title: Find arrays of ndarray that are in another ndarray - Python
body: <p>I was wondering if there's any built-in method to find arrays of a ndarray that are contained into another ndarray.
  i.e.</p>
  
  <pre><code>arr1 = [[1,2], [2,9], [3,7], [5,11], [32,5], [11,4], [89,3], [37,5]]
  </code></pre>
  
  <p>and</p>
  
  <pre><code>arr2 = [[12,44], [2,9], [125,3], [37,5]]
  </code></pre>
  
  <p>I would like to know if there's any built-in method to identify that <code>[2,9]</code> and <code>[37,5]</code> are the only arrays of <code>arr2</code> contained into <code>arr1</code>. Or to identify their indexes.</p>