title: BodyPix - Error: No backend found in registry
body: <p>I'm trying to setup BodyPix via the tutorial on the TensorFlow website, and I'm getting the following error</p>
  <pre><code>Uncaught (in promise) Error: No backend found in registry.
      at Engine.getSortedBackends (engine.js:248)
      at Engine.initializeBackendsAndReturnBest (engine.js:257)
      at Engine.get backend [as backend] (engine.js:94)
      at Engine.makeTensor (engine.js:556)
      at makeTensor (tensor_ops_util.js:57)
      at tensor (tensor.js:48)
      at Module.decodeWeights (io_utils.js:212)
      at GraphModel.loadSync (graph_model.js:118)
      at GraphModel.load (graph_model.js:102)
      at async loadGraphModel (graph_model.js:348)
  </code></pre>
  <p>I tried installing several packages that I thought might help, but I'm really not sure what to do now.. appreciate any input I could get.</p>
  <p><strong>package.json</strong></p>
  <pre><code>  &quot;dependencies&quot;: {
      &quot;@babel/core&quot;: &quot;^7.11.1&quot;,
      &quot;@babel/preset-env&quot;: &quot;^7.11.0&quot;,
      &quot;@tensorflow-models/body-pix&quot;: &quot;^2.0.5&quot;,
      &quot;@tensorflow/tfjs&quot;: &quot;^2.3.0&quot;,
      &quot;@tensorflow/tfjs-converter&quot;: &quot;^2.3.0&quot;,
      &quot;@tensorflow/tfjs-core&quot;: &quot;^2.3.0&quot;,
      &quot;@tensorflow/tfjs-node-gpu&quot;: &quot;^2.3.0&quot;
    },
    &quot;devDependencies&quot;: {
      &quot;babel-loader&quot;: &quot;^8.1.0&quot;,
      &quot;webpack-dev-server&quot;: &quot;^3.11.0&quot;,
      &quot;webpack&quot;: &quot;^4.44.1&quot;,
      &quot;webpack-cli&quot;: &quot;^3.3.12&quot;
    }
  </code></pre>
  <p><strong>index.js</strong></p>
  <pre><code>import * as bodyPix from '@tensorflow-models/body-pix';
  
  const img = document.getElementById('image');
  
  async function loadAndPredict() {
    const net = await bodyPix.load(/** optional arguments, see below **/);
  
    /**
     * One of (see documentation below):
     *   - net.segmentPerson
     *   - net.segmentPersonParts
     *   - net.segmentMultiPerson
     *   - net.segmentMultiPersonParts
     * See documentation below for details on each method.
     */
    const segmentation = await net.segmentPerson(img);
    console.log(segmentation);
  }
  loadAndPredict();
  </code></pre>