videos 171 frames 25136 trials 2000
column           k  same in video  n_eff m=10  n_eff m=20  n_eff m=40
timeofday        3           100%           7          13          29
weather          4           100%           6          13          30
pedestrian       2            81%          55         101         209
opposite_lane    2            54%          11          24          49
traffic_light    2            53%          35          68         145
traffic          4            43%          19          38          78
vehicles         4             4%          24          50         104
sign             2             2%          54         103         212
mean frames in a batch: {10: 1469, 20: 2939, 40: 5879}