in this tutorial, when to set up a fit approach,it require two matrix,one for input,and another for validation, why do this?
when to select the fit mode, the help only says to set the appropriate method, I do not understand this point. whether need I to select the fit method for each above matrix separately? at this point, I think it could not be like that,because the two matrix is in one fit process except we build two fit approachs.
for this step, I am frustrated.
wish to get some help, thanks in advance!