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Create ID over an abnormal sequence

I have the following code that samples 1 row 5 times, 2 rows 5 times, 3 rows 5 times and so on.. after running the lapply and converting it to a
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Apply function to two columns Pandas

I'm trying to apply a function that calculates the r2 score to two columns of a pandas data frame. it works if first i group by some other column

Faster alternative to iterrows

I know that this topic has been addressed a thousand times. but i can't figure out a solution. i'm trying to count how often a list (each
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