title: Error when trying to execute ISR Execution
body: <p>I did everything the same as usual. But this time I got this error on ISR Execution?
  I restarted, reinstalled...</p>
  <pre><code>AttributeError                            Traceback (most recent call last)
  
  &lt;ipython-input-12-627ce27cdb89&gt; in &lt;module&gt;()
        5 
        6 from ISR.models import RDN, RRDN
  ----&gt; 7 rrdn = RRDN(weights='gans')
        8 rdn = RDN(weights='noise-cancel')
        9 print(&quot;De-noising...&quot;)
  
  3 frames
  
  /usr/local/lib/python3.7/dist-packages/tensorflow_core/python/keras/saving/hdf5_format.py in load_weights_from_hdf5_group(f, layers)
      649   &quot;&quot;&quot;
      650   if 'keras_version' in f.attrs:
  --&gt; 651     original_keras_version = f.attrs['keras_version'].decode('utf8')
      652   else:
      653     original_keras_version = '1'
  
  AttributeError: 'str' object has no attribute 'decode'
  </code></pre>