onnx-web/api/onnx_web/diffusers/version_safe_diffusers.py

import diffusers
from diffusers import *  # NOQA
from packaging import version

is_diffusers_0_15 = version.parse(
    version.parse(diffusers.__version__).base_version
) >= version.parse("0.15")


try:
    from diffusers import DEISMultistepScheduler
except ImportError:
    from ..diffusers.stub_scheduler import StubScheduler as DEISMultistepScheduler

try:
    from diffusers import LCMScheduler
except ImportError:
    from ..diffusers.stub_scheduler import StubScheduler as LCMScheduler

try:
    from diffusers import UniPCMultistepScheduler
except ImportError:
    from ..diffusers.stub_scheduler import StubScheduler as UniPCMultistepScheduler


if is_diffusers_0_15:
    from diffusers.models.attention_processor import AttnProcessor
else:
    from diffusers.models.cross_attention import CrossAttnProcessor as AttnProcessor