def __init__(self, corpus_dir):
self.graph = tf.Graph()
with self.graph.as_default():
tokenized_data = TokenizedData(corpus_dir=corpus_dir)
self.hparams = tokenized_data.hparams
self.train_batch = tokenized_data.get_training_batch()
self.model = ModelCreator(training=True,
tokenized_data=tokenized_data,
batch_input=self.train_batch)
def __init__(self, session, corpus_dir, result_dir, result_file):
"""
Args:
session: The TensorFlow session.
corpus_dir: Name of the folder storing corpus files and vocab information.
knbase_dir: Name of the folder storing data files for the knowledge base.
result_dir: The folder containing the trained result files.
result_file: The file name of the trained model.
"""
self.session = session
# Prepare data and hyper parameters
print("# Prepare dataset placeholder and hyper parameters ...")
tokenized_data = TokenizedData(corpus_dir=corpus_dir, training=False)
# self.knowledge_base = KnowledgeBase()
# self.knowledge_base.load_knbase(knbase_dir)
self.session_data = SessionData()
self.hparams = tokenized_data.hparams
self.src_placeholder = tf.placeholder(shape=[None],
dtype=tf.string,
name="src")
self.cont_placeholder = tf.placeholder(shape=[None],
dtype=tf.string,
name="context")
src_dataset = tf.data.Dataset.from_tensor_slices(
(self.src_placeholder, self.cont_placeholder))
# cont_dataset = tf.data.Dataset.from_tensor_slices(self.cont_placeholder)
self.infer_batch = tokenized_data.get_inference_batch(src_dataset)
# Create model
print("# Creating inference model ...")
self.model = ModelCreator(training=False,
tokenized_data=tokenized_data,
batch_input=self.infer_batch)
# Restore model weights
print("# Restoring model weights ...")
self.model.saver.restore(session, os.path.join(result_dir,
result_file))
self.session.run(tf.tables_initializer())
class BotTrainer(object):
def __init__(self, corpus_dir):
self.graph = tf.Graph()
with self.graph.as_default():
tokenized_data = TokenizedData(corpus_dir=corpus_dir)
self.hparams = tokenized_data.hparams
self.train_batch = tokenized_data.get_training_batch()
self.model = ModelCreator(training=True,
tokenized_data=tokenized_data,
batch_input=self.train_batch)
def train(self, result_dir, target=""):
"""Train a seq2seq model."""
# Summary writer
summary_name = "train_log"
summary_writer = tf.summary.FileWriter(
os.path.join(result_dir, summary_name), self.graph)
log_device_placement = self.hparams.log_device_placement
num_epochs = self.hparams.num_epochs
config_proto = tf.ConfigProto(
log_device_placement=log_device_placement,
allow_soft_placement=True)
config_proto.gpu_options.allow_growth = True
with tf.Session(target=target, config=config_proto,
graph=self.graph) as sess:
sess.run(tf.global_variables_initializer())
sess.run(tf.tables_initializer())
global_step = self.model.global_step.eval(session=sess)
# Initialize all of the iterators
sess.run(self.train_batch.initializer)
# Initialize the statistic variables
ckpt_loss, ckpt_predict_count = 0.0, 0.0
train_perp, last_record_perp = 2000.0, 2.0
train_epoch = 0
print("# Training loop started @ {}".format(
time.strftime("%Y-%m-%d %H:%M:%S")))
epoch_start_time = time.time()
while train_epoch < num_epochs:
# Each run of this while loop is a training step, multiple time/steps will trigger
# the train_epoch to be increased.
learning_rate = self._get_learning_rate(train_perp)
print("epochs ", train_epoch)
try:
step_result = self.model.train_step(
sess, learning_rate=learning_rate)
(_, step_loss, step_predict_count, step_summary,
global_step, step_word_count, batch_size) = step_result
# Write step summary.
summary_writer.add_summary(step_summary, global_step)
# update statistics
ckpt_loss += (step_loss * batch_size)
ckpt_predict_count += step_predict_count
except tf.errors.OutOfRangeError:
# Finished going through the training dataset. Go to next epoch.
train_epoch += 1
mean_loss = ckpt_loss / ckpt_predict_count
train_perp = math.exp(
float(mean_loss)) if mean_loss < 300 else math.inf
epoch_dur = time.time() - epoch_start_time
print(
"# Finished epoch {:2d} @ step {:5d} @ {}. In the epoch, learning rate = {:.6f}, "
"mean loss = {:.4f}, perplexity = {:8.4f}, and {:.2f} seconds elapsed."
.format(train_epoch, global_step,
time.strftime("%Y-%m-%d %H:%M:%S"),
learning_rate, mean_loss, train_perp,
round(epoch_dur, 2)))
epoch_start_time = time.time(
) # The start time of the next epoch
summary = tf.Summary(value=[
tf.Summary.Value(tag="train_perp",
simple_value=train_perp)
])
summary_writer.add_summary(summary, global_step)
# Save checkpoint
if train_perp < 1.6 and train_perp < last_record_perp:
self.model.saver.save(sess,
os.path.join(
result_dir, "basic"),
global_step=global_step)
last_record_perp = train_perp
ckpt_loss, ckpt_predict_count = 0.0, 0.0
sess.run(self.model.batch_input.initializer)
continue
# Done training
self.model.saver.save(sess,
os.path.join(result_dir, "basic"),
global_step=global_step)
summary_writer.close()
@staticmethod
def _get_learning_rate(perplexity):
if perplexity <= 1.48:
return 9.6e-5
elif perplexity <= 1.64:
return 1e-4
elif perplexity <= 2.0:
return 1.2e-4
elif perplexity <= 2.4:
return 1.6e-4
elif perplexity <= 3.2:
return 2e-4
elif perplexity <= 4.8:
return 2.4e-4
elif perplexity <= 8.0:
return 3.2e-4
elif perplexity <= 16.0:
return 4e-4
elif perplexity <= 32.0:
return 6e-4
else:
return 8e-4
class BotPredictor(object):
def __init__(self, session, corpus_dir, knbase_dir, result_dir,
result_file):
"""
Args:
session: The TensorFlow session.
corpus_dir: Name of the folder storing corpus files and vocab information.
knbase_dir: Name of the folder storing data files for the knowledge base.
result_dir: The folder containing the trained result files.
result_file: The file name of the trained model.
"""
self.session = session
# Prepare data and hyper parameters
print("# Prepare dataset placeholder and hyper parameters ...")
tokenized_data = TokenizedData(corpus_dir=corpus_dir, training=False)
self.knowledge_base = KnowledgeBase()
self.knowledge_base.load_knbase(knbase_dir)
self.session_data = SessionData()
self.hparams = tokenized_data.hparams
self.src_placeholder = tf.placeholder(shape=[None], dtype=tf.string)
src_dataset = tf.data.Dataset.from_tensor_slices(self.src_placeholder)
self.infer_batch = tokenized_data.get_inference_batch(src_dataset)
# Create model
print("# Creating inference model ...")
self.model = ModelCreator(training=False,
tokenized_data=tokenized_data,
batch_input=self.infer_batch)
# Restore model weights
print("# Restoring model weights ...")
self.model.saver.restore(session, os.path.join(result_dir,
result_file))
self.session.run(tf.tables_initializer())
def predict(self, session_id, question, html_format=False):
chat_session = self.session_data.get_session(session_id)
chat_session.before_prediction() # Reset before each prediction
if question.strip() == '':
answer = "Don't you want to say something to me?"
chat_session.after_prediction(question, answer)
return answer
pat_matched, new_sentence, para_list = check_patterns_and_replace(
question)
for pre_time in range(2):
tokens = nltk.word_tokenize(new_sentence.lower())
tmp_sentence = [' '.join(tokens[:]).strip()]
self.session.run(self.infer_batch.initializer,
feed_dict={self.src_placeholder: tmp_sentence})
outputs, _ = self.model.infer(self.session)
if self.hparams.beam_width > 0:
outputs = outputs[0]
eos_token = self.hparams.eos_token.encode("utf-8")
outputs = outputs.tolist()[0]
if eos_token in outputs:
outputs = outputs[:outputs.index(eos_token)]
if pat_matched and pre_time == 0:
out_sentence, if_func_val = self._get_final_output(
outputs,
chat_session,
para_list=para_list,
html_format=html_format)
if if_func_val:
chat_session.after_prediction(question, out_sentence)
return out_sentence
else:
new_sentence = question
else:
out_sentence, _ = self._get_final_output(
outputs, chat_session, html_format=html_format)
chat_session.after_prediction(question, out_sentence)
return out_sentence
def _get_final_output(self,
sentence,
chat_session,
para_list=None,
html_format=False):
sentence = b' '.join(sentence).decode('utf-8')
if sentence == '':
return "I don't know what to say.", False
if_func_val = False
last_word = None
word_list = []
for word in sentence.split(' '):
word = word.strip()
if not word:
continue
if word.startswith('_func_val_'):
if_func_val = True
word = call_function(word[10:],
knowledge_base=self.knowledge_base,
chat_session=chat_session,
para_list=para_list,
html_format=html_format)
if word is None or word == '':
continue
else:
if word in self.knowledge_base.upper_words:
word = self.knowledge_base.upper_words[word]
if (last_word is None or last_word
in ['.', '!', '?']) and not word[0].isupper():
word = word.capitalize()
if not word.startswith('\'') and word != 'n\'t' \
and (word[0] not in string.punctuation or word in ['(', '[', '{', '``', '$']) \
and last_word not in ['(', '[', '{', '``', '$']:
word = ' ' + word
word_list.append(word)
last_word = word
return ''.join(word_list).strip(), if_func_val
def Modelo(self):
self.modelo = ModelCreator()
self.root.destroy()