openvino/samples/python/ngraph_function_creation_sample

nGraph Function Creation Python* Sample

This sample demonstrates how to run inference using a model built on the fly that uses weights from the LeNet classification model, which is known to work well on digit classification tasks. You do not need an XML file, the model is created from the source code on the fly.

The following Python API is used in the application:

Feature	API	Description
Model Operations	[openvino.runtime.Model], [openvino.runtime.set_batch], [openvino.runtime.Model.input]	Managing of model
nGraph Functions	[openvino.runtime.op.Parameter], [openvino.runtime.op.Constant], [openvino.runtime.opset8.convolution], [openvino.runtime.opset8.add], [openvino.runtime.opset1.max_pool], [openvino.runtime.opset8.reshape], [openvino.runtime.opset8.matmul], [openvino.runtime.opset8.relu], [openvino.runtime.opset8.softmax]	Description of a model topology using nGraph Python API

Basic OpenVINO™ Runtime API is covered by Hello Classification Python* Sample.

Options	Values
Validated Models	LeNet
Model Format	Model weights file (*.bin)
Supported devices	All
Other language realization	C++

How It Works

At startup, the sample application does the following:

• Reads command line parameters
• Build a Model and passed weights file
• Loads the model and input data to the OpenVINO™ Runtime plugin
• Performs synchronous inference and processes output data, logging each step in a standard output stream

You can see the explicit description of each sample step at Integration Steps section of "Integrate the OpenVINO™ Runtime with Your Application" guide.

Running

To run the sample, you need to specify model weights and device.

python ngraph_function_creation_sample.py <path_to_model> <device_name>

Note

:

• This sample supports models with FP32 weights only.

• The lenet.bin weights file was generated by the Model Optimizer tool from the public LeNet model with the --input_shape [64,1,28,28] parameter specified.

• The original model is available in the Caffe* repository on GitHub*.

For example:

python ngraph_function_creation_sample.py lenet.bin GPU

Sample Output

The sample application logs each step in a standard output stream and outputs 10 inference results.

[ INFO ] Creating OpenVINO Runtime Core
[ INFO ] Loading the model using ngraph function with weights from lenet.bin
[ INFO ] Loading the model to the plugin
[ INFO ] Starting inference in synchronous mode
[ INFO ] Top 1 results: 
[ INFO ] Image 0
[ INFO ]        
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 0       1.0000000   0
[ INFO ]
[ INFO ] Image 1
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 1       1.0000000   1
[ INFO ]
[ INFO ] Image 2
[ INFO ] 
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 2       1.0000000   2
[ INFO ]
[ INFO ] Image 3
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 3       1.0000000   3
[ INFO ]
[ INFO ] Image 4
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 4       1.0000000   4
[ INFO ]
[ INFO ] Image 5
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 5       1.0000000   5
[ INFO ]
[ INFO ] Image 6
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 6       1.0000000   6
[ INFO ]
[ INFO ] Image 7
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 7       1.0000000   7
[ INFO ]
[ INFO ] Image 8
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 8       1.0000000   8
[ INFO ]
[ INFO ] Image 9
[ INFO ]
[ INFO ] classid probability label
[ INFO ] -------------------------
[ INFO ] 9       1.0000000   9
[ INFO ]
[ INFO ] This sample is an API example, for any performance measurements please use the dedicated benchmark_app tool

See Also

• Integrate the OpenVINO™ Runtime with Your Application
• Using OpenVINO™ Toolkit Samples
• [Model Downloader](@ref omz_tools_downloader)
• Model Optimizer