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make parallel loading flag a part of constants. #12137

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Merged
merged 2 commits into from
Aug 14, 2025
Merged

make parallel loading flag a part of constants. #12137

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4a40033
make parallel loading flag a part of constants.
sayakpaul Aug 13, 2025
b57d356
Merge branch 'main' into hf-parallel-loading-constant
sayakpaul Aug 14, 2025
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5 changes: 2 additions & 3 deletions src/diffusers/models/modeling_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,9 +42,8 @@
from ..quantizers.quantization_config import QuantizationMethod
from ..utils import (
CONFIG_NAME,
ENV_VARS_TRUE_VALUES,
FLAX_WEIGHTS_NAME,
HF_PARALLEL_LOADING_FLAG,
HF_ENABLE_PARALLEL_LOADING,
SAFE_WEIGHTS_INDEX_NAME,
SAFETENSORS_WEIGHTS_NAME,
WEIGHTS_INDEX_NAME,
Expand Down Expand Up @@ -962,7 +961,7 @@ def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.P
dduf_entries: Optional[Dict[str, DDUFEntry]] = kwargs.pop("dduf_entries", None)
disable_mmap = kwargs.pop("disable_mmap", False)

is_parallel_loading_enabled = os.environ.get(HF_PARALLEL_LOADING_FLAG, "").upper() in ENV_VARS_TRUE_VALUES
is_parallel_loading_enabled = HF_ENABLE_PARALLEL_LOADING
if is_parallel_loading_enabled and not low_cpu_mem_usage:
raise NotImplementedError("Parallel loading is not supported when not using `low_cpu_mem_usage`.")

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2 changes: 1 addition & 1 deletion src/diffusers/utils/__init__.py
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Expand Up @@ -25,8 +25,8 @@
DIFFUSERS_DYNAMIC_MODULE_NAME,
FLAX_WEIGHTS_NAME,
GGUF_FILE_EXTENSION,
HF_ENABLE_PARALLEL_LOADING,
HF_MODULES_CACHE,
HF_PARALLEL_LOADING_FLAG,
HUGGINGFACE_CO_RESOLVE_ENDPOINT,
MIN_PEFT_VERSION,
ONNX_EXTERNAL_WEIGHTS_NAME,
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2 changes: 1 addition & 1 deletion src/diffusers/utils/constants.py
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Expand Up @@ -44,7 +44,7 @@
DIFFUSERS_ATTN_BACKEND = os.getenv("DIFFUSERS_ATTN_BACKEND", "native")
DIFFUSERS_ATTN_CHECKS = os.getenv("DIFFUSERS_ATTN_CHECKS", "0") in ENV_VARS_TRUE_VALUES
DEFAULT_HF_PARALLEL_LOADING_WORKERS = 8
HF_PARALLEL_LOADING_FLAG = "HF_ENABLE_PARALLEL_LOADING"
HF_ENABLE_PARALLEL_LOADING = os.environ.get("HF_ENABLE_PARALLEL_LOADING", "").upper() in ENV_VARS_TRUE_VALUES

# Below should be `True` if the current version of `peft` and `transformers` are compatible with
# PEFT backend. Will automatically fall back to PEFT backend if the correct versions of the libraries are
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