this post was submitted on 25 Oct 2024
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Curated Tumblr

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For preserving the least toxic and most culturally relevant Tumblr heritage posts.

Image descriptions and plain text captions of written content are expected of all screenshots. Here are some image text extractors (I looked these up quick and will gladly take FOSS recommendations):

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Please begin copied raw text posts (lacking a screenshot that makes it apparent it is from Tumblr) with:

# This has been reposted here to Lemmy as part of the "Curated Tumblr Project."

I made the icon using multiple creative commons svg resources, the banner is this.

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[–] [email protected] 96 points 3 weeks ago (21 children)

What is up with the bird at the end?

[–] [email protected] 110 points 3 weeks ago* (last edited 3 weeks ago) (19 children)

A bot strips away all spaces and letters that aren't A, T, C or G, then treats the rest like a genetic sequence and checks it against some database.

Presumably, it runs through many terabytes of data for each comment, as the Gallinula chloropus alone has about 51 billion base pairs, or some 15 GiB. The Genome Ark DB, which has sequences of two common moorhens, contains over 1 PiB. I wonder if a bored sequencing lab employee just wrote it to give their database and computing servers something to do when there is no task running.

No, I won't download the genome and check how close the "closest match" is but statistically, 93 base pairs are expected to recur every 2^186^ bits or once per 10^40^ PiB. By evaluating the function (4-1)^m^ × mℂ93 ≥ 4^93^ ÷ (pebi × 8), one can expect the 93-base sequence to appear at least once in a 1 PiB database if m ≥ 32 mismatches or over ⅓ are allowed. Not great.

This assumes true randomness, which is not true of naturally occuring DNA nor letters in English text, but should be in the right ballpark. Maybe fewer if you account for insertions/deletions.

[–] [email protected] 70 points 3 weeks ago* (last edited 3 weeks ago) (12 children)

The FAQ on the user's page says:

  1. They are not a bot, just neurodivergent

  2. They're using BLAST

ie, this

https://blast.ncbi.nlm.nih.gov/Blast.cgi

They did not code anything beyond a very simple regex function that strips down posts to a t c g, and then they copy paste it into the above website, then copy paste the output.

Hell, you can see they aren't even removing apostrophes and quotes, not even forcing it to all lower case or all upper case, removing spaces and line breaks...

... as a former database admin/dev/analyst, I was losing my fucking mind at the notion that someone with direct access to a genomics DB, would just hook it up to tumblr, via an automated bot, and spam the db with non work related requests, all on their own, when they can barely modify a string correctly.

Thank fucking god this is just using a publicly available, no doubt extremely low fidelity, watered down search via an API.

... You need literal, state of the art, absurdly expensive, power hungry, and secure supercomputers to be able to do genomic comparisons.

Probably one of the dumbest things you could do, quickest way to get fired, and then never be able to work in the field again, would be for a random genomics lab worker who does not know how to code to open up a whole bunch of security holes and cost god knows how much money (and damage if you write bad code) running frivolous bs searches in their state of the art genomics db... for a tumblr bot.

[–] [email protected] 29 points 3 weeks ago (1 children)

Not a bot, just neuro

Hilarious every time.

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