Rahul Gopinath

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Rahul Gopinath posted Mar 17, 2023

Valiant's general context free parser is one of the few very well known general context free parsers. Its claim to fame is that given any context-free grammar, it can parse any strings in that grammar in less than O(N^3) time, by leveraging advances matrix multiplication. Unfortunately, lucid explanations of what Valiant's algorithm does is somewhat hard to find. I have just written a live notebook post that explains the Valiant's parser, and lets you play with the algorithm directly.

https://rahul.gopinath.org/post/2023/03/16/valiant-parser/

#parsing #context-free

Rahul Gopinath posted Mar 16, 2023

An unforeseen (or perhaps foreseeable) issue; Most foot guns I have learned to avoid in Python are present in GPT4 generated code, and it is not immediately obvious anymore. Chased a surprising bug and found
C = [[{}] * m for _ in range(m)]
followed by
C[i][j][k] = "V"
buried deep. Because I trusted GPT4 (it aught to be good at these things) I failed to recognize this pattern :/

Rahul Gopinath posted Mar 16, 2023

It is very mesmerizing to get chatGPT+ (GPT4) to write code for you. It keeps making different mistakes every time, and inventing newer explanations!

Rahul Gopinath posted Mar 5, 2023

Experimenting with the new Bing (Sydney?), it seems that it has problems with citations still. In the below, all the links to the arxiv.org are the same paper I wrote some time back, and the one in research.org is also the same paper, albeit in a different cite.

Rahul Gopinath posted Feb 25, 2023

To those who are struggling with Microsoft's outlook, please give #mutt http://www.mutt.org/ a try. It works very well with outlook (beyond some configuration), has sane searching capabilities, and does exactly what you want it to do. I have been using it to survive email in #usyd.

Rahul Gopinath posted Dec 18, 2022

A few important tips for folks running #mastodon instances (also for people who run their own microbloging instances like #ktistec) https://denise.dreamwidth.org/91757.html

Rahul Gopinath posted Dec 10, 2022

Has any one gotten #chatGPT3 to do a literature survey correctly? It summarizes the research in many fields reasonably well, but it always makes up papers. I couldn't get it to cite even a single real paper.

Rahul Gopinath posted Dec 4, 2022

I am at SPLASH (Auckland) today; If you are there and would like to meetup, please drop me a note.

Rahul Gopinath posted Nov 30, 2022

For those in Australia, applying for #DECRA #ARCDECRA NIT will be now assessed by the assessors!

https://www.arc.gov.au/news-publications/media/media-releases/simpler-national-interest-test-nit-statement-will-help-researchers

Rahul Gopinath posted Nov 23, 2022

Should I use open or closed parenthesis in an inline list (1) like this or 2) like this? Is there any style guide on this? #english #writingstyle Does any one have any suggestions?