title: TypeError: 'dict_values' object is not subscriptable
body: <pre><code>best_params_train = dict(optimizer=optimizers[0], learning_rate=learning_rates[0],
                           cnn_train_type=cnn_train_types[0], 
                           cnn_arch=cnns_arch.values()[0],
                           dropout=dropouts[0])
  </code></pre>
  
  <p>it gives error at cnn_arch=cnns_arch.values()[0] as TypeError: 'dict_values' object is not subscriptable.
  i tried converting into list but not worked.
  how to convert the above dict(....) into list</p>
  
  <pre><code>exp_params_train = dict(optimizer=optimizers[1:], learning_rate=learning_rates[1:],
                          cnn_train_type=cnn_train_types[1:], dropout=dropouts[1:],
                          cnn_arch=cnns_arch.values())
  </code></pre>