def get_mention_emb(self, text_emb, text_outputs, mention_starts,
mention_ends):
mention_emb_list = []
mention_start_emb = tf.gather(text_outputs,
mention_starts) # [num_mentions, emb]
mention_emb_list.append(mention_start_emb)
mention_end_emb = tf.gather(text_outputs,
mention_ends) # [num_mentions, emb]
mention_emb_list.append(mention_end_emb)
mention_width = 1 + mention_ends - mention_starts # [num_mentions]
if self.config["use_features"]:
mention_width_index = mention_width - 1 # [num_mentions]
mention_width_emb = tf.gather(
tf.get_variable("mention_width_embeddings", [
self.config["max_mention_width"],
self.config["feature_size"]
]), mention_width_index) # [num_mentions, emb]
mention_width_emb = tf.nn.dropout(mention_width_emb, self.dropout)
mention_emb_list.append(mention_width_emb)
if self.config["model_heads"]:
mention_indices = tf.expand_dims(
tf.range(
self.config["max_mention_width"]), 0) + tf.expand_dims(
mention_starts, 1) # [num_mentions, max_mention_width]
mention_indices = tf.minimum(
util.shape(text_outputs, 0) - 1,
mention_indices) # [num_mentions, max_mention_width]
mention_text_emb = tf.gather(
text_emb,
mention_indices) # [num_mentions, max_mention_width, emb]
self.head_scores = util.projection(text_outputs,
1) # [num_words, 1]
mention_head_scores = tf.gather(
self.head_scores,
mention_indices) # [num_mentions, max_mention_width, 1]
mention_mask = tf.expand_dims(
tf.sequence_mask(mention_width,
self.config["max_mention_width"],
dtype=tf.float32),
2) # [num_mentions, max_mention_width, 1]
mention_attention = tf.nn.softmax(
mention_head_scores + tf.log(mention_mask),
dim=1) # [num_mentions, max_mention_width, 1]
mention_head_emb = tf.reduce_sum(
mention_attention * mention_text_emb, 1) # [num_mentions, emb]
mention_emb_list.append(mention_head_emb)
mention_emb = tf.concat(mention_emb_list, 1) # [num_mentions, emb]
return mention_emb
def flatten_emb_by_sentence(self, emb, text_len_mask):
num_sentences = tf.shape(emb)[0]
max_sentence_length = tf.shape(emb)[1]
emb_rank = len(emb.get_shape())
if emb_rank == 2:
flattened_emb = tf.reshape(emb,
[num_sentences * max_sentence_length])
elif emb_rank == 3:
flattened_emb = tf.reshape(
emb, [num_sentences * max_sentence_length,
util.shape(emb, 2)])
else:
raise ValueError("Unsupported rank: {}".format(emb_rank))
return tf.boolean_mask(flattened_emb, text_len_mask)
def get_antecedent_scores(self, mention_emb, mention_scores, antecedents,
antecedents_len, mention_starts, mention_ends,
mention_speaker_ids, genre_emb, k):
num_mentions = util.shape(mention_emb, 0)
max_antecedents = util.shape(antecedents, 1)
feature_emb_list = []
if self.config["use_metadata"]:
antecedent_speaker_ids = tf.gather(
mention_speaker_ids, antecedents) # [num_mentions, max_ant]
same_speaker = tf.equal(
tf.expand_dims(mention_speaker_ids, 1),
antecedent_speaker_ids) # [num_mentions, max_ant]
speaker_pair_emb = tf.gather(
tf.get_variable("same_speaker_emb",
[2, self.config["feature_size"]]),
tf.to_int32(same_speaker)) # [num_mentions, max_ant, emb]
feature_emb_list.append(speaker_pair_emb)
tiled_genre_emb = tf.tile(
tf.expand_dims(tf.expand_dims(genre_emb, 0), 0),
[num_mentions, max_antecedents, 1
]) # [num_mentions, max_ant, emb]
feature_emb_list.append(tiled_genre_emb)
if self.config["use_features"]:
target_indices = tf.range(num_mentions) # [num_mentions]
mention_distance = tf.expand_dims(
target_indices, 1) - antecedents # [num_mentions, max_ant]
mention_distance_bins = coref_ops.distance_bins(
mention_distance) # [num_mentions, max_ant]
mention_distance_bins.set_shape([None, None])
mention_distance_emb = tf.gather(
tf.get_variable("mention_distance_emb",
[10, self.config["feature_size"]]),
mention_distance_bins) # [num_mentions, max_ant]
feature_emb_list.append(mention_distance_emb)
feature_emb = tf.concat(feature_emb_list,
2) # [num_mentions, max_ant, emb]
feature_emb = tf.nn.dropout(
feature_emb, self.dropout) # [num_mentions, max_ant, emb]
span_emb = tf.expand_dims(mention_emb, 0)
antecedent_scores = self.rgcn_tagging(span_emb, mention_scores,
feature_emb,
k) # [1, num_words, 100] ?
self.scores = antecedent_scores
'''
antecedent_emb = tf.gather(mention_emb, antecedents) # [num_mentions, max_ant, emb]
self.mention_emb_shape = tf.shape(mention_emb)
self.mention_start_shape = tf.shape(antecedents)
target_emb_tiled = tf.tile(tf.expand_dims(mention_emb, 1), [1, max_antecedents, 1]) # [num_mentions, max_ant, emb]
similarity_emb = antecedent_emb * target_emb_tiled # [num_mentions, max_ant, emb]
pair_emb = tf.concat([target_emb_tiled, antecedent_emb, similarity_emb, feature_emb], 2) # [num_mentions, max_ant, emb]
with tf.variable_scope("iteration"):
with tf.variable_scope("antecedent_scoring"):
antecedent_scores = util.ffnn(pair_emb, self.config["ffnn_depth"], self.config["ffnn_size"], 1, self.dropout) # [num_mentions, max_ant, 1]
antecedent_scores = tf.squeeze(antecedent_scores, 2) # [num_mentions, max_ant]
antecedent_mask = tf.log(tf.sequence_mask(antecedents_len, max_antecedents, dtype=tf.float32)) # [num_mentions, max_ant]
antecedent_scores += antecedent_mask # [num_mentions, max_ant]
antecedent_scores += tf.expand_dims(mention_scores, 1) + tf.gather(mention_scores, antecedents) # [num_mentions, max_ant]
antecedent_scores = tf.concat([tf.zeros([util.shape(mention_scores, 0), 1]), antecedent_scores], 1) # [num_mentions, max_ant + 1]
'''
return antecedent_scores # [num_mentions, max_ant + 1]
def get_predictions_and_loss(self, word_emb, char_index, text_len,
speaker_ids, genre, is_training, gold_starts,
gold_ends, cluster_ids):
self.gold_starts = gold_starts
self.gold_ends = gold_ends
self.cluster_ids = cluster_ids
self.dropout = 1 - (tf.to_float(is_training) *
self.config["dropout_rate"])
self.lexical_dropout = 1 - (tf.to_float(is_training) *
self.config["lexical_dropout_rate"])
num_sentences = tf.shape(word_emb)[0]
max_sentence_length = tf.shape(word_emb)[1]
text_emb_list = [word_emb]
if self.config["char_embedding_size"] > 0:
char_emb = tf.gather(
tf.get_variable(
"char_embeddings",
[len(self.char_dict), self.config["char_embedding_size"]]),
char_index
) # [num_sentences, max_sentence_length, max_word_length, emb]
flattened_char_emb = tf.reshape(char_emb, [
num_sentences * max_sentence_length,
util.shape(char_emb, 2),
util.shape(char_emb, 3)
]) # [num_sentences * max_sentence_length, max_word_length, emb]
flattened_aggregated_char_emb = util.cnn(
flattened_char_emb, self.config["filter_widths"],
self.config["filter_size"]
) # [num_sentences * max_sentence_length, emb]
aggregated_char_emb = tf.reshape(flattened_aggregated_char_emb, [
num_sentences, max_sentence_length,
util.shape(flattened_aggregated_char_emb, 1)
]) # [num_sentences, max_sentence_length, emb]
text_emb_list.append(aggregated_char_emb)
text_emb = tf.concat(text_emb_list, 2)
text_emb = tf.nn.dropout(text_emb, self.lexical_dropout)
text_len_mask = tf.sequence_mask(text_len, maxlen=max_sentence_length)
text_len_mask = tf.reshape(text_len_mask,
[num_sentences * max_sentence_length])
# self.text_len_mask = text_len_mask[0]
text_outputs = self.encode_sentences(text_emb, text_len, text_len_mask)
text_outputs = tf.nn.dropout(text_outputs, self.dropout)
genre_emb = tf.gather(
tf.get_variable("genre_embeddings",
[len(self.genres), self.config["feature_size"]]),
genre) # [emb]
sentence_indices = tf.tile(
tf.expand_dims(tf.range(num_sentences), 1),
[1, max_sentence_length]) # [num_sentences, max_sentence_length]
flattened_sentence_indices = self.flatten_emb_by_sentence(
sentence_indices, text_len_mask) # [num_words]
flattened_text_emb = self.flatten_emb_by_sentence(
text_emb, text_len_mask) # [num_words]
self.flattened_sentence_indices = flattened_sentence_indices
candidate_starts, candidate_ends = coref_ops.spans(
sentence_indices=flattened_sentence_indices,
max_width=self.max_mention_width)
candidate_starts.set_shape([None])
candidate_ends.set_shape([None])
candidate_mention_emb = self.get_mention_emb(
flattened_text_emb, text_outputs, candidate_starts,
candidate_ends) # [num_candidates, emb]
candidate_mention_scores = self.get_mention_scores(
candidate_mention_emb) # [num_mentions, 1]
candidate_mention_scores = tf.squeeze(candidate_mention_scores,
1) # [num_mentions]
k = tf.to_int32(
tf.floor(
tf.to_float(tf.shape(text_outputs)[0]) *
self.config["mention_ratio"]))
k = tf.minimum(k, self.config["max_antecedents"])
predicted_mention_indices = coref_ops.extract_mentions(
candidate_mention_scores, candidate_starts, candidate_ends,
k) # ([k], [k])
predicted_mention_indices.set_shape([None])
mention_starts = tf.gather(candidate_starts,
predicted_mention_indices) # [num_mentions]
mention_ends = tf.gather(candidate_ends,
predicted_mention_indices) # [num_mentions]
mention_emb = tf.gather(
candidate_mention_emb,
predicted_mention_indices) # [num_mentions, emb]
mention_scores = tf.gather(candidate_mention_scores,
predicted_mention_indices) # [num_mentions]
mention_start_emb = tf.gather(text_outputs,
mention_starts) # [num_mentions, emb]
mention_end_emb = tf.gather(text_outputs,
mention_ends) # [num_mentions, emb]
mention_speaker_ids = tf.gather(speaker_ids,
mention_starts) # [num_mentions]
max_antecedents = self.config["max_antecedents"]
antecedents, antecedent_labels, antecedents_len = coref_ops.antecedents(
mention_starts, mention_ends, gold_starts, gold_ends, cluster_ids,
max_antecedents
) # ([num_mentions, max_ant], [num_mentions, max_ant + 1], [num_mentions]
antecedents.set_shape([None, None])
antecedent_labels.set_shape([None, None])
antecedents_len.set_shape([None])
antecedent_scores = self.get_antecedent_scores(
mention_emb, mention_scores, antecedents, antecedents_len,
mention_starts, mention_ends, mention_speaker_ids, genre_emb,
k) # [num_mentions, max_ant + 1]
loss = self.softmax_loss(antecedent_scores,
antecedent_labels) # [num_mentions]
# loss = self.exp_loss_margin(antecedent_scores, antecedent_labels) # [num_mentions]
loss = tf.reduce_sum(loss) # []
return [
candidate_starts, candidate_ends, candidate_mention_scores,
mention_starts, mention_ends, antecedents, antecedent_scores
], loss
