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Home Artificial Intelligence

Velocity up Pandas Code with NumPy. However I can’t vectorise this, can I?  …… | by Thomas Reid | Jan, 2025

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January 13, 2025
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However I can’t vectorise this, can I? …. sure, you in all probability can!

Thomas Reid

Towards Data Science

In one of many first articles I wrote on Medium, I talked about utilizing the apply() methodology on Pandas dataframes and stated it ought to be prevented, if doable, on bigger dataframes. I’ll put a hyperlink to that article on the finish of this one if you wish to test it out.

Though I talked then a bit about doable options, i.e. utilizing vectorisation, I didn’t give many examples of utilizing vectorisation, so I intend to treatment that right here. Particularly, I wish to discuss how NumPy and a few its lesser-known strategies ( the placeand choose) can be utilized to hurry up Pandas operations that contain complicated if/then/else situations.

Vectorisation within the context of Pandas refers back to the methodology of making use of operations to complete blocks of information directly relatively than iterating via them row by row or factor by factor. This strategy is feasible resulting from Pandas’ reliance on NumPy, which helps vectorised operations which can be extremely optimized and written in C, enabling sooner processing. Whenever you use vectorised operations in Pandas, corresponding to making use of arithmetic operations or capabilities to DataFrame or Sequence objects, the operations are dispatched to a number of information parts concurrently.

Tags: CodeJanNumPyPandasReidspeedThomasvectorise

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