Created by: luotao1

We are adding MKLDNN data layout support and the design/implementation is on the way.

I have one question as below: Q: How to define/use GetKernelTypeForVar() in each OP? Currently it seems that no any OP overload it. Now it's used in framework (i.e. OperatorWithKernel::RunImpl) to detect whether data transorm is needed as below:

 expected_kernel_key = this->GetExpectedKernelType()
 for each input var:
    kernel_type_for_this_var = this ->GetKernelTypeForVar(var)
    if (TranFromNeeded(kernel_type_for_var, expected_kernel_key) {
        do transform....
    }

This question is from Liu, Brian in Intel.