Great explanations about the process, so thank you for this effort @patrickvonplaten  I started the same process for trying different (also too basic) preprocessing steps. Then, I will try different hyperparams settings if Colab let me do it  Even I have Colab Pro, it generally limits my GPU connection and prevents to access it. So, if you have any suggestion about tuning hyperparameters faster or easier, I will be glad to hear.