• Sample projects to use TensorRT in C++ for multi-platform
• Typical project structure is like the following diagram
  • 

• Platform
  • Linux (x64)
  • Linux (aarch64)
  • Windows (x64). Visual Studio 2019

./main [input]

 - input = blank
    - use the default image file set in source code (main.cpp)
    - e.g. ./main
 - input = *.mp4, *.avi, *.webm
    - use video file
    - e.g. ./main test.mp4
 - input = *.jpg, *.png, *.bmp
    - use image file
    - e.g. ./main test.jpg
 - input = number (e.g. 0, 1, 2, ...)
    - use camera
    - e.g. ./main 0
- input = jetson
    - use camera via gstreamer on Jetson
    - e.g. ./main jetson

• OpenCV 4.x
• CUDA + cuDNN
• TensorRT 8.x
  • In case you have build errors related to TensorRT location, modify cmake settings for it in InferenceHelper/inference_helper/CMakeLists.txt

• Download source code and pre-built libraries

  git clone https://github.com/iwatake2222/play_with_tensorrt.git
  cd play_with_tensorrt
  git submodule update --init
  sh InferenceHelper/third_party/download_prebuilt_libraries.sh

• Download models

  sh ./download_resource.sh

• Build and run

  cd pj_tensorrt_cls_mobilenet_v2   # for example
  mkdir -p build && cd build
  cmake ..
  make
  ./main

• Configure and Generate a new project using cmake-gui for Visual Studio 2019 64-bit
  • Where is the source code : path-to-play_with_tensorrt/pj_tensorrt_cls_mobilenet_v2 (for example)
  • Where to build the binaries : path-to-build (any)
• Open main.sln
• Set main project as a startup project, then build and run!

You don't need to change any configuration for TensorRT, but you can change it if you want.

• The model file name is specified in xxx_engine.cpp . Please find MODEL_NAME definition
• inference_helper_tensorrt.cpp automatically converts model according to the model format (extension)
  • .onnx : convert the model from onnx to trt, and save the converted trt model
  • .uff : convert the model from uff to trt, and save the converted trt model (WIP)
  • .trt : use pre-converted trt model
• If *.trt file exists, InferenceHelper will use it to avoid re-conversion to save time
  • If you want to re-convert (for example, when you try another conversion settings), please delete resource/model/*.trt
  • Also, if you want to re-convert with INT8 calibration, please delete CalibrationTable_cal.txt

• GPU is used by default
• Call SetDlaCore(0) or SetDlaCore(1) to use DLA

• The parameters for model conversion is defiend in inference_helper_tensorrt.cpp
• USE_FP16
  • define this for FP16 inference
• USE_INT8_WITHOUT_CALIBRATION
  • define this for INT8 inference without calibration (I can't get good result with this)
• USE_INT8_WITH_CALIBRATION
  • define this for INT8 inference (you also need int8 calibration)
• OPT_MAX_WORK_SPACE_SIZE
  • 1 << 30
• OPT_AVG_TIMING_ITERATIONS
  • not in use
• OPT_MIN_TIMING_ITERATIONS
  • not in use
• Parameters for Quantization Calibration
  • CAL_DIR
    • directory containing calibration images (ppm in the same size as model input size)
  • CAL_LIST_FILE
    • text file listing calibration images (filename only. no extension)
  • CAL_BATCH_SIZE
    • batch size for calibration
  • CAL_NB_BATCHES
    • the number of batches
  • CAL_IMAGE_C
    • the channel of calibration image. must be the same as model
  • CAL_IMAGE_H
    • the height of calibration image. must be the same as model
  • CAL_IMAGE_W
    • the width of calibration image. must be the same as model
  • CAL_SCALE
    • normalize parameter for calibration (probably, should use the same value as trainig)
  • CAL_BIAS
    • normalize parameter for calibration (probably, should use the same value as trainig)

• If you want to use int8 mode, you need calibration step

1. Create ppm images whose size is the same as model input size from training images
   • you can use inference_helper/tensorrt/calibration/batchPrepare.py
   • python .\batchPrepare.py --inDir sample_org --outDir sample_ppm
2. Copy the generated ppm files and list.txt to the target environment such as Jetson
3. Use .onnx model
4. Modify parameters for calibration such as CAL_DIR and define USE_INT8
5. Compile the project and run it
6. If it succeeds, trt model file is generated. You can use it after that

• Install TensorRT in Windows
  • cuDNN installation
    • Copy all files into CUDA directory
  • TensorRT installation
    • Copy all files into CUDA directory
    • Or, set environment variable(TensorRT_ROOT = C:\Program Files\NVIDIA GPU Computing Toolkit\TensorRT\TensorRT-8.2.0.6), and add %TensorRT_ROOT%\lib to path

• Copyright 2020 iwatake2222
• Licensed under the Apache License, Version 2.0
  • LICENSE

• This project utilizes OSS (Open Source Software)
  • NOTICE.md
• Some images are retrieved from the followings:
  • dashcam_00.jpg, dashcam_01.jpg (Copyright Dashcam Roadshow 2020. https://www.youtube.com/watch?v=tTuUjnISt9s )