我正在尝试使用expo项目中的tensorflow.js库构建简单的机器学习模型。在代码沙箱中运行相同的代码不会产生任何错误。通过在Visual Studio代码中运行，它也会给出未定义的信息，历史和日志错误。我的代码附在下面：

import React from 'react';
import {View,Text,StyleSheet} from 'react-native';
import * as tf from '@tensorflow/tfjs';
import '@tensorflow/tfjs-react-native';

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isTfReady: false,};
  }

  init() {
    const model = tf.sequential({
        layers: [
            tf.layers.dense({
                inputShape: [784],units: 32,activation: "relu"
            }),tf.layers.dense({
                units: 10,activation: "softmax"
            })
        ]
    });
    model.weights.forEach(w => {
        console.log(w.name,w.shape);
    });
    model.weights.forEach(w => {
        const newVals = tf.randomNormal(w.shape);
        // w.val is an instance of tf.Variable
        w.val.assign(newVals);
    });
    model.compile({
        optimizer: "sgd",loss: "categoricalCrossentropy",metrics: ["accuracy"]
    });
    const data = tf.randomNormal([100,784]);
    const labels = tf.randomUniform([100,10]);

    function onBatchEnd(batch,logs) {
      logs.acc = parseFloat((logs.acc * 100).toFixed(2));
      logs.loss = parseFloat((logs.loss * 100).toFixed(3));

        console.log("accuracy",logs.acc);
    }

    // Train for 5 epochs with batch size of 32.
    model
        .fit(data,labels,{
            epochs: 5,batchSize: 32,callbacks: {
                onBatchEnd
            }
        })
        .then(info => {
            console.log("Final accuracy",info.history.acc);
        });
  }

  async componentDidmount() {
    // Wait for tf to be ready.
    await tf.ready();
    // Signal to the app that tensorflow.js can now be used.
    this.setState({
      isTfReady: true,});
  }


  render() {
    //this.init()
    // //
    return (


      <View style={styles.buttonContainer}>

            <Text>{'Final accuracy',info.history.acc}</Text>

      </View>
    )
  }
}
const styles = StyleSheet.create({
  // container: {
  //   flex: 1,// },buttonContainer: {
   // flexDirection: 'row',alignItems: 'center',marginTop: 50,},})

错误消息是：

  

找不到变量信息