Fix hamming distance test

[C0rWin]

No description provided.

[ankane]

Hi @C0rWin, check out #508.

[C0rWin]

Hi @C0rWin, check out #508.

I might be missing something, but master still has this issue:

ann-benchmarks/ann_benchmarks/distance.py

Line 30 in 75043ab

distance=lambda a, b: np.mean(a.astype(np.bool_) ^ b.astype(np.bool_)),

[ankane]

That code is correct for the benchmarks to show the correct recall with the hosted datasets (see the linked issue or test it yourself).