[TTS] Append pretrained FastPitch & SpectrogamEnhancer pair to available models

[racoiaws]

What does this PR do ?

Add aliases for pretrained English FastPitch and SpectrogramEnhancer models (already published on NGC)
https://catalog.ngc.nvidia.com/orgs/nvidia/teams/nemo/models/tts_en_fastpitch_spectrogram_enhancer_for_asr_finetuning

Will be used in upcoming ASR-TTS tutorial.

Collection: TTS

Changelog

• Add tts_en_fastpitch_for_asr_finetuning model to list of FastPitch models
• Add tts_en_spectrogram_enhancer_for_asr_finetuning model to list of SpectrogramEnhancer models

Usage

import nemo
from nemo.collections.tts.models import FastPitchModel, SpectrogramEnhancerModel

fastpitch = FastPitchModel.from_pretrained(model_name="tts_en_fastpitch_for_asr_finetuning")
enhancer = SpectrogramEnhancerModel.from_pretrained(model_name="tts_en_spectrogram_enhancer_for_asr_finetuning")

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Additional Information

• Related to Add ASR with TTS Tutorial. Fix enhancer usage. #6955

[artbataev]

Thanks!
I checked the tutorial, everything works fine.