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Training set ordering matters??
i'm pretty new to rapidminer and data mining in general and i wanted to talk about a strange behavior i'm seeing with rapidminer 5.0 beta:
as you can see from the screenshot, i am fetching a training set from a mysql database and passing it to a neuronal network. so far war so good.
you can see the training set in the other screenshot:
it is labeled with a value between 0 and 1, which should be predicted afterwards. now the strange thing: i've copy&pasted the training set sql-query from somewhere else and at the end there was still a "ORDER BY `label` DESC". i thought this was rather useless (i am not limiting the number of sql results), so i removed the ORDER BY clause. but that made my prediction worse! far worse! i could not belive it, so i reproduced it many times...
can somebody tell me, why the neuronal network depends on the ordering of its training set and why it is better with DESC than with ASC?