title: Attempted relative import with no known parent package
body: <pre><code>from ..box_utils import decode, nms
  </code></pre>
  
  <p>This line is giving <strong>error</strong></p>
  
  <blockquote>
    <p>ImportError: <em>attempted relative import with no known parent package</em></p>
  </blockquote>
  
  <p>What is this error and how to resolve this error?</p>