dusty-nv/jetson-inference

Deploying Deep Learning

Welcome to our instructional guide for inference and realtime vision DNN library for NVIDIA Jetson devices. This project uses TensorRT to run optimized networks on GPUs from C++ or Python, and PyTorch for training models.

Supported DNN vision primitives include imageNet for image classification, detectNet for object detection, segNet for semantic segmentation, poseNet for pose estimation, and actionNet for action recognition. Examples are provided for streaming from live camera feeds, making webapps with WebRTC, and support for ROS/ROS2.

Follow the Hello AI World tutorial for running inference and transfer learning onboard your Jetson, including collecting your own datasets, training your own models with PyTorch, and deploying them with TensorRT.

Table of Contents

• Hello AI World
• Jetson AI Lab
• Video Walkthroughs
• API Reference
• Code Examples
• Pre-Trained Models
• System Requirements
• Change Log

>   JetPack 6 is now supported on Orin devices (developer.nvidia.com/jetpack)
>   Check out the Generative AI and LLM tutorials on Jetson AI Lab!
>   See the Change Log for the latest updates and new features.

Hello AI World

Hello AI World can be run completely onboard your Jetson, including live inferencing with TensorRT and transfer learning with PyTorch. For installation instructions, see System Setup. It's then recommended to start with the Inference section to familiarize yourself with the concepts, before diving into Training your own models.

System Setup

• Setting up Jetson with JetPack
• Running the Docker Container
• Building the Project from Source

Inference

• Image Classification
  • Using the ImageNet Program on Jetson
  • Coding Your Own Image Recognition Program (Python)
  • Coding Your Own Image Recognition Program (C++)
  • Running the Live Camera Recognition Demo
  • Multi-Label Classification for Image Tagging
• Object Detection
  • Detecting Objects from Images
  • Running the Live Camera Detection Demo
  • Coding Your Own Object Detection Program
  • Using TAO Detection Models
  • Object Tracking on Video
• Semantic Segmentation
  • Segmenting Images from the Command Line
  • Running the Live Camera Segmentation Demo
• Pose Estimation
• Action Recognition
• Background Removal
• Monocular Depth

Training

• Transfer Learning with PyTorch
• Classification/Recognition (ResNet-18)
  • Re-training on the Cat/Dog Dataset
  • Re-training on the PlantCLEF Dataset
  • Collecting your own Classification Datasets
• Object Detection (SSD-Mobilenet)
  • Re-training SSD-Mobilenet
  • Collecting your own Detection Datasets

WebApp Frameworks

• WebRTC Server
• HTML / JavaScript
• Flask + REST
• Plotly Dashboard
• Recognizer (Interactive Training)

Appendix

• Camera Streaming and Multimedia
• Image Manipulation with CUDA
• DNN Inference Nodes for ROS/ROS2

Jetson AI Lab

The Jetson AI Lab has additional tutorials on LLMs, Vision Transformers (ViT), and Vision Language Models (VLM) that run on Orin (and in some cases Xavier). Check out some of these:

NanoOWL - Open Vocabulary Object Detection ViT (container: nanoowl)

Live Llava on Jetson AGX Orin (container: local_llm)

Live Llava 2.0 - VILA + Multimodal NanoDB on Jetson Orin (container: local_llm)

Realtime Multimodal VectorDB on NVIDIA Jetson (container: nanodb)

Video Walkthroughs

Below are screencasts of Hello AI World that were recorded for the Jetson AI Certification course:

API Reference

Below are links to reference documentation for the C++ and Python libraries from the repo:

jetson-inference

jetson-utils

• C++
• Python

These libraries are able to be used in external projects by linking to libjetson-inference and libjetson-utils.

Code Examples

Introductory code walkthroughs of using the library are covered during these steps of the Hello AI World tutorial:

• Coding Your Own Image Recognition Program (Python)
• Coding Your Own Image Recognition Program (C++)

Additional C++ and Python samples for running the networks on images and live camera streams can be found here:

note: see the Array Interfaces section for using memory with other Python libraries (like Numpy, PyTorch, ect)

These examples will automatically be compiled while Building the Project from Source, and are able to run the pre-trained models listed below in addition to custom models provided by the user. Launch each example with --help for usage info.

Pre-Trained Models

The project comes with a number of pre-trained models that are available to use and will be automatically downloaded:

Image Recognition

Object Detection

Legacy Detection Models

Model	CLI argument	NetworkType enum	Object classes
DetectNet-COCO-Dog	coco-dog	COCO_DOG	dogs
DetectNet-COCO-Bottle	coco-bottle	COCO_BOTTLE	bottles
DetectNet-COCO-Chair	coco-chair	COCO_CHAIR	chairs
DetectNet-COCO-Airplane	coco-airplane	COCO_AIRPLANE	airplanes
ped-100	pednet	PEDNET	pedestrians
multiped-500	multiped	PEDNET_MULTI	pedestrians, luggage
facenet-120	facenet	FACENET	faces

Semantic Segmentation

• If the resolution is omitted from the CLI argument, the lowest resolution model is loaded
• Accuracy indicates the pixel classification accuracy across the model's validation dataset
• Performance is measured for GPU FP16 mode with JetPack 4.2.1, nvpmodel 0 (MAX-N)

Legacy Segmentation Models

Network	CLI Argument	NetworkType enum	Classes
Cityscapes (2048x2048)	fcn-alexnet-cityscapes-hd	FCN_ALEXNET_CITYSCAPES_HD	21
Cityscapes (1024x1024)	fcn-alexnet-cityscapes-sd	FCN_ALEXNET_CITYSCAPES_SD	21
Pascal VOC (500x356)	fcn-alexnet-pascal-voc	FCN_ALEXNET_PASCAL_VOC	21
Synthia (CVPR16)	fcn-alexnet-synthia-cvpr	FCN_ALEXNET_SYNTHIA_CVPR	14
Synthia (Summer-HD)	fcn-alexnet-synthia-summer-hd	FCN_ALEXNET_SYNTHIA_SUMMER_HD	14
Synthia (Summer-SD)	fcn-alexnet-synthia-summer-sd	FCN_ALEXNET_SYNTHIA_SUMMER_SD	14
Aerial-FPV (1280x720)	fcn-alexnet-aerial-fpv-720p	FCN_ALEXNET_AERIAL_FPV_720p	2

Pose Estimation

Action Recognition

Recommended System Requirements

• Jetson Nano Developer Kit with JetPack 4.2 or newer (Ubuntu 18.04 aarch64).
• Jetson Nano 2GB Developer Kit with JetPack 4.4.1 or newer (Ubuntu 18.04 aarch64).
• Jetson Orin Nano Developer Kit with JetPack 5.0 or newer (Ubuntu 20.04 aarch64).
• Jetson Xavier NX Developer Kit with JetPack 4.4 or newer (Ubuntu 18.04 aarch64).
• Jetson AGX Xavier Developer Kit with JetPack 4.0 or newer (Ubuntu 18.04 aarch64).
• Jetson AGX Orin Developer Kit with JetPack 5.0 or newer (Ubuntu 20.04 aarch64).
• Jetson TX2 Developer Kit with JetPack 3.0 or newer (Ubuntu 16.04 aarch64).
• Jetson TX1 Developer Kit with JetPack 2.3 or newer (Ubuntu 16.04 aarch64).

The Transfer Learning with PyTorch section of the tutorial speaks from the perspective of running PyTorch onboard Jetson for training DNNs, however the same PyTorch code can be used on a PC, server, or cloud instance with an NVIDIA discrete GPU for faster training.

Extra Resources

In this area, links and resources for deep learning are listed:

• ros_deep_learning - TensorRT inference ROS nodes
• NVIDIA AI IoT - NVIDIA Jetson GitHub repositories
• Jetson eLinux Wiki - Jetson eLinux Wiki

Two Days to a Demo (DIGITS)

note: the DIGITS/Caffe tutorial from below is deprecated. It's recommended to follow the Transfer Learning with PyTorch tutorial from Hello AI World.

Expand this section to see original DIGITS tutorial (deprecated)

The DIGITS tutorial includes training DNN's in the cloud or PC, and inference on the Jetson with TensorRT, and can take roughly two days or more depending on system setup, downloading the datasets, and the training speed of your GPU.

• DIGITS Workflow
• DIGITS System Setup
• Setting up Jetson with JetPack
• Building the Project from Source
• Classifying Images with ImageNet
  • Using the Console Program on Jetson
  • Coding Your Own Image Recognition Program
  • Running the Live Camera Recognition Demo
  • Re-Training the Network with DIGITS
  • Downloading Image Recognition Dataset
  • Customizing the Object Classes
  • Importing Classification Dataset into DIGITS
  • Creating Image Classification Model with DIGITS
  • Testing Classification Model in DIGITS
  • Downloading Model Snapshot to Jetson
  • Loading Custom Models on Jetson
• Locating Objects with DetectNet
  • Detection Data Formatting in DIGITS
  • Downloading the Detection Dataset
  • Importing the Detection Dataset into DIGITS
  • Creating DetectNet Model with DIGITS
  • Testing DetectNet Model Inference in DIGITS
  • Downloading the Detection Model to Jetson
  • DetectNet Patches for TensorRT
  • Detecting Objects from the Command Line
  • Multi-class Object Detection Models
  • Running the Live Camera Detection Demo on Jetson
• Semantic Segmentation with SegNet
  • Downloading Aerial Drone Dataset
  • Importing the Aerial Dataset into DIGITS
  • Generating Pretrained FCN-Alexnet
  • Training FCN-Alexnet with DIGITS
  • Testing Inference Model in DIGITS
  • FCN-Alexnet Patches for TensorRT
  • Running Segmentation Models on Jetson

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