How to train end2end tts
I want to train an end2end tts model like fastpitch_hifigan_e2e but I don't find any tutorial for that. I tried to train it like Tacotron but I understood that fastpitch_hifigan_e2e needs "Phoneme durations" file and again I don't find any guide for that(exactly what should this file have and what is format of it. [this explanation](https://github.com/NVIDIA/NeMo/blob/main/docs/source/tts/datasets.rst) is not complete). 
thanks for any help.
