`device_map` in `load_model_dict_into_meta` (#10851)

* `device_map` in `load_model_dict_into_meta`

* _LOW_CPU_MEM_USAGE_DEFAULT

* fix is_peft_version is_bitsandbytes_version

src/diffusers/loaders/transformer_flux.py

@@ -17,7 +17,7 @@ from ..models.embeddings import (
     ImageProjection,
     MultiIPAdapterImageProjection,
 )
-from ..models.modeling_utils import load_model_dict_into_meta
+from ..models.modeling_utils import _LOW_CPU_MEM_USAGE_DEFAULT, load_model_dict_into_meta
 from ..utils import (
     is_accelerate_available,
     is_torch_version,
@@ -36,7 +36,7 @@ class FluxTransformer2DLoadersMixin:
     Load layers into a [`FluxTransformer2DModel`].
     """
 
-    def _convert_ip_adapter_image_proj_to_diffusers(self, state_dict, low_cpu_mem_usage=False):
+    def _convert_ip_adapter_image_proj_to_diffusers(self, state_dict, low_cpu_mem_usage=_LOW_CPU_MEM_USAGE_DEFAULT):
         if low_cpu_mem_usage:
             if is_accelerate_available():
                 from accelerate import init_empty_weights
@@ -82,11 +82,12 @@ class FluxTransformer2DLoadersMixin:
         if not low_cpu_mem_usage:
             image_projection.load_state_dict(updated_state_dict, strict=True)
         else:
-            load_model_dict_into_meta(image_projection, updated_state_dict, device=self.device, dtype=self.dtype)
+            device_map = {"": self.device}
+            load_model_dict_into_meta(image_projection, updated_state_dict, device_map=device_map, dtype=self.dtype)
 
         return image_projection
 
-    def _convert_ip_adapter_attn_to_diffusers(self, state_dicts, low_cpu_mem_usage=False):
+    def _convert_ip_adapter_attn_to_diffusers(self, state_dicts, low_cpu_mem_usage=_LOW_CPU_MEM_USAGE_DEFAULT):
         from ..models.attention_processor import (
             FluxIPAdapterJointAttnProcessor2_0,
         )
@@ -151,15 +152,15 @@ class FluxTransformer2DLoadersMixin:
                 if not low_cpu_mem_usage:
                     attn_procs[name].load_state_dict(value_dict)
                 else:
-                    device = self.device
+                    device_map = {"": self.device}
                     dtype = self.dtype
-                    load_model_dict_into_meta(attn_procs[name], value_dict, device=device, dtype=dtype)
+                    load_model_dict_into_meta(attn_procs[name], value_dict, device_map=device_map, dtype=dtype)
 
                 key_id += 1
 
         return attn_procs
 
-    def _load_ip_adapter_weights(self, state_dicts, low_cpu_mem_usage=False):
+    def _load_ip_adapter_weights(self, state_dicts, low_cpu_mem_usage=_LOW_CPU_MEM_USAGE_DEFAULT):
         if not isinstance(state_dicts, list):
             state_dicts = [state_dicts]
 

src/diffusers/loaders/transformer_sd3.py

@@ -75,8 +75,9 @@ class SD3Transformer2DLoadersMixin:
             if not low_cpu_mem_usage:
                 attn_procs[name].load_state_dict(layer_state_dict[idx], strict=True)
             else:
+                device_map = {"": self.device}
                 load_model_dict_into_meta(
-                    attn_procs[name], layer_state_dict[idx], device=self.device, dtype=self.dtype
+                    attn_procs[name], layer_state_dict[idx], device_map=device_map, dtype=self.dtype
                 )
 
         return attn_procs
@@ -144,7 +145,8 @@ class SD3Transformer2DLoadersMixin:
         if not low_cpu_mem_usage:
             image_proj.load_state_dict(updated_state_dict, strict=True)
         else:
-            load_model_dict_into_meta(image_proj, updated_state_dict, device=self.device, dtype=self.dtype)
+            device_map = {"": self.device}
+            load_model_dict_into_meta(image_proj, updated_state_dict, device_map=device_map, dtype=self.dtype)
 
         return image_proj
 

src/diffusers/loaders/unet.py

@@ -30,7 +30,7 @@ from ..models.embeddings import (
     IPAdapterPlusImageProjection,
     MultiIPAdapterImageProjection,
 )
-from ..models.modeling_utils import load_model_dict_into_meta, load_state_dict
+from ..models.modeling_utils import _LOW_CPU_MEM_USAGE_DEFAULT, load_model_dict_into_meta, load_state_dict
 from ..utils import (
     USE_PEFT_BACKEND,
     _get_model_file,
@@ -143,7 +143,7 @@ class UNet2DConditionLoadersMixin:
         adapter_name = kwargs.pop("adapter_name", None)
         _pipeline = kwargs.pop("_pipeline", None)
         network_alphas = kwargs.pop("network_alphas", None)
-        low_cpu_mem_usage = kwargs.pop("low_cpu_mem_usage", False)
+        low_cpu_mem_usage = kwargs.pop("low_cpu_mem_usage", _LOW_CPU_MEM_USAGE_DEFAULT)
         allow_pickle = False
 
         if low_cpu_mem_usage and is_peft_version("<=", "0.13.0"):
@@ -540,7 +540,7 @@ class UNet2DConditionLoadersMixin:
 
         return state_dict
 
-    def _convert_ip_adapter_image_proj_to_diffusers(self, state_dict, low_cpu_mem_usage=False):
+    def _convert_ip_adapter_image_proj_to_diffusers(self, state_dict, low_cpu_mem_usage=_LOW_CPU_MEM_USAGE_DEFAULT):
         if low_cpu_mem_usage:
             if is_accelerate_available():
                 from accelerate import init_empty_weights
@@ -753,11 +753,12 @@ class UNet2DConditionLoadersMixin:
         if not low_cpu_mem_usage:
             image_projection.load_state_dict(updated_state_dict, strict=True)
         else:
-            load_model_dict_into_meta(image_projection, updated_state_dict, device=self.device, dtype=self.dtype)
+            device_map = {"": self.device}
+            load_model_dict_into_meta(image_projection, updated_state_dict, device_map=device_map, dtype=self.dtype)
 
         return image_projection
 
-    def _convert_ip_adapter_attn_to_diffusers(self, state_dicts, low_cpu_mem_usage=False):
+    def _convert_ip_adapter_attn_to_diffusers(self, state_dicts, low_cpu_mem_usage=_LOW_CPU_MEM_USAGE_DEFAULT):
         from ..models.attention_processor import (
             IPAdapterAttnProcessor,
             IPAdapterAttnProcessor2_0,
@@ -846,13 +847,14 @@ class UNet2DConditionLoadersMixin:
                 else:
                     device = next(iter(value_dict.values())).device
                     dtype = next(iter(value_dict.values())).dtype
-                    load_model_dict_into_meta(attn_procs[name], value_dict, device=device, dtype=dtype)
+                    device_map = {"": device}
+                    load_model_dict_into_meta(attn_procs[name], value_dict, device_map=device_map, dtype=dtype)
 
                 key_id += 2
 
         return attn_procs
 
-    def _load_ip_adapter_weights(self, state_dicts, low_cpu_mem_usage=False):
+    def _load_ip_adapter_weights(self, state_dicts, low_cpu_mem_usage=_LOW_CPU_MEM_USAGE_DEFAULT):
         if not isinstance(state_dicts, list):
             state_dicts = [state_dicts]
 

src/diffusers/utils/import_utils.py

@@ -815,7 +815,7 @@ def is_peft_version(operation: str, version: str):
         version (`str`):
             A version string
     """
-    if not _peft_version:
+    if not _peft_available:
         return False
     return compare_versions(parse(_peft_version), operation, version)
 
@@ -829,7 +829,7 @@ def is_bitsandbytes_version(operation: str, version: str):
         version (`str`):
             A version string
     """
-    if not _bitsandbytes_version:
+    if not _bitsandbytes_available:
         return False
     return compare_versions(parse(_bitsandbytes_version), operation, version)