zhaoting
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| .. | ||
| scripts | ||
| src | ||
| README.md | ||
| __init__.py | ||
| run_general_distill.py | ||
| run_task_distill.py | ||
README.md
Contents
- Contents
- TinyBERT Description
- Model Architecture
- Dataset
- Environment Requirements
- Quick Start
- Script Description
- Description of Random Situation
- ModelZoo Homepage
TinyBERT Description
TinyBERT is 7.5x smalller and 9.4x faster on inference than BERT-base (the base version of BERT model) and achieves competitive performances in the tasks of natural language understanding. It performs a novel transformer distillation at both the pre-training and task-specific learning stages.
Paper: Xiaoqi Jiao, Yichun Yin, Lifeng Shang, Xin Jiang, Xiao Chen, Linlin Li, Fang Wang, Qun Liu. TinyBERT: Distilling BERT for Natural Language Understanding. arXiv preprint arXiv:1909.10351.
Model Architecture
The backbone structure of TinyBERT is transformer, the transformer contains four encoder modules, one encoder contains one selfattention module and one selfattention module contains one attention module.
Dataset
- Download the zhwiki or enwiki dataset for general distillation. Extract and clean text in the dataset with WikiExtractor. Convert the dataset to TFRecord format, please refer to create_pretraining_data.py which in BERT repository.
- Download glue dataset for task distillation. Convert dataset files from json format to tfrecord format, please refer to run_classifier.py which in BERT repository.
Environment Requirements
- Hardware（Ascend/GPU）
- Prepare hardware environment with Ascend or GPU processor. If you want to try Ascend, please send the application form to ascend@huawei.com. Once approved, you can get the resources.
- Framework
- For more information, please check the resources below：
Quick Start
After installing MindSpore via the official website, you can start general distill, task distill and evaluation as follows:
# run standalone general distill example
bash scripts/run_standalone_gd.sh
Before running the shell script, please set the `load_teacher_ckpt_path`, `data_dir`, `schema_dir` and `dataset_type` in the run_standalone_gd.sh file first. If running on GPU, please set the `device_target=GPU`.
# For Ascend device, run distributed general distill example
bash scripts/run_distributed_gd_ascend.sh 8 1 /path/hccl.json
Before running the shell script, please set the `load_teacher_ckpt_path`, `data_dir`, `schema_dir` and `dataset_type` in the run_distributed_gd_ascend.sh file first.
# For GPU device, run distributed general distill example
bash scripts/run_distributed_gd_gpu.sh 8 1 /path/data/ /path/schema.json /path/teacher.ckpt
# run task distill and evaluation example
bash scripts/run_standalone_td.sh
Before running the shell script, please set the `task_name`, `load_teacher_ckpt_path`, `load_gd_ckpt_path`, `train_data_dir`, `eval_data_dir`, `schema_dir` and `dataset_type` in the run_standalone_td.sh file first.
If running on GPU, please set the `device_target=GPU`.
For distributed training on Ascend, a hccl configuration file with JSON format needs to be created in advance. Please follow the instructions in the link below: https:gitee.com/mindspore/mindspore/tree/master/model_zoo/utils/hccl_tools.
For dataset, if you want to set the format and parameters, a schema configuration file with JSON format needs to be created, please refer to tfrecord format.
For general task, schema file contains ["input_ids", "input_mask", "segment_ids"].
For task distill and eval phase, schema file contains ["input_ids", "input_mask", "segment_ids", "label_ids"].
`numRows` is the only option which could be set by user, the others value must be set according to the dataset.
For example, the dataset is cn-wiki-128, the schema file for general distill phase as following:
{
"datasetType": "TF",
"numRows": 7680,
"columns": {
"input_ids": {
"type": "int64",
"rank": 1,
"shape": [256]
},
"input_mask": {
"type": "int64",
"rank": 1,
"shape": [256]
},
"segment_ids": {
"type": "int64",
"rank": 1,
"shape": [256]
}
}
}
Script Description
Script and Sample Code
.
└─bert
├─README.md
├─scripts
├─run_distributed_gd_ascend.sh # shell script for distributed general distill phase on Ascend
├─run_distributed_gd_gpu.sh # shell script for distributed general distill phase on GPU
├─run_standalone_gd.sh # shell script for standalone general distill phase
├─run_standalone_td.sh # shell script for standalone task distill phase
├─src
├─__init__.py
├─assessment_method.py # assessment method for evaluation
├─dataset.py # data processing
├─gd_config.py # parameter configuration for general distill phase
├─td_config.py # parameter configuration for task distill phase
├─tinybert_for_gd_td.py # backbone code of network
├─tinybert_model.py # backbone code of network
├─utils.py # util function
├─__init__.py
├─run_general_distill.py # train net for general distillation
├─run_task_distill.py # train and eval net for task distillation
Script Parameters
General Distill
usage: run_general_distill.py [--distribute DISTRIBUTE] [--epoch_size N] [----device_num N] [--device_id N]
[--device_target DEVICE_TARGET] [--do_shuffle DO_SHUFFLE]
[--enable_data_sink ENABLE_DATA_SINK] [--data_sink_steps N]
[--save_ckpt_path SAVE_CKPT_PATH]
[--load_teacher_ckpt_path LOAD_TEACHER_CKPT_PATH]
[--save_checkpoint_step N] [--max_ckpt_num N]
[--data_dir DATA_DIR] [--schema_dir SCHEMA_DIR] [--dataset_type DATASET_TYPE] [train_steps N]
options:
--device_target device where the code will be implemented: "Ascend" | "GPU", default is "Ascend"
--distribute pre_training by serveral devices: "true"(training by more than 1 device) | "false", default is "false"
--epoch_size epoch size: N, default is 1
--device_id device id: N, default is 0
--device_num number of used devices: N, default is 1
--save_ckpt_path path to save checkpoint files: PATH, default is ""
--max_ckpt_num max number for saving checkpoint files: N, default is 1
--do_shuffle enable shuffle: "true" | "false", default is "true"
--enable_data_sink enable data sink: "true" | "false", default is "true"
--data_sink_steps set data sink steps: N, default is 1
--save_checkpoint_step steps for saving checkpoint files: N, default is 1000
--load_teacher_ckpt_path path to load teacher checkpoint files: PATH, default is ""
--data_dir path to dataset directory: PATH, default is ""
--schema_dir path to schema.json file, PATH, default is ""
--dataset_type the dataset type which can be tfrecord/mindrecord, default is tfrecord
Task Distill
usage: run_general_task.py [--device_target DEVICE_TARGET] [--do_train DO_TRAIN] [--do_eval DO_EVAL]
[--td_phase1_epoch_size N] [--td_phase2_epoch_size N]
[--device_id N] [--do_shuffle DO_SHUFFLE]
[--enable_data_sink ENABLE_DATA_SINK] [--save_ckpt_step N]
[--max_ckpt_num N] [--data_sink_steps N]
[--load_teacher_ckpt_path LOAD_TEACHER_CKPT_PATH]
[--load_gd_ckpt_path LOAD_GD_CKPT_PATH]
[--load_td1_ckpt_path LOAD_TD1_CKPT_PATH]
[--train_data_dir TRAIN_DATA_DIR]
[--eval_data_dir EVAL_DATA_DIR]
[--task_name TASK_NAME] [--schema_dir SCHEMA_DIR] [--dataset_type DATASET_TYPE]
options:
--device_target device where the code will be implemented: "Ascend" | "GPU", default is "Ascend"
--do_train enable train task: "true" | "false", default is "true"
--do_eval enable eval task: "true" | "false", default is "true"
--td_phase1_epoch_size epoch size for td phase1: N, default is 10
--td_phase2_epoch_size epoch size for td phase2: N, default is 3
--device_id device id: N, default is 0
--do_shuffle enable shuffle: "true" | "false", default is "true"
--enable_data_sink enable data sink: "true" | "false", default is "true"
--save_ckpt_step steps for saving checkpoint files: N, default is 1000
--max_ckpt_num max number for saving checkpoint files: N, default is 1
--data_sink_steps set data sink steps: N, default is 1
--load_teacher_ckpt_path path to load teacher checkpoint files: PATH, default is ""
--load_gd_ckpt_path path to load checkpoint files which produced by general distill: PATH, default is ""
--load_td1_ckpt_path path to load checkpoint files which produced by task distill phase 1: PATH, default is ""
--train_data_dir path to train dataset directory: PATH, default is ""
--eval_data_dir path to eval dataset directory: PATH, default is ""
--task_name classification task: "SST-2" | "QNLI" | "MNLI", default is ""
--schema_dir path to schema.json file, PATH, default is ""
--dataset_type the dataset type which can be tfrecord/mindrecord, default is tfrecord
Options and Parameters
gd_config.py and td_config.py contain parameters of BERT model and options for optimizer and lossscale.
Options:
Parameters for lossscale:
loss_scale_value initial value of loss scale: N, default is 2^8
scale_factor factor used to update loss scale: N, default is 2
scale_window steps for once updatation of loss scale: N, default is 50
Parameters for optimizer:
learning_rate value of learning rate: Q
end_learning_rate value of end learning rate: Q, must be positive
power power: Q
weight_decay weight decay: Q
eps term added to the denominator to improve numerical stability: Q
Parameters:
Parameters for bert network:
batch_size batch size of input dataset: N, default is 16
seq_length length of input sequence: N, default is 128
vocab_size size of each embedding vector: N, must be consistant with the dataset you use. Default is 30522
hidden_size size of bert encoder layers: N
num_hidden_layers number of hidden layers: N
num_attention_heads number of attention heads: N, default is 12
intermediate_size size of intermediate layer: N
hidden_act activation function used: ACTIVATION, default is "gelu"
hidden_dropout_prob dropout probability for BertOutput: Q
attention_probs_dropout_prob dropout probability for BertAttention: Q
max_position_embeddings maximum length of sequences: N, default is 512
save_ckpt_step number for saving checkponit: N, default is 100
max_ckpt_num maximum number for saving checkpoint: N, default is 1
type_vocab_size size of token type vocab: N, default is 2
initializer_range initialization value of TruncatedNormal: Q, default is 0.02
use_relative_positions use relative positions or not: True | False, default is False
input_mask_from_dataset use the input mask loaded form dataset or not: True | False, default is True
token_type_ids_from_dataset use the token type ids loaded from dataset or not: True | False, default is True
dtype data type of input: mstype.float16 | mstype.float32, default is mstype.float32
compute_type compute type in BertTransformer: mstype.float16 | mstype.float32, default is mstype.float16
Training Process
Training
running on Ascend
Before running the command below, please check load_teacher_ckpt_path, data_dir and schma_dir has been set. Please set the path to be the absolute full path, e.g:"/username/checkpoint_100_300.ckpt".
bash scripts/run_standalone_gd.sh
The command above will run in the background, you can view the results the file log.txt. After training, you will get some checkpoint files under the script folder by default. The loss value will be achieved as follows:
# grep "epoch" log.txt
epoch: 1, step: 100, outpus are (Tensor(shape=[1], dtype=Float32, 28.2093), Tensor(shape=[], dtype=Bool, False), Tensor(shape=[], dtype=Float32, 65536))
epoch: 2, step: 200, outpus are (Tensor(shape=[1], dtype=Float32, 30.1724), Tensor(shape=[], dtype=Bool, False), Tensor(shape=[], dtype=Float32, 65536))
...
Attention This will bind the processor cores according to the
device_numand total processor numbers. If you don't expect to run pretraining with binding processor cores, remove the operations abouttasksetinscripts/run_distributed_gd_ascend.sh
running on GPU
Before running the command below, please check load_teacher_ckpt_path, data_dir schma_dir and device_target=GPU has been set. Please set the path to be the absolute full path, e.g:"/username/checkpoint_100_300.ckpt".
bash scripts/run_standalone_gd.sh
The command above will run in the background, you can view the results the file log.txt. After training, you will get some checkpoint files under the script folder by default. The loss value will be achieved as follows:
# grep "epoch" log.txt
epoch: 1, step: 100, outpus are 28.2093
...
Distributed Training
running on Ascend
Before running the command below, please check load_teacher_ckpt_path, data_dir and schma_dir has been set. Please set the path to be the absolute full path, e.g:"/username/checkpoint_100_300.ckpt".
bash scripts/run_distributed_gd_ascend.sh 8 1 /path/hccl.json
The command above will run in the background, you can view the results the file log.txt. After training, you will get some checkpoint files under the LOG* folder by default. The loss value will be achieved as follows:
# grep "epoch" LOG*/log.txt
epoch: 1, step: 100, outpus are (Tensor(shape=[1], dtype=Float32, 28.1478), Tensor(shape=[], dtype=Bool, False), Tensor(shape=[], dtype=Float32, 65536))
...
epoch: 1, step: 100, outpus are (Tensor(shape=[1], dtype=Float32, 30.5901), Tensor(shape=[], dtype=Bool, False), Tensor(shape=[], dtype=Float32, 65536))
...
running on GPU
Please input the path to be the absolute full path, e.g:"/username/checkpoint_100_300.ckpt".
bash scripts/run_distributed_gd_gpu.sh 8 1 /path/data/ /path/schema.json /path/teacher.ckpt
The command above will run in the background, you can view the results the file log.txt. After training, you will get some checkpoint files under the LOG* folder by default. The loss value will be achieved as follows:
# grep "epoch" LOG*/log.txt
epoch: 1, step: 1, outpus are 63.4098
...
Evaluation Process
Evaluation
If you want to after running and continue to eval, please set do_train=true and do_eval=true, If you want to run eval alone, please set do_train=false and do_eval=true. If running on GPU, please set device_target=GPU.
evaluation on SST-2 dataset
bash scripts/run_standalone_td.sh
The command above will run in the background, you can view the results the file log.txt. The accuracy of the test dataset will be as follows:
# grep "The best acc" log.txt
The best acc is 0.872685
The best acc is 0.893515
The best acc is 0.899305
...
The best acc is 0.902777
...
evaluation on MNLI dataset
Before running the command below, please check the load pretrain checkpoint path has been set. Please set the checkpoint path to be the absolute full path, e.g:"/username/pretrain/checkpoint_100_300.ckpt".
bash scripts/run_standalone_td.sh
The command above will run in the background, you can view the results the file log.txt. The accuracy of the test dataset will be as follows:
# grep "The best acc" log.txt
The best acc is 0.803206
The best acc is 0.803308
The best acc is 0.810355
...
The best acc is 0.813929
...
evaluation on QNLI dataset
Before running the command below, please check the load pretrain checkpoint path has been set. Please set the checkpoint path to be the absolute full path, e.g:"/username/pretrain/checkpoint_100_300.ckpt".
bash scripts/run_standalone_td.sh
The command above will run in the background, you can view the results the file log.txt. The accuracy of the test dataset will be as follows:
# grep "The best acc" log.txt
The best acc is 0.870772
The best acc is 0.871691
The best acc is 0.875183
...
The best acc is 0.891176
...
Model Description
Performance
training Performance
| Parameters | Ascend | GPU |
|---|---|---|
| Model Version | TinyBERT | TinyBERT |
| Resource | Ascend 910, cpu:2.60GHz 56cores, memory:314G | NV SMX2 V100-32G, cpu:2.10GHz 64cores, memory:251G |
| uploaded Date | 08/20/2020 | 08/24/2020 |
| MindSpore Version | 0.6.0 | 0.7.0 |
| Dataset | cn-wiki-128 | cn-wiki-128 |
| Training Parameters | src/gd_config.py | src/gd_config.py |
| Optimizer | AdamWeightDecay | AdamWeightDecay |
| Loss Function | SoftmaxCrossEntropy | SoftmaxCrossEntropy |
| outputs | probability | probability |
| Loss | 6.541583 | 6.6915 |
| Speed | 35.4ms/step | 98.654ms/step |
| Total time | 17.3h(3poch, 8p) | 48h(3poch, 8p) |
| Params (M) | 15M | 15M |
| Checkpoint for task distill | 74M(.ckpt file) | 74M(.ckpt file) |
Inference Performance
| Parameters | Ascend | GPU |
|---|---|---|
| Model Version | ||
| Resource | Ascend 910 | NV SMX2 V100-32G |
| uploaded Date | 08/20/2020 | 08/24/2020 |
| MindSpore Version | 0.6.0 | 0.7.0 |
| Dataset | SST-2, | SST-2 |
| batch_size | 32 | 32 |
| Accuracy | 0.902777 | 0.9086 |
| Speed | ||
| Total time | ||
| Model for inference | 74M(.ckpt file) | 74M(.ckpt file) |
Description of Random Situation
In run_standaloned_td.sh, we set do_shuffle to shuffle the dataset.
In gd_config.py and td_config.py, we set the hidden_dropout_prob and attention_pros_dropout_prob to dropout some network node.
In run_general_distill.py, we set the random seed to make sure distribute training has the same init weight.
ModelZoo Homepage
Please check the official homepage.