Add SigLIP 2 (#36323)

* Docs

* Inits

* Auto classes

* Add siglip base

* Add base tests

* Fix Siglip V1 for fix res version

* Add image processor

* Update conversion

* Experimenting with vectorized embeddings

* Fixup

* Add modular Siglip2Processor

* Add modular configuration

* Rename num patches

* Correct image and text features merging

* Working conversion script

* Refactoring conversion script

* Remove unused code in conversion script

* Shorten dict a bit

* Refactoring conversion

* Done conversion refactoring

* Fixup

* Modular siglip2

* Make model exportable and compilable without graph breaks

* Remove position_ids from image_processor

* REmove position ids from modeling file

* Update modular

* Type hint

* Fixup

* Set defaults to processor

* Add integration test

* Revert spatial shapes back to tensor

* Change order

* Fix most of the tests

* Fix docstring

* Remove interpolate_pos_encoding arg (not needed)

* Update docs

* Standardize processing

* Fix attention_mask in vision head

* Siglip v1: remove double transpose in FA2

* Update modular file

* Update FA2 test

* Update expected logits

* Fix interpolation for siglip2 image processor

* Skip init test

* Skip dispatch on flash test

* Fix modeling tests

* Fixup

* Add dummy objects

* Fix some docstrings

* Add siglip2 in index.md

* Fix consistency

* Add docs

* Remove size and data format

* Add image processor tests

* Fix

* Add fast image processor

* Fix style

* Fix

* Docs

* Set lowercase for tokenizer

* Adjust head size for Siglip v1

* Update siglip2 for consistency with siglip1

* Update siglip2 conversion

* Update pipeline

* Update checkpoints in tests

* Update checkpoint name

* Fix pooling for image classification model

* Fix FA2 test

* Update processor

* Fix check repo

* Update docs

* Fix typos

* Fix docstring for fast image processor

* Add siglip2 to FA2 docs

* Fix fast ip tests

* Fix constitency

* Fix tokenizer class for siglip v1

* Fix missing header

* Refactor scaling for clip, siglip, siglip2

* Remove unused imports

* Make fast IP default for siglip2

* Update docs

* Update checkpoints

* Update modular

* Update paper link

* Fixup

* Fix name in toctree

* Fix test

docs/source/en/index.md

@@ -317,6 +317,7 @@ Flax), PyTorch, and/or TensorFlow.
 |                           [SEW](model_doc/sew)                           |       ✅        |         ❌         |      ❌      |
 |                         [SEW-D](model_doc/sew-d)                         |       ✅        |         ❌         |      ❌      |
 |                        [SigLIP](model_doc/siglip)                        |       ✅        |         ❌         |      ❌      |
+|                       [SigLIP2](model_doc/siglip2)                       |       ✅        |         ❌         |      ❌      |
 |                       [SmolVLM](model_doc/smolvlm)                       |       ✅        |         ❌         |      ❌      |
 |        [Speech Encoder decoder](model_doc/speech-encoder-decoder)        |       ✅        |         ❌         |      ✅      |
 |                 [Speech2Text](model_doc/speech_to_text)                  |       ✅        |         ✅         |      ❌      |