Some questions about the 'sidx' in the search function

[Fiiiiifi]

Your work is amazing! I would like to ask about the principle behind the calculation of 'sidx' in the search function. Is it used to filter out clustered points? And what criteria are used for selecting the anchor？ dis = (anchor.unsqueeze(0)-p.unsqueeze(1)).sqr().sum(-1).sqrt() min_idx, _ = jt.argmin(dis,-1)