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* Backprop Test for Freeze FlaxWav2Vec2 Feature Encoder

* remove jnp.ndarray type suggestion

* assert frozen grads are precisely zero

* Freeze FlaxWav2Vec2 Feature Encoder

* add to all module apply

* add backprop test

* Fixing the timestamps with chunking.

* The changes modified (and fixed) the striding tests.

* Adding a tokenizer test.

* Update src/transformers/pipelines/automatic_speech_recognition.py
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* Defense -> comment.

* Update src/transformers/models/wav2vec2/tokenization_wav2vec2.py
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* Per-folder tests reorganization
Co-authored-by: sgugger <sylvain.gugger@gmail.com>
Co-authored-by: Stas Bekman <stas@stason.org>