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batch_transform correction

Hi guys,

I am new here - so First, this place is sooo Awesome! though I couldn't really erealize why so many great economic algo's are throwed away ?...

My Q is, when I clone some Algo from some old post, and I try to backtest the Algo after minor changes, is says that "Batch_transform" must be switched with "history()".

well... I can't do that switch. can someone pls guide me?
here is an example:

@batch_transform(window_length=performance_lookback)
def accumulateData(data):
return data

In addition, It'll be super - cool to get all of the lectures/articles/anything to see or read in order to be at my top fit to Quantopain.

Thanks,

-Naor