Scalable implementation of dense retrieval.

This repo implements the following papers:

• Domain-matched Pre-training Tasks for Dense Retrieval
• Salient Phrase Aware Dense Retrieval: Can a Dense Retriever Imitate a Sparse One?
  • https://github.com/facebookresearch/dpr-scale/tree/main/spar
• CITADEL: Conditional Token Interaction via Dynamic Lexical Routing for Efficient and Effective Multi-Vector Retrieval
  • https://github.com/facebookresearch/dpr-scale/tree/citadel
• How to Train Your DRAGON: Diverse Augmentation Towards Generalizable Dense Retrieval
  • https://github.com/facebookresearch/dpr-scale/tree/main/dragon

Input Data Format (JSONL)

Linewise JSON file where each row typically looks like:

{
    "question": ...,
    "positive_ctxs": [
        {
        "title": "...",
        "text": "....",
        <optional>
        "id": ...,
        "relevance": ...
        }, {...}, ...
    ],
    "hard_negative_ctxs": [{...}, {...}, ...]
}

or

{
    "question": ...,
    "id": ...,
    "ctxs": [
        {
        "has_answer": True or False,    
        "title": "...",
        "text": "....",
        <optional>
        "id": ...,
        "relevance": ...
        }, {...}, ...
    ]
}

If your training data is large, you can use a lightweight format by specifying the line number (docidx starting from 0) of the document in the corpus without storing its title and text:

{
    "question": ...,
    "positive_ctxs": [
        {
        "docidx": ..., # denote the position of the passage in the corpus, starting from 0
        <optional>
        "id": ...,
        "relevance": ...
        }, {...}, ...
    ],
    "hard_negative_ctxs": [{...}, {...}, ...]
}

This format requires you to use DenseRetrieverMultiJsonlDataModule and set --corpus_path while training. See below example with config msmarco_baseline.yaml. The corpus format follow the default Wiki corpus format with header at first line:

id"\t"text"\t"title
<id>"\t"<text>"\t"<title>
...

Training on cluster

By default it trains locally:

PYTHONPATH=.:$PYTHONPATH python dpr_scale/main.py trainer.gpus=1

You can try our example of baseline training locally on MS MARCO dataset with the lightweight data format:

PYTHONPATH=.:$PYTHONPATH python dpr_scale/main.py -m --config-name msmarco_baseline.yaml 

SLURM Training

To train the model on SLURM, run:

PYTHONPATH=.:$PYTHONPATH python dpr_scale/main.py -m trainer=slurm trainer.num_nodes=2 trainer.gpus=2

Reproduce DPR on 8 gpus

PYTHONPATH=.:$PYTHONPATH python dpr_scale/main.py -m --config-name nq.yaml  +hydra.launcher.name=dpr_stl_nq_reproduce

Generate embeddings on Wikipedia

PYTHONPATH=.:$PYTHONPATH python dpr_scale/generate_embeddings.py -m --config-name nq.yaml datamodule=generate datamodule.test_path=psgs_w100.tsv +task.ctx_embeddings_dir=<CTX_EMBEDDINGS_DIR> +task.checkpoint_path=<CHECKPOINT_PATH>

Get retrieval results

Currently this runs on 1 GPU. Use CTX_EMBEDDINGS_DIR from above.

PYTHONPATH=.:$PYTHONPATH python dpr_scale/run_retrieval.py --config-name nq.yaml trainer=gpu_1_host trainer.gpus=1 +task.output_path=<PATH_TO_OUTPUT_JSON> +task.ctx_embeddings_dir=<CTX_EMBEDDINGS_DIR> +task.checkpoint_path=<CHECKPOINT_PATH> +task.passages=psgs_w100.tsv datamodule.test_path=<PATH_TO_QUERIES_JSONL>

Generate query embeddings

Alternatively, query embedding generation and retrieval can be separated. After query embeddings are generated using the following command, the run_retrieval_fb.py or run_retrieval_multiset.py script can be used to perform retrieval.

PYTHONPATH=.:$PYTHONPATH python dpr_scale/generate_query_embeddings.py -m --config-name nq.yaml trainer.gpus=1 datamodule.test_path=<PATH_TO_QUERIES_JSONL> +task.ctx_embeddings_dir=<CTX_EMBEDDINGS_DIR> +task.checkpoint_path=<CHECKPOINT_PATH> +task.query_emb_output_path=<OUTPUT_TO_QUERY_EMB>

Get evaluation metrics for a given JSON output file

python dpr_scale/eval_dpr.py --retrieval <PATH_TO_OUTPUT_JSON> --topk 1 5 10 20 50 100 

Get evaluation metrics for MSMARCO

python dpr_scale/msmarco_eval.py ~data/msmarco/qrels.dev.small.tsv PATH_TO_OUTPUT_JSON

Domain-matched Pre-training Tasks for Dense Retrieval

Paper: https://arxiv.org/abs/2107.13602

The sections below provide links to datasets and pretrained models, as well as, instructions to prepare datasets, pretrain and fine-tune them.

Q&A Datasets

PAQ

Download the dataset from here

Conversational Datasets

You can download the dataset from the respective tables.

Reddit

File	Download Link
train	download
dev	download

ConvAI2

File	Download Link
train	download
dev	download

DSTC7

File	Download Link
train	download
dev	download
test	download

Prepare by downloading the tar ball linked here, and using the command below.

DSTC7_DATA_ROOT=<path_of_dir_where_the_data_is_extracted>
python dpr_scale/data_prep/prep_conv_datasets.py \
    --dataset dstc7 \
    --in_file_path $DSTC7_DATA_ROOT/ubuntu_train_subtask_1_augmented.json \
    --out_file_path $DSTC7_DATA_ROOT/ubuntu_train.jsonl

Ubuntu V2

File	Download Link
train	download
dev	download
test	download

Prepare by downloading the tar ball linked here, and using the command below.

UBUNTUV2_DATA_ROOT=<path_of_dir_where_the_data_is_extracted>
python dpr_scale/data_prep/prep_conv_datasets.py \
    --dataset ubuntu2 \
    --in_file_path $UBUNTUV2_DATA_ROOT/train.csv \
    --out_file_path $UBUNTUV2_DATA_ROOT/train.jsonl

Pretraining DPR

Pretrained Checkpoints

Pretrained Model	Dataset	Download Link
BERT-base	PAQ	download
BERT-large	PAQ	download
BERT-base	Reddit	download
BERT-large	Reddit	download
RoBERTa-base	Reddit	download
RoBERTa-large	Reddit	download

Pretraining on PAQ dataset

DPR_ROOT=<path_of_your_repo's_root>
MODEL="bert-large-uncased"
NODES=8
BSZ=16
MAX_EPOCHS=20
LR=1e-5
TIMOUT_MINS=4320
EXP_DIR=<path_of_the_experiment_dir>
TRAIN_PATH=<path_of_the_training_data_file>
mkdir -p ${EXP_DIR}/logs
PYTHONPATH=$DPR_ROOT python ${DPR_ROOT}/dpr_scale/main.py -m \
    --config-dir ${DPR_ROOT}/dpr_scale/conf \
    --config-name nq.yaml \
    hydra.launcher.timeout_min=$TIMOUT_MINS \
    hydra.sweep.dir=${EXP_DIR} \
    trainer.num_nodes=${NODES} \
    task.optim.lr=${LR} \
    task.model.model_path=${MODEL} \
    trainer.max_epochs=${MAX_EPOCHS} \
    datamodule.train_path=$TRAIN_PATH \
    datamodule.batch_size=${BSZ} \
    datamodule.num_negative=1 \
    datamodule.num_val_negative=10 \
    datamodule.num_test_negative=50 > ${EXP_DIR}/logs/log.out 2> ${EXP_DIR}/logs/log.err &

Pretraining on Reddit dataset

# Use a batch size of 16 for BERT and RoBERTa base models.
BSZ=4
NODES=8
MAX_EPOCHS=5
WARMUP_STEPS=10000
LR=1e-5
MODEL="roberta-large"
EXP_DIR=<path_of_the_experiment_dir>
PYTHONPATH=. python dpr_scale/main.py -m \
    --config-dir ${DPR_ROOT}/dpr_scale/conf \
    --config-name reddit.yaml \
    hydra.launcher.nodes=${NODES} \
    hydra.sweep.dir=${EXP_DIR} \
    trainer.num_nodes=${NODES} \
    task.optim.lr=${LR} \
    task.model.model_path=${MODEL} \
    trainer.max_epochs=${MAX_EPOCHS} \
    task.warmup_steps=${WARMUP_STEPS} \
    datamodule.batch_size=${BSZ} > ${EXP_DIR}/logs/log.out 2> ${EXP_DIR}/logs/log.err &

Fine-tuning DPR on downstream tasks/datasets

Fine-tune the pretrained PAQ checkpoint

# You can also try 2e-5 or 5e-5. Usually these 3 learning rates work best.
LR=1e-5
# Use a batch size of 32 for BERT and RoBERTa base models.
BSZ=12
MODEL="bert-large-uncased"
MAX_EPOCHS=40
WARMUP_STEPS=1000
NODES=1
PRETRAINED_CKPT_PATH=<path_of_checkpoint_pretrained_on_reddit>
EXP_DIR=<path_of_the_experiment_dir>
PYTHONPATH=. python dpr_scale/main.py -m \
    --config-dir ${DPR_ROOT}/dpr_scale/conf \
    --config-name nq.yaml \
    hydra.launcher.name=${NAME} \
    hydra.sweep.dir=${EXP_DIR} \
    trainer.num_nodes=${NODES} \
    trainer.max_epochs=${MAX_EPOCHS} \
    datamodule.num_negative=1 \
    datamodule.num_val_negative=25 \
    datamodule.num_test_negative=50 \
    +trainer.val_check_interval=150 \
    task.warmup_steps=${WARMUP_STEPS} \
    task.optim.lr=${LR} \
    task.pretrained_checkpoint_path=$PRETRAINED_CKPT_PATH \
    task.model.model_path=${MODEL} \
    datamodule.batch_size=${BSZ} > ${EXP_DIR}/logs/log.out 2> ${EXP_DIR}/logs/log.err &

Fine-tune the pretrained Reddit checkpoint

Batch sizes that worked on Volta 32GB GPUs for respective model and datasets.

Model	Dataset	Batch Size
BERT/RoBERTa base	ConvAI2	64
RBERT/RoBERTa base	ConvAI2	16
BERT/RoBERTa base	DSTC7	24
BERT/RoBERTa base	DSTC7	8
BERT/RoBERTa base	Ubuntu V2	64
BERT/RoBERTa large	Ubuntu V2	16

# Change the config file name to convai2.yaml or dstc7.yaml for the respective datasets.
CONFIG_FILE_NAME=ubuntuv2.yaml
# You can also try 2e-5 or 5e-5. Usually these 3 learning rates work best.
LR=1e-5
BSZ=16
NODES=1
MAX_EPOCHS=5
WARMUP_STEPS=10000
MODEL="roberta-large"
PRETRAINED_CKPT_PATH=<path_of_checkpoint_pretrained_on_reddit>
EXP_DIR=<path_of_the_experiment_dir>
PYTHONPATH=${DPR_ROOT} python ${DPR_ROOT}/dpr_scale/main.py -m \
    --config-dir=${DPR_ROOT}/dpr_scale/conf \
    --config-name=$CONFIG_FILE_NAME \
    hydra.launcher.nodes=${NODES} \
    hydra.sweep.dir=${EXP_DIR} \
    trainer.num_nodes=${NODES} \
    trainer.max_epochs=${MAX_EPOCHS} \
    +trainer.val_check_interval=150 \
    task.pretrained_checkpoint_path=$PRETRAINED_CKPT_PATH \
    task.warmup_steps=${WARMUP_STEPS} \
    task.optim.lr=${LR} \
    task.model.model_path=$MODEL \
    datamodule.batch_size=${BSZ} > ${EXP_DIR}/logs/log.out 2> ${EXP_DIR}/logs/log.err &

License

dpr-scale is CC-BY-NC 4.0 licensed as of now.