Mxnet symbol, for metric, how to get labels and preds from netowrk, from variable names or symbol names?

mxnet symbol, for metric, how to get labels and preds from netowrk, from variable names or symbol names?

In my symbol neural structure, I use mx,symbol.Group(loss1, loss2), when I change the metric loss1, loss2 also has been influenced. I do not know the reason. Any advice will be appreciated. Thank you very much.