Explore extreme compression for pre-trained language models

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Deep LearningXcompression
Overview

Explore extreme compression for pre-trained language models

Code for paper "Exploring extreme parameter compression for pre-trained language models ICLR2022"

Before Training

install some libraries

 pip install tensorly==0.5.0

Torch is needed, torch 1.0-1.4 is preferred

Install horovod for distributed learning

Configuration Install horovod on GPU

pip install horovod[pytorch]

loading pre-trained models

wget https://huggingface.co/bert-base-uncased/resolve/main/pytorch_model.bin -P  models/bert-base-uncased
wget https://huggingface.co/bert-base-uncased/resolve/main/vocab.txt -P  models/bert-base-uncased
cp models/bert-base-uncased/pytorch_model.bin models/bert-td-72-384/pytorch_model.bin 
cp models/bert-base-uncased/vocab.txt models/bert-td-72-384/vocab.txt

generate training data for given corpora (e.g., saved in the path "corpora" )

python pregenerate_training_data.py --train_corpus ${CORPUS_RAW} \ 
                  --bert_model ${BERT_BASE_DIR}$ \
                  --reduce_memory --do_lower_case \
                  --epochs_to_generate 3 \
                  --output_dir ${CORPUS_JSON_DIR}$

task data augmentation

python data_augmentation.py --pretrained_bert_model ${BERT_BASE_DIR}$ \
                            --glove_embs ${GLOVE_EMB}$ \
                            --glue_dir ${GLUE_DIR}$ \  
                            --task_name ${TASK_NAME}$

Decomposing BERT

decomposition and general distillation

Run with horovod

mpirun -np 8 -bind-to none -map-by slot -x NCCL_DEBUG=INFO -x LD_LIBRARY_PATH -x PATH -mca pml ob1 -mca btl ^openib python3 general_distill.py --teacher_model models/bert-base-uncased --student_model models/bert-gd-72-384 --pregenerated_data data/pregenerated_data --num_train_epochs 2.0 --train_batch_size 32 --output_dir output/bert-gd-72-384 -use_swap --do_lower_case

To restrict sharing among SAN or FFN, add "ops" and set "ops" to be "san" or "ffn" in bert-gd-72-384/config.json

ops = "san"

Evaluation

Task distillation with data augmentation in fine-tuning phase

Rename a pretrained model as "", for instance, change step_0_pytorch_model.bin to pytorch_model.bin, and change load_compressed_model from false to true in output/config.json

Task distillation for distributed training

CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7 python -m torch.distributed.launch --nproc_per_node=8 task_distill.py --teacher_model models/bert-base-uncasedi/STS-B --student_model models/bert-gd-72-384 --task_name STS-B --aug_train --data_dir data/glue_data/SST-2 --max_seq_length 128 --train_batch_size 32 --aug_train --learning_rate 2e-5 --num_train_epochs 3.0 --output_dir ./output/36-256-STS-B

Task distillation for single gpu

python3  task_distill.py  --teacher_model models/bert-base-uncased   --student_model  models/bert-td-72-384  --output output_demo  --data_dir  data/glue_data/SST-2   --task_name  SST-2  --do_lower_case --aug_train

For augmentation, you should add --aug_train

Get test result for model

python run_glue.py --model_name_or_path  models/bert-td-72-384/SST-2 --task_name SST-2 --do_eval --do_predict --data_dir data/glue_data/STS-B --max_seq_length 128 --save_steps 500 --save_total_limit 2 --output_dir ./output/SST-2
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