[diffusion] refactor: move model_stages into stages folder (sgl-project#18248)

Author: mickqian

python/sglang/multimodal_gen/runtime/pipelines/glm_image.py

@@ -1,6 +1,3 @@
-from sglang.multimodal_gen.runtime.models.model_stages.glm_image import (
-    GlmImageBeforeDenoisingStage,
-)
 from sglang.multimodal_gen.runtime.pipelines_core import LoRAPipeline
 from sglang.multimodal_gen.runtime.pipelines_core.composed_pipeline_base import (
     ComposedPipelineBase,
@@ -9,6 +6,9 @@
     DecodingStage,
     DenoisingStage,
 )
+from sglang.multimodal_gen.runtime.pipelines_core.stages.model_specific_stages.glm_image import (
+    GlmImageBeforeDenoisingStage,
+)
 from sglang.multimodal_gen.runtime.server_args import ServerArgs
 from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger
 

python/sglang/multimodal_gen/runtime/pipelines/mova_pipeline.py

@@ -7,12 +7,6 @@
 
 from sglang.multimodal_gen.configs.pipeline_configs.mova import MOVAPipelineConfig
 from sglang.multimodal_gen.configs.sample.mova import MOVASamplingParams
-from sglang.multimodal_gen.runtime.models.model_stages.mova import (
-    MOVADecodingStage,
-    MOVADenoisingStage,
-    MOVALatentPreparationStage,
-    MOVATimestepPreparationStage,
-)
 from sglang.multimodal_gen.runtime.pipelines_core.composed_pipeline_base import (
     ComposedPipelineBase,
 )
@@ -22,6 +16,12 @@
     InputValidationStage,
     TextEncodingStage,
 )
+from sglang.multimodal_gen.runtime.pipelines_core.stages.model_specific_stages.mova import (
+    MOVADecodingStage,
+    MOVADenoisingStage,
+    MOVALatentPreparationStage,
+    MOVATimestepPreparationStage,
+)
 from sglang.multimodal_gen.runtime.server_args import ServerArgs
 from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger
 

python/sglang/multimodal_gen/runtime/pipelines/qwen_image.py

@@ -3,9 +3,6 @@
 # SPDX-License-Identifier: Apache-2.0
 from diffusers.image_processor import VaeImageProcessor
 
-from sglang.multimodal_gen.runtime.models.model_stages.qwen_image_layered import (
-    QwenImageLayeredBeforeDenoisingStage,
-)
 from sglang.multimodal_gen.runtime.pipelines_core import LoRAPipeline
 from sglang.multimodal_gen.runtime.pipelines_core.composed_pipeline_base import (
     ComposedPipelineBase,
@@ -24,6 +21,9 @@
 from sglang.multimodal_gen.runtime.pipelines_core.stages.conditioning import (
     ConditioningStage,
 )
+from sglang.multimodal_gen.runtime.pipelines_core.stages.model_specific_stages.qwen_image_layered import (
+    QwenImageLayeredBeforeDenoisingStage,
+)
 from sglang.multimodal_gen.runtime.server_args import ServerArgs
 from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger