fix FP16 bug of track_id annotation, ReID related #184
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When training with FP16, annotations of bbox and track_id named as
targetswill be set to torch.float16 from torch.float32.But actually, track_id annotations will lose their precision during this procedure, resulting wrong labels for ReID module.
So with the wrong labels, ReID module can not be trained normally, getting extreme low mAP and top-k ranking in person search benchmarks.
After fixing this bug, we can get normal results.