One of the forward convolution algorithms is FFT convolution in cuDNN. FFT convolution is called by setting algo parameter of type cudnnConvolutionFwdAlgo_t of cudnnConvolutionForward API to CUDNN_CONVOLUTION_FWD_ALGO_FFT.
My question is how does cuDNN call cuFFT function? I am not sure if cuDNN uses cuFFT as its FFT implementation. Or cuDNN uses a different FFT implementation other than cuFFT.
Since cuDNN is a closed source library, I cannot find any references on this topic.
Can anyone shed light on this question. Thank you.
For a better exposure, I crosspost here: https://devtalk.nvidia.com/default/topic/1048771/cuda-programming-and-performance/how-does-cudnn-call-fft-function-/