MAINT: Prevent OverflowError in multiplication #230
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In newer numpy versions the multiplication of ndarrays containing uint8 results in uint8. Here this leads to an OverflowError. Therefore changing to an uint64 before the multiplication prevents this.
cbespin
approved these changes
Oct 10, 2024
basil/utils/utils.py
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| @@ -41,7 +41,7 @@ def bitarray_to_byte_array(bitarr): | |||
| ba = bitarray(bitarr, endian=bitarr.endian()) | |||
| ba.reverse() # this flip the byte order and the bit order of each byte | |||
| bs = np.frombuffer(ba.tobytes(), dtype=np.uint8) # byte padding happens here, bitarray.tobytes() | |||
| bs = (bs * 0x0202020202 & 0x010884422010) % 1023 | |||
| bs = (bs.astype(np.uint64) * 0x0202020202 & 0x010884422010) % 1023 | |||
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I would argue it is a bit easier to follow if you do bs * np.uint64(0x0202020202) to make the casting more explicit and keep bs an array of uint8 aka bytes. Performance seems to be about the same with a very simple test.
MarcoVogt
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Oct 27, 2024
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In newer numpy versions the multiplication of ndarrays containing uint8 results in uint8. Here this leads to an OverflowError. Therefore changing to an uint64 before the multiplication prevents this.