I am writing my masters thesis on Prediction of carbonation depth using ANN.

Input neuron include CaO, SiO2, Fe2O3, Mix design of concrete, RH, C02 conc, Temp. they are 18 neuron with different units.

my question is, which format of normalization (0 - 1) should be applied and why

1. normalizing columns independently using column

2. normalizing entire data set with one equation

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