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text_similarity

Text similarity using BERT sentence embeddings.

This repository is based on the Sentence Transformers, a repository fine-tunes BERT / RoBERTa / DistilBERT / ALBERT / XLNet with a siamese or triplet network structure to produce semantically meaningful sentence embeddings that can be used in unsupervised scenarios: Semantic textual similarity via cosine-similarity, clustering, semantic search. There are multiple different others sentence-BERT models.

Setup

We recommend Python 3.6 or higher. The model is implemented with PyTorch (at least 1.0.1) using transformers v2.3.0. The code does not work with Python 2.7.

With pip

Install the model with pip:

pip install -U sentence-transformers

Getting Started

Dataset

First, the sentence corpus should be downloaded and saved in the directory "data/sentence_corpus/". Please look at the format of the example file "data/sentence_corpus/input.tsv", each row of this tsv file is one sentence.

Model

Second, the model should be downloaded (sentence-BERT models) and saved in the directory "./model/". In this repository, we use the "roberta-base-nli-mean-tokens" as one example.

Generate sentence embeddings for every sentence in the corpus

Generate sentence embeddings and save them as pickle files.

python process_sentence_corpus.py -model model/roberta-base-nli-mean-tokens -model_type sentence_bert -sentences data/sentence_corpus/example.tsv -output data/output/

Search most similar sentences in the corpus for the query

Find the 5 most similar sentence for the query

python text_search.py -model model/roberta-base-nli-mean-tokens -model_type sentence_bert -embeddings data/output/ -query "I like eatting apples."

Customize the sentence-BERT models

Further train the sentence-BERT models on extra datasets. GPU resources are required.

Collect domain-specific dataset

Collec the extra dataset and save them into "data/extra_dataset/train.tsv" and "data/extra_dataset/train.tsv". Each row of the train.tsv file is one training example with the format of "$sentence1, $most_similar_sentence_for sentence1, $irrelevant_sentence_for_sentence1".

Hyper-parameters tunning

Currently, the default hyper-parameters are fixed and saved in "continue_training.conf"

Continue training the sentence-BERT model on domain-specific dataset

python continue_training_models.py -model model/roberta-base-nli-mean-tokens -extra_dataset data/extra_dataset