title: What does a code np.mean(array_1 == array_2) do?
body: <p>What does the following code do?</p>
  
  <pre><code>import numpy as np
  np.mean(array_1 == array_2)
  </code></pre>
  
  <p>Here <code>array_1</code> and <code>array_2</code> are same shaped arrays of type <code>int</code>.</p>