Problem with blazeface (html)

Hi, I have a problem with this code:

<!DOCTYPE html>
    <meta charset="UTF-8">
    <title>BlazeFace avec une image importée</title>
    <script src=""></script>
    <script src=""></script>

        #canvas {
          max-width: 500px;
    <input type="file" accept="image/*" onchange="detectFaces(this)">
    <p>Nombre de visages détectés : <span id="numFaces"></span></p>
    <canvas id="canvas"></canvas>
      async function detectFaces(input) {
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');
        const img = new Image();
        img.src = URL.createObjectURL(input.files[0]);
        await img.decode();
        canvas.width = img.width;
        canvas.height = img.height;
        ctx.drawImage(img, 0, 0);
        const model = await blazeface.load();
        const predictions = await model.estimateFaces(canvas);
        document.getElementById('numFaces').innerText = predictions.length;
        for (let i = 0; i < predictions.length; i++) {
          const start = predictions[i].topLeft;
          const end = predictions[i].bottomRight;
          const size = [end[0] - start[0], end[1] - start[1]];
          ctx.rect(start[0], start[1], size[0], size[1]);
          ctx.strokeStyle = 'red';
          ctx.lineWidth = 2;

BlazeFace is an ia of tensorflow.js supposed to recognize faces. But here when I put an image, it is displayed but no analysis is done.

console error (google chrome):

Uncaught (in promise) TypeError: n.loadGraphModel is not a function
    at Object.<anonymous> (blazeface:17:7074)
    at blazeface:17:1563
    at (blazeface:17:1668)
    at blazeface:17:606
    at new Promise (<anonymous>)
    at r (blazeface:17:354)
    at t.load (blazeface:17:6893)
    at detectFaces (blazeface.html:28:39)
(anonymous) @ blazeface:17
(anonymous) @ blazeface:17
(anonymous) @ blazeface:17
(anonymous) @ blazeface:17
r @ blazeface:17
t.load @ blazeface:17
detectFaces @ blazeface.html:28
await in detectFaces (async)
onchange @ blazeface.html:15

Thanks to you