warning("We did not found a dynamic library into the library_dir of the library we use for blas. If you use ATLAS, make sure to compile it with dynamics library.")
We execute this optimizer after the gemm optimizer. This allow to give more priority to gemm that give more speed up then this optimizer, but allow the gemm optimizer to ignore this op.
TODO: support when we can reorder the mul to generate a dot22scalar or fix the canonizer to merge them(1 mul with multiple inputs)