title: Most efficient way to reverse a numpy array
body: <p>Believe it or not, after profiling my current code, the repetitive operation of numpy array reversion ate a giant chunk of the running time. What I have right now is the common view-based method:</p>
  <pre><code>reversed_arr = arr[::-1]
  </code></pre>
  <p>Is there any other way to do it more efficiently, or is it just an illusion from my obsession with unrealistic numpy performance?</p>