title: How to get an output/log from model.fit() while it's busy training
body: <p>I am new to Tensorflow.js.</p>
  
  <p>Coming from Keres, I am used to getting a default log like this printed during training:</p>
  
  <pre><code>Epoch 1/2
  320/320 [==============================] - 7s 21ms/step - loss: 5.6595
  Epoch 2/2
  320/320 [==============================] - 5s 15ms/step - loss: 5.5646
  </code></pre>
  
  <p>However, when I run <code>await model.fit()</code> in Tensorflow.js, my console just hangs with no output. Is there a setting I can pass to <code>model.fit()</code> so that I can output some sort of rudimentary log to the console during training?</p>