Add SynthID (watermerking by Google DeepMind) (#34350)

* Add SynthIDTextWatermarkLogitsProcessor

* esolving comments.

* Resolving comments.

* esolving commits,

* Improving SynthIDWatermark tests.

* switch to PT version

* detector as pretrained model + style

* update training + style

* rebase

* Update logits_process.py

* Improving SynthIDWatermark tests.

* Shift detector training to wikitext negatives and stabilize with lower learning rate.

* Clean up.

* in for 7B

* cleanup

* upport python 3.8.

* README and final cleanup.

* HF Hub upload and initiaze.

* Update requirements for synthid_text.

* Adding SynthIDTextWatermarkDetector.

* Detector testing.

* Documentation changes.

* Copyrights fix.

* Fix detector api.

* ironing out errors

* ironing out errors

* training checks

* make fixup and make fix-copies

* docstrings and add to docs

* copyright

* BC

* test docstrings

* move import

* protect type hints

* top level imports

* watermarking example

* direct imports

* tpr fpr meaning

* process_kwargs

* SynthIDTextWatermarkingConfig docstring

* assert -> exception

* example updates

* no immutable dict (cant be serialized)

* pack fn

* einsum equivalent

* import order

* fix test on gpu

* add detector example

---------

Co-authored-by: Sumedh Ghaisas <sumedhg@google.com>
Co-authored-by: Marc Sun <marc@huggingface.co>
Co-authored-by: sumedhghaisas2 <138781311+sumedhghaisas2@users.noreply.github.com>
Co-authored-by: raushan <raushan@huggingface.co>

docs/source/en/internal/generation_utils.md

@@ -185,6 +185,9 @@ generation.
 [[autodoc]] SuppressTokensLogitsProcessor
     - __call__
 
+[[autodoc]] SynthIDTextWatermarkLogitsProcessor
+    - __call__
+
 [[autodoc]] TemperatureLogitsWarper
     - __call__
 
@@ -418,5 +421,20 @@ A [`Constraint`] can be used to force the generation to include specific tokens
 
 ## Watermark Utils
 
+[[autodoc]] WatermarkingConfig
+    - __call__
+
 [[autodoc]] WatermarkDetector
     - __call__
+
+[[autodoc]] BayesianDetectorConfig
+    - __call__
+
+[[autodoc]] BayesianDetectorModel
+    - __call__
+
+[[autodoc]] SynthIDTextWatermarkingConfig
+    - __call__
+
+[[autodoc]] SynthIDTextWatermarkDetector
+    - __call__

docs/source/en/main_classes/text_generation.md

@@ -41,8 +41,6 @@ like token streaming.
 	- validate
 	- get_generation_mode
 
-[[autodoc]] generation.WatermarkingConfig
-
 ## GenerationMixin
 
 [[autodoc]] GenerationMixin