos_x.flatten(), dtype="int32")].reshape(
(pos_x.shape[0] * pos_x.shape[1], 1, pos_x.shape[2], sym_dim))
layer0_input = T.concatenate([word_x_emb, freq_x_emb, pos_x_emb], axis=3)
conv_layers = []
layer1_inputs = []
for i in xrange(len(filter_hs)):
filter_shape = (num_maps, 1, filter_hs[i], emb_dm + sym_dim + sym_dim)
pool_size = (input_height - filter_hs[i] + 1, 1)
conv_layer = nn.ConvPoolLayer(rng,
input=layer0_input,
input_shape=None,
filter_shape=filter_shape,
pool_size=pool_size,
activation=activation)
sen_vecs = conv_layer.output.reshape(
(word_x.shape[0], 1, word_x.shape[1], num_maps))
# construct multi-layer sentence vectors
conv_layers.append(conv_layer)
layer1_inputs.append(sen_vecs)
sen_vec = T.concatenate(layer1_inputs, 3)
# score the sentences
theta_value = np.random.random((len(filter_hs) * num_maps, 1))
theta = shared(value=np.asarray(theta_value, dtype=theano.config.floatX),
name="theta",
borrow=True)
weighted_sen_vecs, sen_score = keep_max(sen_vec, theta, k, sent_x)
sen_score_cost = T.mean(T.sum(sen_score, axis=2).flatten(1))
doc_vec = T.sum(weighted_sen_vecs, axis=2)
layer1_input = doc_vec.flatten(2)
final_sen_score = sen_score.flatten(2)
##############
# classifier pop#
##############
params = []
for conv_layer in conv_layers:
params += conv_layer.params
params.append(theta)
params.append(words)
params.append(freqs)
params.append(poss)
gamma = as_floatX(0.001)
beta1 = as_floatX(0.000)
beta2 = as_floatX(0.000)
total_cost = gamma * sen_score_cost
total_dropout_cost = gamma * sen_score_cost
print "Construct classifier ...."
hidden_units[0] = num_maps * len(filter_hs)
model = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=hidden_units,
dropout_rates=[dropout_rate],
activations=[activation])
params += model.params
cost = model.negative_log_likelihood(y_event)
dropout_cost = model.dropout_negative_log_likelihood(y_event)
total_cost += cost + beta1 * model.L1
total_dropout_cost += dropout_cost + beta1 * model.L1
# using adagrad
total_grad_updates = sgd_updates_adadelta(params, total_dropout_cost,
lr_decay, 1e-6, sqr_norm_lim)
total_preds = model.preds
#####################
# Construct Dataset #
#####################
print "Copy data to GPU and constrct train/valid/test func"
train_word_x, train_freq_x, train_pos_x, train_sent_x, train_event_y = shared_dataset(
dataset[0])
test_word_x, test_freq_x, test_pos_x, test_sent_x, test_event_y = shared_dataset(
dataset[1])
n_train_batches = int(np.ceil(1.0 * len(dataset[0][0]) / batch_size))
n_test_batches = int(np.ceil(1.0 * len(dataset[1][0]) / batch_size))
#####################
# Train model func #
#####################
index = T.iscalar()
train_func = function(
[index],
total_cost,
updates=total_grad_updates,
givens={
word_x: train_word_x[index * batch_size:(index + 1) * batch_size],
freq_x: train_freq_x[index * batch_size:(index + 1) * batch_size],
pos_x: train_pos_x[index * batch_size:(index + 1) * batch_size],
sent_x: train_sent_x[index * batch_size:(index + 1) * batch_size],
y_event:
train_event_y[index * batch_size:(index + 1) * batch_size],
})
test_pred = function(
[index],
total_preds,
givens={
word_x: test_word_x[index * batch_size:(index + 1) * batch_size],
freq_x: test_freq_x[index * batch_size:(index + 1) * batch_size],
pos_x: test_pos_x[index * batch_size:(index + 1) * batch_size],
sent_x: test_sent_x[index * batch_size:(index + 1) * batch_size]
})
test_sentence_est = function(
[index],
final_sen_score,
givens={
word_x: test_word_x[index * batch_size:(index + 1) * batch_size],
freq_x: test_freq_x[index * batch_size:(index + 1) * batch_size],
pos_x: test_pos_x[index * batch_size:(index + 1) * batch_size],
sent_x: test_sent_x[index * batch_size:(index + 1) * batch_size]
})
train_sentence_est = function(
[index],
final_sen_score,
givens={
word_x: train_word_x[index * batch_size:(index + 1) * batch_size],
freq_x: train_freq_x[index * batch_size:(index + 1) * batch_size],
pos_x: train_pos_x[index * batch_size:(index + 1) * batch_size],
sent_x: train_sent_x[index * batch_size:(index + 1) * batch_size]
})
# apply early stop strategy
patience = 100
patience_increase = 2
improvement_threshold = 1.005
n_test = len(dataset[1][0])
epoch = 0
best_params = None
best_validation_score = 0.
test_perf = 0
done_loop = False
log_file = open(log_fn, 'w')
print "Start to train the model....."
cpu_tst_event_y = np.asarray(dataset[1][4])
def compute_score(true_list, pred_list):
mat = np.equal(true_list, pred_list)
score = np.mean(mat)
return score
best_score = 0.0
while (epoch < n_epochs) and not done_loop:
start_time = timeit.default_timer()
epoch += 1
costs = []
for minibatch_index in np.random.permutation(range(n_train_batches)):
cost_epoch = train_func(minibatch_index)
costs.append(cost_epoch)
set_zero(zero_vec)
freq_set_zero(freq_zero_vec)
pos_set_zero(pos_zero_vec)
if epoch % 1 == 0:
# do test
test_event_preds = np.concatenate(
[test_pred(i) for i in xrange(n_test_batches)])
test_event_score = compute_score(cpu_tst_event_y, test_event_preds)
precision, recall, beta, support = precision_recall_fscore_support(
cpu_tst_event_y, test_event_preds, pos_label=1)
with open(
os.path.join(perf_fn,
"%s_%d.event_pred" % (exp_name, epoch)),
'w') as epf:
for p in test_event_preds:
epf.write("%d\n" % int(p))
message = "Epoch %d test event perf %f, precision [%f, %f], recall[%f %f] , f1[%f, %f], train cost %f" % (
epoch, test_event_score, precision[0], precision[1], recall[0],
recall[1], beta[0], beta[1], np.mean(costs))
evl_score = beta[1]
print message
log_file.write(message + "\n")
log_file.flush()
if (evl_score > best_score):
best_score = evl_score
# save the sentence score
test_sen_score = [
test_sentence_est(i) for i in xrange(n_test_batches)
]
score_file = "./results/%s_%d_test.score" % (exp_name, epoch)
with open(score_file, "wb") as sm:
cPickle.dump(test_sen_score, sm)
end_time = timeit.default_timer()
print "Finish one iteration using %f m" % (
(end_time - start_time) / 60.)
log_file.flush()
log_file.close()
def train_cnn_encoder(datasets,
word_embedding,
input_width=64,
filter_hs=[3, 4, 5],
hidden_units=[100, 2],
dropout_rate=[0.5],
shuffle_batch=True,
n_epochs=100,
batch_size=50,
lr_decay=0.95,
activations=[ReLU],
sqr_norm_lim=9,
non_static=True):
start_time = timeit.default_timer()
rng = np.random.RandomState(1234)
input_height = len(datasets[0][0]) - 2
filter_width = input_width
feature_maps = hidden_units[0]
filter_shapes = []
pool_sizes = []
for filter_h in filter_hs:
filter_shapes.append((feature_maps, 1, filter_h, filter_width))
pool_sizes.append(
(input_height - filter_h + 1, input_width - filter_width + 1))
parameters = [("Input Shape", input_height, input_width),
("Filter Shape", filter_shapes), ("Pool Sizes", pool_sizes),
("dropout rate", dropout_rate),
("hidden units", hidden_units),
("shuffle_batch", shuffle_batch), ("n_epochs", n_epochs),
("batch size", batch_size)]
print parameters
# construct the model
index = T.iscalar()
x = T.matrix("x")
y = T.ivector("y")
words = shared(value=word_embedding, name="embedding")
zero_vector_tensor = T.vector()
zero_vec = np.zeros(input_width, dtype=theano.config.floatX)
set_zero = function([zero_vector_tensor],
updates=[(words,
T.set_subtensor(words[0, :],
zero_vector_tensor))])
layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape(
(x.shape[0], 1, x.shape[1], words.shape[1]))
conv_layers = []
layer1_inputs = []
for i in xrange(len(filter_hs)):
filter_shape = filter_shapes[i]
pool_size = pool_sizes[i]
conv_layer = nn.ConvPoolLayer(rng,
input=layer0_input,
input_shape=(batch_size, 1, input_height,
input_width),
filter_shape=filter_shape,
pool_size=pool_size,
activation=ReLU)
layer1_input = conv_layer.output.flatten(2)
conv_layers.append(conv_layer)
layer1_inputs.append(layer1_input)
layer1_input = T.concatenate(layer1_inputs, 1)
###################
# Population Task #
###################
hidden_units[0] = feature_maps * len(filter_hs)
pop_classifier = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=hidden_units,
dropout_rates=dropout_rate,
activations=activations)
pop_params = pop_classifier.params
for conv_layer in conv_layers:
pop_params += conv_layer.params
if non_static:
pop_params.append(words)
pop_cost = pop_classifier.negative_log_likelihood(y)
pop_dropout_cost = pop_classifier.dropout_negative_log_likelihood(y)
pop_grad_updates = sgd_updates_adadelta(pop_params, pop_dropout_cost,
lr_decay, 1e-6, sqr_norm_lim)
###################
# EventType Task #
###################
event_type_hidden_units = [feature_maps * len(filter_hs), 12]
type_classifier = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=event_type_hidden_units,
dropout_rates=dropout_rate,
activations=activations)
type_params = type_classifier.params
for conv_layer in conv_layers:
type_params += conv_layer.params
if non_static:
type_params.append(words)
type_cost = type_classifier.negative_log_likelihood(y)
type_dropout_cost = type_classifier.dropout_negative_log_likelihood(y)
type_grad_updates = sgd_updates_adadelta(type_params, type_dropout_cost,
lr_decay, 1e-6, sqr_norm_lim)
######################
# Construct Data Set #
######################
np.random.seed(1234)
if datasets[0].shape[0] % batch_size > 0:
extra_data_num = batch_size - datasets[0].shape[0] % batch_size
train_set = np.random.permutation(datasets[0])
extra_data = train_set[:extra_data_num]
new_data = np.append(datasets[0], extra_data, axis=0)
else:
new_data = datasets[0]
new_data = np.random.permutation(new_data)
n_batches = new_data.shape[0] / batch_size
n_train_batches = int(np.round(n_batches * 0.9))
# divide the train set intp train/val sets
if datasets[1].shape[0] % batch_size > 0:
extra_data_num = batch_size - datasets[1].shape[0] % batch_size
test_set = np.random.permutation(datasets[1])
extra_data = test_set[:extra_data_num]
new_test_data = np.append(datasets[1], extra_data, axis=0)
else:
new_test_data = datasets[1]
test_set_x = new_test_data[:, :input_height]
test_set_pop_y = np.asarray(new_test_data[:, -2], "int32")
test_set_type_y = np.asarray(new_test_data[:, -1], "int32")
train_set = new_data[:n_train_batches * batch_size, :]
val_set = new_data[n_train_batches * batch_size:, :]
print train_set[:, -1]
borrow = True
train_set_x = theano.shared(np.asarray(train_set[:, :input_height],
dtype=theano.config.floatX),
borrow=borrow)
train_set_pop_y = T.cast(
theano.shared(np.asarray(train_set[:, -2], dtype=theano.config.floatX),
borrow=borrow), 'int32')
train_set_type_y = T.cast(
theano.shared(np.asarray(train_set[:, -1], dtype=theano.config.floatX),
borrow=borrow), 'int32')
val_set_x = theano.shared(np.asarray(val_set[:, :input_height],
dtype=theano.config.floatX),
borrow=borrow)
val_set_pop_y = T.cast(
theano.shared(np.asarray(val_set[:, -2], dtype=theano.config.floatX),
borrow=borrow), 'int32')
val_set_type_y = T.cast(
theano.shared(np.asarray(val_set[:, -1], dtype=theano.config.floatX),
borrow=borrow), 'int32')
n_val_batches = n_batches - n_train_batches
n_test_batches = test_set_x.shape[0] / batch_size
print 'n_test_batches: %d' % n_test_batches
# transform the data into shared varibale for GPU computing
test_set_x = theano.shared(np.asarray(test_set_x,
dtype=theano.config.floatX),
borrow=borrow)
test_set_pop_y = theano.shared(test_set_pop_y, borrow=True)
test_set_type_y = theano.shared(test_set_type_y, borrow=True)
####################
# Train Model Func #
####################
# population model
val_pop_model = function(
[index],
pop_classifier.errors(y),
givens={
x: val_set_x[index * batch_size:(index + 1) * batch_size],
y: val_set_pop_y[index * batch_size:(index + 1) * batch_size]
})
test_pop_model = function(
[index],
pop_classifier.errors(y),
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_pop_y[index * batch_size:(index + 1) * batch_size]
})
real_test_pop_model = function(
[index],
pop_classifier.errors(y),
givens={
x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_pop_y[index * batch_size:(index + 1) * batch_size]
})
train_pop_model = function(
[index],
pop_cost,
updates=pop_grad_updates,
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_pop_y[index * batch_size:(index + 1) * batch_size]
})
# event type model
val_type_model = function(
[index],
type_classifier.errors(y),
givens={
x: val_set_x[index * batch_size:(index + 1) * batch_size],
y: val_set_type_y[index * batch_size:(index + 1) * batch_size]
})
test_type_model = function(
[index],
type_classifier.errors(y),
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_type_y[index * batch_size:(index + 1) * batch_size]
})
real_test_type_model = function(
[index],
type_classifier.errors(y),
givens={
x: test_set_x[index * batch_size:(index + 1) * batch_size],
y: test_set_type_y[index * batch_size:(index + 1) * batch_size]
})
train_type_model = function(
[index],
type_cost,
updates=type_grad_updates,
givens={
x: train_set_x[index * batch_size:(index + 1) * batch_size],
y: train_set_type_y[index * batch_size:(index + 1) * batch_size]
})
"""
test_pred_layers = []
test_size = test_set_x.shape[0]
test_layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape((test_size, 1, input_height, input_width))
for conv_layer in conv_layers:
test_layer0_output = conv_layer.predict(test_layer0_input, test_size)
test_pred_layers.append(test_layer0_output.flatten(2))
test_layer1_input = T.concatenate(test_pred_layers, 1)
test_pop_y_pred = pop_classifier.predict(test_layer1_input)
test_pop_error = T.mean(T.neq(test_pop_y_pred, y))
test_pop_model_all = function([x, y], test_pop_error)
test_type_y_pred = type_classifier.predict(test_layer1_input)
test_type_error = T.mean(T.neq(test_type_y_pred, y))
test_type_model_all = function([x, y], test_type_error)
"""
# start to training the model
print "Start training the model...."
epoch = 0
best_pop_val_perf = 0
best_type_val_perf = 0
while (epoch < n_epochs):
epoch += 1
if shuffle_batch:
for minibatch_index in np.random.permutation(
range(n_train_batches)):
if minibatch_index % 10 == 0:
print minibatch_index
cost_pop_epoch = train_pop_model(minibatch_index)
set_zero(zero_vec)
cost_type_epoch = train_type_model(minibatch_index)
set_zero(zero_vec)
else:
for minibatch_index in xrange(n_train_batches):
cost_pop_epoch = train_pop_model(minibatch_index)
set_zero(zero_vec)
cost_type_epoch = train_type_model(minibatch_index)
set_zero(zero_vec)
train_pop_losses = [test_pop_model(i) for i in xrange(n_train_batches)]
train_pop_perf = 1 - np.mean(train_pop_losses)
train_type_losses = [
test_type_model(i) for i in xrange(n_train_batches)
]
train_type_perf = 1 - np.mean(train_type_losses)
val_pop_losses = [val_pop_model(i) for i in xrange(n_val_batches)]
val_pop_perf = 1 - np.mean(val_pop_losses)
val_type_losses = [val_type_model(i) for i in xrange(n_val_batches)]
val_type_perf = 1 - np.mean(val_type_losses)
print('epoch %i, train pop perf %f %%, val pop perf %f' %
(epoch, train_pop_perf * 100., val_pop_perf * 100.))
print('epoch %i, train type perf %f %%, val type perf %f' %
(epoch, train_type_perf * 100., val_type_perf * 100.))
if val_pop_perf >= best_pop_val_perf:
best_pop_val_perf = val_pop_perf
#test_pop_losses = test_pop_model_all(test_set_x, test_set_pop_y)
test_pop_losses = [
real_test_pop_model(i) for i in xrange(n_test_batches)
]
test_pop_perf = 1 - np.mean(test_pop_losses)
print "Test POP Performance %f under Current Best Valid perf %f" % (
test_pop_perf, val_pop_perf)
if val_type_perf >= best_type_val_perf:
best_type_val_perf = val_type_perf
#test_type_losses = test_type_model_all(test_set_x, test_set_type_y)
test_type_losses = [
real_test_type_model(i) for i in xrange(n_test_batches)
]
test_type_perf = 1 - np.mean(test_type_losses)
print "Test Type Performance %f under Current Best Valid perf %f" % (
test_type_perf, val_type_perf)
end_time = timeit.default_timer()
print "Epoch %d finish take time %fm " % (epoch,
(end_time - start_time) /
60.)
start_time = timeit.default_timer()
return test_pop_perf, test_type_perf
def run_cnn(exp_name,
dataset,
embedding,
log_fn,
perf_fn,
emb_dm=100,
batch_size=100,
filter_hs=[1, 2, 3],
hidden_units=[200, 100, 11],
dropout_rate=0.5,
shuffle_batch=True,
n_epochs=300,
lr_decay=0.95,
activation=ReLU,
sqr_norm_lim=9,
non_static=True,
sen_weight=False):
"""
Train and Evaluate CNN event encoder model
:dataset: list containing three elements[(train_x, train_y),
(valid_x, valid_y), (test_x, test_y)]
:embedding: word embedding with shape (|V| * emb_dm)
:filter_hs: filter height for each paralle cnn layer
:dropout_rate: dropout rate for full connected layers
:n_epochs: the max number of iterations
"""
start_time = timeit.default_timer()
rng = np.random.RandomState(1234)
input_height = len(dataset[0][0][0][0]) # number of words in the sentences
num_sens = len(dataset[0][0][0]) # number of sentences
print "--input height ", input_height
input_width = emb_dm
num_maps = hidden_units[0]
###################
# start snippet 1 #
###################
print "start to construct the model ...."
x = T.tensor3("x")
y = T.ivector("y")
words = shared(value=np.asarray(embedding, dtype=theano.config.floatX),
name="embedding",
borrow=True)
# define function to keep padding vector as zero
zero_vector_tensor = T.vector()
zero_vec = np.zeros(input_width, dtype=theano.config.floatX)
set_zero = function([zero_vector_tensor],
updates=[(words,
T.set_subtensor(words[0, :],
zero_vector_tensor))])
# the input for the sentence level conv layers
layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape(
(x.shape[0] * x.shape[1], 1, x.shape[2], emb_dm))
conv_layers = []
layer1_inputs = []
for i in xrange(len(filter_hs)):
filter_shape = (num_maps, 1, filter_hs[i], emb_dm)
pool_size = (input_height - filter_hs[i] + 1, 1)
conv_layer = nn.ConvPoolLayer(rng,
input=layer0_input,
input_shape=None,
filter_shape=filter_shape,
pool_size=pool_size,
activation=activation)
sen_vecs = conv_layer.output.reshape(
(x.shape[0], x.shape[1], num_maps))
sen_vecs = sen_vecs.dimshuffle(0, 2, 1)
# construct the weighted sentences
if sen_weight: # using sentence weight
#s_w = 1. / T.arange(1, x.shape[1] + 1)
s_w = T.arange(1, x.shape[1] + 1)
s_w = (1.0 * x.shape[0] - s_w) / T.sum(s_w)
sen_vecs = sen_vecs * s_w
# using max in each dimension to represent the document vec
doc_vec = T.sum(sen_vecs, axis=2).flatten(2)
layer1_inputs.append(doc_vec)
conv_layers.append(conv_layer)
"""
doc_filter_shape = (num_maps, 1, 2, num_maps)
doc_pool_size = (num_sens - 2 + 1, 1)
doc_conv_layer = nn.ConvPoolLayer(rng, input=sen_vecs,
input_shape=None,
filter_shape=doc_filter_shape,
pool_size=doc_pool_size,
activation=activation)
layer1_input = doc_conv_layer.output.flatten(2)
conv_layers.append(conv_layer)
conv_layers.append(doc_conv_layer)
layer1_inputs.append(layer1_input)
"""
layer1_input = T.concatenate(layer1_inputs, 1)
##############
# classifier #
##############
print "Construct classifier ...."
hidden_units[0] = num_maps * len(filter_hs)
model = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=hidden_units,
dropout_rates=[dropout_rate],
activations=[activation])
params = model.params
for conv_layer in conv_layers:
params += conv_layer.params
if non_static:
params.append(words)
cost = model.negative_log_likelihood(y)
dropout_cost = model.dropout_negative_log_likelihood(y)
grad_updates = sgd_updates_adadelta(params, dropout_cost, lr_decay, 1e-6,
sqr_norm_lim)
#####################
# Construct Dataset #
#####################
print "Copy data to GPU and constrct train/valid/test func"
np.random.seed(1234)
train_x, train_y = shared_dataset(dataset[0])
valid_x, valid_y = shared_dataset(dataset[1])
test_x, test_y = shared_dataset(dataset[2])
n_train_batches = int(np.ceil(1.0 * len(dataset[0][0]) / batch_size))
n_valid_batches = int(np.ceil(1.0 * len(dataset[1][0]) / batch_size))
n_test_batches = int(np.ceil(1.0 * len(dataset[2][0]) / batch_size))
#####################
# Train model func #
#####################
index = T.iscalar()
train_func = function(
[index],
cost,
updates=grad_updates,
givens={
x: train_x[index * batch_size:(index + 1) * batch_size],
y: train_y[index * batch_size:(index + 1) * batch_size]
})
valid_train_func = function(
[index],
cost,
updates=grad_updates,
givens={
x: valid_x[index * batch_size:(index + 1) * batch_size],
y: valid_y[index * batch_size:(index + 1) * batch_size]
})
train_pred = function(
[index],
model.preds,
givens={x: train_x[index * batch_size:(index + 1) * batch_size]})
valid_pred = function([index],
model.preds,
givens={
x:
valid_x[index * batch_size:(index + 1) *
batch_size],
})
test_pred = function([index],
model.preds,
givens={
x:
test_x[index * batch_size:(index + 1) *
batch_size],
})
# apply early stop strategy
patience = 100
patience_increase = 2
improvement_threshold = 1.005
n_valid = len(dataset[1][0])
n_test = len(dataset[2][0])
epoch = 0
best_params = None
best_validation_score = 0.
test_perf = 0
done_loop = False
log_file = open(log_fn, 'a')
print "Start to train the model....."
cpu_trn_y = np.asarray(dataset[0][1])
cpu_val_y = np.asarray(dataset[1][1])
cpu_tst_y = np.asarray(dataset[2][1])
def compute_score(true_list, pred_list):
mat = np.equal(true_list, pred_list)
score = np.mean(mat)
return score
best_test_score = 0.
while (epoch < n_epochs) and not done_loop:
start_time = timeit.default_timer()
epoch += 1
costs = []
for minibatch_index in np.random.permutation(range(n_train_batches)):
cost_epoch = train_func(minibatch_index)
costs.append(cost_epoch)
set_zero(zero_vec)
# do validatiovalidn
valid_cost = [
valid_train_func(i)
for i in np.random.permutation(xrange(n_valid_batches))
]
if epoch % 5 == 0:
# do test
test_preds = np.concatenate(
[test_pred(i) for i in xrange(n_test_batches)])
test_score = compute_score(cpu_tst_y, test_preds)
with open(os.path.join(perf_fn, "%s_%d.pred" % (exp_name, epoch)),
'w') as epf:
for p in test_preds:
epf.write("%d\n" % int(p))
message = "Epoch %d test perf %f" % (epoch, test_score)
print message
log_file.write(message + "\n")
log_file.flush()
# store the best model
if test_score > best_test_score:
best_test_score = test_score
# save the model
model_name = "%s_%d.model" % (exp_name, epoch)
with open(model_name, 'wb') as bm:
for p in params:
cPickle.dump(p.get_value(), bm)
end_time = timeit.default_timer()
print "Finish one iteration using %f m" % (
(end_time - start_time) / 60.)
log_file.flush()
log_file.close()
def run_cnn(exp_name,
dataset, embedding,
log_fn, perf_fn,
k=0,
emb_dm=100,
batch_size=100,
filter_hs=[1, 2, 3],
hidden_units=[200, 100, 11],
dropout_rate=0.5,
shuffle_batch=True,
n_epochs=300,
lr_decay=0.95,
activation=ReLU,
sqr_norm_lim=9,
non_static=True,
print_freq=5):
"""
Train and Evaluate CNN event encoder model
:dataset: list containing three elements[(train_x, train_y),
(valid_x, valid_y), (test_x, test_y)]
:embedding: word embedding with shape (|V| * emb_dm)
:filter_hs: filter height for each paralle cnn layer
:dropout_rate: dropout rate for full connected layers
:n_epochs: the max number of iterations
"""
start_time = timeit.default_timer()
rng = np.random.RandomState(1234)
input_height = len(dataset[0][0][0][0])
num_sens = len(dataset[0][0][0])
print "--input height ", input_height
input_width = emb_dm
num_maps = hidden_units[0]
###################
# start snippet 1 #
###################
print "start to construct the model ...."
x = T.tensor3("x")
y_type = T.ivector("y_type")
y_pop = T.ivector("y_pop")
words = shared(value=np.asarray(embedding,
dtype=theano.config.floatX),
name="embedding", borrow=True)
# define function to keep padding vector as zero
zero_vector_tensor = T.vector()
zero_vec = np.zeros(input_width, dtype=theano.config.floatX)
set_zero = function([zero_vector_tensor],
updates=[(words, T.set_subtensor(words[0,:], zero_vector_tensor))])
layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape((
x.shape[0] * x.shape[1], 1, x.shape[2], emb_dm
))
conv_layers = []
layer1_inputs = []
for i in xrange(len(filter_hs)):
filter_shape = (num_maps, 1, filter_hs[i], emb_dm)
pool_size = (input_height - filter_hs[i] + 1, 1)
conv_layer = nn.ConvPoolLayer(rng, input=layer0_input,
input_shape=None,
filter_shape=filter_shape,
pool_size=pool_size, activation=activation)
sen_vecs = conv_layer.output.reshape((x.shape[0], 1, x.shape[1], num_maps))
# construct multi-layer sentence vectors
conv_layers.append(conv_layer)
layer1_inputs.append(sen_vecs)
sen_vec = T.concatenate(layer1_inputs, 3)
# score the sentences
theta_value = np.random.random((len(filter_hs) * num_maps, 1))
theta = shared(value=np.asarray(theta_value, dtype=theano.config.floatX),
name="theta", borrow=True)
weighted_sen_vecs, sen_score = keep_max(sen_vec, theta, k)
doc_vec = T.max(weighted_sen_vecs, axis=2)
layer1_input = doc_vec.flatten(2)
final_sen_score = sen_score.flatten(2)
##############
# classifier pop#
##############
print "Construct classifier ...."
hidden_units[0] = num_maps * len(filter_hs)
model = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=hidden_units,
dropout_rates=[dropout_rate],
activations=[activation])
params = model.params
for conv_layer in conv_layers:
params += conv_layer.params
params.append(theta)
if non_static:
params.append(words)
cost = model.negative_log_likelihood(y_pop)
dropout_cost = model.dropout_negative_log_likelihood(y_pop)
#######################
# classifier Type #####
#######################
type_hidden_units = [num for num in hidden_units]
type_hidden_units[-1] = 5
type_model = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=type_hidden_units,
dropout_rates=[dropout_rate],
activations=[activation])
params += type_model.params
type_cost = type_model.negative_log_likelihood(y_type)
type_dropout_cost = type_model.dropout_negative_log_likelihood(y_type)
total_cost = cost + type_cost
total_dropout_cost = dropout_cost + type_dropout_cost
# using adagrad
lr = 0.01
"""
total_grad_updates = nn.optimizer(total_dropout_cost,
params,
lr,
method="adadelta"
)
"""
total_grad_updates = sgd_updates_adadelta(params,
total_dropout_cost,
lr_decay,
1e-6,
sqr_norm_lim)
total_preds = [model.preds, type_model.preds]
#####################
# Construct Dataset #
#####################
print "Copy data to GPU and constrct train/valid/test func"
np.random.seed(1234)
train_x, train_pop_y, train_type_y = shared_dataset(dataset[0])
test_x, test_pop_y, test_type_y = shared_dataset(dataset[1])
n_train_batches = int(np.ceil(1.0 * len(dataset[0][0]) / batch_size))
n_test_batches = int(np.ceil(1.0 * len(dataset[1][0]) / batch_size))
#####################
# Train model func #
#####################
index = T.iscalar()
train_func = function([index], total_cost, updates=total_grad_updates,
givens={
x: train_x[index*batch_size:(index+1)*batch_size],
y_pop: train_pop_y[index*batch_size:(index+1)*batch_size],
y_type:train_type_y[index*batch_size:(index+1)*batch_size]
})
test_pred = function([index], total_preds,
givens={
x:test_x[index*batch_size:(index+1)*batch_size],
})
test_sentence_est = function([index], final_sen_score,
givens={
x: test_x[index*batch_size:(index+1)*batch_size]
})
train_sentence_est = function([index], final_sen_score,
givens={
x: train_x[index*batch_size:(index+1)*batch_size]
})
# apply early stop strategy
patience = 100
patience_increase = 2
improvement_threshold = 1.005
n_test = len(dataset[1][0])
epoch = 0
best_params = None
best_validation_score = 0.
test_perf = 0
done_loop = False
log_file = open(log_fn, 'w')
print "Start to train the model....."
cpu_tst_pop_y = np.asarray(dataset[1][1])
cpu_tst_type_y = np.asarray(dataset[1][2])
def compute_score(true_list, pred_list):
mat = np.equal(true_list, pred_list)
score = np.mean(mat)
return score
total_score = 0.0
while (epoch < n_epochs) and not done_loop:
start_time = timeit.default_timer()
epoch += 1
costs = []
for minibatch_index in np.random.permutation(range(n_train_batches)):
cost_epoch = train_func(minibatch_index)
costs.append(cost_epoch)
set_zero(zero_vec)
if epoch % print_freq == 0:
# do test
test_pop_preds, test_type_preds = map(np.concatenate, zip(*[test_pred(i) for i in xrange(n_test_batches)]))
test_pop_score = compute_score(cpu_tst_pop_y, test_pop_preds)
test_type_score = compute_score(cpu_tst_type_y, test_type_preds)
with open(os.path.join(perf_fn, "%s_%d.pop_pred" % (exp_name, epoch)), 'w') as epf:
for p in test_pop_preds:
epf.write("%d\n" % int(p))
with open(os.path.join(perf_fn, "%s_%d.type_pred" % (exp_name, epoch)), 'w') as epf:
for p in test_type_preds:
epf.write("%d\n" % int(p))
message = "Epoch %d test pop perf %f, type perf %f" % (epoch, test_pop_score, test_type_score)
print message
log_file.write(message + "\n")
log_file.flush()
if ((test_pop_score + test_type_score) > total_score) or (epoch % 15 == 0):
total_score = test_pop_score + test_type_score
# save the sentence score
test_sen_score = [test_sentence_est(i) for i in xrange(n_test_batches)]
score_file = "./results/%s_%d_test.score" % (exp_name, epoch)
with open(score_file, "wb") as sm:
cPickle.dump(test_sen_score, sm)
train_sen_score = [train_sentence_est(i) for i in xrange(n_train_batches)]
score_file = "./results/%s_%d_train.score" % (exp_name, epoch)
with open(score_file, "wb") as sm:
cPickle.dump(train_sen_score, sm)
end_time = timeit.default_timer()
print "Finish one iteration using %f m" % ((end_time - start_time)/60.)
log_file.flush()
log_file.close()
def train_cnn_encoder(datasets, word_embedding, input_width=64,
filter_hs=[3, 4, 5],
hidden_units=[100, 2],
dropout_rate=[0.5],
shuffle_batch=True,
n_epochs=100,
batch_size=50,
lr_decay=0.95,
activations=[ReLU],
sqr_norm_lim=9,
non_static=True):
rng = np.random.RandomState(1234)
input_height = len(datasets[0][0]) - 1
filter_width = input_width
feature_maps = hidden_units[0]
filter_shapes = []
pool_sizes = []
for filter_h in filter_hs:
filter_shapes.append((feature_maps, 1, filter_h, filter_width))
pool_sizes.append((input_height-filter_h+1, input_width-filter_width+1))
parameters = [("Input Shape", input_height, input_width),
("Filter Shape", filter_shapes),
("Pool Sizes", pool_sizes),
("dropout rate", dropout_rate),
("hidden units", hidden_units),
("shuffle_batch", shuffle_batch),
("n_epochs", n_epochs),
("batch size", batch_size)]
print parameters
# construct the model
index = T.iscalar()
x = T.matrix("x")
y = T.ivector("y")
words = shared(value=word_embedding, name="embedding")
zero_vector_tensor = T.vector()
zero_vec = np.zeros(input_width)
set_zero = function([zero_vector_tensor], updates=[(words, T.set_subtensor(words[0,:], zero_vector_tensor))])
layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape((x.shape[0],1,x.shape[1],words.shape[1]))
conv_layers = []
layer1_inputs = []
for i in xrange(len(filter_hs)):
filter_shape = filter_shapes[i]
pool_size = pool_sizes[i]
conv_layer = nn.ConvPoolLayer(rng, input=layer0_input,
input_shape=(batch_size, 1, input_height, input_width),
filter_shape=filter_shape,
pool_size=pool_size, activation=ReLU)
layer1_input = conv_layer.output.flatten(2)
conv_layers.append(conv_layer)
layer1_inputs.append(layer1_input)
layer1_input = T.concatenate(layer1_inputs, 1)
hidden_units[0] = feature_maps * len(filter_hs)
classifier = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=hidden_units,
dropout_rates=dropout_rate,
activations=activations)
params = classifier.params
for conv_layer in conv_layers:
params += conv_layer.params
if non_static:
params.append(words)
cost = classifier.negative_log_likelihood(y)
dropout_cost = classifier.dropout_negative_log_likelihood(y)
grad_updates = sgd_updates_adadelta(params, dropout_cost, lr_decay, 1e-6, sqr_norm_lim)
np.random.seed(1234)
if datasets[0].shape[0] % batch_size > 0:
extra_data_num = batch_size - datasets[0].shape[0] % batch_size
train_set = np.random.permutation(datasets[0])
extra_data = train_set[:extra_data_num]
new_data = np.append(datasets[0], extra_data, axis=0)
else:
new_data = datasets[0]
new_data = np.random.permutation(new_data)
n_batches = new_data.shape[0]/batch_size
n_train_batches = int(np.round(n_batches*0.9))
# divide the train set intp train/val sets
test_set_x = datasets[1][:,:input_height]
test_set_y = np.asarray(datasets[1][:,-1], "int32")
train_set = new_data[:n_train_batches*batch_size,:]
val_set = new_data[n_train_batches*batch_size:,:]
print train_set[:,-1]
train_set_x, train_set_y = shared_dataset((train_set[:,:input_height],train_set[:,-1]))
val_set_x, val_set_y = shared_dataset((val_set[:,:input_height],val_set[:,-1]))
n_val_batches = n_batches - n_train_batches
val_model = function([index], classifier.errors(y),
givens={
x: val_set_x[index * batch_size: (index + 1) * batch_size],
y: val_set_y[index * batch_size: (index + 1) * batch_size]
})
test_model = function([index], classifier.errors(y),
givens={
x: train_set_x[index * batch_size: (index + 1) * batch_size],
y: train_set_y[index * batch_size: (index + 1) * batch_size]
})
train_model = function([index], cost, updates=grad_updates,
givens={
x: train_set_x[index*batch_size:(index+1)*batch_size],
y: train_set_y[index*batch_size:(index+1)*batch_size]
})
test_pred_layers = []
test_size = test_set_x.shape[0]
test_layer0_input = words[T.cast(x.flatten(), dtype="int32")].reshape((test_size, 1, input_height, input_width))
for conv_layer in conv_layers:
test_layer0_output = conv_layer.predict(test_layer0_input, test_size)
test_pred_layers.append(test_layer0_output.flatten(2))
test_layer1_input = T.concatenate(test_pred_layers, 1)
test_y_pred = classifier.predict(test_layer1_input)
test_error = T.mean(T.neq(test_y_pred, y))
test_model_all = function([x, y], test_error)
# start to training the model
print "Start training the model...."
epoch = 0
best_val_perf = 0
val_perf = 0
cost_epoch = 0
while(epoch < n_epochs):
epoch += 1
if shuffle_batch:
for minibatch_index in np.random.permutation(range(n_train_batches)):
print minibatch_index
cost_epoch = train_model(minibatch_index)
set_zero(zero_vec)
else:
for minibatch_index in xrange(n_train_batches):
cost_epoch = train_model(minibatch_index)
set_zero(zero_vec)
train_losses = [test_model(i) for i in xrange(n_train_batches)]
train_perf = 1 - np.mean(train_losses)
val_losses = [val_model(i) for i in xrange(n_val_batches)]
val_perf = 1 - np.mean(val_losses)
print('epoch %i, train perf %f %%, val perf %f' % (epoch, train_perf * 100., val_perf*100.))
if val_perf >= best_val_perf:
best_val_perf = val_perf
test_losses = test_model_all(test_set_x, test_set_y)
test_perf = 1 - test_losses
print "Test Performance %f under Current Best Valid perf %f" % (test_perf, val_perf)
return test_perf
def run_cnn(exp_name,
dataset,
embedding,
log_fn,
perf_fn,
emb_dm=100,
batch_size=100,
filter_hs=[1, 2, 3],
hidden_units=[200, 100, 11],
dropout_rate=0.5,
shuffle_batch=True,
n_epochs=300,
lr_decay=0.95,
activation=ReLU,
sqr_norm_lim=9,
non_static=True,
alpha=0.0001):
"""
Train and Evaluate CNN event encoder model
:dataset: list containing three elements[(train_x, train_y),
(valid_x, valid_y), (test_x, test_y)]
:embedding: word embedding with shape (|V| * emb_dm)
:filter_hs: filter height for each paralle cnn layer
:dropout_rate: dropout rate for full connected layers
:n_epochs: the max number of iterations
"""
start_time = timeit.default_timer()
input_height = len(dataset[0][0][0])
print "--input height ", input_height
input_width = emb_dm
num_maps = hidden_units[0]
###################
# start snippet 1 #
###################
print "start to construct the model ...."
word_x = T.matrix("word_x")
freq_x = T.matrix("freq_x")
pos_x = T.matrix("pos_x")
y = T.ivector("y")
words = shared(value=np.asarray(embedding, dtype=theano.config.floatX),
name="embedding",
borrow=True)
sym_dim = 20
# the frequency embedding is 21 * 50 matrix
freq_val = np.random.random((21, sym_dim))
freqs = shared(value=np.asarray(freq_val, dtype=theano.config.floatX),
borrow=True,
name="freqs")
# the position embedding is 31 * 50 matrix
poss_val = np.random.random((31, sym_dim))
poss = shared(value=np.asarray(poss_val, dtype=theano.config.floatX),
borrow=True,
name="poss")
# define function to keep padding vector as zero
zero_vector_tensor = T.vector()
zero_vec = np.zeros(input_width, dtype=theano.config.floatX)
set_zero = function([zero_vector_tensor],
updates=[(words,
T.set_subtensor(words[0, :],
zero_vector_tensor))])
freq_zero_tensor = T.vector()
freq_zero_vec = np.zeros(sym_dim, dtype=theano.config.floatX)
freq_set_zero = function([freq_zero_tensor],
updates=[(freqs,
T.set_subtensor(freqs[0, :],
freq_zero_tensor))])
pos_zero_tensor = T.vector()
pos_zero_vec = np.zeros(sym_dim, dtype=theano.config.floatX)
pos_set_zero = function([pos_zero_tensor],
updates=[(poss,
T.set_subtensor(poss[0, :],
pos_zero_tensor))])
word_x_emb = words[T.cast(word_x.flatten(), dtype="int32")].reshape(
(word_x.shape[0], 1, word_x.shape[1], emb_dm))
freq_x_emb = freqs[T.cast(freq_x.flatten(), dtype="int32")].reshape(
(freq_x.shape[0], 1, freq_x.shape[1], sym_dim))
pos_x_emb = poss[T.cast(pos_x.flatten(), dtype="int32")].reshape(
(pos_x.shape[0], 1, pos_x.shape[1], sym_dim))
layer0_input = T.concatenate([word_x_emb, freq_x_emb, pos_x_emb], axis=3)
conv_layers = []
layer1_inputs = []
rng = np.random.RandomState()
for i in xrange(len(filter_hs)):
filter_shape = (num_maps, 1, filter_hs[i], emb_dm + sym_dim + sym_dim)
pool_size = (input_height - filter_hs[i] + 1, 1)
conv_layer = nn.ConvPoolLayer(rng,
input=layer0_input,
input_shape=None,
filter_shape=filter_shape,
pool_size=pool_size,
activation=activation)
layer1_input = conv_layer.output.flatten(2)
conv_layers.append(conv_layer)
layer1_inputs.append(layer1_input)
layer1_input = T.concatenate(layer1_inputs, 1)
##############
# classifier #
##############
print "Construct classifier ...."
hidden_units[0] = num_maps * len(filter_hs)
model = nn.MLPDropout(rng,
input=layer1_input,
layer_sizes=hidden_units,
dropout_rates=[dropout_rate],
activations=[activation])
params = model.params
for conv_layer in conv_layers:
params += conv_layer.params
params.append(words)
params.append(freqs)
params.append(poss)
cost = model.negative_log_likelihood(y) + alpha * model.L2
dropout_cost = model.dropout_negative_log_likelihood(y) + alpha * model.L2
grad_updates = sgd_updates_adadelta(params, dropout_cost, lr_decay, 1e-6,
sqr_norm_lim)
#####################
# Construct Dataset #
#####################
print "Copy data to GPU and constrct train/valid/test func"
train_word_x, train_freq_x, train_pos_x, train_y = shared_dataset(
dataset[0])
test_word_x, test_freq_x, test_pos_x, test_y = shared_dataset(dataset[1])
n_train_batches = int(np.ceil(1.0 * len(dataset[0][0]) / batch_size))
n_test_batches = int(np.ceil(1.0 * len(dataset[1][0]) / batch_size))
#####################
# Train model func #
#####################
index = T.iscalar()
train_func = function(
[index],
cost,
updates=grad_updates,
givens={
word_x: train_word_x[index * batch_size:(index + 1) * batch_size],
freq_x: train_freq_x[index * batch_size:(index + 1) * batch_size],
pos_x: train_pos_x[index * batch_size:(index + 1) * batch_size],
y: train_y[index * batch_size:(index + 1) * batch_size]
})
test_pred = function(
[index],
model.preds,
givens={
word_x: test_word_x[index * batch_size:(index + 1) * batch_size],
freq_x: test_freq_x[index * batch_size:(index + 1) * batch_size],
pos_x: test_pos_x[index * batch_size:(index + 1) * batch_size]
})
# apply early stop strategy
patience = 100
patience_increase = 2
improvement_threshold = 1.005
n_test = len(dataset[1][0])
epoch = 0
best_params = None
best_validation_score = 0.
test_perf = 0
done_loop = False
log_file = open(log_fn, 'a')
print "Start to train the model....."
cpu_trn_y = np.asarray(dataset[0][3])
cpu_tst_y = np.asarray(dataset[1][3])
def compute_score(true_list, pred_list):
mat = np.equal(true_list, pred_list)
score = np.mean(mat)
return score
while (epoch < n_epochs) and not done_loop:
start_time = timeit.default_timer()
epoch += 1
costs = []
for minibatch_index in np.random.permutation(range(n_train_batches)):
cost_epoch = train_func(minibatch_index)
costs.append(cost_epoch)
set_zero(zero_vec)
freq_set_zero(freq_zero_vec)
pos_set_zero(pos_zero_vec)
if epoch % 5 == 0:
# do test
test_preds = np.concatenate(
[test_pred(i) for i in xrange(n_test_batches)])
test_score = compute_score(cpu_tst_y, test_preds)
with open(os.path.join(perf_fn, "%s_%d.pred" % (exp_name, epoch)),
'w') as epf:
for p in test_preds:
epf.write("%d\n" % int(p))
message = "Epoch %d test perf %f with train cost %f" % (
epoch, test_score, np.mean(costs))
print message
log_file.write(message + "\n")
log_file.flush()
end_time = timeit.default_timer()
print "Finish one iteration using %f m" % (
(end_time - start_time) / 60.)
log_file.flush()
log_file.close()