Repo for EMNLP 2021 paper: Matching-oriented Product Quantization For Ad-hoc Retrieval.

In this work, we identify the limitation of using reconstruction loss minimization in supervised PQ methods, and propose MCL as the new training objective, where the model can be learned to maximize the query-key matching probability to achieve the optimal retrieval accuracy. We further leverage DCS for contrastive sample argumentation, which ensures the effective minimization of MCL.

• Jointly optimize the codebook and embeddings
  Here are the command to for tokenization:

python preprocess.py --dataset Mind  --bert_model bert-base-uncased

This command will create two files: ./data/MIND/preprocessed_train.tsv and ./data/MIND/preprocessed_valid.tsv, where each line is the tokenization results of query and key:

{"query_tokens":List[int], "key_tokens":List[int]}
{"query_tokens":List[int], "key_tokens":List[int]}
...

• Optimize the codebooks based on the fixed embeddings
  If you want to trian the MoPQ based on the existing embeddings, you should generate the preprocessed files in the following format:

{"query_vec":List[float], "key_vec":List[float]}
{"query_vec":List[float], "key_vec":List[float]}
...

You also can storage the "query_vec" and "key_tokens" in the preprocessed files to only fix queries' embeddings. Besides, you need to provide the embeddings of queries/keys for testdata, i.e., test_queries.json/test_keys.json

{"id":List[float], ...}

You can download the Mind_with_emb dataset from here.

Use the following command to train MoPQ. And it will automatically select the best model to test.

python run.py \
  --mode train \
  --dataset {dataset: Mind or Mind_with_emb} \
  --bert_model bert-base-uncased \
  --model_type MoPQ \
  --savename MoPQ_Mind \
  --cross_device True \
  --world_size {the number of your GPUs}

If use more than one GPU, --cross_device should be True to activate the Differentiable Cross-device in-batch Sampling.
You can change the model_type to TextEncoder to train the encoder without PQ module:

python run.py \
  --mode train \
  --dataset Mind \
  --bert_model bert-base-uncased \
  --model_type TextEncoder \
  --savename MoPQ_Mind \
  --cross_device True \
  --world_size {the number of your GPUs}

You can also start the test process manually using following command:

python run.py \
  --mode test \
  --dataset {dataset: Mind or Mind_with_emb} \
  --model_type MoPQ \
  --load_ckpt_name ./model/MoPQ_Mind-best.pt 

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