Not Getting all classes

[pgupta119]

Hi Team , I am using the honda dataset which has 12 classes : ["background", "intersection passing", "left turn", "right turn", "left lane change", "right lane change", "left lane branch", "right lane branch", "crosswalk passing", "railroad passing", "merge", "U-turn"]

When I am trained and getting results the mAP/AP table missing the last label (class):

background: nan intersection passing: nan left turn: na right turn: nan left lane change: nan right lane change: nan left lane branch: nan right lane branch: nan crosswalk passing: nan railroad passing: nan merge: nan

Why it doesn't show the U-turn class