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NanoDetPlus C++ Deployment Example

This directory provides examples that infer.cc fast finishes the deployment of NanoDetPlus on CPU/GPU and GPU accelerated by TensorRT.

Before deployment, two steps require confirmation

Taking the CPU inference on Linux as an example, the compilation test can be completed by executing the following command in this directory. FastDeploy version 0.7.0 or above (x.x.x>=0.7.0) is required to support this model.

mkdir build
cd build
# Download the FastDeploy precompiled library. Users can choose your appropriate version in the `FastDeploy Precompiled Library` mentioned above 
wget https://bj.bcebos.com/fastdeploy/release/cpp/fastdeploy-linux-x64-x.x.x.tgz
tar xvf fastdeploy-linux-x64-x.x.x.tgz
cmake .. -DFASTDEPLOY_INSTALL_DIR=${PWD}/fastdeploy-linux-x64-x.x.x
make -j

# Download the official converted NanoDetPlus model files and test images 
wget https://bj.bcebos.com/paddlehub/fastdeploy/nanodet-plus-m_320.onnx
wget https://gitee.com/paddlepaddle/PaddleDetection/raw/release/2.4/demo/000000014439.jpg


# CPU inference
./infer_demo nanodet-plus-m_320.onnx 000000014439.jpg 0
# GPU inference
./infer_demo nanodet-plus-m_320.onnx 000000014439.jpg 1
# TensorRT inference on GPU
./infer_demo nanodet-plus-m_320.onnx 000000014439.jpg 2

The visualized result after running is as follows

The above command works for Linux or MacOS. For SDK use-pattern in Windows, refer to:

NanoDetPlus C++ Interface

NanoDetPlus Class

fastdeploy::vision::detection::NanoDetPlus(
        const string& model_file,
        const string& params_file = "",
        const RuntimeOption& runtime_option = RuntimeOption(),
        const ModelFormat& model_format = ModelFormat::ONNX)

NanoDetPlus model loading and initialization, among which model_file is the exported ONNX model format

Parameter

  • model_file(str): Model file path
  • params_file(str): Parameter file path. Merely passing an empty string when the model is in ONNX format
  • runtime_option(RuntimeOption): Backend inference configuration. None by default, which is the default configuration
  • model_format(ModelFormat): Model format. ONNX format by default

Predict Function

NanoDetPlus::Predict(cv::Mat* im, DetectionResult* result,
                float conf_threshold = 0.25,
                float nms_iou_threshold = 0.5)

Model prediction interface. Input images and output detection results.

Parameter

  • im: Input images in HWC or BGR format
  • result: Detection results, including detection box and confidence of each box. Refer to Vision Model Prediction Results for DetectionResult
  • conf_threshold: Filtering threshold of detection box confidence
  • nms_iou_threshold: iou threshold during NMS processing

Class Member Variable

Pre-processing Parameter

Users can modify the following pre-processing parameters to their needs, which affects the final inference and deployment results

  • size(vector<int>): This parameter changes the size of the resize used during preprocessing, containing two integer elements for [width, height] with default value [320, 320]
  • padding_value(vector<float>): This parameter is used to change the padding value of images during resize, containing three floating-point elements that represent the value of three channels. Default value [0, 0, 0]
  • keep_ratio(bool): Whether to keep the aspect ratio unchanged during resize. Default fasle
  • reg_max(int): The reg_max parameter in GFL regression. Default 7
  • downsample_strides(vector<int>): This parameter is used to change the down-sampling multiple of the feature map that generates anchor, containing three integer elements that represent the default down-sampling multiple for generating anchor. Default value [8, 16, 32, 64]