Thanks, it doesnt have any effect.
Basically the paramters are converted into mkldnn, prior to instantiating a network and converting it to mkldnn as well.
if I simply dont do this, I get the error :

RuntimeError : Input type (Mkldnntorch.FloatTensor) and weight type (torch.FloatTensor) should be the same

then in order to fix this, I convert the parameters in advance, and then I face the errors I mentioned in my original question.