def evaluate_network_from_embs(self, wembs, renew=True):
params = self.params
if renew:
dy.renew_cg()
builders = params["builders"]
W = params["W"]
v = params["v"]
lstms = [b.initial_state() for b in builders]
# wembs = [dy.noise(we, 0.1) for we in wembs]
# running the first level for getting b
fw_lstm1 = lstms[0].transduce(wembs)
bw_lstm1 = reversed(lstms[1].transduce(reversed(wembs)))
inputs_to_2nd_layer = [
dy.concatenate([f, b]) for f, b in zip(fw_lstm1, bw_lstm1)
]
fw_lstm2 = lstms[2].transduce(inputs_to_2nd_layer)
bw_lstm2 = reversed(lstms[3].transduce(reversed(inputs_to_2nd_layer)))
y = [dy.concatenate([f, b]) for f, b in zip(fw_lstm2, bw_lstm2)]
tags_hat = [W * t + v for t in y]
return tags_hat
def do_cpu(): C.renew_cg() W = C.parameter(cpW) W = W*W*W*W*W*W*W z = C.squared_distance(W,W) z.value() z.backward()
def predict(self, task, inputs):
preds = []
for input in inputs:
dn.renew_cg()
out = self(task, input)
preds.append(np.argmax(out.npvalue()))
return preds
def build_representations_bi(self,
sentence,
training,
prefix=[],
do_not_renew=False):
if not do_not_renew:
dy.renew_cg(immediate_compute=True, check_validity=True)
coded_sentence = self.vocabulary.code_sentence_cw(sentence, training)
coded_prefix = self.vocabulary.code_sentence_cw(prefix, training)
w_init_f = self.wrnn[F].initial_state()
w_init_b = self.wrnn[B].initial_state()
f_lstm_input = self.get_static_representations(coded_prefix +
coded_sentence)
b_lstm_input = self.get_static_representations(
coded_prefix + list(reversed(coded_sentence)))
contextual_embeddings = [
w_init_f.transduce(f_lstm_input),
list(reversed(w_init_b.transduce(b_lstm_input)))
]
return (dy.concatenate([
contextual_embeddings[F][-1], contextual_embeddings[B][0]
]), [dy.concatenate(list(fb)) for fb in zip(*contextual_embeddings)])
def predict(self, X_test, x_y_vectors=None):
"""
Predict the classification of the test set
"""
model = self.model
model_parameters = self.model_parameters
builder = self.builder
test_pred = []
# Predict every 100 instances together
for chunk in xrange(0, len(X_test), MINIBATCH_SIZE):
dy.renew_cg()
path_cache = {}
test_pred.extend([
np.argmax(
process_one_instance(
builder,
model,
model_parameters,
path_set,
path_cache,
self.update,
dropout=0.0,
x_y_vectors=x_y_vectors[chunk + i]
if x_y_vectors is not None else None,
num_hidden_layers=self.num_hidden_layers).npvalue())
for i, path_set in enumerate(X_test[chunk:chunk +
MINIBATCH_SIZE])
])
return test_pred
def predict_with_score(self, X_test, x_y_vectors=None):
"""
Predict the classification of the test set
"""
model = self.model
builder = self.builder
dy.renew_cg()
path_cache = {}
test_pred = [
process_one_instance(
builder,
model,
path_set,
path_cache,
self.update,
dropout=0.0,
x_y_vectors=x_y_vectors[i]
if x_y_vectors is not None else None,
num_hidden_layers=self.num_hidden_layers).npvalue()
for i, path_set in enumerate(X_test)
]
return [(np.argmax(vec), vec[np.argmax(vec)]) for vec in test_pred]
def epoch_train(self,examples):
count=0
dy.renew_cg()
current_losses = [ ]
loss_list = []
for word,context in (examples):
loss = self.get_score(word,context)
current_losses.append(loss)
loss_list.append(loss.value())
if len(current_losses) >= self.batch_size:
mean_loss = dy.esum(current_losses) / float(len(current_losses))
mean_loss.forward()
mean_loss.backward()
self.optimizer.update()
current_losses = [ ]
dy.renew_cg()
count+=1
## Print out the average loss in every 1M example
if count%1000000==1000:
print (count,np.mean(np.array(loss_list)))
loss_list = []
if current_losses:
mean_loss = dy.esum(current_losses) / float(len(current_losses))
mean_loss.forward()
mean_loss.backward()
self.optimizer.update()
def predict(board_ins, board_init):
act = []
count = 0
previous = None
first = True
for sentence, env in zip(board_ins, board_init):
if count % 5 != 0:
new_sentence = pre_sentence + ' <end> ' + sentence
new_env = str(execute(new_env, generate))
if new_env == 'None':
new_env = '1:_ 2:_ 3:_ 4:_ 5:_ 6:_ 7:_'
else:
dy.renew_cg()
new_sentence = sentence
new_env = env
generate, previous = generator(encoder, decoder, params_encoder,
params_decoder, new_sentence, new_env,
first, previous)
act.append(generate)
pre_sentence = sentence
count += 1
while '<end>' in generate:
generate.remove('<end>')
env_list = []
final_env_list = []
for i, env in enumerate(board_init):
if i % 5 == 0:
new_env = env
new_env = str(execute(new_env, act[i]))
if new_env == 'None':
new_env = '1:_ 2:_ 3:_ 4:_ 5:_ 6:_ 7:_'
env_list.append(new_env)
if i % 5 == 4:
final_env_list.append(new_env)
return env_list, final_env_list
def compute_batch_loss(encoder, decoder, batch_input_seqs, batch_output_seqs,
y2int):
# renew computation graph per batch
dn.renew_cg()
batch_size = len(batch_input_seqs)
# encode batch with bilstm encoder: each element represents one step in time, and is a matrix of 2*h x batch size
# for example, for sentence length of 12, blstm_outputs wil be: 12 x 2 x 100 x 16
# note: also adding begin_seq, end_seq symbols here!
encoded_inputs, input_masks = encoder.encode_batch(batch_input_seqs)
# concatenate the end seq symbols to the output sequence
padded_batch_output_seqs = [
seq + [common.END_SEQ] for seq in batch_output_seqs
]
# get output word ids for each step of the decoder
output_word_ids, output_masks, output_tot = common.get_batch_word_ids(
padded_batch_output_seqs, y2int)
total_batch_loss = decoder.compute_decoder_batch_loss(
encoded_inputs, input_masks, output_word_ids, output_masks, batch_size)
return total_batch_loss
def get_output(self, sents):
dy.renew_cg()
tagged_sents = []
for sent in sents:
features, t_feats, _ = self.get_features_for_tagging(sent, False)
cur_tag_seq, _ = self.crf_module.viterbi_decoding(features, t_feats)
tagged_sents.append(cur_tag_seq)
return tagged_sents
def predict(self,
feature_vector,
task_ids,
train=False,
soft_labels=False,
temperature=None,
dropout_rate=0.0,
orthogonality_weight=0.0,
domain_id=None):
dynet.renew_cg() # new graph
feature_vector = feature_vector.toarray()
feature_vector = np.squeeze(feature_vector, axis=0)
# self.input = dynet.vecInput(self.vocab_size)
# self.input.set(feature_vector)
# TODO this takes too long; can we speed this up somehow?
input = dynet.inputVector(feature_vector)
for i in range(self.h_layers):
if train: # add some noise
input = dynet.noise(input, self.noise_sigma)
input = dynet.dropout(input, dropout_rate)
input = self.layers[i](input)
outputs = []
for task_id in task_ids:
output = self.output_layers_dict[task_id](input,
soft_labels=soft_labels,
temperature=temperature)
outputs.append(output)
constraint, adv_loss = 0, 0
if orthogonality_weight != 0:
# put the orthogonality constraint either directly on the
# output layer or on the hidden layer if it's an MLP
F0_layer = self.output_layers_dict["F0"]
F1_layer = self.output_layers_dict["F1"]
F0_param = F0_layer.W_mlp if self.add_hidden else F0_layer.W
F1_param = F1_layer.W_mlp if self.add_hidden else F1_layer.W
F0_W = dynet.parameter(F0_param)
F1_W = dynet.parameter(F1_param)
# calculate the matrix product of the task matrix with both others
matrix_product = dynet.transpose(F0_W) * F1_W
# take the squared Frobenius norm by squaring
# every element and then summing them
squared_frobenius_norm = dynet.sum_elems(
dynet.square(matrix_product))
constraint += squared_frobenius_norm
# print('Constraint with first matrix:', squared_frobenius_norm.value())
if domain_id is not None:
# flip the gradient when back-propagating through here
adv_input = dynet.flip_gradient(input) # last state
adv_output = self.adv_layer(adv_input)
adv_loss = self.pick_neg_log(adv_output, domain_id)
# print('Adversarial loss:', avg_adv_loss.value())
return outputs, constraint, adv_loss
def generate(self, num, limit=40, beam=3):
dy.renew_cg()
generated = []
W = dy.parameter(self.W)
b = dy.parameter(self.b)
for wordi in range(num):
# Initialize the LSTM state with EOW token.
start_state = self.lstm.initial_state()
start_state = start_state.add_input(self.lookup[self.c2i[EOW]])
best_states = [('', start_state, 0)]
final_hypotheses = []
# Perform beam search.
while len(final_hypotheses) < beam and len(best_states) > 0:
new_states = []
for hyp, s, p in best_states:
# Cutoff when we exceed the character limit.
if len(hyp) >= limit:
final_hypotheses.append((hyp, p))
continue
# Get the prediction from the current LSTM state.
unnormalized = dy.affine_transform([b, W, s.output()])
softmax = dy.softmax(unnormalized).npvalue()
# Sample beam number of times.
for beami in range(beam):
ci = sample_softmax(softmax)
c = self.i2c[ci]
next_p = softmax[ci]
logp = p - np.log(next_p)
if c == EOW:
# Add final hypothesis if we reach end of word.
final_hypotheses.append((hyp, logp))
else:
# Else add to states to search next time step.
new_states.append((hyp + c,
s.add_input(self.lookup[ci]),
logp))
# Sort and prune the states to within the beam.
new_states.sort(key=lambda t: t[-1])
best_states = new_states[:beam]
final_hypotheses.sort(key=lambda t: t[-1])
generated.append(final_hypotheses[0][0])
return generated
def evaluate_network(self, t):
dy.renew_cg()
W = self.params["W"][0]
b = self.params["b"][0]
x = dy.vecInput(2)
x.set(t)
if self.with_bias[0]:
output = derlu(W * (x + b))
else:
output = derlu(W * x)
self.last_output = output
return output
def do_cpu():
import _dynet as C
C.init()
cm = C.Model()
cpW = cm.add_parameters((1000, 1000))
s = time.time()
C.renew_cg()
W = C.parameter(cpW)
W = W * W * W * W * W * W * W
z = C.squared_distance(W, W)
z.value()
z.backward()
print("CPU time:", time.time() - s)
def do_cpu():
import _dynet as C
C.init()
cm = C.Model()
cpW = cm.add_parameters((1000,1000))
s = time.time()
C.renew_cg()
W = C.parameter(cpW)
W = W*W*W*W*W*W*W
z = C.squared_distance(W,W)
z.value()
z.backward()
print("CPU time:",time.time() - s)
def construct_vector(self, sentence_as_char_codes):
params = self.params
dy.renew_cg()
builder = params["builders"][0]
E = params["E"]
sentence_as_wembs = []
for word in sentence_as_char_codes:
char_lstm = builder.initial_state()
cembs = [E[char] for char in word]
# running the char-level lstm
word_vec = char_lstm.transduce(cembs)[-1]
sentence_as_wembs.append(word_vec)
return sentence_as_wembs
def train(epoch, trees, policy, trainer, best, best_idx, wrong_total_l):
# hyper edge fragment hyper-prec hyper-recall root
metric_total = [0] * 6
micro_total = [0.] * 3
wrong_at_total = [0.] * 10
np.random.shuffle(trees)
loss = 0
policy.set_dropout(args.path_dropout_rate)
for i_episode in tqdm(range(len(trees))):
T = trees[i_episode]
entropy_l = []
dy.renew_cg()
policy.re_init()
for _ in range(args.n_rollout):
# prob_l = []
policy.init_history()
policy.rewards.append([])
policy.saved_actions.append([])
while len(T.V) > 0:
pair, pr, entropy = select_action(T, policy, choose_max=False, mode='train')
if pair is None:
break
entropy_l.append(entropy)
# prob_l.append(pr)
T.update(pair)
if args.reward_form != 'last' or len(T.V) == 0:
reward = T.eval(reward_type=args.reward, reward_form=args.reward_form)
else:
reward = 0
policy.rewards[-1].append(reward)
metric_total, micro_total, wrong_at_total, wrong_total = T.evaluate(metric_total, micro_total,
wrong_at_total, reward_type='print')
wrong_total_l.append(wrong_total)
# scores_save.append(T.evaluate(reward_type=REWARD, return_all=True))
# prob_save.append(prob_l)
T.re_init()
loss += finish_episode(policy, trainer, entropy_l)
for m_idx in range(5):
metric_total[m_idx] = round(metric_total[m_idx] / len(trees) / args.n_rollout, 3)
metric_total[0] = T.f1_calc(metric_total[3], metric_total[4])
for w_idx in range(len(wrong_at_total)):
wrong_at_total[w_idx] = round(wrong_at_total[w_idx] / len(trees) / args.n_rollout, 3)
metric_total[5] /= args.n_rollout
best, best_idx = update_best(metric_total, best, best_idx, epoch)
if epoch % 1 == 0:
print '[train]epoch {}:{} {} {} {}'.format(epoch, metric_total, micro_total, get_micro_f1(micro_total),
wrong_at_total),
print 'total_loss', loss, 'best', best, best_idx
return best, best_idx
def evaluate_network_from_sentence(self, sentence):
dy.renew_cg()
E = self.p3a.params["E"]
E_pre = self.params["E_pre"]
E_suf = self.params["E_suf"]
input_vectors = []
pre_suf_pairs = self.encoder.encode_sentence_prefix_suffix(sentence)
sentence_codes = self.encoder.encode_sentence_words(sentence)
for i in range(len(sentence)):
vec = E[sentence_codes[i][0]]
pre_code, suf_code = pre_suf_pairs[i]
if pre_code >= 0: vec += E_pre[pre_code]
if suf_code >= 0: vec += E_suf[suf_code]
input_vectors.append(vec)
return self.p3a.common.evaluate_network_from_embs(input_vectors, False)
def do_gpu():
import _dynet as G
import sys
sys.argv.append('--dynet-devices')
sys.argv.append('GPU:0')
G.init()
gm = G.Model()
gpW = gm.add_parameters((1000, 1000))
s = time.time()
G.renew_cg()
W = G.parameter(gpW)
W = W * W * W * W * W * W * W
z = G.squared_distance(W, W)
z.value()
z.backward()
print("GPU time:", time.time() - s)
def do_gpu():
import _dynet as G
import sys
sys.argv.append('--dynet-devices')
sys.argv.append('GPU:0')
G.init()
gm = G.Model()
gpW = gm.add_parameters((1000,1000))
s = time.time()
G.renew_cg()
W = G.parameter(gpW)
W = W*W*W*W*W*W*W
z = G.squared_distance(W,W)
z.value()
z.backward()
print("GPU time:",time.time() - s)
def predict(self, seq, train=False, output_confidences=False, unk_tag=None, update_embeds=True):
"""
predict tags for a sentence represented as char+word embeddings and compute losses for this instance
"""
if not train:
dynet.renew_cg()
features = self.get_features(seq.words, train=train, update=update_embeds)
output_expected_at_layer = self.predictors["task_expected_at"][seq.task_id]
output_expected_at_layer -=1
# go through layers
# input is now combination of w + char emb
prev = features
prev_rev = features
num_layers = self.h_layers
for i in range(0,num_layers):
predictor = self.predictors["inner"][i]
forward_sequence, backward_sequence = predictor.predict_sequence(prev, prev_rev)
if i > 0 and self.activation:
# activation between LSTM layers
forward_sequence = [self.activation(s) for s in forward_sequence]
backward_sequence = [self.activation(s) for s in backward_sequence]
if i == output_expected_at_layer:
output_predictor = self.predictors["output_layers_dict"][seq.task_id]
concat_layer = [dynet.concatenate([f, b]) for f, b in zip(forward_sequence,reversed(backward_sequence))]
if train and self.noise_sigma > 0.0:
concat_layer = [dynet.noise(fe,self.noise_sigma) for fe in concat_layer]
# fill-in predictions and get loss per tag
losses = output_predictor.predict_sequence(seq, concat_layer,
train=train, output_confidences=output_confidences,
unk_tag=unk_tag, dictionary=self.dictionary,
type_constraint=self.type_constraint)
prev = forward_sequence
prev_rev = backward_sequence
if train:
# return losses
return losses
else:
return seq.pred_tags, seq.tag_confidences
def predict(self, seq, train=False, output_confidences=False, unk_tag=None, update_embeds=True):
"""
predict tags for a sentence represented as char+word embeddings and compute losses for this instance
"""
if not train:
dynet.renew_cg()
features = self.get_features(seq.words, train=train, update=update_embeds)
output_expected_at_layer = self.predictors["task_expected_at"][seq.task_id]
output_expected_at_layer -=1
# go through layers
# input is now combination of w + char emb
prev = features
prev_rev = features
num_layers = self.h_layers
for i in range(0,num_layers):
predictor = self.predictors["inner"][i]
forward_sequence, backward_sequence = predictor.predict_sequence(prev, prev_rev)
if i > 0 and self.activation:
# activation between LSTM layers
forward_sequence = [self.activation(s) for s in forward_sequence]
backward_sequence = [self.activation(s) for s in backward_sequence]
if i == output_expected_at_layer:
output_predictor = self.predictors["output_layers_dict"][seq.task_id]
concat_layer = [dynet.concatenate([f, b]) for f, b in zip(forward_sequence,reversed(backward_sequence))]
if train and self.noise_sigma > 0.0:
concat_layer = [dynet.noise(fe,self.noise_sigma) for fe in concat_layer]
# fill-in predictions and get loss per tag
losses = output_predictor.predict_sequence(seq, concat_layer,
train=train, output_confidences=output_confidences,
unk_tag=unk_tag, dictionary=self.dictionary,
type_constraint=self.type_constraint)
prev = forward_sequence
prev_rev = backward_sequence
if train:
# return losses
return losses
else:
return seq.pred_tags, seq.tag_confidences
def __init__(self,word_size,context_fre, context_size,vocab,window=2,subsample_n=2000,mode='bow',embed_size=200, batch_size=128,num_sampled=5, epoch=6):
self.embed_size = embed_size
self.mode = mode
self.window = window
self.vocab = vocab
self.word_size = word_size
self.subsample_n = subsample_n
self.context_size = context_size
self.num_sampled = num_sampled
self.epoch = epoch
self.context_fre = context_fre
self.batch_size=batch_size
self.pc = dy.ParameterCollection()
self.optimizer = dy.AdamTrainer(self.pc)
self.word_embeddings = self.pc.add_lookup_parameters((self.word_size, self.embed_size), name="word-embeddings")
self.context_embeddings = self.pc.add_lookup_parameters((self.context_size, self.embed_size), name="context-embeddings")
dy.renew_cg()
print ([(param.name(), param.shape()) for param in self.pc.lookup_parameters_list() + self.pc.parameters_list()])
def create_network_params(nwords, ntags, external_E=None):
# create a parameter collection and add the parameters.
print("adding parameters")
m = dy.ParameterCollection()
print("nwords: {}".format(nwords))
E = m.add_lookup_parameters((nwords, EMB), name='E')
if external_E and sum(external_E.shape) > 0:
assert external_E.shape[1] == EMB
external_rows = external_E.shape[0]
for r in range(external_rows):
E.init_row(r, external_E[r, :])
b = m.add_parameters(HIDDEN, name='b')
U = m.add_parameters((ntags, HIDDEN), name='U')
W = m.add_parameters((HIDDEN, INPUT), name='W')
bp = m.add_parameters(ntags, name='bp')
dy.renew_cg()
return m, E, b, U, W, bp
def get_top_k_paths(self, all_paths, relation_index, threshold):
"""
Get the top k scoring paths
"""
builder = self.builder
model = self.model
model_parameters = self.model_parameters
lemma_lookup = model_parameters['lemma_lookup']
pos_lookup = model_parameters['pos_lookup']
dep_lookup = model_parameters['dep_lookup']
dir_lookup = model_parameters['dir_lookup']
path_scores = []
for i, path in enumerate(all_paths):
if i % 1000 == 0:
cg = dy.renew_cg()
W1 = dy.parameter(model_parameters['W1'])
b1 = dy.parameter(model_parameters['b1'])
W2 = None
b2 = None
if self.num_hidden_layers == 1:
W2 = dy.parameter(model_parameters['W2'])
b2 = dy.parameter(model_parameters['b2'])
path_embedding = get_path_embedding(builder, lemma_lookup,
pos_lookup, dep_lookup,
dir_lookup, path)
if self.use_xy_embeddings:
zero_word = dy.inputVector([0.0] * self.lemma_embeddings_dim)
path_embedding = dy.concatenate(
[zero_word, path_embedding, zero_word])
h = W1 * path_embedding + b1
if self.num_hidden_layers == 1:
h = W2 * dy.tanh(h) + b2
path_score = dy.softmax(h).npvalue().T
path_scores.append(path_score)
path_scores = np.vstack(path_scores)
top_paths = []
for i in range(len(relation_index)):
indices = np.argsort(-path_scores[:, i])
top_paths.append([
(all_paths[index], path_scores[index, i]) for index in indices
if threshold is None or path_scores[index, i] >= threshold
])
return top_paths
def evaluate_adversary(self, dataset):
loss = 0
acc = 0
tot = len(dataset)
predictions = []
for i, ex in enumerate(dataset):
dy.renew_cg()
vec, labels = ex
vec = dy.inputVector(vec)
l, p = self.adversary_classifier.get_loss_and_prediction(vec, labels)
predictions.append(p)
if p == labels:
acc += 1
loss += l.value()
return loss / tot, acc / tot * 100, predictions
def build_representations_mono(self,
sentence,
training,
prefix=[],
do_not_renew=False):
if not do_not_renew:
dy.renew_cg(immediate_compute=True, check_validity=True)
coded_sentence = self.vocabulary.code_sentence_cw(sentence, training)
coded_prefix = self.vocabulary.code_sentence_cw(prefix, training)
#print(prefix)
#print(coded_prefix)
w_init_f = self.wrnn[F].initial_state()
f_lstm_input = self.get_static_representations(coded_prefix +
coded_sentence)
contextual_embeddings = w_init_f.transduce(f_lstm_input)
return (contextual_embeddings[-1], contextual_embeddings)
def train(network,
trainer,
words,
epochs,
batch_size=100,
max_batch_num=5,
callback=lambda *args: None):
last_loss = None
batch_num = min(len(words) // batch_size + 1, max_batch_num)
for enum in range(epochs):
eloss = 0
bnum = 0
for bi in range(batch_num):
bwords = np.random.choice(words, size=batch_size, replace=True)
if len(bwords) < 1:
continue
dy.renew_cg()
loss = network.train_batch(bwords)
eloss += loss.value()
loss.backward()
trainer.update()
bnum += 1
eloss = eloss / bnum
if last_loss:
last_loss = 0.95 * last_loss + 0.05 * eloss
else:
last_loss = eloss
# print('Epoch {} loss: {:.6f} Running avg.: {:.6f}'.format(
# enum + 1, eloss, last_loss))
callback(enum, eloss, last_loss)
return last_loss
def calculate_loss(self, sents):
dy.renew_cg()
losses = []
for sent in sents:
features, t_features, feat_reconstruct = self.get_features_for_tagging(
sent, True
)
gold_tags = [tag for chars, word, feats, tag in sent]
cur_loss = self.crf_module.negative_log_loss(
features, t_features, gold_tags
)
if self.autoencoder:
autoencoder_loss = [
dy.binary_log_loss(reconstruct, dy.inputTensor(feats))
for reconstruct, (chars, word, feats, tag) in zip(
feat_reconstruct, sent
)
]
else: # remove autoencoder loss
autoencoder_loss = [dy.scalarInput(0)]
losses.append(cur_loss + (dy.esum(autoencoder_loss) / self.featsize))
return dy.esum(losses)
def test(parser,
testing_data,
evalb_dir,
unsupervised=False,
test_bert_embeddings=None):
test_predicted = []
for idx, data in enumerate(testing_data):
dy.renew_cg()
if test_bert_embeddings is None:
predicted = parser.parse(data, False)
else:
predicted = parser.parse(data, False, test_bert_embeddings[idx])
test_predicted.append(predicted)
if unsupervised:
test_predicted_errs = [x[0] for x in test_predicted]
test_predicted_span_sets = [x[1] for x in test_predicted]
test_fscore = evaluate.evalb_US(testing_data, test_predicted_span_sets)
test_ppl = evaluate.evalb_ppl(testing_data, test_predicted_errs)
return test_fscore, test_ppl
else:
test_fscore = evaluate.evalb(testing_data, test_predicted)
# test_fscore = evaluate.evalb_tag(testing_data, test_predicted)
return test_fscore
def predict(self,
feature_vector,
train=False,
soft_labels=False,
temperature=None,
dropout_rate=None):
dynet.renew_cg() # new graph
feature_vector = feature_vector.toarray()
feature_vector = np.squeeze(feature_vector, axis=0)
# self.input = dynet.vecInput(self.vocab_size)
# self.input.set(feature_vector)
# TODO this takes too long; can we speed this up somehow?
input = dynet.inputVector(feature_vector)
for i in range(self.h_layers - 1):
if train: # add some noise
input = dynet.noise(input, self.noise_sigma)
input = dynet.dropout(input, dropout_rate)
input = self.layers[i](input)
output = self.layers[-1](input,
soft_labels=soft_labels,
temperature=temperature)
return output
def main():
parser = argparse.ArgumentParser(
description=
'Convolutional Neural Networks for Sentence Classification in DyNet')
parser.add_argument('--gpu',
type=int,
default=0,
help='GPU ID to use. For cpu, set -1 [default: 0]')
parser.add_argument(
'--train_x_path',
type=str,
default='./data/train_x.txt',
help='File path of train x data [default: `./data/train_x.txt`]')
parser.add_argument(
'--train_y_path',
type=str,
default='./data/train_y.txt',
help='File path of train y data [default: `./data/train_x.txt`]')
parser.add_argument(
'--valid_x_path',
type=str,
default='./data/valid_x.txt',
help='File path of valid x data [default: `./data/valid_x.txt`]')
parser.add_argument(
'--valid_y_path',
type=str,
default='./data/valid_y.txt',
help='File path of valid y data [default: `./data/valid_y.txt`]')
parser.add_argument('--n_epochs',
type=int,
default=10,
help='Number of epochs [default: 10]')
parser.add_argument('--batch_size',
type=int,
default=64,
help='Mini batch size [default: 64]')
parser.add_argument('--win_sizes',
type=int,
nargs='*',
default=[3, 4, 5],
help='Window sizes of filters [default: [3, 4, 5]]')
parser.add_argument(
'--num_fil',
type=int,
default=100,
help='Number of filters in each window size [default: 100]')
parser.add_argument('--s',
type=float,
default=3.0,
help='L2 norm constraint on w [default: 3.0]')
parser.add_argument('--dropout_prob',
type=float,
default=0.5,
help='Dropout probability [default: 0.5]')
parser.add_argument(
'--v_strategy',
type=str,
default='static',
help=
'Embedding strategy. rand: Random initialization. static: Load pretrained embeddings and do not update during the training. non-static: Load pretrained embeddings and update during the training. [default: static]'
)
parser.add_argument(
'--alloc_mem',
type=int,
default=4096,
help='Amount of memory to allocate [mb] [default: 4096]')
args = parser.parse_args()
print(args)
os.environ['CUDA_VISIBLE_DEVICES'] = str(args.gpu)
N_EPOCHS = args.n_epochs
WIN_SIZES = args.win_sizes
BATCH_SIZE = args.batch_size
EMB_DIM = 300
OUT_DIM = 1
L2_NORM_LIM = args.s
NUM_FIL = args.num_fil
DROPOUT_PROB = args.dropout_prob
V_STRATEGY = args.v_strategy
ALLOC_MEM = args.alloc_mem
if V_STRATEGY in ['rand', 'static', 'non-static']:
NUM_CHA = 1
else:
NUM_CHA = 2
# FILE paths
W2V_PATH = './GoogleNews-vectors-negative300.bin'
TRAIN_X_PATH = args.train_x_path
TRAIN_Y_PATH = args.train_y_path
VALID_X_PATH = args.valid_x_path
VALID_Y_PATH = args.valid_y_path
# DyNet setting
dyparams = dy.DynetParams()
dyparams.set_random_seed(RANDOM_SEED)
dyparams.set_mem(ALLOC_MEM)
dyparams.init()
# Load pretrained embeddings
pretrained_model = gensim.models.KeyedVectors.load_word2vec_format(
W2V_PATH, binary=True)
vocab = pretrained_model.wv.vocab.keys()
w2v = pretrained_model.wv
# Build dataset =======================================================================================================
w2c = build_w2c(TRAIN_X_PATH, vocab=vocab)
w2i, i2w = build_w2i(TRAIN_X_PATH, w2c, unk='unk')
train_x, train_y = build_dataset(TRAIN_X_PATH,
TRAIN_Y_PATH,
w2i,
unk='unk')
valid_x, valid_y = build_dataset(VALID_X_PATH,
VALID_Y_PATH,
w2i,
unk='unk')
train_x, train_y = sort_data_by_length(train_x, train_y)
valid_x, valid_y = sort_data_by_length(valid_x, valid_y)
VOCAB_SIZE = len(w2i)
print('VOCAB_SIZE:', VOCAB_SIZE)
V_init = init_V(w2v, w2i)
with open(os.path.join(RESULTS_DIR, './w2i.dump'),
'wb') as f_w2i, open(os.path.join(RESULTS_DIR, './i2w.dump'),
'wb') as f_i2w:
pickle.dump(w2i, f_w2i)
pickle.dump(i2w, f_i2w)
# Build model =================================================================================
model = dy.Model()
trainer = dy.AdamTrainer(model)
# V1
V1 = model.add_lookup_parameters((VOCAB_SIZE, EMB_DIM))
if V_STRATEGY in ['static', 'non-static', 'multichannel']:
V1.init_from_array(V_init)
if V_STRATEGY in ['static', 'multichannel']:
V1_UPDATE = False
else: # 'rand', 'non-static'
V1_UPDATE = True
make_emb_zero(V1, [w2i['<s>'], w2i['</s>']], EMB_DIM)
# V2
if V_STRATEGY == 'multichannel':
V2 = model.add_lookup_parameters((VOCAB_SIZE, EMB_DIM))
V2.init_from_array(V_init)
V2_UPDATE = True
make_emb_zero(V2, [w2i['<s>'], w2i['</s>']], EMB_DIM)
layers = [
CNNText(model, EMB_DIM, WIN_SIZES, NUM_CHA, NUM_FIL, dy.tanh,
DROPOUT_PROB),
Dense(model, 3 * NUM_FIL, OUT_DIM, dy.logistic)
]
# Train model ================================================================================
n_batches_train = math.ceil(len(train_x) / BATCH_SIZE)
n_batches_valid = math.ceil(len(valid_x) / BATCH_SIZE)
start_time = time.time()
for epoch in range(N_EPOCHS):
# Train
loss_all_train = []
pred_all_train = []
for i in tqdm(range(n_batches_train)):
# Create a new computation graph
dy.renew_cg()
associate_parameters(layers)
# Create a mini batch
start = i * BATCH_SIZE
end = start + BATCH_SIZE
x = build_batch(train_x[start:end], w2i, max(WIN_SIZES)).T
t = np.array(train_y[start:end])
sen_len = x.shape[0]
if V_STRATEGY in ['rand', 'static', 'non-static']:
x_embs = dy.concatenate_cols(
[dy.lookup_batch(V1, x_t, update=V1_UPDATE) for x_t in x])
x_embs = dy.transpose(x_embs)
x_embs = dy.reshape(x_embs, (sen_len, EMB_DIM, 1))
else: # multichannel
x_embs1 = dy.concatenate_cols(
[dy.lookup_batch(V1, x_t, update=V1_UPDATE) for x_t in x])
x_embs2 = dy.concatenate_cols(
[dy.lookup_batch(V2, x_t, update=V2_UPDATE) for x_t in x])
x_embs1 = dy.transpose(x_embs1)
x_embs2 = dy.transpose(x_embs2)
x_embs = dy.concatenate([x_embs1, x_embs2], d=2)
t = dy.inputTensor(t, batched=True)
y = forwards(layers, x_embs, test=False)
mb_loss = dy.mean_batches(dy.binary_log_loss(y, t))
# Forward prop
loss_all_train.append(mb_loss.value())
pred_all_train.extend(list(binary_pred(y.npvalue().flatten())))
# Backward prop
mb_loss.backward()
trainer.update()
# L2 norm constraint
layers[1].scale_W(L2_NORM_LIM)
# Make padding embs zero
if V_STRATEGY in ['rand', 'non-static']:
make_emb_zero(V1, [w2i['<s>'], w2i['</s>']], EMB_DIM)
elif V_STRATEGY in ['multichannel']:
make_emb_zero(V2, [w2i['<s>'], w2i['</s>']], EMB_DIM)
# Valid
loss_all_valid = []
pred_all_valid = []
for i in range(n_batches_valid):
# Create a new computation graph
dy.renew_cg()
associate_parameters(layers)
# Create a mini batch
start = i * BATCH_SIZE
end = start + BATCH_SIZE
x = build_batch(valid_x[start:end], w2i, max(WIN_SIZES)).T
t = np.array(valid_y[start:end])
sen_len = x.shape[0]
if V_STRATEGY in ['rand', 'static', 'non-static']:
x_embs = dy.concatenate_cols(
[dy.lookup_batch(V1, x_t, update=V1_UPDATE) for x_t in x])
x_embs = dy.transpose(x_embs)
x_embs = dy.reshape(x_embs, (sen_len, EMB_DIM, 1))
else: # multichannel
x_embs1 = dy.concatenate_cols(
[dy.lookup_batch(V1, x_t, update=V1_UPDATE) for x_t in x])
x_embs2 = dy.concatenate_cols(
[dy.lookup_batch(V2, x_t, update=V2_UPDATE) for x_t in x])
x_embs1 = dy.transpose(x_embs1)
x_embs2 = dy.transpose(x_embs2)
x_embs = dy.concatenate([x_embs1, x_embs2], d=2)
t = dy.inputTensor(t, batched=True)
y = forwards(layers, x_embs, test=True)
mb_loss = dy.mean_batches(dy.binary_log_loss(y, t))
# Forward prop
loss_all_valid.append(mb_loss.value())
pred_all_valid.extend(list(binary_pred(y.npvalue().flatten())))
print(
'EPOCH: %d, Train Loss:: %.3f (F1:: %.3f, Acc:: %.3f), Valid Loss:: %.3f (F1:: %.3f, Acc:: %.3f), Time:: %.3f[s]'
% (
epoch + 1,
np.mean(loss_all_train),
f1_score(train_y, pred_all_train),
accuracy_score(train_y, pred_all_train),
np.mean(loss_all_valid),
f1_score(valid_y, pred_all_valid),
accuracy_score(valid_y, pred_all_valid),
time.time() - start_time,
))
# Save model =========================================================================================================================
if V_STRATEGY in ['rand', 'static', 'non-static']:
dy.save(os.path.join(RESULTS_DIR, './model_e' + str(epoch + 1)),
[V1] + layers)
else:
dy.save(os.path.join(RESULTS_DIR, './model_e' + str(epoch + 1)),
[V1, V2] + layers)
def fit(self, train, num_iterations, dev=None, model_path=None, patience=0, minibatch_size=0, log_losses=False):
"""
train the tagger
"""
losses_log = {} # log losses
print("init parameters")
self.init_parameters(train)
# init lookup parameters and define graph
print("build graph")
self.build_computation_graph(len(self.w2i), len(self.c2i))
update_embeds = True
if self.backprob_embeds == False: ## disable backprob into embeds
print(">>> disable wembeds update <<<")
update_embeds = False
best_val_acc, epochs_no_improvement = 0.0, 0
if dev and model_path is not None and patience > 0:
print('Using early stopping with patience of {}...'.format(patience))
batch = []
print("train..")
for iteration in range(num_iterations):
total_loss=0.0
total_tagged=0.0
indices = [i for i in range(len(train.seqs))]
random.shuffle(indices)
loss_accum_loss = defaultdict(float)
loss_accum_tagged = defaultdict(float)
for idx in indices:
seq = train.seqs[idx]
if seq.task_id not in losses_log:
losses_log[seq.task_id] = [] #initialize
if minibatch_size > 1:
# accumulate instances for minibatch update
loss1 = self.predict(seq, train=True, update_embeds=update_embeds)
total_tagged += len(seq.words)
batch.append(loss1)
if len(batch) == minibatch_size:
loss = dynet.esum(batch)
total_loss += loss.value()
# logging
loss_accum_tagged[seq.task_id] += len(seq.words)
loss_accum_loss[seq.task_id] += loss.value()
loss.backward()
self.trainer.update()
dynet.renew_cg() # use new computational graph for each BATCH when batching is active
batch = []
else:
dynet.renew_cg() # new graph per item
loss1 = self.predict(seq, train=True, update_embeds=update_embeds)
total_tagged += len(seq.words)
lv = loss1.value()
total_loss += lv
# logging
loss_accum_tagged[seq.task_id] += len(seq.words)
loss_accum_loss[seq.task_id] += loss1.value()
loss1.backward()
self.trainer.update()
print("iter {2} {0:>12}: {1:.2f}".format("total loss", total_loss/total_tagged, iteration))
# log losses
for task_id in sorted(losses_log):
losses_log[task_id].append(loss_accum_loss[task_id] / loss_accum_tagged[task_id])
if log_losses:
dill.dump(losses_log, open(model_path + ".model" + ".losses.pickle", "wb"))
if dev:
# evaluate after every epoch
correct, total = self.evaluate(dev, "task0")
val_accuracy = correct/total
print("dev accuracy: {0:.4f}".format(val_accuracy))
if val_accuracy > best_val_acc:
print('Accuracy {0:.4f} is better than best val accuracy '
'{1:.4f}.'.format(val_accuracy, best_val_acc))
best_val_acc = val_accuracy
epochs_no_improvement = 0
save(self, model_path)
else:
print('Accuracy {0:.4f} is worse than best val loss {1:.4f}.'.format(val_accuracy, best_val_acc))
epochs_no_improvement += 1
if patience > 0:
if epochs_no_improvement == patience:
print('No improvement for {} epochs. Early stopping...'.format(epochs_no_improvement))
break
def create_computation_graph(num_lemmas,
num_pos,
num_dep,
num_directions,
num_relations,
wv=None,
use_xy_embeddings=False,
num_hidden_layers=0,
lemma_dimension=50):
"""
Initialize the model
:param num_lemmas Number of distinct lemmas
:param num_pos Number of distinct part of speech tags
:param num_dep Number of distinct depenedency labels
:param num_directions Number of distinct path directions (e.g. >,<)
:param num_relations Number of classes (e.g. binary = 2)
:param wv Pre-trained word embeddings file
:param use_xy_embeddings Whether to concatenate x and y word embeddings to the network input
:param num_hidden_layers The number of hidden layers for the term-pair classification network
:param lemma_dimension The dimension of the lemma embeddings
:return:
"""
# model = Model() -- gives error? tried to fix by looking at dynet tutorial examples -- GB
dy.renew_cg()
model = dy.ParameterCollection()
network_input = LSTM_HIDDEN_DIM
builder = dy.LSTMBuilder(NUM_LAYERS,
lemma_dimension + POS_DIM + DEP_DIM + DIR_DIM,
network_input, model)
# Concatenate x and y
if use_xy_embeddings:
network_input += 2 * lemma_dimension
# 'the optimal size of the hidden layer is usually between the size of the input and size of the output layers'
hidden_dim = int((network_input + num_relations) / 2)
model_parameters = {}
if num_hidden_layers == 0:
model_parameters['W1'] = model.add_parameters(
(num_relations, network_input))
model_parameters['b1'] = model.add_parameters((num_relations, 1))
elif num_hidden_layers == 1:
model_parameters['W1'] = model.add_parameters(
(hidden_dim, network_input))
model_parameters['b1'] = model.add_parameters((hidden_dim, 1))
model_parameters['W2'] = model.add_parameters(
(num_relations, hidden_dim))
model_parameters['b2'] = model.add_parameters((num_relations, 1))
else:
raise ValueError('Only 0 or 1 hidden layers are supported')
model_parameters['lemma_lookup'] = model.add_lookup_parameters(
(num_lemmas, lemma_dimension))
# Pre-trained word embeddings
if wv is not None:
model_parameters['lemma_lookup'].init_from_array(wv)
model_parameters['pos_lookup'] = model.add_lookup_parameters(
(num_pos, POS_DIM))
model_parameters['dep_lookup'] = model.add_lookup_parameters(
(num_dep, DEP_DIM))
model_parameters['dir_lookup'] = model.add_lookup_parameters(
(num_directions, DIR_DIM))
return builder, model, model_parameters
