async loadModel() {
    console.log('Loading model...');
    const startTime = performance.now();
    try {
      this.model = await mobilenet.load({ version: 2, alpha: 1.00 });
      // Warms up the model by causing intermediate tensor values
      // to be built and pushed to GPU.
      tf.tidy(() => {
        this.model.classify(tf.zeros([1, IMAGE_SIZE, IMAGE_SIZE, 3]));
      });
      const totalTime = Math.floor(performance.now() - startTime);
      console.log(`Model loaded and initialized in ${totalTime} ms...`);
    } catch (e) {
      console.error('Unable to load model', e);
    }
  }
Loads mobilenet from URL and keeps a reference to it in the object.