New variance parameter: tension #169
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# Conflicts: # training/acoustic_task.py
# Conflicts: # utils/binarizer_utils.py
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This PR adds support for tension, a new variance parameter.
Briefly, tension is related to the ratio of the base harmonic to the full harmonics. Low ratio (meaning other harmonics are powerful compared to the base harmonic) stands for high tension.
Tension is normally expected to be a better successor to energy. It controls the strength of singing voice much more effectively, and pushes the expressiveness to a new level.
Other changes in this PR:
DecomposedWaveformclass to take apart aperiodict part, harmonic part and each level of harmonics from a waveform.hparamsfrom all pitch extraction APIs to make them more reusable.