ConvDR

This repo contains code and data for SIGIR 2021 paper "Few-Shot Conversational Dense Retrieval".

Prerequisites

Install dependencies:

git clone https://github.com/thunlp/ConvDR.git
cd ConvDR
pip install -r requirements.txt

We recommend set PYTHONPATH before running the code:

export PYTHONPATH=${PYTHONPATH}:`pwd`

To train ConvDR, we need trained ad hoc dense retrievers. We use ANCE for both tasks. Please downloads those checkpoints here: TREC CAsT and OR-QuAC. For TREC CAsT, we directly use the official model trained on MS MARCO Passage Retrieval task. For OR-QuAC, we initialize the retriever from the official model trained on NQ and TriviaQA, and continue training on OR-QuAC with manually reformulated questions using the ANCE codebase.

The following code downloads those checkpoints and store them in ./checkpoints.

mkdir checkpoints
wget https://webdatamltrainingdiag842.blob.core.windows.net/semistructstore/OpenSource/Passage_ANCE_FirstP_Checkpoint.zip
wget https://data.thunlp.org/convdr/ad-hoc-ance-orquac.cp
unzip Passage_ANCE_FirstP_Checkpoint.zip
mv "Passage ANCE(FirstP) Checkpoint" ad-hoc-ance-msmarco

Data Preparation

By default, we expect raw data to be stored in ./datasets/raw and processed data to be stored in ./datasets:

mkdir datasets
mkdir datasets/raw

TREC CAsT

CAsT shared files download

Use the following commands to download the document collection for CAsT-19 & CAsT-20 as well as the MARCO duplicate file:

cd datasets/raw
wget https://msmarco.blob.core.windows.net/msmarcoranking/collection.tar.gz -O msmarco.tsv
wget http://trec-car.cs.unh.edu/datareleases/v2.0/paragraphCorpus.v2.0.tar.xz
wget http://boston.lti.cs.cmu.edu/Services/treccast19/duplicate_list_v1.0.txt

CAsT-19 files download

Download necessary files for CAsT-19 and store them into ./datasets/raw/cast-19:

mkdir datasets/raw/cast-19
cd datasets/raw/cast-19
wget https://raw.githubusercontent.com/daltonj/treccastweb/master/2019/data/evaluation/evaluation_topics_v1.0.json
wget https://raw.githubusercontent.com/daltonj/treccastweb/master/2019/data/evaluation/evaluation_topics_annotated_resolved_v1.0.tsv
wget https://trec.nist.gov/data/cast/2019qrels.txt

CAsT-20 files download

Download necessary files for CAsT-20 and store them into ./datasets/raw/cast-20:

mkdir datasets/raw/cast-20
cd datasets/raw/cast-20
wget https://raw.githubusercontent.com/daltonj/treccastweb/master/2020/2020_automatic_evaluation_topics_v1.0.json
wget https://raw.githubusercontent.com/daltonj/treccastweb/master/2020/2020_manual_evaluation_topics_v1.0.json
wget https://trec.nist.gov/data/cast/2020qrels.txt

CAsT preprocessing

Use the scripts ./data/preprocess_cast19 and ./data/preprocess_cast20 to preprocess raw CAsT files:

mkdir datasets/cast-19
mkdir datasets/cast-shared
python data/preprocess_cast19.py  --car_cbor=datasets/raw/dedup.articles-paragraphs.cbor  --msmarco_collection=datasets/raw/msmarco.tsv  --duplicate_file=datasets/raw/duplicate_list_v1.0.txt  --cast_dir=datasets/raw/cast-19/  --out_data_dir=datasets/cast-19  --out_collection_dir=datasets/cast-shared

mkdir datasets/cast-20
mkdir datasets/cast-shared
python data/preprocess_cast20.py  --car_cbor=datasets/raw/dedup.articles-paragraphs.cbor  --msmarco_collection=datasets/raw/msmarco.tsv  --duplicate_file=datasets/raw/duplicate_list_v1.0.txt  --cast_dir=datasets/raw/cast-20/  --out_data_dir=datasets/cast-20  --out_collection_dir=datasets/cast-shared

OR-QuAC

OR-QuAC files download

Download necessary OR-QuAC files and store them into ./datasets/raw/or-quac:

mkdir datasets/raw/or-quac
cd datasets/raw/or-quac
wget https://ciir.cs.umass.edu/downloads/ORConvQA/all_blocks.txt.gz
wget https://ciir.cs.umass.edu/downloads/ORConvQA/qrels.txt.gz
gzip -d *.txt.gz
mkdir preprocessed
cd preprocessed
wget https://ciir.cs.umass.edu/downloads/ORConvQA/preprocessed/train.txt
wget https://ciir.cs.umass.edu/downloads/ORConvQA/preprocessed/test.txt
wget https://ciir.cs.umass.edu/downloads/ORConvQA/preprocessed/dev.txt

OR-QuAC preprocessing

Use the scripts ./data/preprocess_orquac to preprocess OR-QuAC files:

mkdir datasets/or-quac
python data/preprocess_orquac.py  --orquac_dir=datasets/raw/or-quac  --output_dir=datasets/or-quac

Generate Document Embeddings

Our code is based on ANCE and we have a similar embedding inference pipeline, where the documents are first tokenized and converted to token ids and then the token ids are used for embedding inference. We create sub-directories tokenized and embeddings inside ./datasets/cast-shared and ./datasets/or-quac to store the tokenized documents and document embeddings, respectively:

mkdir datasets/cast-shared/tokenized
mkdir datasets/cast-shared/embeddings
mkdir datasets/or-quac/tokenized
mkdir datasets/or-quac/embeddings

Run ./data/tokenizing.py to tokenize documents in parallel:

# CAsT
python data/tokenizing.py  --collection=datasets/cast-shared/collection.tsv  --out_data_dir=datasets/cast-shared/tokenized  --model_name_or_path=checkpoints/ad-hoc-ance-msmarco --model_type=rdot_nll
# OR-QuAC
python data/tokenizing.py  --collection=datasets/or-quac/collection.tsv  --out_data_dir=datasets/or-quac/tokenized  --model_name_or_path=bert-base-uncased --model_type=dpr

After tokenization, run ./drivers/gen_passage_embeddings.py to generate document embeddings:

# CAsT
python -m torch.distributed.launch --nproc_per_node=$gpu_no python drivers/gen_passage_embeddings.py  --data_dir=datasets/cast-shared/tokenized  --checkpoint=checkpoints/ad-hoc-ance-msmarco  --output_dir=datasets/cast-shared/embeddings  --model_type=rdot_nll
# OR-QuAC
python -m torch.distributed.launch --nproc_per_node=$gpu_no python drivers/gen_passage_embeddings.py  --data_dir=datasets/or-quac/tokenized  --checkpoint=checkpoints/ad-hoc-ance-orquac.cp  --output_dir=datasets/or-quac/embeddings  --model_type=dpr

Note that we follow the ANCE implementation and this step takes up a lot of memory. To generate all 38M CAsT document embeddings safely, the machine should have at least 200GB memory. It's possible to save memory by generating a part at a time, and we may update the implementation in the future.

ConvDR Training

Now we are all prepared: we have downloaded & preprocessed data, and we have obtained document embeddings. Simply run ./drivers/run_convdr_train.py to train a ConvDR using KD (MSE) loss:

# CAsT-19, KD loss only, five-fold cross-validation
python drivers/run_convdr_train.py  --output_dir=checkpoints/convdr-kd-cast19  --model_name_or_path=checkpoints/ad-hoc-ance-msmarco  --train_file=datasets/cast-19/eval_topics.jsonl  --query=no_res  --per_gpu_train_batch_size=4  --learning_rate=1e-5   --log_dir=logs/convdr_kd_cast19  --num_train_epochs=8  --model_type=rdot_nll  --cross_validate
# CAsT-20, KD loss only, five-fold cross-validation, use automatic canonical responses, set a longer length
python drivers/run_convdr_train.py  --output_dir=checkpoints/convdr-kd-cast20  --model_name_or_path=checkpoints/ad-hoc-ance-msmarco  --train_file=datasets/cast-20/eval_topics.jsonl  --query=auto_can  --per_gpu_train_batch_size=4  --learning_rate=1e-5   --log_dir=logs/convdr_kd_cast20  --num_train_epochs=8  --model_type=rdot_nll  --cross_validate  --max_concat_length=512
# OR-QuAC, KD loss only
python drivers/run_convdr_train.py  --output_dir=checkpoints/convdr-kd-orquac.cp  --model_name_or_path=checkpoints/ad-hoc-ance-orquac.cp  --train_file=datasets/or-quac/train.jsonl  --query=no_res  --per_gpu_train_batch_size=4  --learning_rate=1e-5  --log_dir=logs/convdr_kd_orquac  --num_train_epochs=1  --model_type=dpr  --log_steps=100

Note that for CAsT-20, it's better to first pretrain the model on CANARD and then do cross-validation:

# Pretrain on CANARD (use preprocessed OR-QuAC)
python drivers/run_convdr_train.py  --output_dir=checkpoints/convdr-kd-cast20-warmup  --model_name_or_path=checkpoints/ad-hoc-ance-msmarco  --train_file=datasets/or-quac/train.jsonl  --query=man_can  --per_gpu_train_batch_size=4  --learning_rate=1e-5   --log_dir=logs/convdr_kd_cast20_warmup  --num_train_epochs=1  --model_type=rdot_nll  --log_steps=100  --max_concat_length=512
# Do cross-validation on CAsT-20; Set model_name_or_path to the pretrained model and specify teacher_model to the ad hoc model
python drivers/run_convdr_train.py  --output_dir=checkpoints/convdr-kd-cast20  --model_name_or_path=checkpoints/convdr-kd-cast20-warmup  --teacher_model=checkpoints/ad-hoc-ance-msmarco  --train_file=datasets/cast-20/eval_topics.jsonl  --query=auto_can  --per_gpu_train_batch_size=4  --learning_rate=1e-5   --log_dir=logs/convdr_kd_cast20  --num_train_epochs=8  --model_type=rdot_nll  --cross_validate  --max_concat_length=512

To use ranking loss, we need to find negative documents for each query. We use top retrieved negatives documents from the ranking results of manual queries. So we need to first perform retrieval using the manual queries:

# CAsT-19
python drivers/run_convdr_inference.py  --model_path=checkpoints/ad-hoc-ance-msmarco  --eval_file=datasets/cast-19/eval_topics.jsonl  --query=target  --per_gpu_eval_batch_size=8  --ann_data_dir=datasets/cast-19/embeddings  --qrels=datasets/cast-19/qrels.tsv  --processed_data_dir=datasets/cast-19/tokenized  --raw_data_dir=datasets/cast-19   --output_file=results/cast-19/manual_ance.jsonl  --output_trec_file=results/cast-19/manual_ance.trec  --model_type=rdot_nll  --output_query_type=manual  --use_gpu
# OR-QuAC, inference on train, set query to "t