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Re87: The multimap Function, Part A
(Best-First-Search Part 6, AIMA4e pp. 73-74)

retraice.com

Unpacking the code that gets us the neighbors of our current state which are the actions available in the Romania problem.
The connections between Mapand multimap; hasattr; 'items'; adding reverse actions to our state space; neighbors, actions and multimap; probing objects with dir()and __dict__; causing side effects by calling a function from inside a class; debugging.

Air date: Monday, 19th Dec. 2022, 10:00 PM Eastern/US.

Map and multimap
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PIC
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Other sources consulted during this livestream:
* Russell & Norvig (2020);
* Retraice (2022/12/14);
* Retraice (2022/12/15);
* Retraice (2022/12/16);
* Retraice (2022/12/17);
* Retraice (2022/12/18);
* http://aima.cs.berkeley.edu/figures.pdf;
* https://github.com/aimacode/aima-python/blob/master/search4e.ipynb;
* https://github.com/retraice/ReAIMA4e/.

The side effects of multimap via Map on tlinks
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PIC
The bug was caused by the side effects of instantiating a Mapwhich called the stand-alone function multimapwhich modified our stand-alone dictionary tlinks.
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References

Retraice (2022/12/14). Re82: What is a problem? (BEST-FIRST-SEARCH Part 1, AIMA4e pp. 73-74). retraice.com.
https://www.retraice.com/segments/re82Retrieved 15th Dec. 2022.

Retraice (2022/12/15). Re83: A Problem Instantiated (BEST-FIRST-SEARCH Part 2, AIMA4e pp. 73-74). retraice.com.
https://www.retraice.com/segments/re83Retrieved 16th Dec. 2022.

Retraice (2022/12/16). Re84: A Node Instantiated (BEST-FIRST-SEARCH Part 3, AIMA4e pp. 73-74). retraice.com.
https://www.retraice.com/segments/re84Retrieved 17th Dec. 2022.

Retraice (2022/12/17). Re85: The Details (BEST-FIRST-SEARCH Part 4, AIMA4e pp. 73-74). retraice.com.
https://www.retraice.com/segments/re85Retrieved 18th Dec. 2022.

Retraice (2022/12/18). Re86: Code Reading (BEST-FIRST-SEARCH Part 5, AIMA4e pp. 73-74). retraice.com.
https://www.retraice.com/segments/re86Retrieved 19th Dec. 2022.

Russell, S., & Norvig, P. (2020). Artificial Intelligence: A Modern Approach. Pearson, 4th ed. ISBN: 978-0134610993. Searches:
https://www.amazon.com/s?k=978-0134610993
https://www.google.com/search?q=isbn+978-0134610993
https://lccn.loc.gov/2019047498