NonStreamingDecodeFileTransducerHotwords.java
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// Copyright 2024 Xiaomi Corporation
// This file shows how to use an offline transducer, i.e., non-streaming transducer,
// to decode files with hotwords support.
//
// See also
// https://k2-fsa.github.io/sherpa/onnx/hotwords/index.html#modeling-unit-is-cjkchar
import com.k2fsa.sherpa.onnx.*;
public class NonStreamingDecodeFileTransducerHotwords {
public static void main(String[] args) {
// please refer to
// https://k2-fsa.github.io/sherpa/onnx/hotwords/index.html#modeling-unit-is-cjkchar
// to download model files
String encoder =
"./sherpa-onnx-conformer-zh-stateless2-2023-05-23/encoder-epoch-99-avg-1.int8.onnx";
String decoder = "./sherpa-onnx-conformer-zh-stateless2-2023-05-23/decoder-epoch-99-avg-1.onnx";
String joiner = "./sherpa-onnx-conformer-zh-stateless2-2023-05-23/joiner-epoch-99-avg-1.onnx";
String tokens = "./sherpa-onnx-conformer-zh-stateless2-2023-05-23/tokens.txt";
String waveFilename = "./sherpa-onnx-conformer-zh-stateless2-2023-05-23/test_wavs/6.wav";
WaveReader reader = new WaveReader(waveFilename);
OfflineTransducerModelConfig transducer =
OfflineTransducerModelConfig.builder()
.setEncoder(encoder)
.setDecoder(decoder)
.setJoiner(joiner)
.build();
OfflineModelConfig modelConfig =
OfflineModelConfig.builder()
.setTransducer(transducer)
.setTokens(tokens)
.setNumThreads(1)
.setDebug(true)
.setModelingUnit("cjkchar")
.build();
OfflineRecognizerConfig config =
OfflineRecognizerConfig.builder()
.setOfflineModelConfig(modelConfig)
.setDecodingMethod("modified_beam_search")
.setHotwordsFile("./hotwords_cn.txt")
.setHotwordsScore(2.0f)
.build();
OfflineRecognizer recognizer = new OfflineRecognizer(config);
OfflineStream stream = recognizer.createStream();
stream.acceptWaveform(reader.getSamples(), reader.getSampleRate());
recognizer.decode(stream);
String text = recognizer.getResult(stream).getText();
System.out.printf("filename:%s\nresult:%s\n", waveFilename, text);
stream.release();
recognizer.release();
}
}