Sorry for late response.
It seems your GPU’s compute capability is only 5.0, it may not support FP16 mode.
You can go to this page to get some information about NVIDIA’s FP16 supports.
Have you tried FP32 mode?
Simply change network-mode from 2 to 0.
# 0=FP32, 1=INT8, 2=FP16 mode
network-mode=2 # Change this to 0