如何在tensorflow.js中截断coco ssd模型？

import * as cocoSsd from '@tensorflow-models/coco-ssd';
import * as tf from '@tensorflow/tfjs';

const image = document.getElementById('image');
const model = await cocoSsd.load();
const predictions = await model.detect(image);

const maxNumBoxes = 10; // 设置最大边界框数目
const minScore = 0.5; // 设置最低置信度阈值

const truncatedPredictions = predictions.filter(prediction => {
  return prediction.class !== 'person' && prediction.score > minScore;
}).slice(0, maxNumBoxes);

truncatedPredictions.forEach(prediction => {
  const { class, score, bbox } = prediction;

  // 在画布上绘制边界框
  const ctx = document.getElementById('canvas').getContext('2d');
  ctx.font = '16px Arial';
  ctx.strokeStyle = '#00FFFF';
  ctx.fillStyle = '#00FFFF';
  ctx.lineWidth = 2;
  ctx.fillText(`${class}: ${Math.round(score * 100)}%`, bbox[0], bbox[1] > 10 ? bbox[1] - 5 : 10);
  ctx.rect(bbox[0], bbox[1], bbox[2], bbox[3]);
  ctx.stroke();
});