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For this exercise, you will be using parallel computing to apply the function take_mean_age() that calculates the average athlete's age in a given year in the Olympics events dataset. The DataFrame athlete_events has been loaded for you and contains amongst others, two columns:

Year: the year the Olympic event took place
Age: the age of the Olympian

You will be using the multiprocessor.Pool API which allows you to distribute your workload over several processes. The function parallel_apply() is defined in the sample code. It takes in as input the function being applied, the grouping used, and the number of cores needed for the analysis. Note that the @print_timing decorator is used to time each operation.

Complete the code, so you apply take_mean_age with 1 core first, then 2 and finally 4 cores.

Exercise

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