title: Google Colab Pro "Your session crashed after using all available RAM" on the simplest task
body: <p>I have my data in a (93894, 8320) numpy array.  All good so far.  When I go to np.concatenate it with another array that's (93894, 1), it crashes Colab every single time, even though it's handled the larger tasks just fine.</p>
  <pre><code>model_data = np.concatenate((model_data_minus_labels, all_labels), axis=1)
  </code></pre>
  <p>I've switched to high-RAM runtime, tried switching from CPU to GPU and back, and am using Colab Pro.</p>