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Karol Blaszczak edited this page May 9, 2022 · 3 revisions

Get Started with OpenVINO™ Toolkit on Linux

This guide provides you with the information that will help you to start using the OpenVINO™ Toolkit on Linux. With this guide, you will learn how to:

  1. Configure the Model Optimizer
  2. Prepare a model for sample inference
    1. Download a pre-trained model
    2. Convert the model to an Intermediate Representation (IR) with the Model Optimizer
  3. Run the Image Classification Sample Application with the model

Prerequisites

  1. This guide assumes that you have already cloned the openvino repo and successfully built the Inference Engine and Samples using the build instructions.
  2. The original structure of the repository directories remains unchanged.

NOTE: Below, the directory to which the openvino repository is cloned is referred to as <OPENVINO_DIR>.

Configure the Model Optimizer

The Model Optimizer is a Python*-based command line tool for importing trained models from popular deep learning frameworks such as Caffe*, TensorFlow*, Apache MXNet*, ONNX* and Kaldi*.

You cannot perform inference on your trained model without having first run the model through the Model Optimizer. When you run a pre-trained model through the Model Optimizer, it outputs an Intermediate Representation, or (IR) of the network, a pair of files that describes the whole model:

  • .xml: Describes the network topology
  • .bin: Contains the weights and biases binary data

For more information about the Model Optimizer, refer to the Model Optimizer Developer Guide.

Model Optimizer Configuration Steps

You can choose to either configure all supported frameworks at once OR configure one framework at a time. Choose the option that best suits your needs. If you see error messages, check for any missing dependencies.

NOTE: The TensorFlow* framework is not officially supported on CentOS*, so the Model Optimizer for TensorFlow cannot be configured on, or run with CentOS.

IMPORTANT: Internet access is required to execute the following steps successfully. If you access the Internet via proxy server only, please make sure that it is configured in your OS environment as well.

Option 1: Configure all supported frameworks at the same time

  1. Go to the Model Optimizer prerequisites directory:
cd <OPENVINO_DIR>/model_optimizer/install_prerequisites
  1. Run the script to configure the Model Optimizer for Caffe, TensorFlow 1.x, MXNet, Kaldi*, and ONNX:
sudo ./install_prerequisites.sh

Option 2: Configure each framework separately

Configure individual frameworks separately ONLY if you did not select Option 1 above.

  1. Go to the Model Optimizer prerequisites directory:
cd <OPENVINO_DIR>/model_optimizer/install_prerequisites
  1. Run the script for your model framework. You can run more than one script:
  • For Caffe:
sudo ./install_prerequisites_caffe.sh
  • For TensorFlow 1.x:
sudo ./install_prerequisites_tf.sh
  • For TensorFlow 2.x:
sudo ./install_prerequisites_tf2.sh
  • For MXNet:
sudo ./install_prerequisites_mxnet.sh
  • For ONNX:
sudo ./install_prerequisites_onnx.sh
  • For Kaldi:
sudo ./install_prerequisites_kaldi.sh

The Model Optimizer is configured for one or more frameworks. Continue to the next session to download and prepare a model for running a sample inference.

Prepare a Model for Sample Inference

This section describes how to get a pre-trained model for sample inference and how to prepare the optimized Intermediate Representation (IR) that Inference Inference Engine uses.

Download a Trained Model

To run the Image Classification Sample, you need a pre-trained model to run the inference on. This guide uses the public SqueezeNet 1.1 Caffe model. You can find and download this model manually or use the OpenVINO™ Model Downloader.

With the Model Downloader, you can download other popular public deep learning topologies and OpenVINO™ pre-trained models, which are already prepared for running inference upon a wide list of inference scenarios:

  • object detection,
  • object recognition,
  • object re-identification,
  • human pose estimation,
  • action recognition, and others.

To download the SqueezeNet 1.1 Caffe* model to a models folder (referred to as <models_dir> below) with the Model Downloader:

  1. Install the prerequisites.
  2. Run the downloader.py script, specifying the topology name and the path to your <models_dir>. For example, to download the model to a directory named ~/public_models, run: 
    ./downloader.py --name squeezenet1.1 --output_dir ~/public_models
    When the model files are successfully downloaded, output similar to the following is printed: 
    ################|| Downloading squeezenet1.1 ||################

========== Downloading /home/user/public_models/public/squeezenet1.1/squeezenet1.1.prototxt
... 100%, 9 KB, 19621 KB/s, 0 seconds passed

========== Downloading /home/user/public_models/public/squeezenet1.1/squeezenet1.1.caffemodel
... 100%, 4834 KB, 5159 KB/s, 0 seconds passed

========== Replacing text in /home/user/public_models/public/squeezenet1.1/squeezenet1.1.prototxt

Convert the model to an Intermediate Representation with the Model Optimizer

NOTE: This section assumes that you have configured the Model Optimizer using the instructions from the Configure the Model Optimizer section.

  1. Create a <ir_dir> directory that contains the Intermediate Representation (IR) of the model.

  2. Inference Engine can perform inference on a list of supported devices using specific device plugins. Different plugins support models of different precision formats, such as FP32, FP16, INT8. To prepare an IR to run inference on particular hardware, run the Model Optimizer with the appropriate --data_type options:

    For CPU (FP32):

    python3 <OPENVINO_DIR>/model_optimizer/mo.py --input_model <models_dir>/public_models/public/squeezenet1.1/squeezenet1.1.caffemodel --data_type FP32 --output_dir <ir_dir>

    For GPU and MYRIAD (FP16):

    python3 <OPENVINO_DIR>/model_optimizer/mo.py --input_model <models_dir>/public_models/public/squeezenet1.1/squeezenet1.1.caffemodel --data_type FP16 --output_dir <ir_dir>

    After the Model Optimizer script is completed, the produced IR files (squeezenet1.1.xml, squeezenet1.1.bin) are in the specified <ir_dir> directory.

  3. Copy the squeezenet1.1.labels file from the <OPENVINO_DIR>/scripts/demo/ folder to the model IR directory. This file contains the classes that ImageNet uses so that the inference results show text instead of classification numbers:

    cp <OPENVINO_DIR>/scripts/demo/squeezenet1.1.labels <ir_dir>

Now you are ready to run the Image Classification Sample Application.

Run the Image Classification Sample Application

The Inference Engine sample applications are automatically compiled when you built the Inference Engine using the build instructions. The binary files are located in the <OPENVINO_DIR>/bin/intel64/Release directory.

To run the Image Classification sample application with an input image on the prepared IR:

  1. Go to the samples build directory:

    cd <OPENVINO_DIR>/bin/intel64/Release

  2. Run the sample executable with specifying the car.png file from the <OPENVINO_DIR>/scripts/demo/ directory as an input image, the IR of your model and a plugin for a hardware device to perform inference on:

    For CPU:

    ./classification_sample_async -i <OPENVINO_DIR>/scripts/demo/car.png -m <ir_dir>/squeezenet1.1.xml -d CPU

    For GPU:

    ./classification_sample_async -i <OPENVINO_DIR>/scripts/demo/car.png -m <ir_dir>/squeezenet1.1.xml -d GPU

    For MYRIAD:

    NOTE: Running inference on VPU devices (Intel® Movidius™ Neural Compute Stick or Intel® Neural Compute Stick 2) with the MYRIAD plugin requires performing additional hardware configuration steps.

    ./classification_sample_async -i <OPENVINO_DIR>/scripts/demo/car.png -m <ir_dir>/squeezenet1.1.xml -d MYRIAD

When the Sample Application completes, you will have the label and confidence for the top-10 categories printed on the screen. Below is a sample output with inference results on CPU:

Top 10 results:

Image ../../../scripts/demo/car.png

classid probability label
------- ----------- -----
817     0.8363342   sports car, sport car
511     0.0946487   convertible
479     0.0419130   car wheel
751     0.0091071   racer, race car, racing car
436     0.0068161   beach wagon, station wagon, wagon, estate car, beach waggon, station waggon, waggon
656     0.0037564   minivan
586     0.0025741   half track
717     0.0016069   pickup, pickup truck
864     0.0012027   tow truck, tow car, wrecker
581     0.0005882   grille, radiator grille

[ INFO ] Execution successful

[ INFO ] This sample is an API example, for any performance measurements please use the dedicated benchmark_app tool

Additional Resources

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