Re76-NOTES.pdf

Notes by Retraice

English - December 11, 2022 06:49 - 1.87 MB application/pdf
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(The below text version of the notes is for search purposes and convenience. See the PDF version for proper formatting such as bold, italics, etc., and graphics where applicable. Copyright: 2022 Retraice, Inc.)

Re76: Gradients and Partial Derivatives Part 7
(AIMA4e pp. 119-122)

retraice.com

Moving the airport to improve its value.

Air date: Saturday, 10th Dec. 2022, 11:00 PM Eastern/US.

We're focusing on the math and code of AIMA4e^1 right now, December 2022.
This is in service of our plan to deep-dive the book from Jan.-Jun., 2023.
DISCLAIMER: The below mathematics cannot be trusted; it's a student's attempt, not an expert's.

Two more guesses, on the basis of gradient descent:
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PIC
Lucky-unlucky: There is exactly one line (y = x-7) on which placing an airport leads to the two partial derivatives being equal--and I placed the first airport on it. This lead to tens of minutes of doubt and disappointment, but ultimately I've become reasonably sure I understand the cause and that my calculations are correct.
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The hand-math:
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PIC
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The spreadsheet-math:
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The gradient descent tutorial I mentioned: https://realpython.com/gradient-descent-algorithm-python. We might come back and do this.

References

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

Footnotes

^1 Russell & Norvig (2020).