How to extend to multiple classes

[iamsosadwwww]

I added categories ：class_names =['Car','Pedestrian','Cyclist']，But the result is all 0
Can you give more detailed steps?
I will be very grateful

validation_loss: 0.7230802797227321
generate label finished(24.77/s). start eval:
Car AP@0.70, 0.70, 0.70:
bbox AP:0.00, 0.00, 0.00
bev AP:0.00, 0.00, 0.00
3d AP:0.00, 0.00, 0.00
Car AP@0.70, 0.50, 0.50:
bbox AP:0.00, 0.00, 0.00
bev AP:0.00, 0.00, 0.00
3d AP:0.00, 0.00, 0.00

Car coco AP@0.50:0.05:0.95:
bbox AP:0.00, 0.00, 0.00
bev AP:0.00, 0.00, 0.00
3d AP:0.00, 0.00, 0.00