VADModule

TypeScript API implementation of the useVAD hook.

Reference

import { VADModule, FSMN_VAD } from 'react-native-executorch';

const model = new VADModule();
await model.load(FSMN_VAD, (progress) => {
  console.log(progress);
});

await model.forward(waveform);

Methods

Method	Type	Description
load	(model: { modelSource: ResourceSource }, onDownloadProgressCallback?: (progress: number) => void): Promise<void>	Loads the model, where modelSource is a string that specifies the location of the model binary. To track the download progress, supply a callback function onDownloadProgressCallback.
forward	(waveform: Float32Array): Promise<{ [category: string]: number }>	Executes the model's forward pass, where imageSource can be a fetchable resource or a Base64-encoded string.
delete	(): void	Release the memory held by the module. Calling forward afterwards is invalid.

Type definitions

type ResourceSource = string | number | object;

interface Segment {
  start: number;
  end: number;
}

Loading the model

To load the model, create a new instance of the module and use the load method on it. It accepts an object:

model - Object containing the model source.

• modelSource - A string that specifies the location of the model binary.

onDownloadProgressCallback - (Optional) Function called on download progress.

This method returns a promise, which can resolve to an error or void.

For more information on loading resources, take a look at loading models page.

Running the model

To run the model, you can use the forward method on the module object. Before running the model's forward method, make sure to extract the audio waveform you want to process. You'll need to handle this step yourself, ensuring the audio is sampled at 16 kHz. Once you have the waveform, pass it as an argument to the forward method. The method returns a promise that resolves to the array of detected speech segments.

Managing memory

The module is a regular JavaScript object, and as such its lifespan will be managed by the garbage collector. In most cases this should be enough, and you should not worry about freeing the memory of the module yourself, but in some cases you may want to release the memory occupied by the module before the garbage collector steps in. In this case use the method delete() on the module object you will no longer use, and want to remove from the memory. Note that you cannot use forward after delete unless you load the module again.