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"""
This example runs a CNN after the word embedding lookup. The output of the CNN is than pooled,
for example with mean-pooling.
"""
import torch
from torch.utils.data import DataLoader
import math
from sentence_transformers import models, losses, util
from sentence_transformers import LoggingHandler, SentenceTransformer
from sentence_transformers.evaluation import EmbeddingSimilarityEvaluator
from sentence_transformers.readers import *
import logging
from datetime import datetime
import os
import csv
import gzip
#### Just some code to print debug information to stdout
logging.basicConfig(format='%(asctime)s - %(message)s',
datefmt='%Y-%m-%d %H:%M:%S',
level=logging.INFO,
handlers=[LoggingHandler()])
#### /print debug information to stdout
# Read the dataset
batch_size = 32
model_save_path = 'output/training_stsbenchmark_cnn-'+datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
#Check if dataset exsist. If not, download and extract it
sts_dataset_path = 'datasets/stsbenchmark.tsv.gz'
if not os.path.exists(sts_dataset_path):
util.http_get('https://sbert.net/datasets/stsbenchmark.tsv.gz', sts_dataset_path)
logging.info("Read STSbenchmark train dataset")
train_samples = []
dev_samples = []
test_samples = []
with gzip.open(sts_dataset_path, 'rt', encoding='utf8') as fIn:
reader = csv.DictReader(fIn, delimiter='\t', quoting=csv.QUOTE_NONE)
for row in reader:
score = float(row['score']) / 5.0 # Normalize score to range 0 ... 1
inp_example = InputExample(texts=[row['sentence1'], row['sentence2']], label=score)
if row['split'] == 'dev':
dev_samples.append(inp_example)
elif row['split'] == 'test':
test_samples.append(inp_example)
else:
train_samples.append(inp_example)
# Map tokens to vectors using BERT
word_embedding_model = models.Transformer('bert-base-uncased')
cnn = models.CNN(in_word_embedding_dimension=word_embedding_model.get_word_embedding_dimension(), out_channels=256, kernel_sizes=[1,3,5])
# Apply mean pooling to get one fixed sized sentence vector
pooling_model = models.Pooling(cnn.get_word_embedding_dimension(),
pooling_mode_mean_tokens=True,
pooling_mode_cls_token=False,
pooling_mode_max_tokens=False)
model = SentenceTransformer(modules=[word_embedding_model, cnn, pooling_model])
# Convert the dataset to a DataLoader ready for training
logging.info("Read STSbenchmark train dataset")
train_dataloader = DataLoader(train_samples, shuffle=True, batch_size=batch_size)
train_loss = losses.CosineSimilarityLoss(model=model)
logging.info("Read STSbenchmark dev dataset")
evaluator = EmbeddingSimilarityEvaluator.from_input_examples(dev_samples, name='sts-dev')
# Configure the training
num_epochs = 10
warmup_steps = math.ceil(len(train_dataloader) * num_epochs * 0.1) #10% of train data for warm-up
logging.info("Warmup-steps: {}".format(warmup_steps))
# Train the model
model.fit(train_objectives=[(train_dataloader, train_loss)],
evaluator=evaluator,
epochs=num_epochs,
warmup_steps=warmup_steps,
output_path=model_save_path
)
##############################################################################
#
# Load the stored model and evaluate its performance on STS benchmark dataset
#
##############################################################################
model = SentenceTransformer(model_save_path)
test_evaluator = EmbeddingSimilarityEvaluator.from_input_examples(test_samples, name='sts-test')
model.evaluate(evaluator) |