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NVIDIA TensorFlow 2.x Quantization

This TensorFlow 2.x Quantization toolkit quantizes (inserts Q/DQ nodes) TensorFlow 2.x Keras models for Quantization-Aware Training (QAT). We follow NVIDIA's QAT recipe, which leads to optimal model acceleration with TensorRT on NVIDIA GPUs and hardware accelerators.

Features

  • Implements NVIDIA Quantization recipe.
  • Supports fully automated or manual insertion of Quantization and DeQuantization (QDQ) nodes in the TensorFlow 2.x model with minimal code.
  • Can easily to add support for new layers.
  • Quantization behavior can be set programmatically.
  • Implements automatic tests for popular architecture blocks such as residual and inception.
  • Offers utilities for TensorFlow 2.x to TensorRT conversion via ONNX.
  • Includes example workflows.

Dependencies

Python >= 3.8
TensorFlow >= 2.8
tf2onnx >= 1.10.1
onnx-graphsurgeon
pytest
pytest-html
TensorRT (optional) >= 8.4 GA

Installation

Docker

Latest TensorFlow 2.x docker image from NGC is recommended.

$ cd ~/
$ git clone https://github.com/NVIDIA/TensorRT.git
$ docker pull nvcr.io/nvidia/tensorflow:22.03-tf2-py3
$ docker run -it --runtime=nvidia --gpus all --net host -v ~/TensorRT/tools/tensorflow-quantization:/home/tensorflow-quantization nvcr.io/nvidia/tensorflow:22.03-tf2-py3 /bin/bash

After last command, you will be placed in /workspace directory inside the running docker container whereas tensorflow-quantization repo is mounted in /home directory.

$ cd /home/tensorflow-quantization
$ ./install.sh
$ cd tests
$ python3 -m pytest quantize_test.py -rP

If all tests pass, installation is successful.

Local

$ cd ~/
$ git clone https://github.com/NVIDIA/TensorRT.git
$ cd TensorRT/tools/tensorflow-quantization
$ ./install.sh
$ cd tests
$ python3 -m pytest quantize_test.py -rP

If all tests pass, installation is successful.

Documentation

TensorFlow 2.x Quantization toolkit user guide.

Known limitations

  1. Only Quantization Aware Training (QAT) is supported as a quantization method.
  2. Only Functional and Sequential Keras models are supported. Original Keras layers are wrapped into quantized layers using TensorFlow's clone_model method, which doesn't support subclassed models.
  3. Saving the quantized version of a few layers may not be supported in TensorFlow < 2.8:
    • DepthwiseConv2D support was added in TF 2.8.
    • Conv2DTranspose is not yet supported by TF (see the open bug here). However, there's a workaround if you do not need the TF2 SavedModel file and just the ONNX file:
      1. Implement Conv2DTransposeQuantizeWrapper. See our user guide for more information on how to do that.
      2. Convert the quantized Keras model to ONNX using our provided utility function convert_keras_model_to_onnx.

Resources