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Fall back to vanilla attention if xformers is not available #78

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Fall back to vanilla attention if xformers is not available #78

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8 changes: 8 additions & 0 deletions sgm/modules/diffusionmodules/model.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
# pytorch_diffusion + derived encoder decoder
import logging
import warnings
import math
from typing import Any, Callable, Optional

Expand Down Expand Up @@ -291,6 +292,13 @@ def make_attn(in_channels, attn_type="vanilla", attn_kwargs=None):
f"as it is too expensive. Please install xformers via e.g. 'pip install xformers==0.0.16'"
)
attn_type = "vanilla-xformers"
if attn_type == "vanilla-xformers" and not XFORMERS_IS_AVAILABLE:
warnings.warn(
f"Requested attention type {attn_type!r} but Xformers is not available; "
f"falling back to vanilla attention"
)
attn_type = "vanilla"
attn_kwargs = None
logpy.info(f"making attention of type '{attn_type}' with {in_channels} in_channels")
if attn_type == "vanilla":
assert attn_kwargs is None
Expand Down