title: Calculate Cosine Similarity of all pairs in a column on a large data frame
body: <p>As show below my dataframe contains the following column</p>
  
  <p><a href="https://i.stack.imgur.com/XJmUg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XJmUg.png" alt="enter image description here"></a>
  I am intending to calculate a user-user cosine similarity matrix for all users. </p>
  
  <p>Total Users: 75541 hence Total User Pair: 2853183570</p>
  
  <p>I can do it in a .apply() method but it would take a lot of time. Is there a technique to do it in a faster way?</p>