plot the loss surface (BCE and MSE)for a two layers neural network
importnumpyasnpimportmatplotlib.pyplotaspltfrommpl_toolkits.mplot3dimportAxes3Ddefmlp_layer(x,w,b=0,activate="tanh"):ifactivate=="tanh":returnnp.tanh((w.transpose())*x+b)elifactivate=="sigmoid":return