• Contents
• CycleGAN Description
• Model Architecture
• Dataset
• Environment Requirements
• Script Description
• • Script and Sample Code
  • Script Parameters
  • Training
  • Evaluation
  • ONNX evaluation
  • Inference Process
  • • Export MindIR
    • Infer on Ascend310
    • Result
• Model Description
• • Performance
  • • Training Performance
    • Evaluation Performance
• ModelZoo Homepage

Contents

• CycleGAN Description
• Model Architecture
• Dataset
• Environment Requirements
• Script Description
  • Script and Sample Code
  • Script Parameters
  • Training
  • Evaluation
  • ONNX evaluation
  • Inference Process
    • Export MindIR
    • Infer on Ascend310
    • Result
• Model Description
  • Performance
    • Training Performance
    • Evaluation Performance
• ModelZoo Homepage

CycleGAN Description

Image-to-image translation is a visual and image problem. Its goal is to use paired images as a training set and (let the machine) learn the mapping from input images to output images. However, in many tasks, paired training data cannot be obtained. CycleGAN does not require the training data to be paired. It only needs to provide images of different domains to successfully train the image mapping between different domains. CycleGAN shares two generators, and then each has a discriminator.

Paper: Zhu J Y , Park T , Isola P , et al. Unpaired Image-to-Image Translation using Cycle-Consistent Adversarial Networks[J]. 2017.

Model Architecture

The CycleGAN contains two generation networks and two discriminant networks.

Dataset

Download CycleGAN datasets and create your own datasets. We provide data/download_cyclegan_dataset.sh to download the datasets.

Environment Requirements

• Hardware（Ascend/GPU/CPU）
  • Prepare hardware environment with Ascend or GPU or CPU processor.
• Framework
  • MindSpore
• For more information, please check the resources below：
  • MindSpore tutorials
  • MindSpore Python API

Script Description

Script and Sample Code

The entire code structure is as following:

.CycleGAN
├─ README.md                            # descriptions about CycleGAN
├─ data
  └─ download_cyclegan_dataset.sh.py    # download dataset
├── scripts
  └─ run_train_ascend.sh                # launch ascend training(1 pcs)
  └─ run_train_standalone_gpu.sh        # launch gpu training(1 pcs)
  └─ run_train_distributed_gpu.sh       # launch gpu training(8 pcs)
  └─ run_infer_310.sh                   # launch 310 infer
├─ imgs
  └─ objects-transfiguration.jpg        # CycleGAN Imgs
├─ ascend310_infer
  ├─ src
    ├─ main.cc                         # Ascend-310 inference source code
    └─ utils.cc                        # Ascend-310 inference source code
  ├─ inc
    └─ utils.h                         # Ascend-310 inference source code
  ├─ build.sh                          # Ascend-310 inference source code
  ├─ CMakeLists.txt                    # CMakeLists of Ascend-310 inference program
  └─ fusion_switch.cfg                 # Use BatchNorm2d instead of InstanceNorm2d
├─ src
  ├─ __init__.py                       # init file
  ├─ dataset
    ├─ __init__.py                     # init file
    ├─ cyclegan_dataset.py             # create cyclegan dataset
    └─ distributed_sampler.py          # iterator of dataset
  ├─ models
    ├─ __init__.py                     # init file
    ├─ cycle_gan.py                    # cyclegan model define
    ├─ losses.py                       # cyclegan losses function define
    ├─ networks.py                     # cyclegan sub networks define
    ├─ resnet.py                       # resnet generate network
    └─ depth_resnet.py                 # better generate network
  └─ utils
    ├─ __init__.py                     # init file
    ├─ args.py                         # parse args
    ├─ reporter.py                     # Reporter class
    └─ tools.py                        # utils for cyclegan
├─ eval.py                             # generate images from A->B and B->A
├─ train.py                            # train script
├─ export.py                           # export mindir script
├─ preprocess.py                       # data preprocessing script for scend-310 inference
└─ postprocess.py                      # data post-processing script for scend-310 inference

Script Parameters

Major parameters in train.py and config.py as follows:

"platform": Ascend       # run platform, support GPU and Ascend and CPU.
"device_id": 0           # device id, default is 0.
"model": "resnet"        # generator model.
"pool_size": 50          # the size of image buffer that stores previously generated images, default is 50.
"lr_policy": "linear"    # learning rate policy, default is linear.
"image_size": 256        # input image_size, default is 256.
"batch_size": 1          # batch_size, default is 1.
"max_epoch": 200         # epoch size for training, default is 200.
"in_planes": 3           # input channels, default is 3.
"ngf": 64                # generator model filter numbers, default is 64.
"gl_num": 9              # generator model residual block numbers, default is 9.
"ndf": 64                # discriminator model filter numbers, default is 64.
"dl_num": 3              # discriminator model residual block numbers, default is 3.
"outputs_dir": "outputs" # models are saved here, default is ./outputs.
"dataroot": None         # path of images (should have subfolders trainA, trainB, testA, testB, etc).
"load_ckpt": False       # whether load pretrained ckpt.
"G_A_ckpt": None         # pretrained checkpoint file path of G_A.
"G_B_ckpt": None         # pretrained checkpoint file path of G_B.
"D_A_ckpt": None         # pretrained checkpoint file path of D_A.
"D_B_ckpt": None         # pretrained checkpoint file path of D_B.

Training

• running on Ascend with default parameters

  bash scripts/run_train_ascend.sh [DATA_PATH] [EPOCH_SIZE]
  # epoch_size is recommended 200
  

• running on GPU with default parameters

  bash scripts/run_train_standalone_gpu.sh [DATA_PATH] [EPOCH_SIZE]
  # epoch_size is recommended 200
  

• running on 8 GPUs with default parameters

  bash scripts/run_train_distributed_gpu.sh [DATA_PATH] [EPOCH_SIZE]
  # epoch_size is recommended 600
  

• running on CPU with default parameters

  python train.py --platform CPU --dataroot [DATA_PATH] --use_random False --max_epoch [EPOCH_SIZE] --print_iter 1 pool_size 0
  

Evaluation

python eval.py --platform [PLATFORM] --dataroot [DATA_PATH] --G_A_ckpt [G_A_CKPT] --G_B_ckpt [G_B_CKPT]

Note: You will get the result as following in "./outputs_dir/predict".

ONNX evaluation

First, export your models:

python export.py --platform GPU --model ResNet --G_A_ckpt /path/to/GA.ckpt --G_B_ckpt /path/to/GB.ckpt --export_file_name /path/to/<prefix> --export_file_format ONNX

You will get two .onnx files: /path/to/<prefix>_AtoB.onnx and /path/to/<prefix>_BtoA.onnx

Next, run ONNX eval with the same export_file_name as in export:

python eval_onnx.py --platform [PLATFORM] --dataroot [DATA_PATH] --export_file_name /path/to/<prefix>

Note: You will get the result as following in "./outputs_dir/predict".

Inference Process

Before inference, please refer to MindSpore Inference with C++ Deployment Guide to set environment variables.

Export MindIR

python export.py --G_A_ckpt [CKPT_PATH_A] --G_B_ckpt [CKPT_PATH_A] --export_batch_size 1 --export_file_name [FILE_NAME] --export_file_format [FILE_FORMAT]

Infer on Ascend310

Before performing inference, the mindir file must be exported by export.py.Current batch_Size can only be set to 1.

# Ascend310 inference
bash ./scripts/run_infer_310.sh [MINDIR_PATH] [DATA_PATH] [DATA_MODE] [NEED_PREPROCESS] [DEVICE_TARGET] [DEVICE_ID]

• DATA_PATH is mandatory, and must specify original data path.
• DATA_MODE is the translation direction of CycleGAN, it's value is 'AtoB' or 'BtoA'.
• NEED_PREPROCESS means weather need preprocess or not, it's value is 'y' or 'n'.
• DEVICE_ID is optional, default value is 0.

for example, on Ascend:

bash ./scripts/run_infer_310.sh ./310_infer/CycleGAN_AtoB.mindir ./data/horse2zebra AtoB y Ascend 0

Result

Inference result is saved in current path, you can find result in infer_output_img file.

Model Description

Performance

Training Performance

We use Depth Resnet Generator on Ascend and Resnet Generator on GPU.

Parameters	single Ascend/GPU	8 GPUs
Model Version	CycleGAN	CycleGAN
Resource	Ascend 910/NV SMX2 V100-32G	NV SMX2 V100-32G x 8
MindSpore Version	1.2	1.2
Dataset	horse2zebra	horse2zebra
Training Parameters	epoch=200, steps=1334, batch_size=1, lr=0.0002	epoch=600, steps=166, batch_size=8, lr=0.0002
Optimizer	Adam	Adam
Loss Function	Mean Sqare Loss & L1 Loss	Mean Sqare Loss & L1 Loss
outputs	probability	probability
Speed	1pc(Ascend): 123 ms/step; 1pc(GPU): 190 ms/step	190 ms/step
Total time	1pc(Ascend): 9.6h; 1pc(GPU): 14.9h;	5.7h
Checkpoint for Fine tuning	44M (.ckpt file)	44M (.ckpt file)

Evaluation Performance

Parameters	single Ascend/GPU
Model Version	CycleGAN
Resource	Ascend 910/NV SMX2 V100-32G
MindSpore Version	1.2
Dataset	horse2zebra
batch_size	1
outputs	transferred images

ModelZoo Homepage

Please check the official homepage.