Sound Classification Python* Demo

Demo application for sound classification algorithm.

How It Works

On startup the demo application reads command line parameters and loads a network to Inference engine. It uses only audio files in wav format. Audio should be converted to model's sample rate using -sr/--sample_rate option, if sample rate of audio differs from sample rate of model (e.g. AclNet expected 16kHz audio). After reading the audio, it is sliced into clips to fit model input (clips are allowed to overlap with -ol/--overlap option) and each clip is processed separately with its own prediction.

Preparing to Run

For demo input image or video files, refer to the section Media Files Available for Demos in the Open Model Zoo Demos Overview. The list of models supported by the demo is in <omz_dir>/demos/sound_classification_demo/python/models.lst file. This file can be used as a parameter for Model Downloader and Converter to download and, if necessary, convert models to OpenVINO Inference Engine format (*.xml + *.bin).

An example of using the Model Downloader:

python3 <omz_dir>/tools/downloader/downloader.py --list models.lst

An example of using the Model Converter:

python3 <omz_dir>/tools/downloader/converter.py --list models.lst

Supported Models

  • aclnet
  • aclnet-int8

NOTE: Refer to the tables Intel's Pre-Trained Models Device Support and Public Pre-Trained Models Device Support for the details on models inference support at different devices.

Running

Run the application with the -h option to see the usage message:

usage: sound_classification_demo.py [-h] -i INPUT -m MODEL [-l CPU_EXTENSION]
[-d DEVICE] [--labels LABELS]
[-sr SAMPLE_RATE] [-ol OVERLAP]
Options:
-h, --help Show this help message and exit.
-i INPUT, --input INPUT
Required. Input to process
-m MODEL, --model MODEL
Required. Path to an .xml file with a trained model.
-l CPU_EXTENSION, --cpu_extension CPU_EXTENSION
Optional. Required for CPU custom layers. Absolute
path to a shared library with the kernels
implementations.
-d DEVICE, --device DEVICE
Optional. Specify the target device to infer on; CPU,
GPU, HDDL or MYRIAD is acceptable. The demo
will look for a suitable plugin for device specified.
Default value is CPU
--labels LABELS Optional. Labels mapping file
-sr SAMPLE_RATE, --sample_rate SAMPLE_RATE
Optional. Set sample rate for audio input
-ol OVERLAP, --overlap OVERLAP
Optional. Set the overlapping between audio clip in
samples or percent

Running the application with the empty list of options yields the usage message given above and an error message.

You can use the following command to do inference on GPU with a pre-trained sound classification model and conversion of input audio to sample rate of 16000:

python3 sound_classification_demo.py -i <path_to_wav>/input_audio.wav -m <path_to_model>/aclnet.xml -d GPU --sample_rate 16000

Demo Output

The demo uses console to display the predictions. It shows classification of each clip with timing of it and total prediction of whole audio.

See Also