why i test on train data, the result is very bad? and i test on test data, the result is good? i'm confused.

[gebinfu]

this is one of my test on 3dmatch that using train data to test. the result is bad?

i use pcd0: train/sun3d-hotel_sf-scan1_2/cloud_bin_82 and pcd1: train/sun3d-hotel_sf-scan1_2/cloud_bin_54.

[[ 0.6844028 -0.6599496 -0.3105167 0.1642589 ]
[ 0.71676284 0.6865813 0.12245786 -0.60712457]
[ 0.13226157 -0.3061826 0.9426269 -0.07236266]
[ 0. 0. 0. 1. ]]
[[-0.70786548 0.41606407 -0.57080833 1.21529803]
[-0.43809581 0.37529742 0.81684017 -1.488495 ]
[ 0.55407832 0.82828266 -0.08338126 1.23596038]
[ 0. 0. 0. 1. ]]
RRE(deg): 153.964, RTE(m): 1.896

Process finished with exit code 0