I developed neural network model using neuralnet package in R. But I wanted to use MAPE (mean absolute percentage error) as the error funcion. I tried using the way given in one of the posts, but it shows me this error. Please help me!!!
nn=neuralnet(var1~var2+var3+var4+var5+var6+var7+var8+var9+var10+var11,voter.data, hidden=0,rep=10,err.fct = custom)
Error in crossprod(neurons[[length.weights]], delta) :
non-conformable arguments
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