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* add watermarking processor

* remove the other hashing (context width=1 always)

* make style

* Update src/transformers/generation/logits_process.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/logits_process.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/logits_process.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/configuration_utils.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* update watermarking process

* add detector

* update tests to use detector

* fix failing tests

* rename `input_seq`

* make style

* doc for processor

* minor fixes

* docs

* make quality

* Update src/transformers/generation/configuration_utils.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/logits_process.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/watermarking.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/watermarking.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/watermarking.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* add PR suggestions

* let's use lru_cache's default max size (128)

* import processor if torch available

* maybe like this

* lets move the config to torch independet file

* add docs

* tiny docs fix to make the test happy

* Update src/transformers/generation/configuration_utils.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Update src/transformers/generation/watermarking.py
Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>

* PR suggestions

* add docs

* fix test

* fix docs

* address pr comments

* style

* Revert "style"

This reverts commit 7f33cc34ff08b414f8e7f90060889877606b43b2.

* correct style

* make doctest green

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Co-authored-by: Joao Gante <joaofranciscocardosogante@gmail.com>