simple_test_{online, offline} difference

[Lewis-Lu]

Hi,

what's the purpose of distinguish these two functions with judging the world_size ?

Best, Lewis

[afterthat97]

SparseBEV takes 8 consecutive frames as input.

• simple_test_online assumes that the frames are loaded in sequence, and we save the image features into a memory queue (or cache), so that the features of previous frames can be reused. However, it relies on sequential loading and only works on single GPU (world_size == 1).

• simple_test_offline doesn't make such assumptions and extract the features of all 8 frames for each time. It works on both single/multiple GPUs, but it is slower than simple_test_online.

• When measuring FPS, we use simple_test_online as it is the common practice.

[Lewis-Lu]

Thanks~, it matches with my guess and the code.

Best, Lewis