why the 'max_num_pts_per_box'

[Liaoqing-up]

https://github.com/Abyssaledge/TorchEx/blob/e5ff7fae27b5b6df74e6204dac45554ba85117a2/torchex/src/dynamic_point_pool/dynamic_point_pool_kernel.cu#LL297C41-L297C41
I'm confused about this variable and this code. Can you explain it? Thank you~

[Abyssaledge]

We limit the max number of points in each box to reduce the overhead, in case of an object containing too many points.
In the extreme case of Waymo Open Dataset, a large vehicle may contain up to 100000 points. However, on average, a vehicle often only contains hundreds of points.