写nodejs代码,用TensorFlow搭建一个语音识别模型
时间: 2024-01-28 13:03:10 浏览: 21
以下是一个用TensorFlow.js搭建语音识别模型的示例代码,你可以在Node.js环境下运行:
```javascript
const tf = require('@tensorflow/tfjs-node');
const fs = require('fs');
const wav = require('wav');
const buffer = require('buffer');
// 定义模型参数
const NUM_FRAMES = 43;
const NUM_MFCC = 13;
const MODEL_PATH = 'file://./model.json';
// 加载模型
async function loadModel() {
const model = await tf.loadLayersModel(MODEL_PATH);
return model;
}
// 对输入的语音信号进行MFCC特征提取
function extractFeatures(signal) {
const frameSize = 512;
const frameStep = 256;
const fftSize = 512;
const melCount = 40;
const mfccCount = 13;
const melFilterbank = tf.signal.linearToMelWeightMatrix(melCount, fftSize);
const spectrogram = tf.signal.stft(signal, frameSize, frameStep, fftSize);
const energy = tf.square(spectrogram).sum(axis=1, keepdims=true);
const melSpectrogram = tf.matMul(melFilterbank, spectrogram);
const logMelSpectrogram = tf.log(melSpectrogram.add(1e-6));
const dctCoefficients = tf.signal.mfccsFromLogMelSpectrogram(logMelSpectrogram);
return dctCoefficients.slice(0, NUM_FRAMES, 0, NUM_MFCC);
}
// 读取wav文件
function readWavFile(filePath) {
const file = fs.createReadStream(filePath, { highWaterMark: 1024 * 1024 });
const reader = new wav.Reader();
return new Promise((resolve, reject) => {
reader.on('format', (format) => {
const buffer = [];
reader.on('data', (data) => buffer.push(data));
reader.on('end', () => resolve(tf.tensor(buffer.flat()).div(32768)));
});
reader.on('error', (error) => reject(error));
file.pipe(reader);
});
}
// 对输入的语音信号进行识别
async function recognize(filePath) {
const model = await loadModel();
const signal = await readWavFile(filePath);
const features = extractFeatures(signal);
const scores = model.predict(features.expandDims()).squeeze();
const labelIndex = scores.argMax().arraySync();
return labelIndex;
}
// 识别样例wav文件
recognize('sample.wav').then((labelIndex) => {
console.log(`The predicted label is ${labelIndex}`);
}).catch((error) => {
console.error(error);
});
```
以上代码中,我们首先定义了模型参数和模型路径,然后使用`tfjs-node`模块加载模型。接着定义了一个`extractFeatures`函数,对输入的语音信号进行MFCC特征提取。在`readWavFile`函数中,我们使用`wav`模块读取wav文件,并将其转换为TensorFlow张量。最后,在`recognize`函数中,我们将输入的语音信号进行MFCC特征提取,并将其输入到模型中进行识别,最后输出预测结果。
注意,以上代码仅为示例代码,实际使用时需要根据实际情况进行修改和调整。