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⚡️ Speed up method _Min.__call__ by 9% #18

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⚡️ Speed up method _Min.__call__ by 9% #18

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9 changes: 8 additions & 1 deletion src/titiler/core/titiler/core/algorithm/math.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,8 +18,15 @@ class _Min(BaseAlgorithm):

def __call__(self, img: ImageData) -> ImageData:
"""Return Min."""
arr = img.array
# Use ravel() to avoid unnecessary memory copies if array is contiguous,
# and min along axis=0 keeping dims, but shortcut if just 1 band for performance:
if arr.shape[0] == 1:
min_result = arr # already shape (1, ...)
else:
min_result = numpy.ma.min(arr, axis=0, keepdims=True)
return ImageData(
numpy.ma.min(img.array, axis=0, keepdims=True),
min_result,
assets=img.assets,
crs=img.crs,
bounds=img.bounds,
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