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Generate CUDA ROS and CUDA ROS 2 Nodes Using MATLAB Coder and GPU Coder

Configure MATLAB® Coder™ software to generate and build CUDA® ROS and CUDA® ROS 2 nodes from a MATLAB function. You can deploy the CUDA nodes to local or remote GPU target devices.

In this example, you will deploy MobileNet-v2 object detection algorithm on a local host computer with a supported NVIDIA graphics card.

Begin by creating a ROS publisher to publish the ROS image and run prediction on it using MobileNet-v2 object detection algorithm. You then generate a local host node to deploy the object detection algorithm on a local host computer with a CUDA-enabled NVIDIA GPU. Finally, you create a ROS subscriber to plot the top five prediction scores.

Prerequisites

1. Install and set up these MathWorks® products and support packages: MATLAB® Coder™ (required), Embedded Coder® (recommended), GPU Coder™, and GPU Coder Interface for Deep Learning Libraries (required for Deep Learning).

Note: GPU Coder™ is supported only on Windows and Linux.

2. You can also install MATLAB® Coder™ Support Package for NVIDIA® Jetson™ and NVIDIA DRIVE™ Platforms (required for an NVIDIA hardware connection).

3. Your target device can be a local host computer with a CUDA-enabled NVIDIA GPU, or a remote device such as an NVIDIA Jetson board.

4. To use GPU Coder for CUDA code generation, you must install NVIDIA graphics driver, CUDA toolkit, cuDNN library, and TensorRT library. For more information on local host deployment and host simulation, see Installing Prerequisite Products (GPU Coder).

5. To set up the environment variables, see Setting Up the Prerequisite Products (GPU Coder).

6. To ensure you have the required third-party software, see ROS Toolbox System Requirements.

Verify GPU Environment for GPU Code Generation

To verify that your development computer has the drivers, tools, libraries, and configuration required for GPU code generation, see Setting Up the Prerequisite Products (GPU Coder).

Create a coder.checkGpuInstall (GPU Coder) object and set its property values. Then, verify your GPU code generation environment using the coder.checkGpuInstall (GPU Coder) function.

gpuEnvObj = coder.gpuEnvConfig;
gpuEnvObj.BasicCodegen = 1;
gpuEnvObj.BasicCodeexec = 1;
gpuEnvObj.DeepLibTarget = "tensorrt";
gpuEnvObj.DeepCodeexec = 1;
gpuEnvObj.DeepCodegen = 1;
results = coder.checkGpuInstall(gpuEnvObj)

The output is representative. Results might differ from user to user.

Compatible GPU           : PASSED 
CUDA Environment         : PASSED 
	Runtime   : PASSED 
	cuFFT     : PASSED 
	cuSOLVER  : PASSED 
	cuBLAS    : PASSED 
cuDNN Environment        : PASSED 
TensorRT Environment     : PASSED 
Basic Code Generation    : PASSED 
Basic Code Execution     : PASSED 
Deep Learning (TensorRT) Code Generation: PASSED 
Deep Learning (TensorRT) Code Execution: PASSED 

results = 

  struct with fields:

                 gpu: 1
                cuda: 1
               cudnn: 1
            tensorrt: 1
        basiccodegen: 1
       basiccodeexec: 1
         deepcodegen: 1
        deepcodeexec: 1
    tensorrtdatatype: 1
           profiling: 0

Configure MATLAB Coder for CUDA ROS Node Generation

Initialize ROS Core and Global Node.

rosinit
Launching ROS Core...
.Done in 1.1242 seconds.
Initializing ROS master on http://172.18.226.60:11311.
Initializing global node /matlab_global_node_73382 with NodeURI http://hyd-jkonakal:49931/ and MasterURI http://localhost:11311.

Create MATLAB Function for Deep Learning

Write a MATLAB function to subscribe to the image and apply MobileNet-v2 algorithm to analyze the probability of pepper.

type('mobilenet_ros1node_predictor.m')
function mobilenet_ros1node_predictor
% Copyright 2022 The MathWorks, Inc.
%#codegen

% Create an image subscriber
imgSub = rossubscriber("/image_topic","sensor_msgs/Image","DataFormat","struct");

% Create a scores results publisher
scoresPub = rospublisher('/score_results','std_msgs/Float32MultiArray',...
    'DataFormat','struct');
scoresMsg = rosmessage("std_msgs/Float32MultiArray", "DataFormat","struct");

% Create a index results publisher
indexPub = rospublisher('/index_results','std_msgs/Float32MultiArray',...
    'DataFormat','struct');
indexMsg = rosmessage("std_msgs/Float32MultiArray", "DataFormat","struct");

upperImageSize = [224,224,3];
in = zeros(upperImageSize,'uint8');

r = rosrate(30);
reset(r);

while (1)
    receivedImage = imgSub.LatestMessage;
    while ~isempty(receivedImage) && ~isempty(receivedImage.Data)
        imageData = rosReadImage(receivedImage,"Encoding","rgb8");
        % Crop the received image if it exceeds the upper size
        imgSize = size(imageData);
        index = min(imgSize,upperImageSize);
        in(1:index(1),1:index(2),1:index(3)) = imageData(1:index(1),1:index(2),1:index(3));

        % pass image to mobilenetv2_predict network
        predict_scores = mobilenetv2_predict(in);
        [scores,indexes] = sort(predict_scores, 'descend');

        scoresMsg.Data = zeros(1000,1,'single');
        indexMsg.Data = zeros(1000,1,'single');
        
        if ~isempty(scores)
            scoresMsg.Data = single(scores');
            indexMsg.Data = single(indexes');
        end

        send(scoresPub,scoresMsg);
        send(indexPub,indexMsg);
    end
    waitfor(r);
end
end

Generate Local Host Node

Configure MATLAB Code Generation config object settings and generate local host node.

cfg = coder.config("exe");

Select the ROS version.

cfg.Hardware = coder.hardware("Robot Operating System (ROS)");

Select Localhost to deploy the object detection algorithm on a local host computer with a CUDA-enabled NVIDIA GPU.

NOTE: Select Remote Hardware to deploy the object detection algorithm on a remote target device such as NVIDIA Jetson board.

cfg.Hardware.DeployTo = "Localhost";
cfg.Hardware.BuildAction = "Build and run";
cfg.HardwareImplementation.ProdHWDeviceType = "Intel->x86-64 (Windows64)";
cfg.HardwareImplementation.ProdLongLongMode = true; % Use 'long long' for Int64 or Uint64 data types

Create the GpuCodeConfig object and enable it.

cfg.GpuConfig = coder.GpuCodeConfig;
cfg.GpuConfig.Enabled = true;

Create a DeepLearningConfig object and select the appropriate DNN library.

cfg.DeepLearningConfig = coder.DeepLearningConfig('cudnn');
codegen mobilenet_ros1node_predictor -config cfg
Warning: Generation of C++ classes for MATLAB classes is not supported by GPU Coder. Disabling this option for GPU code generation.
---
Running ROS node.
Warning: Function 'mobilenet_ros1node_predictor' does not terminate due to an infinite loop.

Warning in ==> mobilenet_ros1node_predictor Line: 50 Column: 1
Code generation successful (with warnings): View report

When codegen is successful, it creates a ROS node /mobilenet_ros1node_predictor on your local machine. You can verify the successful creation of the node by using rosnode list.

rosnode list
/matlab_global_node_73382
/mobilenet_ros1node_predictor

Create a publisher to read the ROS image and publish it to the /image_topic.

publishpepperimage

Visualize Probability Data

Subscribe to the topic and plot the top five prediction scores.

visualizepredictiondata

Configure MATLAB Coder for CUDA ROS 2 Node Generation

To generate a CUDA ROS 2 node, follow the same steps that you used to generate a CUDA ROS node. Replace all ROS functions with corresponding ROS 2 functions and configure the config object settings for executable code.

cfg = coder.config("exe");

Select the ROS version.

cfg.Hardware = coder.hardware("Robot Operating System 2 (ROS 2)");

Select Localhost to deploy the object detection algorithm on a local host computer with a CUDA-enabled NVIDIA GPU.

NOTE: Select Remote Hardware to deploy the object detection algorithm on a remote target device such as NVIDIA Jetson board.

cfg.Hardware.DeployTo = "Localhost";
cfg.Hardware.BuildAction = "Build and run";
cfg.HardwareImplementation.ProdHWDeviceType = "Intel->x86-64 (Windows64)";
cfg.HardwareImplementation.ProdLongLongMode = true; % Use 'long long' for Int64 or Uint64 data types

Create the GpuCodeConfig object and enable it.

cfg.GpuConfig = coder.GpuCodeConfig;
cfg.GpuConfig.Enabled = true;

Create a DeepLearningConfig object and select the appropriate DNN library.

cfg.DeepLearningConfig = coder.DeepLearningConfig('cudnn');

Limitations

The build folder path cannot contain any spaces.

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