grouping_operation function not expected result

[rhtm02]

First thx to your pointnet_ops_code in cpp, cuda. it so nice to me

in my case, i first use KNN function then return idx.

after that i use grouping_operation(xyz_trans, idx).

i think grouping_operation is grouping points in idx from xyz_trans , right? but to me the function didnt operated to me.

is there my fault?