PyMAF

This repository contains the code for the following paper:

PyMAF: 3D Human Pose and Shape Regression with Pyramidal Mesh Alignment Feedback Loop
Hongwen Zhang*, Yating Tian*, Xinchi Zhou, Wanli Ouyang, Yebin Liu, Limin Wang, Zhenan Sun
* Equal contribution

ICCV, 2021 (Oral Paper)

[Project Page] [Paper]

Requirements

Python 3.6.10

packages

PyTorch tested on version 1.1.0
torchvision tested on version 0.3.0
Neural Renderer (render densepose labels for training)
opendr (visualization in training)
pyrender (optional for demo)
other packages listed in requirements.txt

necessary files

mesh_downsampling.npz & DensePose UV data

Run the following script to fetch mesh_downsampling.npz & DensePose UV data from other repositories.

bash fetch_data.sh

SMPL model files

Collect SMPL model files from https://smpl.is.tue.mpg.de and UP. Rename model files and put them into the ./data/smpl directory.

Fetch preprocessed data from SPIN.

Download the pre-trained model and put it into the ./data/pretrained_model directory.

After collecting the above necessary files, the directory structure of ./data is expected as follows.

./data
├── dataset_extras
│   └── .npz files
├── J_regressor_extra.npy
├── J_regressor_h36m.npy
├── mesh_downsampling.npz
├── pretrained_model
│   └── PyMAF_model_checkpoint.pt
├── smpl
│   ├── SMPL_FEMALE.pkl
│   ├── SMPL_MALE.pkl
│   └── SMPL_NEUTRAL.pkl
├── smpl_mean_params.npz
├── static_fits
│   └── .npy files
└── UV_data
    ├── UV_Processed.mat
    └── UV_symmetry_transforms.mat

Demo

[UPDATE] You can first give it a try on Google Colab using the notebook we have prepared, which is no need to prepare the environment yourself:

Run the demo code.

For image input:

python3 demo.py --checkpoint=data/pretrained_model/PyMAF_model_checkpoint.pt --img_file examples/COCO_val2014_000000019667.jpg

For video input:

python3 demo.py --checkpoint=data/pretrained_model/PyMAF_model_checkpoint.pt --vid_file examples/flashmob.mp4

^{Frame by frame reconstruction. Video clipped from here.}

More results: Project Page

Evaluation

COCO Keypoint Localization

Download the preprocessed data coco_2014_val.npz. Put it into the ./data/dataset_extras directory.
Run the COCO evaluation code.

python3 eval_coco.py --checkpoint=data/pretrained_model/PyMAF_model_checkpoint.pt

Results in Average Precision (AP):

Method	AP ↑	AP₅₀ ↑	AP₇₅ ↑	AP_M ↑	AP_L ↑
HMR	18.9	47.5	11.7	21.5	17.0
SPIN	17.3	39.1	13.5	19.0	16.6
Baseline	16.8	38.2	12.8	18.5	16.0
PyMAF	24.6	48.9	22.7	26.0	24.2

Human3.6M / 3DPW

Run the evaluation code. Using --dataset to specify the evaluation dataset.

# Example usage:

# Human3.6M Protocol 2
python3 eval.py --checkpoint=data/pretrained_model/PyMAF_model_checkpoint.pt --dataset=h36m-p2 --log_freq=20

# 3DPW
python3 eval.py --checkpoint=data/pretrained_model/PyMAF_model_checkpoint.pt --dataset=3dpw --log_freq=20

Results in Mean Per Joint Position Error (MPJPE):

Method	3DPW ↓	H36M ↓
SPIN	96.9	62.5
VIBE	93.5	65.9
Baseline	98.5	64.8
PyMAF	92.8	57.7

Training

To perform training, we need to collect preprocessed files of training datasets at first.

The preprocessed labels have the same format as SPIN and can be retrieved from here. Please refer to SPIN for more details about data preprocessing.

PyMAF is trained on Human3.6M at the first stage and then trained on the mixture of both 2D and 3D datasets at the second stage. Example usage:

# training on Human3.6M
CUDA_VISIBLE_DEVICES=0 python3 train.py --regressor pymaf_net --single_dataset --misc TRAIN.BATCH_SIZE 64
# training on mixed datasets
CUDA_VISIBLE_DEVICES=0 python3 train.py --regressor pymaf_net --pretrained_checkpoint path/to/checkpoint_file.pt --misc TRAIN.BATCH_SIZE 64

Running the above commands will use Human3.6M or mixed datasets for training, respectively. We can monitor the training process by setting up a TensorBoard at the directory ./logs.

Citation

If this work is helpful in your research, please cite the following paper.

@inproceedings{pymaf2021,
  title={PyMAF: 3D Human Pose and Shape Regression with Pyramidal Mesh Alignment Feedback Loop},
  author={Zhang, Hongwen and Tian, Yating and Zhou, Xinchi and Ouyang, Wanli and Liu, Yebin and Wang, Limin and Sun, Zhenan},
  booktitle={Proceedings of the IEEE International Conference on Computer Vision},
  year={2021}
}

Acknowledgments

The code is developed upon the following projects. Many thanks to their contributions.

cedro3/PyMAF