Ali Fathi

Hello, I was working with shell_gpt then I realized that when I want to use it locally it asks for openai api key. this PR resolve that asking, if user...

This PR adds a TensorFlow implementation of the Parallel WaveGAN generator model. Additionally, a conditional statement has been added to `generic_utils.py` to create an instance of the model.

I have faced an issue when I wanted to use `tts-mb_melgan-thorsten-ger` model. tacotron config didn't recognize the thorsten data set and couldn't set self.vocab_size