title: No module named 'config' and No module named 'model' in GoogleColab
body: <p>I tried to import in Colab, but it does not mention the name of a module.</p>
  
  <pre><code>from config import Config
  from model import CSRNet
  </code></pre>
  
  <p>I am writing this code and as a result I get it. </p>
  
  <pre><code>ModuleNotFoundError: No module named 'config'
  
  ModuleNotFoundError: No module named 'model'
  </code></pre>
  
  <p>How do I fix this problem?</p>