[WIP] Add Flux2 modular (#12763)

* update

* update

* update

* update

* update

* update

* update

* update

* update

* update

Author: DN6

src/diffusers/__init__.py

@@ -404,6 +404,8 @@
 else:
     _import_structure["modular_pipelines"].extend(
         [
+            "Flux2AutoBlocks",
+            "Flux2ModularPipeline",
             "FluxAutoBlocks",
             "FluxKontextAutoBlocks",
             "FluxKontextModularPipeline",
@@ -1111,6 +1113,8 @@
         from .utils.dummy_torch_and_transformers_objects import *  # noqa F403
     else:
         from .modular_pipelines import (
+            Flux2AutoBlocks,
+            Flux2ModularPipeline,
             FluxAutoBlocks,
             FluxKontextAutoBlocks,
             FluxKontextModularPipeline,

src/diffusers/modular_pipelines/__init__.py

@@ -52,6 +52,10 @@
         "FluxKontextAutoBlocks",
         "FluxKontextModularPipeline",
     ]
+    _import_structure["flux2"] = [
+        "Flux2AutoBlocks",
+        "Flux2ModularPipeline",
+    ]
     _import_structure["qwenimage"] = [
         "QwenImageAutoBlocks",
         "QwenImageModularPipeline",
@@ -75,6 +79,7 @@
     else:
         from .components_manager import ComponentsManager
         from .flux import FluxAutoBlocks, FluxKontextAutoBlocks, FluxKontextModularPipeline, FluxModularPipeline
+        from .flux2 import Flux2AutoBlocks, Flux2ModularPipeline
         from .modular_pipeline import (
             AutoPipelineBlocks,
             BlockState,

src/diffusers/modular_pipelines/flux2/__init__.py

@@ -0,0 +1,111 @@
+from typing import TYPE_CHECKING
+
+from ...utils import (
+    DIFFUSERS_SLOW_IMPORT,
+    OptionalDependencyNotAvailable,
+    _LazyModule,
+    get_objects_from_module,
+    is_torch_available,
+    is_transformers_available,
+)
+
+
+_dummy_objects = {}
+_import_structure = {}
+
+try:
+    if not (is_transformers_available() and is_torch_available()):
+        raise OptionalDependencyNotAvailable()
+except OptionalDependencyNotAvailable:
+    from ...utils import dummy_torch_and_transformers_objects  # noqa F403
+
+    _dummy_objects.update(get_objects_from_module(dummy_torch_and_transformers_objects))
+else:
+    _import_structure["encoders"] = [
+        "Flux2TextEncoderStep",
+        "Flux2RemoteTextEncoderStep",
+        "Flux2VaeEncoderStep",
+    ]
+    _import_structure["before_denoise"] = [
+        "Flux2SetTimestepsStep",
+        "Flux2PrepareLatentsStep",
+        "Flux2RoPEInputsStep",
+        "Flux2PrepareImageLatentsStep",
+    ]
+    _import_structure["denoise"] = [
+        "Flux2LoopDenoiser",
+        "Flux2LoopAfterDenoiser",
+        "Flux2DenoiseLoopWrapper",
+        "Flux2DenoiseStep",
+    ]
+    _import_structure["decoders"] = ["Flux2DecodeStep"]
+    _import_structure["inputs"] = [
+        "Flux2ProcessImagesInputStep",
+        "Flux2TextInputStep",
+    ]
+    _import_structure["modular_blocks"] = [
+        "ALL_BLOCKS",
+        "AUTO_BLOCKS",
+        "REMOTE_AUTO_BLOCKS",
+        "TEXT2IMAGE_BLOCKS",
+        "IMAGE_CONDITIONED_BLOCKS",
+        "Flux2AutoBlocks",
+        "Flux2AutoVaeEncoderStep",
+        "Flux2BeforeDenoiseStep",
+        "Flux2VaeEncoderSequentialStep",
+    ]
+    _import_structure["modular_pipeline"] = ["Flux2ModularPipeline"]
+
+if TYPE_CHECKING or DIFFUSERS_SLOW_IMPORT:
+    try:
+        if not (is_transformers_available() and is_torch_available()):
+            raise OptionalDependencyNotAvailable()
+    except OptionalDependencyNotAvailable:
+        from ...utils.dummy_torch_and_transformers_objects import *  # noqa F403
+    else:
+        from .before_denoise import (
+            Flux2PrepareImageLatentsStep,
+            Flux2PrepareLatentsStep,
+            Flux2RoPEInputsStep,
+            Flux2SetTimestepsStep,
+        )
+        from .decoders import Flux2DecodeStep
+        from .denoise import (
+            Flux2DenoiseLoopWrapper,
+            Flux2DenoiseStep,
+            Flux2LoopAfterDenoiser,
+            Flux2LoopDenoiser,
+        )
+        from .encoders import (
+            Flux2RemoteTextEncoderStep,
+            Flux2TextEncoderStep,
+            Flux2VaeEncoderStep,
+        )
+        from .inputs import (
+            Flux2ProcessImagesInputStep,
+            Flux2TextInputStep,
+        )
+        from .modular_blocks import (
+            ALL_BLOCKS,
+            AUTO_BLOCKS,
+            IMAGE_CONDITIONED_BLOCKS,
+            REMOTE_AUTO_BLOCKS,
+            TEXT2IMAGE_BLOCKS,
+            Flux2AutoBlocks,
+            Flux2AutoVaeEncoderStep,
+            Flux2BeforeDenoiseStep,
+            Flux2VaeEncoderSequentialStep,
+        )
+        from .modular_pipeline import Flux2ModularPipeline
+else:
+    import sys
+
+    sys.modules[__name__] = _LazyModule(
+        __name__,
+        globals()["__file__"],
+        _import_structure,
+        module_spec=__spec__,
+    )
+
+    for name, value in _dummy_objects.items():
+        setattr(sys.modules[__name__], name, value)