mindspore/model_zoo/official/cv/resnet50_quant

• Contents
• ResNet50 Description
• Model Architecture
• Dataset
• Features
• • Mixed Precision
• Environment Requirements
• Script description
• • Script and sample code
  • Script Parameters
  • Training process
  • • Usage
    • Launch
    • Result
  • Evaluation process
  • • Usage
    • Launch
    • Result
• Model description
• • Performance
  • • Evaluation Performance
    • Inference Performance
• Description of Random Situation
• ModelZoo Homepage

Contents

• ResNet50 Description
• Model Architecture
• Dataset
• Features
  • Mixed Precision
• Environment Requirements
• Script Description
  • Script and Sample Code
  • Script Parameters
  • Training Process
  • Evaluation Process
• Model Description
  • Performance
    • Evaluation Performance
    • Inference Performance
• Description of Random Situation
• ModelZoo Homepage

ResNet50 Description

ResNet-50 is a convolutional neural network that is 50 layers deep, which can classify ImageNet image to 1000 object categories with 76% accuracy.

Paper: Kaiming He, Xiangyu Zhang, Shaoqing Ren, Jian Sun."Deep Residual Learning for Image Recognition." He, Kaiming , et al. "Deep Residual Learning for Image Recognition." IEEE Conference on Computer Vision & Pattern Recognition IEEE Computer Society, 2016.

This is the quantitative network of ResNet50.

Model Architecture

The overall network architecture of Resnet50 is show below:

Link

Dataset

Dataset used: ImageNet2012

• Dataset size 224*224 colorful images in 1000 classes
  • Train：1,281,167 images
  • Test： 50,000 images
• Data format：jpeg
  • Note：Data will be processed in dataset.py
• Download the dataset, the directory structure is as follows:

└─dataset
   ├─ilsvrc                # train dataset
   └─validation_preprocess # evaluate dataset

Features

Mixed Precision

The mixed precision training method accelerates the deep learning neural network training process by using both the single-precision and half-precision data formats, and maintains the network precision achieved by the single-precision training at the same time. Mixed precision training can accelerate the computation process, reduce memory usage, and enable a larger model or batch size to be trained on specific hardware.
For FP16 operators, if the input data type is FP32, the backend of MindSpore will automatically handle it with reduced precision. Users could check the reduced-precision operators by enabling INFO log and then searching ‘reduce precision’.

Environment Requirements

• Hardware:Ascend
  • Prepare hardware environment with Ascend. If you want to try Ascend , please send the application form to ascend@huawei.com. Once approved, you can get the resources.
• Framework
  • MindSpore
• For more information, please check the resources below：
  • MindSpore Tutorials
  • MindSpore Python API

Script description

Script and sample code

├── resnet50_quant
  ├── README.md     # descriptions about Resnet50-Quant
  ├── scripts
  │   ├──run_train.sh   # shell script for train on Ascend
  │   ├──run_infer.sh   # shell script for evaluation on Ascend
  ├── models
  │   ├──resnet_quant.py           # define the network model of resnet50-quant
  │   ├──resnet_quant_manual.py    # define the manually quantized network model of resnet50-quant
  ├── src
  │   ├──config.py      # parameter configuration
  │   ├──dataset.py     # creating dataset
  │   ├──launch.py      # start python script
  │   ├──lr_generator.py     # learning rate config
  │   ├──crossentropy.py     # define the crossentropy of resnet50-quant
  ├── train.py      # training script
  ├── eval.py       # evaluation script

Script Parameters

Parameters for both training and evaluation can be set in config.py

• config for Resnet50-quant, ImageNet2012 dataset

  'class_num': 10               # the number of classes in the dataset
  'batch_size': 32              # training batch size
  'loss_scale': 1024            # the initial loss_scale value
  'momentum': 0.9               # momentum
  'weight_decay': 1e-4          # weight decay value
  'epoch_size': 120             # total training epochs
  'pretrained_epoch_size': 90   # pretraining epochs of resnet50, which is unquantative network of resnet50_quant
  'data_load_mode': 'mindata'   # the style of loading data into device
  'save_checkpoint':True        # whether save checkpoint file after training finish
  'save_checkpoint_epochs': 1   # the step from which start to save checkpoint file.
  'keep_checkpoint_max': 50     # only keep the last keep_checkpoint_max checkpoint
  'save_checkpoint_path': './'  # the absolute full path to save the checkpoint file
  "warmup_epochs": 0            # number of warmup epochs
  'lr_decay_mode': "cosine"     # learning rate decay mode, including steps, steps_decay, cosine or liner
  'use_label_smooth': True      # whether use label smooth
  'label_smooth_factor': 0.1    # label smooth factor
  'lr_init': 0                  # initial learning rate
  'lr_max': 0.005               # the max learning rate
  

Training process

Usage

• Ascend: sh run_train.sh Ascend [RANK_TABLE_FILE] [DATASET_PATH] [PRETRAINED_CKPT_PATH](optional)

Launch

  # training example
  Ascend: bash run_train.sh Ascend ~/hccl.json ~/imagenet/train/ ~/pretrained_ckeckpoint

Result

Training result will be stored in the example path. Checkpoints will be stored at ./train/device$i/ by default, and training log will be redirected to ./train/device$i/train.log like followings.

epoch: 1 step: 5004, loss is 4.8995576
epoch: 2 step: 5004, loss is 3.9235563
epoch: 3 step: 5004, loss is 3.833077
epoch: 4 step: 5004, loss is 3.2795618
epoch: 5 step: 5004, loss is 3.1978393

Evaluation process

Usage

You can start training using python or shell scripts. The usage of shell scripts as follows:

• Ascend: sh run_infer.sh Ascend [DATASET_PATH] [CHECKPOINT_PATH]

Launch

# infer example
  shell:
      Ascend: sh run_infer.sh Ascend ~/imagenet/val/ ~/train/Resnet50-30_5004.ckpt

checkpoint can be produced in training process.

Result

Inference result will be stored in the example path, you can find result like the followings in ./eval/infer.log.

result: {'acc': 0.76576314102564111}

Model description

Performance

Evaluation Performance

Parameters	Ascend
Model Version	ResNet50 V1.5
Resource	Ascend 910, CPU 2.60GHz, 56cores, Memory 314G
uploaded Date	06/06/2020 (month/day/year)
MindSpore Version	0.3.0-alpha
Dataset	ImageNet
Training Parameters	epoch=30(with pretrained) or 120, steps per epoch=5004, batch_size=32
Optimizer	Momentum
Loss Function	Softmax Cross Entropy
outputs	probability
Loss	1.8
Speed	8pcs: 407 ms/step
Total time	8pcs: 17 hours(30 epochs with pretrained)
Parameters (M)	25.5
Checkpoint for Fine tuning	197M (.ckpt file)
Scripts	resnet50-quant script

Inference Performance

Parameters	Ascend
Model Version	ResNet50 V1.5
Resource	Ascend 910, CPU 2.60GHz, 56cores, Memory 314G
Uploaded Date	06/06/2020 (month/day/year)
MindSpore Version	0.3.0-alpha
Dataset	ImageNet
batch_size	32
outputs	probability
Accuracy	ACC1[76.57%] ACC5[92.90%]
Model for inference	197M (.ckpt file)

Description of Random Situation

In dataset.py, we set the seed inside “create_dataset" function. We also use random seed in train.py.

ModelZoo Homepage

Please check the official homepage.