An Open-Source Package for Information Retrieval.

• Top Spot on TREC-COVID Challenge (May 2020, Round2)

  The twin goals of the challenge are to evaluate search algorithms and systems for helping scientists, clinicians, policy makers, and others manage the existing and rapidly growing corpus of scientific literature related to COVID-19, and to discover methods that will assist with managing scientific information in future global biomedical crises.
  >> Reproduce Our Submit >> About COVID-19 Dataset >> Our Paper

OpenMatch integrates excellent neural methods and technologies to provide a complete solution for deep text matching and understanding. The documentation and tutorial of OpenMatch are available at here.

1/ Document Retrieval

Document Retrieval refers to extracting a set of related documents from large-scale document-level data based on user queries.

Sparse Retriever is defined as a sparse bag-of-words retrieval model.

Dense Retriever performs retrieval by encoding documents and queries into dense low-dimensional vectors, and selecting the document that has the highest inner product with the query

2/ Document Reranking

Document reranking aims to further match user query and documents retrieved by the previous step with the purpose of obtaining a ranked list of relevant documents.

Neural Ranker uses neural network as ranker to reorder documents.

Feature Ensemble can fuse neural features learned by neural ranker with the features of non-neural methods to obtain more robust performance

3/ Domain Transfer Learning

Domain Transfer Learning can leverages external knowledge graphs or weak supervision data to guide and help ranker to overcome data scarcity.

Knowledge Enhancement incorporates entity semantics of external knowledge graphs to enhance neural ranker.

Data Augmentation leverages weak supervision data to improve the ranking accuracy in certain areas that lacks large scale relevance labels.

Note that the BERT model is following huggingface's implementation - transformers, so other bert-like models are also available in our toolkit, e.g. electra, scibert.

pip install git+https://github.com/thunlp/OpenMatch.git

git clone https://github.com/thunlp/OpenMatch.git
cd OpenMatch
python setup.py install

To build an OpenMatch docker image from Dockerfile

docker build -t <image_name> .

To run your docker image just built above as a container

docker run --gpus all --name=<container_name> -it -v /:/all/ --rm <image_name>:<TAG>

* Detailed examples are available here.

import torch
import OpenMatch as om

query = "Classification treatment COVID-19"
doc = "By retrospectively tracking the dynamic changes of LYM% in death cases and cured cases, this study suggests that lymphocyte count is an effective and reliable indicator for disease classification and prognosis in COVID-19 patients."

* For bert-like models:

from transformers import AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("allenai/scibert_scivocab_uncased")
input_ids = tokenizer.encode(query, doc)
model = om.models.Bert("allenai/scibert_scivocab_uncased")
ranking_score, ranking_features = model(torch.tensor(input_ids).unsqueeze(0))

* For other models:

tokenizer = om.data.tokenizers.WordTokenizer(pretrained="./data/glove.6B.300d.txt")
query_ids, query_masks = tokenizer.process(query, max_len=16)
doc_ids, doc_masks = tokenizer.process(doc, max_len=128)
model = om.models.KNRM(vocab_size=tokenizer.get_vocab_size(),
                       embed_dim=tokenizer.get_embed_dim(),
                       embed_matrix=tokenizer.get_embed_matrix())
ranking_score, ranking_features = model(torch.tensor(query_ids).unsqueeze(0),
                                        torch.tensor(query_masks).unsqueeze(0),
                                        torch.tensor(doc_ids).unsqueeze(0),
                                        torch.tensor(doc_masks).unsqueeze(0))

* The GloVe can be downloaded using:

wget http://nlp.stanford.edu/data/glove.6B.zip -P ./data
unzip ./data/glove.6B.zip -d ./data

* Evaluation

metric = om.Metric()
res = metric.get_metric(qrels, ranking_list, 'ndcg_cut_20')
res = metric.get_mrr(qrels, ranking_list, 'mrr_cut_10')

* Ad-hoc Search

* MS MARCO Passage Ranking

* MS MARCO Document Ranking

* Classic Features

Thanks to all the people who contributed to OpenMatch!

Kaitao Zhang, Si Sun, Zhenghao Liu, Aowei Lu

• Zhiyuan Liu
  • Tsinghua University
  • Homepage
• Chenyan Xiong
  • Microsoft Research AI
  • Homepage
• Maosong Sun
  • Tsinghua University
  • Homepage