Making Pandas Fly (PyDataAmsterdam 2020)

Another variant of the recent talks, this one focuses on making Pandas faster by digging into NumPy, using my `dtype_diet` memory-saving tool and understanding what's going on with some of Pandas' low level functions. See https://ianozsvald.com/ for more.

Transcript

1. Making Pandas Fly (live from London) @IanOzsvald – ianozsvald.com Ian Ozsvald PyDataAmsterdam 2020
2.  Interim Chief Data Scientist  19+ years experience  Team coaching & public courses – Higher Performance! Introductions By [ian]@ianozsvald[.com] Ian Ozsvald 2nd Edition!
3.  All volunteers – go say thank you in #lobby  NumFOCUS benefits us all Thank the organisers! By [ian]@ianozsvald[.com] Ian Ozsvald
4.  Pandas – Saving RAM – Calculating faster by dropping to Numpy  Advice for “being highly performant” Today’s goal By [ian]@ianozsvald[.com] Ian Ozsvald
5.  Go to Notebook for demo Demo By [ian]@ianozsvald[.com] Ian Ozsvald
6. NumPy vs Pandas overhead (ser.sum()) By [ian]@ianozsvald[.com] Ian Ozsvald 25 files, 83 functions Very few NumPy calls! Thanks!
7. Overhead... By [ian]@ianozsvald[.com] Ian Ozsvald
8. Overhead with ser.values.sum() By [ian]@ianozsvald[.com] Ian Ozsvald 18 files, 51 functions Many fewer Pandas calls (but still a lot!)
9. Is Pandas unnecessarily slow? By [ian]@ianozsvald[.com] Ian Ozsvald Missing? The bottleneck library! This certainly helps
10. Is Pandas unnecessarily slow – NO! By [ian]@ianozsvald[.com] Ian Ozsvald https://github.com/pandas-dev/pandas/issues/34773 - the truth is a bit complicated!
11.  Install optional (but great!) Pandas dependencies – bottleneck – numexpr  Investigate https://github.com/ianozsvald/dtype_diet  Investigate my ipython_memory_usage (PyPI/Conda) Being highly performant By [ian]@ianozsvald[.com] Ian Ozsvald https://pandas.pydata.org/pandas-docs/stable/user_guide/enhancingperf.html
12.  Mistakes slow us down (PAY ATTENTION!) – Try nullable Int64 & boolean, forthcoming Float64 – Write tests (unit & end-to-end) – Codify your assumptions – bulwark library – https://github.com/ianozsvald/notes_to_self Being highly performant By [ian]@ianozsvald[.com] Ian Ozsvald
13.  Make it right then make it fast  Think about being performant  See blog for my classes  I’d love a postcard if you learned something new! Summary By [ian]@ianozsvald[.com] Ian Ozsvald
14. Covid 19 UK economic impact? By [ian]@ianozsvald[.com] Ian Ozsvald