Realtime Multi-Person Pose Estimation

This is a keras version of Realtime Multi-Person Pose Estimation project

Introduction

Code repo for reproducing 2017 CVPR paper using keras.

This is a new improved version. The main objective was to remove dependency on separate c++ server which besides the complexity of compiling also contained some bugs... and was very slow. The old version utilizing rmpe_dataset_server is still available under the tag v0.1 if you really would like to take a look.

Results

 

Contents

1. Converting caffe model
2. Testing
3. Training
4. Changes

Require

1. Keras
2. Caffe - docker required if you would like to convert caffe model to keras model. You don't have to compile/install caffe on your local machine.

Converting Caffe model to Keras model

Authors of original implementation released already trained caffe model which you can use to extract weights data.

• Download caffe model cd model; sh get_caffe_model.sh
• Dump caffe layers to numpy data cd ..; docker run -v [absolute path to your keras_Realtime_Multi-Person_Pose_Estimation folder]:/workspace -it bvlc/caffe:cpu python dump_caffe_layers.py Note that docker accepts only absolute paths so you have to set the full path to the folder containing this project.
• Convert caffe model (from numpy data) to keras model python caffe_to_keras.py

Testing steps

• Convert caffe model to keras model or download already converted keras model https://www.dropbox.com/s/llpxd14is7gyj0z/model.h5
• Run the notebook demo.ipynb.
• python demo_image.py --image sample_images/ski.jpg to run the picture demo. Result will be stored in the file result.png. You can use any image file as an input.

Training steps

• Install gsutil curl https://sdk.cloud.google.com | bash. This is a really helpful tool for downloading large datasets.
• Download the data set (~25 GB) cd dataset; sh get_dataset.sh,
• Download COCO official toolbox in dataset/coco/ .
• cd coco/PythonAPI; sudo python setup.py install to install pycocotools.
• Go to the "training" folder cd ../../../training.
• Optionally, you can set the number of processes used to generate samples in parallel dataset.py -> find the line df = PrefetchDataZMQ(df, nr_proc=4)
• Run the command in terminal python train_pose.py

Changes

25/06/2018

• Performance improvement thanks to replacing c++ server rmpe_dataset_server with tensorpack dataflow. Tensorpack is a very efficient library for preprocessing and data loading for tensorflow models. Dataflow object behaves like a normal Python iterator but it can generate samples using many processes. This significantly reduces latency when GPU waits for the next sample to be processed.

• Masks generated on the fly - no need to run separate scripts to generate masks. In fact most of the mask were only positive (nothing to mask out)

• Masking out the discarded persons who are too close to the main person in the picture, so that the network never sees unlabelled people. Previously we filtered out keypoints of such smaller persons but they were still visible in the picture.

• Incorrect handling of masks has been fixed. The rmpe_dataset_server sometimes assigned a wrong mask to the image, misleading the network.

26/10/2017

Fixed problem with the training procedure. Here are my results after training for 5 epochs = 25000 iterations (1 epoch is ~5000 batches) The loss values are quite similar as in the original training - output.txt

Results of running demo_image --image sample_images/ski.jpg --model training/weights.best.h5 with model trained only 25000 iterations. Not too bad !!! Training on my single 1070 GPU took around 10 hours.

22/10/2017

Augmented samples are fetched from the server. The network never sees the same image twice which was a problem in previous approach (tool rmpe_dataset_transformer) This allows you to run augmentation locally or on separate node. You can start 2 instances, one serving training set and a second one serving validation set (on different port if locally)

Related repository

• CVPR'16, Convolutional Pose Machines.
• CVPR'17, Realtime Multi-Person Pose Estimation.

Citation

Please cite the paper in your publications if it helps your research:

@InProceedings{cao2017realtime,
  title = {Realtime Multi-Person 2D Pose Estimation using Part Affinity Fields},
  author = {Zhe Cao and Tomas Simon and Shih-En Wei and Yaser Sheikh},
  booktitle = {The IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  year = {2017}
  }