question about mipnerf360 pose

[yuemingPAN]

Thank you for your excellent work about the NeRF factory! The code is functioning well, and I have some questions regarding the pose processing in Mip-NeRF 360. I was hoping you could help me better understand it. Thank you very much!
I would like to inquire about the purpose of this line of code,

nerf-factory/src/data/data_util/nerf_360_v2.py

Line 364 in ce06663

poses = np.concatenate([poses[:, 1:2, :], -poses[:, 0:1, :], poses[:, 2:, :]], 1)

which appears to reverse the first column of the pose matrix and swap its order with the second column, but I am not sure the purpose of this transformation.