gemm function
        
Mat
gemm(
    
- InputArray src1,
- InputArray src2,
- double alpha,
- InputArray src3,
- double beta, {
- OutputArray? dst,
- int flags = 0,
Gemm performs generalized matrix multiplication.
For further details, please see: https://docs.opencv.org/master/d2/de8/group__core__array.html#gacb6e64071dffe36434e1e7ee79e7cb35
Implementation
Mat gemm(
  InputArray src1,
  InputArray src2,
  double alpha,
  InputArray src3,
  double beta, {
  OutputArray? dst,
  int flags = 0,
}) {
  dst ??= Mat.empty();
  cvRun(() => ccore.cv_gemm(src1.ref, src2.ref, alpha, src3.ref, beta, dst!.ref, flags, ffi.nullptr));
  return dst;
}