def get_c2q_attention(self, session, context_path, qn_path, ans_path, dataset, num_samples=0):
"""
Sample from the provided (train/dev) set.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
Returns:
begin_prob, end_prob: The average probabilities the sampled examples.
"""
total_c2q_attention = []
example_num = 0
for batch in get_batch_generator(
self.word2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=False,
random=False):
c2q_dists = self.get_c2q_attention_dist(session, batch)
c2q_list = c2q_dists.tolist() # list length batch_size
for _, (c2q_dist) in enumerate(c2q_list):
example_num += 1
total_c2q_attention.append(c2q_dist)
# print_example(self.word2id, batch.context_tokens[ex_idx], batch.qn_tokens[ex_idx], batch.ans_span[ex_idx, 0], batch.ans_span[ex_idx, 1], pred_ans_start, pred_ans_end, true_answer, pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
return np.asarray(total_c2q_attention)
def evaluate(model, word2id, FLAGS, dev_context_path, dev_qn_path,
dev_ans_path):
logging.info("Calculating F1/EM for all examples in dev set...")
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
for batch in get_batch_generator(word2id,
dev_context_path,
dev_qn_path,
dev_ans_path,
FLAGS.batch_size,
context_len=FLAGS.context_len,
question_len=FLAGS.question_len,
discard_long=False):
# print(type(batch))
prob_start, prob_end = model.predict([
batch.context_ids, batch.context_mask, batch.qn_ids, batch.qn_mask
])
start_pos = np.argmax(prob_start, axis=1)
end_pos = np.argmax(prob_end, axis=1)
pred_start_pos = start_pos.tolist()
pred_end_pos = end_pos.tolist()
for ex_idx, (pred_ans_start, pred_ans_end,
true_ans_tokens) in enumerate(
zip(pred_start_pos, pred_end_pos, batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][
pred_ans_start:pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
# print(f1, em, example_num)
f1_total /= example_num
em_total /= example_num
toc = time.time()
print("Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, "dev", toc - tic))
return f1_total, em_total
def get_spans(self, session, context_path, qn_path, ans_path, dataset, num_samples=0):
"""
Sample from the provided (train/dev) set.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
Returns:
begin_prob, end_prob: The average probabilities the sampled examples.
"""
total_start_dists = []
total_end_dists = []
f1_em_scores = []
example_num = 0
for batch in get_batch_generator(
self.word2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=False,
random=False):
pred_start_dists, pred_end_dists = self.get_prob_dists(session, batch)
pred_start_pos, pred_end_pos = self.get_start_end_pos(session, batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
pred_start_dists = pred_start_dists.tolist() # list length batch_size
pred_end_dists = pred_end_dists.tolist() # list length batch_size
for ex_idx, (pred_ans_start, pred_ans_end, true_ans_tokens) in enumerate(zip(pred_start_pos, pred_end_pos, batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][pred_ans_start : pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_em_scores.append((f1,em))
# print_example(self.word2id, batch.context_tokens[ex_idx], batch.qn_tokens[ex_idx], batch.ans_span[ex_idx, 0], batch.ans_span[ex_idx, 1], pred_ans_start, pred_ans_end, true_answer, pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
# Convert the start and end positions to lists length batch_size
total_end_dists += pred_end_dists
total_start_dists += pred_start_dists
if num_samples != 0 and example_num >= num_samples:
break
return np.asarray(total_start_dists), np.asarray(total_end_dists), np.asarray(f1_em_scores)
def get_dev_loss(self, session, dev_context_path, dev_qn_path, dev_ans_path):
"""
Get loss for entire dev set.
"""
logging.info("Calculating dev loss...")
tic = time.time()
loss_per_batch, batch_lengths = [], []
# Iterate over dev set batches
for batch in get_batch_generator(self.word2id, dev_context_path, dev_qn_path, dev_ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=True):
# Get loss for this batch
loss = self.get_loss(session, batch)
curr_batch_size = batch.batch_size
loss_per_batch.append(loss * curr_batch_size)
batch_lengths.append(curr_batch_size)
# Calculate average loss
total_num_examples = sum(batch_lengths)
toc = time.time()
print ("Computed dev loss over %i examples in %.2f seconds" % (total_num_examples, toc-tic))
# Overall loss is total loss divided by total number of examples
dev_loss = sum(loss_per_batch) / float(total_num_examples)
return dev_loss
def get_dev_loss(self, session, dev_context_path, dev_qn_path, dev_ans_path):
"""
Get loss for entire dev set.
Inputs:
session: TensorFlow session
dev_qn_path, dev_context_path, dev_ans_path: paths to the dev.{context/question/answer} data files
Outputs:
dev_loss: float. Average loss across the dev set.
"""
logging.info("Calculating dev loss...")
tic = time.time()
loss_per_batch, batch_lengths = [], []
# Iterate over dev set batches
# Note: here we set discard_long=True, meaning we discard any examples
# which are longer than our context_len or question_len.
# We need to do this because if, for example, the true answer is cut
# off the context, then the loss function is undefined.
for batch in get_batch_generator(self.word2id, dev_context_path, dev_qn_path, dev_ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=True):
# Get loss for this batch
loss = self.get_loss(session, batch)
curr_batch_size = batch.batch_size
loss_per_batch.append(loss * curr_batch_size)
batch_lengths.append(curr_batch_size)
# Calculate average loss
total_num_examples = sum(batch_lengths)
toc = time.time()
print("Computed dev loss over %i examples in %.2f seconds" % (total_num_examples, toc-tic))
# Overall loss is total loss divided by total number of examples
dev_loss = sum(loss_per_batch) / float(total_num_examples)
return dev_loss
def check_f1_em(self, model, dataset, num_samples=100, print_to_screen=False):
logging.info("Calculating F1/EM for %s examples in %s set..." % (str(num_samples) if num_samples != 0 else "all", dataset))
if dataset == "train":
context_path, qn_path, ans_path = self.train_context_path, self.train_qn_path, self.train_ans_path
elif dataset == "dev":
context_path, qn_path, ans_path = self.dev_context_path, self.dev_qn_path, self.dev_ans_path
else:
raise ('dataset is not defined')
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
for batch in get_batch_generator(self.word2id, context_path, qn_path, ans_path, config.batch_size,
context_len=config.context_len, question_len=config.question_len,
discard_long=False):
pred_start_pos, pred_end_pos = self.test_one_batch(batch, model)
pred_start_pos = pred_start_pos.tolist()
pred_end_pos = pred_end_pos.tolist()
for ex_idx, (pred_ans_start, pred_ans_end, true_ans_tokens) \
in enumerate(zip(pred_start_pos, pred_end_pos, batch.ans_tokens)):
example_num += 1
pred_ans_tokens = batch.context_tokens[ex_idx][pred_ans_start : pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
true_answer = " ".join(true_ans_tokens)
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
if print_to_screen:
print_example(self.word2id, batch.context_tokens[ex_idx], batch.qn_tokens[ex_idx],
batch.ans_span[ex_idx, 0], batch.ans_span[ex_idx, 1], pred_ans_start,
pred_ans_end, true_answer, pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
toc = time.time()
logging.info("Calculating F1/EM for %i examples in %s set took %.2f seconds" % (example_num, dataset, toc-tic))
return f1_total, em_total
def check_f1_em(self,
context_path,
qn_path,
ans_path,
dataset,
num_samples=1000):
f1_total = 0.
em_total = 0.
example_num = 0
for batch in data_batcher.get_batch_generator(self.word2id,
self.id2idf,
context_path,
qn_path,
ans_path,
self.batch_size,
context_len=300,
question_len=30,
discard_long=False):
pred_start_pos, pred_end_pos = self.get_predictions(batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
for ex_idx, (pred_ans_start, pred_ans_end, true_ans_tokens) in \
enumerate(zip(pred_start_pos, pred_end_pos, batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][
pred_ans_start:pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
return f1_total, em_total
def check_f1_em(self, session, context_path, qn_path, ans_path, dataset, num_samples=100, print_to_screen=False):
"""
Sample from the provided (train/dev) set.
For each sample, calculate F1 and EM score.
Return average F1 and EM score for all samples.
Optionally pretty-print examples.
"""
logging.info("Calculating F1/EM for %s examples in %s set..." % (str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
for batch in get_batch_generator(self.word2id, context_path, qn_path, ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=False):
pred_start_pos, pred_end_pos = self.get_start_end_pos(session, batch)
for ex_idx, (pred_ans_start, pred_ans_end, true_ans_tokens) in enumerate(zip(pred_start_pos, pred_end_pos, batch.ans_tokens)):
example_num += 1
# Get the predicted answer
pred_ans_tokens = batch.context_tokens[ex_idx][pred_ans_start : pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
# Optionally pretty-print
if print_to_screen:
print_example(self.word2id, batch.context_tokens[ex_idx], batch.qn_tokens[ex_idx], batch.ans_span[ex_idx, 0], batch.ans_span[ex_idx, 1], pred_ans_start, pred_ans_end, true_answer, pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
toc = time.time()
logging.info("Calculating F1/EM for %i examples in %s set took %.2f seconds" % (example_num, dataset, toc-tic))
return f1_total, em_total
def get_val_loss(self, session):
'''
Get average loss on the entire val set
This function is called periodically during training
'''
total_loss, num_examples = 0., 0
tic = time.time()
for batch in get_batch_generator(self.word2id, self.img_features_map, self.val_caption_id_2_caption, self.caption_id_2_img_id, \
self.FLAGS.batch_size, self.FLAGS.max_caption_len, 'train', None, self.FLAGS.data_source):
total_loss += self.get_loss(session, batch) * batch.batch_size
num_examples += batch.batch_size
logging.info("Computing validation loss over {} examples took {} seconds".format(num_examples, time.time() - tic))
return total_loss / num_examples
def get_dev_loss(self, session, dev_context_path, dev_qn_path,
dev_ans_path):
"""
Get loss for entire dev set.
Inputs:
session: TensorFlow session
dev_qn_path, dev_context_path, dev_ans_path: paths to the dev.{context/question/answer} data files
Outputs:
dev_loss: float. Average loss across the dev set.
"""
logging.info("Calculating dev loss...")
tic = time.time()
loss_per_batch, batch_lengths = [], []
i = 0
for batch in get_batch_generator(
self.word2id,
self.context2id,
self.ans2id,
dev_context_path,
dev_qn_path,
dev_ans_path,
self.FLAGS.batch_size,
self.graph_vocab_class,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
answer_len=self.FLAGS.answer_len,
discard_long=False,
use_raw_graph=self.FLAGS.use_raw_graph,
show_start_tokens=self.FLAGS.show_start_tokens):
loss = self.get_loss(session, batch)
curr_batch_size = batch.batch_size
loss_per_batch.append(loss * curr_batch_size)
batch_lengths.append(curr_batch_size)
if i == 10:
break
i += 1
# Calculate average loss
total_num_examples = sum(batch_lengths)
toc = time.time()
print "Computed dev loss over %i examples in %.2f seconds" % (
total_num_examples, toc - tic)
# Overall loss is total loss divided by total number of examples
dev_loss = sum(loss_per_batch) / float(total_num_examples)
return dev_loss
def train(self, session, train_context_path, train_qn_path, train_ans_path,
dev_qn_path, dev_context_path, dev_ans_path):
summary_writer = tf.summary.FileWriter(
"/Users/lam/Desktop/Lam-cs224n/Projects/qa/squad", session.graph)
for batch in get_batch_generator(self.word2id,
self.char2id,
train_context_path,
train_qn_path,
train_ans_path,
self.FLAGS.batch_size,
self.FLAGS.context_len,
self.FLAGS.question_len,
self.FLAGS.max_word_len,
discard_long=True):
self.sample_batch = batch
self.run_train_iter(session, batch, summary_writer)
break
def check_metric(self, session, mode='val', num_samples=0):
'''
Evaluate the model on the validation or test set.
Inputs:
mode: should be either 'val' or 'test'
num_samples: number of images to evaluate on. Evaluate on all val images if 0.
'''
assert (mode == 'val' or mode == 'test')
captions = [] # [{"image_id": image_id, "caption": caption_str}]
# Generate all the captions and save in list 'captions'
tic = time.time()
num_seen = 0 # Record the number of samples predicted so far
this_caption_map = self.val_caption_id_2_caption if mode == 'val' else self.test_caption_id_2_caption
for batch in get_batch_generator(self.word2id, self.img_features_map, this_caption_map, self.caption_id_2_img_id, \
self.FLAGS.batch_size, self.FLAGS.max_caption_len, 'eval', None, self.FLAGS.data_source):
batch_captions = self.get_captions(session, batch) # {imgae_id: caption_string}
for id, cap in batch_captions.items():
captions.append({"image_id": id, "caption": cap})
num_seen += batch.batch_size
if num_samples != 0 and num_seen >= num_samples:
break
logging.info("Predicting on {} examples took {} seconds".format(num_seen, time.time() - tic))
# Dump the generated captions to json file
file = open(self.FLAGS.train_res_dir, 'w')
json.dump(captions, file)
file.close()
# Evaluate using the official evaluation API (The evaluation takes ~12s for 1000 examples)
tic = time.time()
cocoGold = COCO(self.FLAGS.goldAnn_val_dir) # Official annotations
cocoRes = cocoGold.loadRes(self.FLAGS.train_res_dir) # Prediction
cocoEval = COCOEvalCap(cocoGold, cocoRes)
cocoEval.params['image_id'] = cocoRes.getImgIds() # Evaluate on a subset of the official captions_val2014
cocoEval.evaluate()
logging.info("Evaluating {} predictions took {} seconds".format(num_seen, time.time() - tic))
scores = cocoEval.eval # {metric_name: metric_score}
return scores # Bleu_1, Bleu_2, Bleu_3, Bleu_4, METEOR, ROUGE_L, CIDEr
def get_dev_loss(self, model):
logging.info("Calculating dev loss...")
tic = time.time()
loss_per_batch, batch_lengths = [], []
i = 0
for batch in get_batch_generator(self.word2id, self.dev_context_path, self.dev_qn_path, self.dev_ans_path,
config.batch_size, context_len=config.context_len,
question_len=config.question_len, discard_long=True):
loss, _, _ = self.eval_one_batch(batch, model)
curr_batch_size = batch.batch_size
loss_per_batch.append(loss * curr_batch_size)
batch_lengths.append(curr_batch_size)
i += 1
if i == 10:
break
total_num_examples = sum(batch_lengths)
toc = time.time()
print ("Computed dev loss over %i examples in %.2f seconds" % (total_num_examples, toc-tic))
dev_loss = sum(loss_per_batch) / float(total_num_examples)
return dev_loss
def get_dev_loss(self, session, dev_context_path, dev_qn_path, dev_ans_path):
"""
Get loss for entire dev set.
Inputs:
session: TensorFlow session
dev_qn_path, dev_context_path, dev_ans_path: paths to the dev.{context/question/answer} data files
Outputs:
dev_loss: float. Average loss across the dev set.
"""
logging.info("Calculating dev loss...")
tic = time.time()
loss_per_batch, batch_lengths = [], []
# Iterate over dev set batches
# Note: here we set discard_long=True, meaning we discard any examples
# which are longer than our context_len or question_len.
# We need to do this because if, for example, the true answer is cut
# off the context, then the loss function is undefined.
for batch in get_batch_generator(self.word2id, dev_context_path, dev_qn_path, dev_ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=True):
# Get loss for this batch
loss = self.get_loss(session, batch)
curr_batch_size = batch.batch_size
loss_per_batch.append(loss * curr_batch_size)
batch_lengths.append(curr_batch_size)
# Calculate average loss
total_num_examples = sum(batch_lengths)
toc = time.time()
print "Computed dev loss over %i examples in %.2f seconds" % (total_num_examples, toc-tic)
# Overall loss is total loss divided by total number of examples
dev_loss = sum(loss_per_batch) / float(total_num_examples)
return dev_loss
def demo(self,
session,
context_path,
qn_path,
ans_path,
dataset,
num_samples=10,
print_to_screen=False,
write_out=False,
file_out=None,
shuffle=True):
"""
Sample from the provided (train/dev) set.
For each sample, calculate F1 and EM score.
Return average F1 and EM score for all samples.
Optionally pretty-print examples.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
num_samples: int. How many samples to use. If num_samples=0 then do whole dataset.
print_to_screen: if True, pretty-prints each example to screen
Returns:
F1 and EM: Scalars. The average across the sampled examples.
"""
logging.info(
"Calculating F1/EM for %s examples in %s set..." %
(str(num_samples) if num_samples != 0 else "all", dataset))
example_num = 0
tic = time.time()
ans_list = []
graph_route_info = []
for batch in get_batch_generator(
self.word2id,
self.context2id,
self.ans2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
self.graph_vocab_class,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
answer_len=self.FLAGS.answer_len,
discard_long=False,
use_raw_graph=self.FLAGS.use_raw_graph,
shuffle=shuffle,
show_start_tokens=self.FLAGS.show_start_tokens,
output_goal=True):
train_ids, pred_ids, dev_final_states, pred_logits = self.get_prob_dists(
session, batch)
start_ids = batch.ans_ids[:, 0].reshape(-1)
if self.FLAGS.pred_method != 'beam':
pred_ids, confidence_score, ans_str = output_route(
start_ids, pred_logits, batch.context_tokens, self.ans2id,
self.id2ans, self.FLAGS.answer_len)
pred_ids = pred_ids.tolist() # the output of using test network
dev_attention_map = create_attention_images_summary(
dev_final_states)
print "dev_attention_map", dev_attention_map.shape
dev_attention_map = dev_attention_map.eval().tolist()
# the output of using training network, that the true input is fed as the input of the next RNN, for debug.
for ex_idx, (pred_ans_list, true_ans_tokens,
attention_map) in enumerate(
zip(pred_ids, list(batch.ans_tokens),
dev_attention_map)):
example_num += 1
pred_ans_tokens = []
for id in pred_ans_list:
if id == PAD_ID:
break
else:
pred_ans_tokens.append(self.id2ans[id])
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens[:])
# Calculate metrics
f1, em, edit_dist, rough_em = compute_all_metrics(
pred_ans_tokens, true_ans_tokens)
ans_list.append(pred_answer)
if print_to_screen:
print_example(self.word2id, self.context2id, self.ans2id,
batch.context_tokens[ex_idx],
batch.qn_tokens[ex_idx], true_answer,
pred_answer, f1, em, edit_dist,
confidence_score[ex_idx])
# Draw attention map
draw_attention(batch, ex_idx, attention_map,
pred_ans_tokens)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
toc = time.time()
logging.info(
"Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, dataset, toc - tic))
if write_out:
logging.info("Writing the prediction to {}".format(file_out))
with open(file_out, 'w') as f:
for line, extra_info in zip(ans_list, graph_route_info):
f.write(line + " " + " ".join(extra_info) + '\n')
print("Wrote predictions to %s" % file_out)
return
def train(self, session, train_context_path, train_qn_path, train_ans_path, dev_qn_path, dev_context_path, dev_ans_path):
"""
Main training loop.
"""
# Print number of model parameters
tic = time.time()
params = tf.trainable_variables()
num_params = sum(map(lambda t: np.prod(tf.shape(t.value()).eval()), params))
toc = time.time()
logging.info("Number of params: %d (retrieval took %f secs)" % (num_params, toc - tic))
exp_loss = None
# Checkpoint management.
checkpoint_path = os.path.join(self.FLAGS.train_dir, "qa.ckpt")
bestmodel_dir = os.path.join(self.FLAGS.train_dir, "best_checkpoint")
bestmodel_ckpt_path = os.path.join(bestmodel_dir, "qa_best.ckpt")
best_dev_f1 = None
best_dev_em = None
# for TensorBoard
summary_writer = tf.summary.FileWriter(self.FLAGS.train_dir, session.graph)
epoch = 0
logging.info("Beginning training loop...")
while self.FLAGS.num_epochs == 0 or epoch < self.FLAGS.num_epochs:
epoch += 1
epoch_tic = time.time()
for batch in get_batch_generator(self.word2id, train_context_path, train_qn_path, train_ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=True):
iter_tic = time.time()
loss, global_step, param_norm, grad_norm = self.run_train_iter(session, batch, summary_writer)
iter_toc = time.time()
iter_time = iter_toc - iter_tic
if not exp_loss: # first iter
exp_loss = loss
else:
exp_loss = 0.99 * exp_loss + 0.01 * loss
if global_step % self.FLAGS.print_every == 0:
logging.info(
'epoch %d, iter %d, loss %.5f, smoothed loss %.5f, grad norm %.5f, param norm %.5f, batch time %.3f' %
(epoch, global_step, loss, exp_loss, grad_norm, param_norm, iter_time))
if global_step % self.FLAGS.save_every == 0:
logging.info("Saving to %s..." % checkpoint_path)
self.saver.save(session, checkpoint_path, global_step=global_step)
if global_step % self.FLAGS.eval_every == 0:
dev_loss = self.get_dev_loss(session, dev_context_path, dev_qn_path, dev_ans_path)
logging.info("Epoch %d, Iter %d, dev loss: %f" % (epoch, global_step, dev_loss))
write_summary(dev_loss, "dev/loss", summary_writer, global_step)
train_f1, train_em = self.check_f1_em(session, train_context_path, train_qn_path, train_ans_path, "train", num_samples=1000)
logging.info("Epoch %d, Iter %d, Train F1 score: %f, Train EM score: %f" % (epoch, global_step, train_f1, train_em))
write_summary(train_f1, "train/F1", summary_writer, global_step)
write_summary(train_em, "train/EM", summary_writer, global_step)
dev_f1, dev_em = self.check_f1_em(session, dev_context_path, dev_qn_path, dev_ans_path, "dev", num_samples=0)
logging.info("Epoch %d, Iter %d, Dev F1 score: %f, Dev EM score: %f" % (epoch, global_step, dev_f1, dev_em))
write_summary(dev_f1, "dev/F1", summary_writer, global_step)
write_summary(dev_em, "dev/EM", summary_writer, global_step)
if best_dev_f1 is None or dev_f1 > best_dev_f1:
best_dev_f1 = dev_f1
logging.info("Saving to %s..." % bestmodel_ckpt_path)
self.bestmodel_saver.save(session, bestmodel_ckpt_path, global_step=global_step)
epoch_toc = time.time()
logging.info("End of epoch %i. Time for epoch: %f" % (epoch, epoch_toc-epoch_tic))
sys.stdout.flush()
def check_f1_em(self, session, context_path, qn_path, ans_path, dataset, num_samples=100, print_to_screen=False):
"""
Sample from the provided (train/dev) set.
For each sample, calculate F1 and EM score.
Return average F1 and EM score for all samples.
Optionally pretty-print examples.
Note: This function is not quite the same as the F1/EM numbers you get from "official_eval" mode.
This function uses the pre-processed version of the e.g. dev set for speed,
whereas "official_eval" mode uses the original JSON. Therefore:
1. official_eval takes your max F1/EM score w.r.t. the three reference answers,
whereas this function compares to just the first answer (which is what's saved in the preprocessed data)
2. Our preprocessed version of the dev set is missing some examples
due to tokenization issues (see squad_preprocess.py).
"official_eval" includes all examples.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
num_samples: int. How many samples to use. If num_samples=0 then do whole dataset.
print_to_screen: if True, pretty-prints each example to screen
Returns:
F1 and EM: Scalars. The average across the sampled examples.
"""
logging.info("Calculating F1/EM for %s examples in %s set..." % (str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
# Note here we select discard_long=False because we want to sample from the entire dataset
# That means we're truncating, rather than discarding, examples with too-long context or questions
for batch in get_batch_generator(self.word2id, context_path, qn_path, ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=False):
pred_start_pos, pred_end_pos = self.get_start_end_pos(session, batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
for ex_idx, (pred_ans_start, pred_ans_end, true_ans_tokens) in enumerate(zip(pred_start_pos, pred_end_pos, batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][pred_ans_start : pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
# Optionally pretty-print
if print_to_screen:
print_example(self.word2id, batch.context_tokens[ex_idx], batch.qn_tokens[ex_idx], batch.ans_span[ex_idx, 0], batch.ans_span[ex_idx, 1], pred_ans_start, pred_ans_end, true_answer, pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
toc = time.time()
logging.info("Calculating F1/EM for %i examples in %s set took %.2f seconds" % (example_num, dataset, toc-tic))
return f1_total, em_total
def train(self, session, train_context_path, train_qn_path, train_ans_path, dev_qn_path, dev_context_path, dev_ans_path):
"""
Main training loop.
Inputs:
session: TensorFlow session
{train/dev}_{qn/context/ans}_path: paths to {train/dev}.{context/question/answer} data files
"""
# Print number of model parameters
tic = time.time()
params = tf.trainable_variables()
num_params = sum(map(lambda t: np.prod(tf.shape(t.value()).eval()), params))
toc = time.time()
logging.info("Number of params: %d (retrieval took %f secs)" % (num_params, toc - tic))
# We will keep track of exponentially-smoothed loss
exp_loss = None
# Checkpoint management.
# We keep one latest checkpoint, and one best checkpoint (early stopping)
checkpoint_path = os.path.join(self.FLAGS.train_dir, "qa.ckpt")
bestmodel_dir = os.path.join(self.FLAGS.train_dir, "best_checkpoint")
bestmodel_ckpt_path = os.path.join(bestmodel_dir, "qa_best.ckpt")
best_dev_f1 = None
best_dev_em = None
# for TensorBoard
summary_writer = tf.summary.FileWriter(self.FLAGS.train_dir, session.graph)
epoch = 0
logging.info("Beginning training loop...")
while self.FLAGS.num_epochs == 0 or epoch < self.FLAGS.num_epochs:
epoch += 1
epoch_tic = time.time()
# Loop over batches
for batch in get_batch_generator(self.word2id, train_context_path, train_qn_path, train_ans_path, self.FLAGS.batch_size, context_len=self.FLAGS.context_len, question_len=self.FLAGS.question_len, discard_long=True):
# Run training iteration
iter_tic = time.time()
loss, global_step, param_norm, grad_norm = self.run_train_iter(session, batch, summary_writer)
iter_toc = time.time()
iter_time = iter_toc - iter_tic
# Update exponentially-smoothed loss
if not exp_loss: # first iter
exp_loss = loss
else:
exp_loss = 0.99 * exp_loss + 0.01 * loss
# Sometimes print info to screen
if global_step % self.FLAGS.print_every == 0:
logging.info(
'epoch %d, iter %d, loss %.5f, smoothed loss %.5f, grad norm %.5f, param norm %.5f, batch time %.3f' %
(epoch, global_step, loss, exp_loss, grad_norm, param_norm, iter_time))
# Sometimes save model
if global_step % self.FLAGS.save_every == 0:
logging.info("Saving to %s..." % checkpoint_path)
self.saver.save(session, checkpoint_path, global_step=global_step)
# Sometimes evaluate model on dev loss, train F1/EM and dev F1/EM
if global_step % self.FLAGS.eval_every == 0:
# Get loss for entire dev set and log to tensorboard
dev_loss = self.get_dev_loss(session, dev_context_path, dev_qn_path, dev_ans_path)
logging.info("Epoch %d, Iter %d, dev loss: %f" % (epoch, global_step, dev_loss))
write_summary(dev_loss, "dev/loss", summary_writer, global_step)
# Get F1/EM on train set and log to tensorboard
train_f1, train_em = self.check_f1_em(session, train_context_path, train_qn_path, train_ans_path, "train", num_samples=1000)
logging.info("Epoch %d, Iter %d, Train F1 score: %f, Train EM score: %f" % (epoch, global_step, train_f1, train_em))
write_summary(train_f1, "train/F1", summary_writer, global_step)
write_summary(train_em, "train/EM", summary_writer, global_step)
# Get F1/EM on dev set and log to tensorboard
dev_f1, dev_em = self.check_f1_em(session, dev_context_path, dev_qn_path, dev_ans_path, "dev", num_samples=0)
logging.info("Epoch %d, Iter %d, Dev F1 score: %f, Dev EM score: %f" % (epoch, global_step, dev_f1, dev_em))
write_summary(dev_f1, "dev/F1", summary_writer, global_step)
write_summary(dev_em, "dev/EM", summary_writer, global_step)
# Early stopping based on dev EM. You could switch this to use F1 instead.
if best_dev_em is None or dev_em > best_dev_em:
best_dev_em = dev_em
logging.info("Saving to %s..." % bestmodel_ckpt_path)
self.bestmodel_saver.save(session, bestmodel_ckpt_path, global_step=global_step)
epoch_toc = time.time()
logging.info("End of epoch %i. Time for epoch: %f" % (epoch, epoch_toc-epoch_tic))
sys.stdout.flush()
def train(self, model_file_path):
train_dir = os.path.join(config.log_root, 'train_%d' % (int(time.time())))
if not os.path.exists(train_dir):
os.mkdir(train_dir)
model_dir = os.path.join(train_dir, 'model')
if not os.path.exists(model_dir):
os.mkdir(model_dir)
bestmodel_dir = os.path.join(train_dir, 'bestmodel')
if not os.path.exists(bestmodel_dir):
os.makedirs(bestmodel_dir)
summary_writer = SummaryWriter(train_dir)
with open(os.path.join(train_dir, "flags.json"), 'w') as fout:
json.dump(vars(config), fout)
model = self.get_model(model_file_path)
params = list(filter(lambda p: p.requires_grad, model.parameters()))
optimizer = Adam(params, lr=config.lr, weight_decay=config.reg_lambda, amsgrad=True)
num_params = sum(p.numel() for p in params)
logging.info("Number of params: %d" % num_params)
exp_loss, best_dev_f1, best_dev_em = None, None, None
epoch = 0
global_step = 0
logging.info("Beginning training loop...")
while config.num_epochs == 0 or epoch < config.num_epochs:
epoch += 1
epoch_tic = time.time()
for batch in get_batch_generator(self.word2id, self.train_context_path,
self.train_qn_path, self.train_ans_path,
config.batch_size, context_len=config.context_len,
question_len=config.question_len, discard_long=True):
global_step += 1
iter_tic = time.time()
loss, param_norm, grad_norm = self.train_one_batch(batch, model, optimizer, params)
summary_writer.add_scalar("train/loss", loss, global_step)
iter_toc = time.time()
iter_time = iter_toc - iter_tic
if not exp_loss:
exp_loss = loss
else:
exp_loss = 0.99 * exp_loss + 0.01 * loss
if global_step % config.print_every == 0:
logging.info(
'epoch %d, iter %d, loss %.5f, smoothed loss %.5f, grad norm %.5f, param norm %.5f, batch time %.3f' %
(epoch, global_step, loss, exp_loss, grad_norm, param_norm, iter_time))
if global_step % config.save_every == 0:
logging.info("Saving to %s..." % model_dir)
self.save_model(model, optimizer, loss, global_step, epoch, model_dir)
if global_step % config.eval_every == 0:
dev_loss = self.get_dev_loss(model)
logging.info("Epoch %d, Iter %d, dev loss: %f" % (epoch, global_step, dev_loss))
summary_writer.add_scalar("dev/loss", dev_loss, global_step)
train_f1, train_em = self.check_f1_em(model, "train", num_samples=1000)
logging.info("Epoch %d, Iter %d, Train F1 score: %f, Train EM score: %f" % (
epoch, global_step, train_f1, train_em))
summary_writer.add_scalar("train/F1", train_f1, global_step)
summary_writer.add_scalar("train/EM", train_em, global_step)
dev_f1, dev_em = self.check_f1_em(model, "dev", num_samples=0)
logging.info(
"Epoch %d, Iter %d, Dev F1 score: %f, Dev EM score: %f" % (epoch, global_step, dev_f1, dev_em))
summary_writer.add_scalar("dev/F1", dev_f1, global_step)
summary_writer.add_scalar("dev/EM", dev_em, global_step)
if best_dev_f1 is None or dev_f1 > best_dev_f1:
best_dev_f1 = dev_f1
if best_dev_em is None or dev_em > best_dev_em:
best_dev_em = dev_em
logging.info("Saving to %s..." % bestmodel_dir)
self.save_model(model, optimizer, loss, global_step, epoch, bestmodel_dir)
epoch_toc = time.time()
logging.info("End of epoch %i. Time for epoch: %f" % (epoch, epoch_toc - epoch_tic))
sys.stdout.flush()
def train(self, session):
"""
Main training loop.
"""
# Print number of model parameters
tic = time.time()
params = tf.trainable_variables()
num_params = sum(map(lambda t: np.prod(tf.shape(t.value()).eval()), params))
toc = time.time()
logging.info("Number of params: %d (retrieval took %f secs)" % (num_params, toc - tic))
print(params) # For debugging purpose
# We will keep track of exponentially-smoothed loss
exp_loss = None
# Checkpoint management. We keep one latest checkpoint, and one best checkpoint (early stopping)
checkpoint_path = os.path.join(self.FLAGS.train_dir, "latest.ckpt")
bestmodel_dir = self.FLAGS.bestmodel_dir
bestmodel_ckpt_path = os.path.join(bestmodel_dir, "best.ckpt")
best_val_metric = None
# For TensorBoard
summary_writer = tf.summary.FileWriter(self.FLAGS.train_dir, session.graph)
epoch = 0
logging.info("Beginning training loop...")
while self.FLAGS.num_epochs == 0 or epoch < self.FLAGS.num_epochs:
epoch += 1
epoch_tic = time.time()
# Loop over batches
for batch in get_batch_generator(self.word2id, self.img_features_map, self.train_caption_id_2_caption,
self.caption_id_2_img_id, self.FLAGS.batch_size, self.FLAGS.max_caption_len, 'train', None, self.FLAGS.data_source):
# Run training iteration
iter_tic = time.time()
loss, global_step, param_norm, grad_norm = self.run_train_iter(session, batch, summary_writer)
iter_toc = time.time()
iter_time = iter_toc - iter_tic
# Update exponentially-smoothed loss
if not exp_loss: # first iter
exp_loss = loss
else:
exp_loss = 0.99 * exp_loss + 0.01 * loss
# Sometimes print info to screen
if global_step % self.FLAGS.print_every == 0:
logging.info(
'epoch %d, iter %d, loss %.5f, smoothed loss %.5f, grad norm %.5f, param norm %.5f, batch time %.3f' %
(epoch, global_step, loss, exp_loss, grad_norm, param_norm, iter_time))
write_summary(loss, "train/loss", summary_writer, global_step)
# Sometimes save model
if global_step % self.FLAGS.save_every == 0:
logging.info("Saving to %s..." % checkpoint_path)
self.saver.save(session, checkpoint_path, global_step=global_step)
# Sometimes evaluate the model
if global_step % self.FLAGS.eval_every == 0:
# Get loss for entire val set and log to tensorboard
val_loss = self.get_val_loss(session)
logging.info("Epoch %d, Iter %d, Val loss: %f" % (epoch, global_step, val_loss))
write_summary(val_loss, "val/loss", summary_writer, global_step)
# Evaluate on val set and log all the metrics to tensorboard
val_scores = self.check_metric(session, mode='val', num_samples=0)
val_metric = val_scores[self.FLAGS.primary_metric]
for metric_name, metric_score in val_scores.items():
logging.info("Epoch {}, Iter {}, Val {}: {}".format(epoch, global_step, metric_name, metric_score))
write_summary(metric_score, "val/"+metric_name, summary_writer, global_step)
# Early stopping based on val evaluation
if best_val_metric is None or val_metric > best_val_metric:
best_val_metric = val_metric
logging.info("Saving to %s..." % bestmodel_ckpt_path)
self.bestmodel_saver.save(session, bestmodel_ckpt_path, global_step=global_step)
epoch_toc = time.time()
logging.info("End of epoch %i. Time for epoch: %f" % (epoch, epoch_toc-epoch_tic))
sys.stdout.flush()
def visualize_results(self,
session,
context_path,
qn_path,
ans_path,
dataset,
num_samples=100,
print_to_screen=False):
logging.info(
"Calculating F1/EM for %s examples in %s set..." %
(str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
# Note here we select discard_long=False because we want to sample from the entire dataset
# That means we're truncating, rather than discarding, examples with too-long context or questions
for batch in get_batch_generator(self.word2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=False):
pred_start_pos, pred_end_pos, c2q_attn, q2c_attn, strt_logts, end_logts = self.get_results_vis(
session, batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
q2c_attn = np.argmax(q2c_attn, axis=1)
q2c_attn = q2c_attn.tolist()
fig = plt.figure()
gs = grd.GridSpec(3, 1, height_ratios=[1, 3, 1])
ax = plt.subplot(gs[1])
c2q_attn_plt = c2q_attn[
0, :len(batch.context_tokens[0]), :len(batch.qn_tokens[0])]
p = ax.imshow(np.transpose(c2q_attn_plt),
interpolation='nearest',
aspect='auto')
plt.ylabel('c2q attn')
plt.xlim(0, len(batch.context_tokens[0]))
ax2 = plt.subplot(gs[0])
ax2.plot(strt_logts[0, :len(batch.context_tokens[0])])
plt.ylabel('start logits')
plt.xlim(0, len(batch.context_tokens[0]))
ax3 = plt.subplot(gs[2])
ax3.plot(end_logts[0, :len(batch.context_tokens[0])])
plt.ylabel('end logits')
plt.xlim(0, len(batch.context_tokens[0]))
plt.savefig('c2q_attn.png')
plt.clf()
for ex_idx, (pred_ans_start, pred_ans_end, true_ans_tokens,
q2c_attn_idx) in enumerate(
zip(pred_start_pos, pred_end_pos,
batch.ans_tokens, q2c_attn)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][
pred_ans_start:pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
qn_attn_words = [
batch.context_tokens[ex_idx][i]
for i in q2c_attn_idx[:len(batch.qn_tokens[ex_idx])]
]
qn_attn = " ".join(qn_attn_words)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
# Optionally pretty-print
if print_to_screen:
print_example_attn(self.word2id,
batch.context_tokens[ex_idx],
batch.qn_tokens[ex_idx], qn_attn,
batch.ans_span[ex_idx, 0],
batch.ans_span[ex_idx, 1],
pred_ans_start, pred_ans_end,
true_answer, pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
toc = time.time()
logging.info(
"Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, dataset, toc - tic))
return f1_total, em_total
def check_f1_em(self,
session,
context_path,
qn_path,
ans_path,
dataset,
num_samples=100,
print_to_screen=False):
"""
Sample from the provided (train/dev) set.
For each sample, calculate F1 and EM score.
Return average F1 and EM score for all samples.
Optionally pretty-print examples.
Note: This function is not quite the same as the F1/EM numbers you get from "official_eval" mode.
This function uses the pre-processed version of the e.g. dev set for speed,
whereas "official_eval" mode uses the original JSON. Therefore:
1. official_eval takes your max F1/EM score w.r.t. the three reference answers,
whereas this function compares to just the first answer (which is what's saved in the preprocessed data)
2. Our preprocessed version of the dev set is missing some examples
due to tokenization issues (see squad_preprocess.py).
"official_eval" includes all examples.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
num_samples: int. How many samples to use. If num_samples=0 then do whole dataset.
print_to_screen: if True, pretty-prints each example to screen
Returns:
F1 and EM: Scalars. The average across the sampled examples.
"""
logging.info(
"Calculating F1/EM for %s examples in %s set..." %
(str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
# Note here we select discard_long=False because we want to sample from the entire dataset
# That means we're truncating, rather than discarding, examples with too-long context or questions
for batch in get_batch_generator(self.word2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=False):
pred_start_pos, pred_end_pos = self.get_start_end_pos(
session, batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
for ex_idx, (pred_ans_start, pred_ans_end,
true_ans_tokens) in enumerate(
zip(pred_start_pos, pred_end_pos,
batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][
pred_ans_start:pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
# Optionally pretty-print
if print_to_screen:
print_example(self.word2id, batch.context_tokens[ex_idx],
batch.qn_tokens[ex_idx],
batch.ans_span[ex_idx,
0], batch.ans_span[ex_idx, 1],
pred_ans_start, pred_ans_end, true_answer,
pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
toc = time.time()
logging.info(
"Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, dataset, toc - tic))
return f1_total, em_total
def check_f1_em(self,
session,
context_path,
qn_path,
ans_path,
dataset,
num_samples=100,
print_to_screen=False):
logging.info(
"Calculating F1/EM for %s examples in %s set..." %
(str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
# Note here we select discard_long=False because we want to sample from the entire dataset
# That means we're truncating, rather than discarding, examples with too-long context or questions
for batch in get_batch_generator(self.word2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=False):
pred_start_pos, pred_end_pos = self.get_start_end_pos(
session, batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
for ex_idx, (pred_ans_start, pred_ans_end,
true_ans_tokens) in enumerate(
zip(pred_start_pos, pred_end_pos,
batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][
pred_ans_start:pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
f1_total += f1
em_total += em
# Optionally pretty-print
if print_to_screen:
print_example(self.word2id, batch.context_tokens[ex_idx],
batch.qn_tokens[ex_idx],
batch.ans_span[ex_idx,
0], batch.ans_span[ex_idx, 1],
pred_ans_start, pred_ans_end, true_answer,
pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
toc = time.time()
logging.info(
"Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, dataset, toc - tic))
return f1_total, em_total
def get_error_stats(self,
session,
context_path,
qn_path,
ans_path,
dataset,
num_samples=10,
print_to_screen=False):
"""
Sample from the provided (train/dev) set.
For each sample, calculate F1 and EM score.
Return average F1 and EM score for all samples.
Optionally pretty-print examples.
Note: This function is not quite the same as the F1/EM numbers you get from "official_eval" mode.
This function uses the pre-processed version of the e.g. dev set for speed,
whereas "official_eval" mode uses the original JSON. Therefore:
1. official_eval takes your max F1/EM score w.r.t. the three reference answers,
whereas this function compares to just the first answer (which is what's saved in the preprocessed data)
2. Our preprocessed version of the dev set is missing some examples
due to tokenization issues (see squad_preprocess.py).
"official_eval" includes all examples.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
num_samples: int. How many samples to use. If num_samples=0 then do whole dataset.
print_to_screen: if True, pretty-prints each example to screen
Returns:
F1 and EM: Scalars. The average across the sampled examples.
"""
logging.info(
"Calculating Error stats for %s examples in %s set..." %
(str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
example_num = 0
tic = time.time()
# Note here we select discard_long=False because we want to sample from the entire dataset
# That means we're truncating, rather than discarding, examples with too-long context or questions
first_token_qn_dict_wrong = defaultdict(float)
first_token_qn_dict_total = defaultdict(float)
first_token_qn_dict_f1 = defaultdict(float)
for batch in get_batch_generator(self.word2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=False):
pred_start_pos, pred_end_pos = self.get_start_end_pos(
session, batch)
# Convert the start and end positions to lists length batch_size
pred_start_pos = pred_start_pos.tolist() # list length batch_size
pred_end_pos = pred_end_pos.tolist() # list length batch_size
for ex_idx, (pred_ans_start, pred_ans_end,
true_ans_tokens) in enumerate(
zip(pred_start_pos, pred_end_pos,
batch.ans_tokens)):
example_num += 1
# Get the predicted answer
# Important: batch.context_tokens contains the original words (no UNKs)
# You need to use the original no-UNK version when measuring F1/EM
pred_ans_tokens = batch.context_tokens[ex_idx][
pred_ans_start:pred_ans_end + 1]
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens)
# Calc F1/EM
f1 = f1_score(pred_answer, true_answer)
em = exact_match_score(pred_answer, true_answer)
first_token_qn = batch.qn_tokens[ex_idx][0]
first_token_qn_dict_total[first_token_qn] += 1
#print 'example_num: ', example_num
#print 'total words seen in first_token_qn_dict: ', sum(first_token_qn_dict_total.itervalues())
if not em:
#we have found an error:
#get first token of error question:
first_token_qn_dict_wrong[first_token_qn] += 1
f1_total += f1
first_token_qn_dict_f1[first_token_qn] += f1
em_total += em
# Optionally pretty-print
if print_to_screen:
print_example(self.word2id, batch.context_tokens[ex_idx],
batch.qn_tokens[ex_idx],
batch.ans_span[ex_idx,
0], batch.ans_span[ex_idx, 1],
pred_ans_start, pred_ans_end, true_answer,
pred_answer, f1, em)
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
print 'total words: ', sum(first_token_qn_dict_total.itervalues())
toc = time.time()
logging.info(
"Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, dataset, toc - tic))
final_freq_dict = {}
for token, count in sorted(first_token_qn_dict_total.iteritems(),
key=lambda (k, v): (v, k)):
#key is fist token of question, value is how many times that token occurs
freq = first_token_qn_dict_wrong[
token] / first_token_qn_dict_total[token]
f1 = first_token_qn_dict_f1[token] / first_token_qn_dict_total[
token]
print "When first token is: [", token, "] f1:", f1, "We got : ", first_token_qn_dict_wrong[
token], " wrong exact match out of ", first_token_qn_dict_total[
token], " percentage of 1st tokens that are this token: ", first_token_qn_dict_total[
token] / sum(first_token_qn_dict_total.itervalues(
)), " precentage of this token WRONG: ", freq
print('em_total:', em_total)
print('f1_total:', f1_total)
return f1_total, em_total
def check_f1_em(self,
session,
context_path,
qn_path,
ans_path,
dataset,
num_samples=10,
print_to_screen=False,
write_out=False,
file_out=None,
shuffle=True):
"""
Sample from the provided (train/dev) set.
For each sample, calculate F1 and EM score.
Return average F1 and EM score for all samples.
Optionally pretty-print examples.
Inputs:
session: TensorFlow session
qn_path, context_path, ans_path: paths to {dev/train}.{question/context/answer} data files.
dataset: string. Either "train" or "dev". Just for logging purposes.
num_samples: int. How many samples to use. If num_samples=0 then do whole dataset.
print_to_screen: if True, pretty-prints each example to screen
Returns:
F1 and EM: Scalars. The average across the sampled examples.
"""
logging.info(
"Calculating F1/EM for %s examples in %s set..." %
(str(num_samples) if num_samples != 0 else "all", dataset))
f1_total = 0.
em_total = 0.
ed_total = 0.
rough_em_total = 0.
example_num = 0
tic = time.time()
ans_list = []
graph_route_info = []
# Note here we select discard_long=False because we want to sample from the entire dataset
# That means we're truncating, rather than discarding, examples with too-long context or questions
for batch in get_batch_generator(
self.word2id,
self.context2id,
self.ans2id,
context_path,
qn_path,
ans_path,
self.FLAGS.batch_size,
self.graph_vocab_class,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
answer_len=self.FLAGS.answer_len,
discard_long=False,
use_raw_graph=self.FLAGS.use_raw_graph,
shuffle=shuffle,
show_start_tokens=self.FLAGS.show_start_tokens,
output_goal=True):
train_ids, pred_ids, dev_final_states, pred_logits = self.get_prob_dists(
session, batch)
start_ids = batch.ans_ids[:, 0].reshape(-1)
graph_length = np.sum(batch.context_mask, axis=1)
if self.FLAGS.pred_method != 'beam':
pred_ids, confidence_score, ans_str = verify_route(
start_ids, pred_logits, batch.context_tokens, self.ans2id,
self.id2ans, self.FLAGS.answer_len)
f1_scores, em_scores, ed_scores, gm_scores = [], [], [], []
pred_ids = pred_ids.tolist() # the output of using test network
for ex_idx, (pred_ans_list, true_ans_tokens) in enumerate(
zip(pred_ids, list(batch.ans_tokens))):
example_num += 1
pred_ans_tokens = []
for id in pred_ans_list:
if id == PAD_ID:
break
else:
pred_ans_tokens.append(self.id2ans[id])
pred_answer = " ".join(pred_ans_tokens)
# Get true answer (no UNKs)
true_answer = " ".join(true_ans_tokens[:])
# Calculate metrics
f1, em, edit_dist, goal_match = compute_all_metrics(
pred_ans_tokens, true_ans_tokens)
f1_scores.append(f1)
em_scores.append(em)
ed_scores.append(edit_dist)
gm_scores.append(goal_match)
f1_total += f1
em_total += em
ed_total += edit_dist
rough_em_total += goal_match
ans_list.append(pred_answer)
graph_route_info.append(
(str(int(graph_length[ex_idx])),
str(len(true_ans_tokens[1:-1])), str(int(em))))
# Optionally pretty-print
if print_to_screen:
print_example(self.word2id, self.context2id, self.ans2id,
batch.context_tokens[ex_idx],
batch.qn_tokens[ex_idx], true_answer,
pred_answer, f1, em, edit_dist,
confidence_score[ex_idx])
if num_samples != 0 and example_num >= num_samples:
break
if num_samples != 0 and example_num >= num_samples:
break
f1_total /= example_num
em_total /= example_num
ed_total /= example_num
rough_em_total /= example_num
toc = time.time()
logging.info(
"Calculating F1/EM for %i examples in %s set took %.2f seconds" %
(example_num, dataset, toc - tic))
if write_out:
logging.info("Writing the prediction to {}".format(file_out))
with open(file_out, 'w') as f:
for line, extra_info in zip(ans_list, graph_route_info):
f.write(line + " " + " ".join(extra_info) + '\n')
print("Wrote predictions to %s" % file_out)
em_file = "em_" + str(file_out)
logging.info("Writing EM scores to {}".format(em_file))
with open(em_file, 'w') as f:
for em in em_scores:
f.write(str(em) + '\n')
print("Wrote EM Scores to %s" % em_file)
ed_file = "ed_" + str(file_out)
logging.info("Writing ED scores to {}".format(ed_file))
with open(ed_file, 'w') as f:
for ed in ed_scores:
f.write(str(ed) + '\n')
print("Wrote ED Scores to %s" % ed_file)
gm_file = "gm_" + str(file_out)
logging.info("Writing GM scores to {}".format(gm_file))
with open(gm_file, 'w') as f:
for gm in gm_scores:
f.write(str(gm) + '\n')
print("Wrote GM Scores to %s" % gm_file)
return f1_total, em_total, ed_total, rough_em_total
def main():
print("Your TensorFlow version: %s" % tf.__version__)
# Define train_dir
if not FLAGS.experiment_name and not FLAGS.train_dir and FLAGS.mode != "official_eval":
raise Exception(
"You need to specify either --experiment_name or --train_dir")
FLAGS.train_dir = FLAGS.train_dir or os.path.join(EXPERIMENTS_DIR,
FLAGS.experiment_name)
bestmodel_dir = os.path.join(FLAGS.train_dir, "best_checkpoint")
# Define path for glove vecs
FLAGS.glove_path = FLAGS.glove_path or os.path.join(
DEFAULT_DATA_DIR + "/glove.6B/", "glove.6B.{}d.txt".format(
FLAGS.embedding_size))
# Load embedding matrix and vocab mappings
emb_matrix, word2id, id2word = get_glove(FLAGS.glove_path,
FLAGS.embedding_size)
# Get filepaths to train/dev datafiles for tokenized queries, contexts and answers
train_context_path = os.path.join(FLAGS.data_dir, "train.context")
train_qn_path = os.path.join(FLAGS.data_dir, "train.question")
train_ans_path = os.path.join(FLAGS.data_dir, "train.span")
dev_context_path = os.path.join(FLAGS.data_dir, "dev.context")
dev_qn_path = os.path.join(FLAGS.data_dir, "dev.question")
dev_ans_path = os.path.join(FLAGS.data_dir, "dev.span")
global_step = 1
epoch = 0
print("Beginning training loop...")
# Initialize model
model = QAModel(FLAGS, id2word, word2id, emb_matrix)
optimizer = tf.keras.optimizers.Adam(learning_rate=FLAGS.learning_rate)
while FLAGS.num_epochs == 0 or epoch < FLAGS.num_epochs:
epoch += 1
epoch_tic = time.time()
for batch in get_batch_generator( \
word2id, train_context_path, train_qn_path, \
train_ans_path, FLAGS.batch_size, context_len=FLAGS.context_len, \
question_len=FLAGS.question_len, discard_long=True):
# print(batch.ans_span)
with tf.GradientTape() as tape:
prob_start, prob_end = model([
batch.context_ids, batch.context_mask, batch.qn_ids,
batch.qn_mask
])
# prob_start, prob_end = model(batch.context_ids, batch.context_mask, batch.qn_ids, batch.qn_mask)
loss_start = tf.nn.sparse_softmax_cross_entropy_with_logits(
logits=prob_start, labels=batch.ans_span[:, 0])
loss_start = tf.reduce_mean(loss_start)
loss_end = tf.nn.sparse_softmax_cross_entropy_with_logits(
logits=prob_end, labels=batch.ans_span[:, 1])
loss_end = tf.reduce_mean(loss_end)
loss = loss_start + loss_end
# print("loss %f" % (loss.numpy()))
grads = tape.gradient(loss, model.variables)
optimizer.apply_gradients(
grads_and_vars=zip(grads, model.variables))
if global_step % FLAGS.eval_every == 0:
print("==== start evaluating ==== ")
dev_f1, dev_em = evaluate(model, word2id, FLAGS,
dev_context_path, dev_qn_path,
dev_ans_path)
print("Epoch %d, Iter %d, Dev F1 score: %f, Dev EM score: %f" %
(epoch, global_step, dev_f1, dev_em))
print("==========================")
global_step += 1
epoch_toc = time.time()
print("End of epoch %i. Time for epoch: %f" %
(epoch, epoch_toc - epoch_tic))
sys.stdout.flush()
def train(self, session, train_context_path, train_qn_path, train_ans_path,
dev_qn_path, dev_context_path, dev_ans_path):
"""
Main training loop.
Inputs:
session: TensorFlow session
{train/dev}_{qn/context/ans}_path: paths to {train/dev}.{context/question/answer} data files
"""
# Print number of model parameters
tic = time.time()
params = tf.trainable_variables()
num_params = sum(
map(lambda t: np.prod(tf.shape(t.value()).eval()), params))
toc = time.time()
logging.info("Number of params: %d (retrieval took %f secs)" %
(num_params, toc - tic))
# We will keep track of exponentially-smoothed loss
exp_loss = None
# Checkpoint management.
# We keep one latest checkpoint, and one best checkpoint (early stopping)
checkpoint_path = os.path.join(self.FLAGS.train_dir, "qa.ckpt")
bestmodel_dir = os.path.join(self.FLAGS.train_dir, "best_checkpoint")
bestmodel_ckpt_path = os.path.join(bestmodel_dir, "qa_best.ckpt")
best_dev_f1 = None
best_dev_em = None
# for TensorBoard
summary_writer = tf.summary.FileWriter(self.FLAGS.train_dir,
session.graph)
epoch = 0
logging.info("Beginning training loop...")
while self.FLAGS.num_epochs == 0 or epoch < self.FLAGS.num_epochs:
epoch += 1
epoch_tic = time.time()
# Loop over batches
for batch in get_batch_generator(
self.word2id,
train_context_path,
train_qn_path,
train_ans_path,
self.FLAGS.batch_size,
context_len=self.FLAGS.context_len,
question_len=self.FLAGS.question_len,
discard_long=True):
# Run training iteration
iter_tic = time.time()
loss, global_step, param_norm, grad_norm = self.run_train_iter(
session, batch, summary_writer)
iter_toc = time.time()
iter_time = iter_toc - iter_tic
# Update exponentially-smoothed loss
if not exp_loss: # first iter
exp_loss = loss
else:
exp_loss = 0.99 * exp_loss + 0.01 * loss
# Sometimes print info to screen
if global_step % self.FLAGS.print_every == 0:
logging.info(
'epoch %d, iter %d, loss %.5f, smoothed loss %.5f, grad norm %.5f, param norm %.5f, batch time %.3f'
% (epoch, global_step, loss, exp_loss, grad_norm,
param_norm, iter_time))
# Sometimes save model
if global_step % self.FLAGS.save_every == 0:
logging.info("Saving to %s..." % checkpoint_path)
self.saver.save(session,
checkpoint_path,
global_step=global_step)
# Sometimes evaluate model on dev loss, train F1/EM and dev F1/EM
if global_step % self.FLAGS.eval_every == 0:
# Get loss for entire dev set and log to tensorboard
dev_loss = self.get_dev_loss(session, dev_context_path,
dev_qn_path, dev_ans_path)
logging.info("Epoch %d, Iter %d, dev loss: %f" %
(epoch, global_step, dev_loss))
write_summary(dev_loss, "dev/loss", summary_writer,
global_step)
# Get F1/EM on train set and log to tensorboard
train_f1, train_em = self.check_f1_em(session,
train_context_path,
train_qn_path,
train_ans_path,
"train",
num_samples=1000)
logging.info(
"Epoch %d, Iter %d, Train F1 score: %f, Train EM score: %f"
% (epoch, global_step, train_f1, train_em))
write_summary(train_f1, "train/F1", summary_writer,
global_step)
write_summary(train_em, "train/EM", summary_writer,
global_step)
# Get F1/EM on dev set and log to tensorboard
dev_f1, dev_em = self.check_f1_em(session,
dev_context_path,
dev_qn_path,
dev_ans_path,
"dev",
num_samples=0)
logging.info(
"Epoch %d, Iter %d, Dev F1 score: %f, Dev EM score: %f"
% (epoch, global_step, dev_f1, dev_em))
write_summary(dev_f1, "dev/F1", summary_writer,
global_step)
write_summary(dev_em, "dev/EM", summary_writer,
global_step)
# Early stopping based on dev EM. You could switch this to use F1 instead.
if best_dev_em is None or dev_em > best_dev_em:
best_dev_em = dev_em
logging.info("Saving to %s..." % bestmodel_ckpt_path)
self.bestmodel_saver.save(session,
bestmodel_ckpt_path,
global_step=global_step)
epoch_toc = time.time()
logging.info("End of epoch %i. Time for epoch: %f" %
(epoch, epoch_toc - epoch_tic))
sys.stdout.flush()
if __name__ == "__main__":
logits_start, probdist_start, logits_end, probdist_end = build_graph()
# run the program
with tf.Session() as sess:
# It is necessary to initialize variables once before running inference.
sess.run(tf.global_variables_initializer())
#sess = tf_debug.LocalCLIDebugWrapperSession(sess)
for batch in get_batch_generator(word2id,
char2id,
train_context_path,
train_qn_path,
train_ans_path,
batch_size,
context_len,
question_len,
max_word_len,
discard_long=True):
# Create batches of data.
input_feed = {}
input_feed[context_elmo] = batcher.batch_sentences(
batch.context_tokens)
input_feed[question_elmo] = batcher.batch_sentences(
batch.qn_tokens)
input_feed[context_ids] = batch.context_ids
input_feed[context_mask] = batch.context_mask
input_feed[qn_ids] = batch.qn_ids
input_feed[qn_mask] = batch.qn_mask
