tvm.target.Target warning

I run this scripyt https://tvm.apache.org/docs/how_to/tune_with_autotvm/tune_relay_mobile_gpu.html#sphx-glr-how-to-tune-with-autotvm-tune-relay-mobile-gpu-py on rk3399, however the console has this warning , it is diffcult for me to see the tuning process. I try python ignore warning methods and grep -v ,however this warning still appear . could anyone tell me the no warning parameter .

Hi, this warning means that at least one function api was given a target and target host instead of a target that has a target host as attribute. Would you please check the code for any usage of target host outside the scope of a target object?