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Support unsafe casting in Delta filter #657

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Support unsafe casting in Delta filter #657

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91e0c9a
Support unsafe casting in Delta filter
ehgus Nov 24, 2024
0780934
ruff formatting
ehgus Nov 24, 2024
81a744d
add floating point overflow unit test for Delta filter
ehgus Nov 30, 2024
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2 changes: 1 addition & 1 deletion numcodecs/delta.py
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,7 @@ def encode(self, buf):
if arr.dtype == bool:
np.not_equal(arr[1:], arr[:-1], out=enc[1:])
else:
np.subtract(arr[1:], arr[:-1], out=enc[1:])
np.subtract(arr[1:], arr[:-1], out=enc[1:], casting='unsafe')

return enc

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23 changes: 14 additions & 9 deletions numcodecs/tests/test_delta.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,19 +13,24 @@
# mix of dtypes: integer, float
# mix of shapes: 1D, 2D, 3D
# mix of orders: C, F
# mix of encoding types: All available types for each arrays
arrays = [
np.random.randint(0, 1, size=110, dtype='?').reshape(10, 11),
np.arange(1000, dtype='<i4'),
np.linspace(1000, 1001, 1000, dtype='<f4').reshape(100, 10),
np.random.normal(loc=1000, scale=1, size=(10, 10, 10)).astype('<f8'),
np.random.randint(0, 200, size=1000, dtype='u2').astype('<u2').reshape(100, 10, order='F'),
(np.random.randint(0, 1, size=110, dtype='?').reshape(10, 11), ('?', '<u1', '<i1')),
(np.arange(1000, dtype='<i4'), ('<i4', '<i2', '<u4', 'u2')),
(np.linspace(1000, 1001, 1000, dtype='<f4').reshape(100, 10), ('<f4',)),
(np.random.normal(loc=1000, scale=1, size=(10, 10, 10)).astype('<f8'), ('<f8',)),
(
np.random.randint(0, 200, size=1000, dtype='u2').astype('<u2').reshape(100, 10, order='F'),
('<i2',),
),
]


def test_encode_decode():
for arr in arrays:
codec = Delta(dtype=arr.dtype)
check_encode_decode(arr, codec)
for arr, encoding_types in arrays:
for astype in encoding_types:
codec = Delta(dtype=arr.dtype, astype=astype)
check_encode_decode(arr, codec)


def test_encode():
Expand All @@ -49,7 +54,7 @@ def test_repr():


def test_backwards_compatibility():
for arr in arrays:
for arr, _ in arrays:
codec = Delta(dtype=arr.dtype)
check_backwards_compatibility(Delta.codec_id, [arr], [codec], prefix=str(arr.dtype))

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