Cannot run Fastpitch on CPU
Hi, I ran the code at tutorials/tts/FastPitch_MixerTTS_Training.ipynb and received the error as following when run python fastpitch.py
![image](https://user-images.githubusercontent.com/73210249/177138773-df77f68c-c910-445e-8ba9-f0bbf08358a1.png)

I change config file to run on CPU 
![image](https://user-images.githubusercontent.com/73210249/177235371-3ecf1e17-2963-4e20-b95e-060ad6d60dfb.png)

- OS version: Ubuntu 20.04
- PyTorch version: 

![image](https://user-images.githubusercontent.com/73210249/177235550-414ce314-c00e-4acc-9f1c-3169fbfe5eda.png)

- Python version: 3.8

Is there anything need to be changed to be able to train on CPU?
