transformers/docs/source/en/internal/modeling_utils.md
Cyril Vallez 163138a911
🚨🚨[core] Completely rewrite the masking logic for all attentions (#37866)
* start

* start having a clean 4d mask primitive

* Update mask_utils.py

* Update mask_utils.py

* switch name

* Update masking_utils.py

* add a new AttentionMask tensor class

* fix import

* nits

* fixes

* use full and quandrants

* general sdpa mask for all caches

* style

* start some tests

* tests with sliding, chunked

* add styling

* test hybrid

* Update masking_utils.py

* small temp fixes

* Update modeling_gemma2.py

* compile compatible

* Update masking_utils.py

* improve

* start making it more general

* Update masking_utils.py

* generate

* make it work with flex style primitives!

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* improve

* Update cache_utils.py

* Update masking_utils.py

* simplify - starting to look good!

* Update masking_utils.py

* name

* Update masking_utils.py

* style

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* small fix for flex

* flex compile

* FA2

* Update masking_utils.py

* Escape for TGI/vLLM!

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* General case without cache

* rename

* full test on llama4

* small fix for FA2 guard with chunk

* Update modeling_gemma2.py

* post rebase cleanup

* FA2 supports static cache!

* Update modeling_flash_attention_utils.py

* Update flex_attention.py

* Update masking_utils.py

* Update masking_utils.py

* Update utils.py

* override for export

* Update executorch.py

* Update executorch.py

* Update executorch.py

* Update executorch.py

* Update masking_utils.py

* Update masking_utils.py

* output attentions

* style

* Update masking_utils.py

* Update executorch.py

* Add doicstring

* Add license and put mask visualizer at the end

* Update test_modeling_common.py

* fix broken test

* Update test_modeling_gemma.py

* Update test_modeling_gemma2.py

* Use fullgraph=False with FA2

* Update utils.py

* change name

* Update masking_utils.py

* improve doc

* change name

* Update modeling_attn_mask_utils.py

* more explicit logic based on model's property

* pattern in config

* extend

* fixes

* make it better

* generalize to other test models

* fix

* Update masking_utils.py

* fix

* do not check mask equivalence if layer types are different

* executorch

* Update modeling_gemma2.py

* Update masking_utils.py

* use layer_idx instead

* adjust

* Update masking_utils.py

* test

* fix imports

* Update modeling_gemma2.py

* other test models

* Update modeling_llama4.py

* Update masking_utils.py

* improve

* simplify

* Update masking_utils.py

* typos

* typo

* fix

* Update masking_utils.py

* default DynamicCache

* remove default cache

* simplify

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* simplify

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* export

* Update executorch.py

* Update executorch.py

* Update flex_attention.py

* Update executorch.py

* upstream to modular gemma 1 & 2

* Update modular_mistral.py

* switch names

* use dict

* put it in the Layer directly

* update copy model source for mask functions

* apply so many modular (hopefully 1 shot)

* use explicite dicts for make style happy

* protect import

* check docstring

* better default in hybrid caches

* qwens

* Update modular_qwen2.py

* simplify core logic!

* Update executorch.py

* qwen3 moe

* Update masking_utils.py

* Update masking_utils.py

* simplify a lot sdpa causal skip

* Update masking_utils.py

* post-rebase

* gemma3 finally

* style

* check it before

* gemma3

* More general with newer torch

* align gemma3

* Update utils.py

* Update utils.py

* Update masking_utils.py

* Update test_modeling_common.py

* Update flex_attention.py

* Update flex_attention.py

* Update flex_attention.py

* test

* executorch

* Update test_modeling_common.py

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* Update masking_utils.py

* Update executorch.py

* Update test_modeling_common.py

* fix copies

* device

* sdpa can be used without mask -> pass the torchscript tests in this case

* Use enum for check

* revert enum and add check instead

* remove broken test

* cohere2

* some doc & reorganize the Interface

* Update tensor_parallel.py

* Update tensor_parallel.py

* doc and dummy

* Update test_modeling_paligemma2.py

* Update modeling_falcon_h1.py

* Update masking_utils.py

* executorch patch

* style

* CIs

* use register in executorch

* final comments!

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Co-authored-by: Arthur Zucker <arthur.zucker@gmail.com>
2025-05-22 11:38:26 +02:00

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# Custom Layers and Utilities
This page lists all the custom layers used by the library, as well as the utility functions and classes it provides for modeling.
Most of those are only useful if you are studying the code of the models in the library.
## Layers
[[autodoc]] GradientCheckpointingLayer
## Attention Functions
[[autodoc]] AttentionInterface
- register
## Attention Mask Functions
[[autodoc]] AttentionMaskInterface
- register
## Rotary Position Embedding Functions
[[autodoc]] dynamic_rope_update
## Pytorch custom modules
[[autodoc]] pytorch_utils.Conv1D
## PyTorch Helper Functions
[[autodoc]] pytorch_utils.apply_chunking_to_forward
[[autodoc]] pytorch_utils.find_pruneable_heads_and_indices
[[autodoc]] pytorch_utils.prune_layer
[[autodoc]] pytorch_utils.prune_conv1d_layer
[[autodoc]] pytorch_utils.prune_linear_layer
## TensorFlow custom layers
[[autodoc]] modeling_tf_utils.TFConv1D
[[autodoc]] modeling_tf_utils.TFSequenceSummary
## TensorFlow loss functions
[[autodoc]] modeling_tf_utils.TFCausalLanguageModelingLoss
[[autodoc]] modeling_tf_utils.TFMaskedLanguageModelingLoss
[[autodoc]] modeling_tf_utils.TFMultipleChoiceLoss
[[autodoc]] modeling_tf_utils.TFQuestionAnsweringLoss
[[autodoc]] modeling_tf_utils.TFSequenceClassificationLoss
[[autodoc]] modeling_tf_utils.TFTokenClassificationLoss
## TensorFlow Helper Functions
[[autodoc]] modeling_tf_utils.get_initializer
[[autodoc]] modeling_tf_utils.keras_serializable
[[autodoc]] modeling_tf_utils.shape_list