Create parallel version of GroupPrevDays transformer #64
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This PR adds a parallel version of GroupPrevDays transformer
Serial and parallel give same results :
But parallel is way slower. I suspect this due to the number of customers.
I created a new file with 1000 customer_id but it seems to me it takes way too long...
@pseudotensor could you please have a look at the code when you have the time ?
I may be missing something...