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Authors Ferruccio Balestreri 🌈

7 days 30 days All time Recent Popular
Ferruccio Balestreri \U0001f308
Ferruccio Balestreri 🌈...
@0xferruccio
πŸ•΅οΈβ€β™‚οΈ How Google's PageRank algorithm works

The PageRank algorithm gives each page a rating of its
importance, which is a recursively defined measure of importance, based on if important pages link to it.
It's recursive because the importance of a page refers back to the importance of other pages that link to it

Here's how it works in practice:
1⃣ We start with some pages and crawl them for links


2⃣ Each page has 1/N points (where N as the total number of pages)


3⃣ Add points to each page for the amount of links to it, divided by the number
of links emanating from the sources of these links
TECH
Ferruccio Balestreri
Ferruccio Balestreri
@0xferruccio
πŸ§™β€β™‚οΈA magic ranking algorithm for news boards/upvote based communities
πŸ“ˆ Score = (u-1) / (t+2)^g
u = Upvotes (-1 to cancel out the point of the original submitter)
t = time
g = gravity (a gravitational constant, to make the post decay)
πŸ†Posts are ordered by Score

This was used in the first versions of Hacker News.
πŸ“‰ Here are some sample plots

And a @paulg comment that shows a lisp implementation of this
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