title: No OpKernel was registered to support Op 'CudnnRNNCanonicalToParams' in google colab
body: <p>I am trying to train a speech recognition model with coqui.stt with transfer learning,
  whenever I run the code without the <code>--train_cudnn</code> flag its starts training without any errors over CPU,but once i use the flag <code>--train_cudnn true</code> it throws the error below</p>
  <blockquote>
  <p>tensorflow.python.framework.errors_impl.InvalidArgumentError: No OpKernel was registered to support Op 'CudnnRNNCanonicalToParams' used by node tower_0/cudnn_lstm/cudnn_lstm/CudnnRNNCanonicalToParams (defined at /local/lib/python3.7/dist-packages/tensorflow_core/python/framework/ops.py:1748) with th</p>
  </blockquote>
  <p><a href="https://i.stack.imgur.com/OcW0X.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OcW0X.png" alt="GPU details" /></a></p>
  <pre><code>!python -m coqui_stt_training.train \
  --train_cudnn true \
  --n_hidden 2048 \
  --drop_source_layers 3 \
  --alphabet_config_path /content/drive/MyDrive/finalDatasetSTT/finalDatasetSTT/alphabet.txt \
  --save_checkpoint_dir /content/drive/MyDrive/checkpoints \
  --load_checkpoint_dir /content/drive/MyDrive/pretrained_checkpoint \
  --train_files /content/drive/MyDrive/finalDatasetSTT/finalDatasetSTT/train.csv \
  --dev_files   /content/drive/MyDrive/finalDatasetSTT/finalDatasetSTT/dev.csv \
  --test_files  /content/drive/MyDrive/finalDatasetSTT/finalDatasetSTT/test.csv \
  </code></pre>