GitLab

* add `zero_mean_unit_var_norm` function

* normalize before MEL computation

* fixup

* add simple test

* quality

* Update tests/models/whisper/test_feature_extraction_whisper.py
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>

* fixup

* use attention masks if padding was applied

* Update based on review
Co-authored-by: bofeng huang <bofenghuang7@gmail.com>

---------
Co-authored-by: Sanchit Gandhi <93869735+sanchit-gandhi@users.noreply.github.com>
Co-authored-by: bofeng huang <bofenghuang7@gmail.com>