get_data_info() cannot output None during inference.

[Yining Shi]

I observe that some frames do not have all cameras synchronized during inference stage. And the validation fails if get_test_data() returns None. How to evaluate the whole frames for 23547 validation set?

[xhjiang]

We enlarge the threshold of cameras synchronizing to 100ms when creating data info, which is set as 25ms by AV2 official.