Vits2 prototype

[p0p4k]

continuing where i left earlier, adding some test cases.

• to do -> fix test cases to take in mel instead of linear spectrogram (if anywhere)

[erogol]

Looks like a bug (from CI)

======================================================================
ERROR: test_d_vector_forward (tests.tts_tests.test_vits2.TestVits2)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/TTS/TTS/tests/tts_tests/test_vits2.py", line 214, in test_d_vector_forward
    model = Vits2.init_from_config(config, verbose=False).to(device)
  File "/home/runner/work/TTS/TTS/TTS/tts/models/vits2.py", line 1862, in init_from_config
    return Vits2(new_config, ap, tokenizer, speaker_manager, language_manager)
  File "/home/runner/work/TTS/TTS/TTS/tts/models/vits2.py", line 652, in __init__
    self.use_transformer_flow_layer = self.args.use_transformer_flow_layer
  File "/opt/hostedtoolcache/Python/3.9.18/x64/lib/python3.9/site-packages/coqpit/coqpit.py", line 626, in __getattribute__
    value = super().__getattribute__(arg)
AttributeError: 'Vits2Args' object has no attribute 'use_transformer_flow_layer'

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