approximate.py 文件源码

def _to_hash(projected):
        if projected.shape[1] % 8 != 0:
            raise ValueError('Require reduced dimensionality to be a multiple '
                             'of 8 for hashing')
        # XXX: perhaps non-copying operation better
        out = np.packbits((projected > 0).astype(int)).view(dtype=HASH_DTYPE)
        return out.reshape(projected.shape[0], -1)