title: Multiplying the matrix via its transpose using numpy
body: <p>I am trying to multiply X by its transpose:</p>
  
  <p><a href="https://i.stack.imgur.com/gp7Ou.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gp7Ou.png" alt="enter image description here"></a></p>
  
  <p>I am bit puzzled by the fact that <code>X</code> is an <code>np.array</code> of <code>list</code>'s.</p>