facetorch

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User Guide, Documentation, ChatGPT facetorch guide

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Facetorch is a Python library designed for facial detection and analysis, leveraging the power of deep neural networks. Its primary aim is to curate open-source face analysis models from the community, optimize them for high performance using TorchScript, and integrate them into a versatile face analysis toolkit. The library offers the following key features:

1. Customizable Configuration: Easily configure your setup using Hydra and its powerful OmegaConf capabilities.

2. Reproducible Environments: Ensure reproducibility with tools like conda-lock for dependency management and Docker for containerization.

3. Accelerated Performance: Enjoy enhanced performance on both CPU and GPU with TorchScript optimization.

4. Simple Extensibility: Extend the library by uploading your model file to Google Drive and adding a corresponding configuration YAML file to the repository.

Facetorch provides an efficient, scalable, and user-friendly solution for facial analysis tasks, catering to developers and researchers looking for flexibility and performance.

Please use this library responsibly and with caution. Adhere to the European Commission's Ethics Guidelines for Trustworthy AI to ensure ethical and fair usage. Keep in mind that the models may have limitations and potential biases, so it is crucial to evaluate their outputs critically and consider their impact.

Install

PyPI

pip install facetorch

Conda

conda install -c conda-forge facetorch

Usage

Prerequisites

• Docker
• Docker Compose

Docker Compose provides an easy way of building a working facetorch environment with a single command.

Run docker example

• CPU: docker compose run facetorch python ./scripts/example.py
• GPU: docker compose run facetorch-gpu python ./scripts/example.py analyzer.device=cuda

Check data/output for resulting images with bounding boxes and facial 3D landmarks.

(Apple Mac M1) Use Rosetta 2 emulator in Docker Desktop to run the CPU version.

Configure

The project is configured by files located in conf with the main file: conf/config.yaml. One can easily add or remove modules from the configuration.

Components

FaceAnalyzer is the main class of facetorch as it is the orchestrator responsible for initializing and running the following components:

1. Reader - reads the image and returns an ImageData object containing the image tensor.
2. Detector - wrapper around a neural network that detects faces.
3. Unifier - processor that unifies sizes of all faces and normalizes them between 0 and 1.
4. Predictor dict - set of wrappers around neural networks trained to analyze facial features.
5. Utilizer dict - set of wrappers around any functionality that requires the output of neural networks e.g. drawing bounding boxes or facial landmarks.

Structure

analyzer
    ├── reader
    ├── detector
    ├── unifier
    └── predictor
            ├── embed
            ├── verify
            ├── fer
            ├── au
            ├── va
            ├── deepfake
            └── align
    └── utilizer
            ├── align
            ├── draw
            └── save

Models

Detector

|     model     |   source  |   params  |   license   | version |
| ------------- | --------- | --------- | ----------- | ------- |
|   RetinaFace  |  biubug6  |   27.3M   | MIT license |    1    |

1. biubug6
   • code: Pytorch_Retinaface
   • paper: Deng et al. - RetinaFace: Single-Shot Multi-Level Face Localisation in the Wild

Predictor

Facial Representation Learning (embed)

|       model       |   source   |  params |   license   | version |  
| ----------------- | ---------- | ------- | ----------- | ------- |
|  ResNet-50 VGG 1M |  1adrianb  |  28.4M  | MIT license |    1    |

1. 1adrianb
   • code: unsupervised-face-representation
   • paper: Bulat et al. - Pre-training strategies and datasets for facial representation learning
   • Note: include_tensors needs to be True in order to include the model prediction in Prediction.logits

Face Verification (verify)

|       model      |   source    |  params  |      license       | version |  
| ---------------- | ----------- | -------- | ------------------ | ------- |
|    MagFace+UNPG  | Jung-Jun-Uk |   65.2M  | Apache License 2.0 |    1    |
|  AdaFaceR100W12M |  mk-minchul |    -     |     MIT License    |    2    |

1. Jung-Jun-Uk
   • code: UNPG
   • paper: Jung et al. - Unified Negative Pair Generation toward Well-discriminative Feature Space for Face Recognition
   • (FAR=0.01)
   • Note: include_tensors needs to be True in order to include the model prediction in Prediction.logits
2. mk-minchul
   • code: AdaFace
   • paper: Kim et al. - AdaFace: Quality Adaptive Margin for Face Recognition
   • <
   • <
   • < badges represent models trained on smaller WebFace 4M dataset
   • Note: include_tensors needs to be True in order to include the model prediction in Prediction.logits

Facial Expression Recognition (fer)

|       model       |      source    |  params  |       license      | version |  
| ----------------- | -------------- | -------- | ------------------ | ------- |
| EfficientNet B0 7 | HSE-asavchenko |    4M    | Apache License 2.0 |    1    |
| EfficientNet B2 8 | HSE-asavchenko |   7.7M   | Apache License 2.0 |    2    |

1. HSE-asavchenko
   • code: face-emotion-recognition
   • paper: Savchenko - Facial expression and attributes recognition based on multi-task learning of lightweight neural networks
   • B2
   • B0
   • B0

Facial Action Unit Detection (au)

|        model        |   source  |  params |       license      | version |  
| ------------------- | --------- | ------- | ------------------ | ------- |
| OpenGraph Swin Base |  CVI-SZU  |   94M   |     MIT License    |    1    |

1. CVI-SZU
   • code: ME-GraphAU
   • paper: Luo et al. - Learning Multi-dimensional Edge Feature-based AU Relation Graph for Facial Action Unit Recognition
   • ! Does not work with CUDA > 12.0

Facial Valence Arousal (va)

|       model       |   source   |  params |   license   | version |
| ----------------- | ---------- | ------- | ----------- | ------- |
|  ELIM AL AlexNet  | kdhht2334  |  2.3M   | MIT license |    1    |

1. kdhht2334
   • code: ELIM
   • paper: Kim et al. - Optimal Transport-based Identity Matching for Identity-invariant Facial Expression Recognition

Deepfake Detection (deepfake)

|         model        |      source      |  params  |   license   | version |
| -------------------- | ---------------- | -------- | ----------- | ------- |
|    EfficientNet B7   |     selimsef     |   66.4M  | MIT license |    1    |

1. selimsef
   • code: dfdc_deepfake_challenge
   • challenge: Seferbekov - Deepfake Detection Challenge 1st place solution

Face Alignment (align)

|       model       |      source      |  params  |   license   | version |
| ----------------- | ---------------- | -------- | ----------- | ------- |
|    MobileNet v2   |     choyingw     |   4.1M   | MIT license |    1    |

1. choyingw
   • code: SynergyNet
   • challenge: Wu et al. - Synergy between 3DMM and 3D Landmarks for Accurate 3D Facial Geometry
   • Note: include_tensors needs to be True in order to include the model prediction in Prediction.logits

Model download

Models are downloaded during runtime automatically to the models directory. You can also download the models manually from a public Google Drive folder.

Execution time

Image test.jpg (4 faces) is analyzed (including drawing boxes and landmarks, but not saving) in about 486ms and test3.jpg (25 faces) in about 1845ms (batch_size=8) on NVIDIA Tesla T4 GPU once the default configuration (conf/config.yaml) of models is initialized and pre heated to the initial image size 1080x1080 by the first run. One can monitor the execution times in logs using the DEBUG level.

Detailed test.jpg execution times:

analyzer
    ├── reader: 27 ms
    ├── detector: 193 ms
    ├── unifier: 1 ms
    └── predictor
            ├── embed: 8 ms
            ├── verify: 58 ms
            ├── fer: 28 ms
            ├── au: 57 ms
            ├── va: 1 ms
            ├── deepfake: 117 ms
            └── align: 5 ms
    └── utilizer
            ├── align: 8 ms
            ├── draw_boxes: 22 ms
            ├── draw_landmarks: 7 ms
            └── save: 298 ms

Development

Run the Docker container:

• CPU: docker compose -f docker-compose.dev.yml run facetorch-dev
• GPU: docker compose -f docker-compose.dev.yml run facetorch-dev-gpu

Add predictor

Prerequisites

1. file of the TorchScript model
2. ID of the Google Drive model file
3. facetorch fork

Facetorch works with models that were exported from PyTorch to TorchScript. You can apply torch.jit.trace function to compile a PyTorch model as a TorchScript module. Please verify that the output of the traced model equals the output of the original model.

The first models are hosted on my public Google Drive folder. You can either send the new model for upload to me, host the model on your Google Drive or host it somewhere else and add your own downloader object to the codebase.

Configuration

Create yaml file

1. Create new folder with a short name of the task in predictor configuration directory /conf/analyzer/predictor/ following the FER example in /conf/analyzer/predictor/fer/
2. Copy the yaml file /conf/analyzer/predictor/fer/efficientnet_b2_8.yaml to the new folder /conf/analyzer/predictor/<predictor_name>/
3. Change the yaml file name to the model you want to use: /conf/analyzer/predictor/<predictor_name>/<model_name>.yaml

Edit yaml file

1. Change the Google Drive file ID to the ID of the model.
2. Select the preprocessor (or implement a new one based on BasePredPreProcessor) and specify it's parameters e.g. image size and normalization in the yaml file to match the requirements of the new model.
3. Select the postprocessor (or implement a new one based on BasePredPostProcessor) and specify it's parameters e.g. labels in the yaml file to match the requirements of the new model.
4. (Optional) Add BaseUtilizer derivative that uses output of your model to perform some additional actions.

Configure tests

1. Add a new predictor to the main config.yaml and all tests.config.n.yaml files. Alternatively, create a new config file e.g. tests.config.n.yaml and add it to the /tests/conftest.py file.
2. Write a test for the new predictor in /tests/test_<predictor_name>.py

Test and submit

1. Run linting: black facetorch
2. Add the new predictor to the README model table.
3. Update CHANGELOG and version
4. Submit a pull request to the repository

Update environment

CPU:

• Add packages with corresponding versions to environment.yml file
• Lock the environment: conda lock -p linux-64 -f environment.yml --lockfile conda-lock.yml
• (Alternative Docker) Lock the environment: docker compose -f docker-compose.dev.yml run facetorch-lock
• Install the locked environment: conda-lock install --name env conda-lock.yml

GPU:

• Add packages with corresponding versions to gpu.environment.yml file
• Lock the environment: conda lock -p linux-64 -f gpu.environment.yml --lockfile gpu.conda-lock.yml
• (Alternative Docker) Lock the environment: docker compose -f docker-compose.dev.yml run facetorch-lock-gpu
• Install the locked environment: conda-lock install --name env gpu.conda-lock.yml

Run tests + coverage

• Run tests and generate coverage: pytest tests --verbose --cov-report html:coverage --cov facetorch

Generate documentation

• Generate documentation from docstrings using pdoc3: pdoc --html facetorch --output-dir docs --force --template-dir pdoc/templates/

Profiling

1. Run profiling of the example script: python -m cProfile -o profiling/example.prof scripts/example.py
2. Open profiling file in the browser: snakeviz profiling/example.prof

Research Highlights Leveraging facetorch

Sharma et al. (2024)

Sharma, Paritosh, Camille Challant, and Michael Filhol. "Facial Expressions for Sign Language Synthesis using FACSHuman and AZee." Proceedings of the LREC-COLING 2024 11th Workshop on the Representation and Processing of Sign Languages, pp. 354–360, 2024.

Liang et al. (2023)

Liang, Cong, Jiahe Wang, Haofan Zhang, Bing Tang, Junshan Huang, Shangfei Wang, and Xiaoping Chen. "Unifarn: Unified transformer for facial reaction generation." Proceedings of the 31st ACM International Conference on Multimedia, pp. 9506–9510, 2023.

Gue et al. (2023)

Gue, Jia Xuan, Chun Yong Chong, and Mei Kuan Lim. "Facial Expression Recognition as markers of Depression." 2023 Asia Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC), pp. 674–680, 2023.

Acknowledgements

I would like to thank the open-source community and the researchers who have shared their work and published models. This project would not have been possible without their contributions.

Citing

If you use facetorch in your work, please make sure to appropriately credit the original authors of the models it employs. Additionally, you may consider citing the facetorch library itself. Below is an example citation for facetorch:

@misc{facetorch,
    author = {Gajarsky, Tomas},
    title = {Facetorch: A Python Library for Analyzing Faces Using PyTorch},
    year = {2024},
    publisher = {GitHub},
    journal = {GitHub Repository},
    howpublished = {url{https://github.com/tomas-gajarsky/facetorch}}
}

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