Do we have tests for fp16 convolution? cc @zihaomu

Yes, we have the FP16 accuracy test, which has the flag of DNN_TARGET_CPU_FP16.

Yes, we have the FP16 accuracy test, which has the flag of DNN_TARGET_CPU_FP16.

opencv/modules/dnn/test/test_onnx_importer.cpp

Line 2352 in 52f3f5a

if (target == DNN_TARGET_OPENCL_FP16 || target == DNN_TARGET_MYRIAD || target == DNN_TARGET_CPU_FP16)

It is turned off by default: https://github.com/opencv/opencv/actions/runs/8200307720/job/22436426876?pr=25184#step:17:12821. Tests for a single convolution layer on fp16?

https://github.com/opencv/opencv/actions/runs/8200307720/job/22436426876?pr=25184#step:17:12955, the default is ON, and for some specific cases we turned it off since the accuracy issue was introduced by FP16.

@fengyuentau, @zihaomu, does it make sense to verify that this PR will pass on 5.x branch too?

@dkurt You may create yet another PR to 5.x with the same change. I'll merge it independently.