title: Error when loading tensorflow.js with node.js
body: <p>I am fairly new to javascript. I am working through the <a href="https://js.tensorflow.org/index.html#getting-started" rel="nofollow noreferrer">tensorflow-js tutorial</a> on using tensorflow-js with node.js however when I run the example code:</p>
  
  <pre><code>const tf = require('@tensorflow/tfjs');
  
  // Load the binding:
  require('@tensorflow/tfjs-node');  // Use '@tensorflow/tfjs-node-gpu' if running with GPU.
  
  // Train a simple model:
  const model = tf.sequential();
  model.add(tf.layers.dense({units: 100, activation: 'relu', inputShape: [10]}));
  model.add(tf.layers.dense({units: 1, activation: 'linear'}));
  model.compile({optimizer: 'sgd', loss: 'meanSquaredError'});
  
  const xs = tf.randomNormal([100, 10]);
  const ys = tf.randomNormal([100, 1]);
  
  model.fit(xs, ys, {
    epochs: 100,
    callbacks: {
      onEpochEnd: async (epoch, log) =&gt; {
        console.log(`Epoch ${epoch}: loss = ${log.loss}`);
      }
    }
  });
  </code></pre>
  
  <p>I have already installed the tensorflowjs package:
      npm install @tensorflow/tfjs-node-gpu</p>
  
  <p>However I get the error:</p>
  
  <pre><code>module.js:549
  throw err;
  Error: Cannot find module '@tensorflow/tfjs-node'
  </code></pre>
  
  <p>I am not sure what is causing this error.</p>