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fix _build_nn for cpu only #285

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fix _build_nn for cpu only #285

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9 changes: 7 additions & 2 deletions src/cellflow/preprocessing/_wknn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -185,8 +185,13 @@ def _build_nn(
try:
from cuml.neighbors import NearestNeighbors

jax.devices("gpu")
except ImportError:
has_gpu = any(d.platform == "gpu" for d in jax.devices())
if has_gpu:
jax.devices("gpu")
else:
raise RuntimeError("No GPU backend available")

except (ImportError, RuntimeError):
logger.info(
"cuML is not installed or GPU is not available. Falling back to neighborhood estimation using CPU with pynndescent."
)
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