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yantrams

530 karma · joined March 14, 2014

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yantrams··on Ask HN: What's the best documentation you've ever read?
MDN, Scikit-learn, Requests, RethinkDB, Django are a few that come to my mind.
yantrams··on Dealing with Hard Problems (2015)
Wonderful write up. Thanks for the share.
yantrams··on Dealing with Hard Problems (2015)
Wow. Thanks for sharing that piece of trivia! Now I get what this song from 1981 - The fish needs a bike by Blurt - was referring to. I always thought it was a reference to some surrealist work or something :)

https://www.discogs.com/Blurt-The-Fish-Needs-A-Bike/release/...

yantrams··on Dealing with Hard Problems (2015)
This works well for me too :) Specifically when I am going to sleep. Recently, I spent a couple of days working on "tight paving/tiles" problem from Knuth's Christmas Lecture ( https://www.youtube.com/watch?v=BxQw4CdxLr8 ) and surprised myself when I managed to exhaustively enumerate all valid arrangements(around 40 I think) for some small configuration while lying on the bed at night, something that I never thought I could do without a pen and paper.
yantrams··on Dealing with Hard Problems (2015)
Taking a break from sitting at the desk and going for a walk and thinking about the problem has worked surprisingly well for me many times. It was something I first read about in a Poincare's article on how Mathematical ideas are generated.

Coming to general methods of problem solving in recreational math, I always look for symmetry and transforming the problem from one problem space to another and induction techniques before attacking it. For a research/modelling problem, my approach is to start working on the most simplified version of it and gradually progress towards the original problem.

There is an excellent numberphile video on Josephus problem that illustrates how examining specific instances to observe patterns can help solve the general case.

https://www.youtube.com/watch?v=uCsD3ZGzMgE

Edit: Formatting

yantrams··on Free Music Archive
Really glad to have stumbled upon this. Brilliant collection. Also, I'm happy to see that the Last.fm scrobbler I use works seemlessly with this. https://github.com/web-scrobbler/web-scrobbler
yantrams··on Free Music Archive
I am a huge fan of KEXP channel on Youtube. Discovered many wonderful postpunk/experimental/alternative bands thanks to them. Glad to see someone share the sentiment.
yantrams··on ‘My Hovercraft Is Full of Eels’ in Many Languages
This got me thinking about what an appropriate word for hovercraft in Sanskrit could be. Sarva-Madhyama-Plavaka maybe? Translates to something that jumps/glides over all media.

Edits: Grammar

yantrams··on The Quantum Pascal's Triangle (2002)
Just signed up. The community looks wonderful and I'm really looking forward to participate and learn. Thanks again for the share.

Cheers

yantrams··on The Quantum Pascal's Triangle (2002)
Thanks for the share. I've been meaning to study category theory for a while now. This course and the suggested literature looks really helpful.
yantrams··on The Quantum Pascal's Triangle (2002)
Really glad to have stumbled upon this. The author's homepage at http://math.ucr.edu/home/baez/ appears to be a treasure trove of interesting mathematical tidbits.
yantrams··on Was there a civilization on Earth before humans?
I should've phrased it better. I meant masquerading fictional scientists as real scientists.

And yes based on my understanding of science, Newton was a scientist and so were the undocumented pioneers who tinkered with what they had available at the time. Be it the wandering ascetics from India who studied the effects of various herbs on humans to compile treatises on medicine like Ayurveda or the priests and traders from Babylonia who arrived at mathematical results based on heuristic principles, in my worldview, they are all scientists.

yantrams··on Was there a civilization on Earth before humans?
You spoke my mind. I was just about to compare it with EEE. It has been the modus operandi for the spread of what we now call Hinduism in the Indian subcontinent.

Here is an example of that happening in the 21st century. Classic case of appropriating indigenous dieties.

> It all started in March 2015, when their simple pole-hut shrine for Dokri Burhi (earth goddess) was taken over by a saffron-coloured, tiled, electrified and gated Hindu temple for Kanaka Durga. And in accordance with Brahmin beliefs, all Shudras were barred from it. This is when the local Shudras woke up to the pattern. Almost 150-200 years ago, when a handful of Brahmin families migrated to Ichchapur, they started dislodging the Shudras, who were the original inhabitants, from their ancestral lands. As time passed, Brahmins took control of most of the land, despite the lower castes comprising the majority of the village’s population. In fact, currently, there are 22 Brahmin families in Ichchapur and about 250 odd lower caste households.

https://thewire.in/film/caste-dalit-uprising-in-odisha

yantrams··on Was there a civilization on Earth before humans?
Sure. I'll have to dig up the literature but I'd be happy to do so. Can you be more specific ?

If you are interested in investigating, It'd be illuminating to contrast the belief systems in Vedas and Puranas. (Rigveda and Puranas to be more specific. ) If my memory serves right, Narayana(Vishnu) was a minor diety in Rigveda whose only claim to fame was carrying Indra on his back to circumnavigate the universe 108 times. He gradually started gaining more prominence as time passed, as a benevolent and sophisticated alternative to replace the more belligerent/primitive Indra. By mid 15th century(I could be wrong), this process was complete, with Vishnu taking over Indra completely, as established in that Govardhanagiri tale where Indra was utterly humiliated by Krishna.

Coming to the claims on Buddhism, once again, examining the Rigvedic and post Rigvedic belief systems can help you hypothesize how things unravelled. (Replacement of Horse with Cow as the sacred animal, renouncement of non vegetarianism, incorporation of Tantric belief systems etc ) Destruction of Buddhist monasteries and massacring the monks is quite well documented too. Read about Pushyamitra Sunga for example.

Edit: Typos

yantrams··on Was there a civilization on Earth before humans?
> scientists of their time

Please don't masquerade mythologocal saints/yogis as scientists. You are doing a disservice to the accomplishments of real historical figures like Panini, Brahmagupta etc by making statements like this. You don't have to resort to mythological characters to feel good about the supposed glorious past.

I can understand how the tales of Dasavataras can possibly have some allegorical references to evolution but claiming the rishis to be scientists only serves to further ridiculous beliefs like Quantum Mechanics and Relativity originated from Vedas, Rishi scientists developed nuclear weapons in 10000 BC etc.

The main purpose they(Puranas (post-vedic Hindu mythology)) served was to legitimize the Vishnu cult, get rid of the pantheon of older Vedic gods (Indra etc.) and to counter the rise of Buddhism. Most of these stories were made up ad hoc to suit the purposes of their times. I find them quite clever to be honest and fascinating from literary and sociological perspectives.

Take Buddha for example. Once Buddhism and its crusade against animal slaughter / rituals became a hit with the masses and started competing with Brahmanism/Sanatan Dharma/Hinduism, Buddha was made an incarnation of Vishnu and added to the Purana bloatware, while simultaneously obliterating Buddhist monasteries and driving it out of the subcontinent.

yantrams··on I miss Windows Phone
I had a Nokia N9 that shipped with the ill fated Meego OS. Hands down the smoothest operating system I've ever used on a mobile.
yantrams··on Tom Lehrer at 90: a life of scientific satire
Discovered his works in college while rummaging the internet for the book 'In Search of Beauty' on Non Euclidean Geometry. The Lobachevsky song is one the funniest songs I ever heard.

Link to the book for anyone looking for a light hearted reading on the history of Non Euclidean Geometry https://mirtitles.org/2013/04/30/in-the-search-for-beauty-sm...

yantrams··on Ask HN: Resources to learn real analysis?
I'd highly recommend picking up 'Understanding Analysis' by Stephen Abbott for self study. Beginner friendly and easy to digest yet rigorous. I can't think of a specific strategy but trying to visually understand the core concepts like convergence, continuity etc could be of help.
yantrams··on In Search of Proofs from “The Book”
Ah yes, thanks for correcting me :)
yantrams··on In Search of Proofs from “The Book”
Brilliant book that. The way he explains how a polished rigorous proof hides the process(compared with frontend and kitchen views of a restaurant) by which a mathematician has arrived at it changed my perception of how mathematics is done.

I notice the same phenomena in programming too. The final piece of code that works doesn't reflect all the failed attempts at solving a problem. This is why I tend to not delete/clear cells at all from my jupyter notebooks. :) It is always informative/fun to refer to them at a later point in time to relive that problem solving experience.

PS: In case you haven't, you should try Proofs and Refutations by Lakatos.

Edit: Fixed name of the book mentioned and added some text.

yantrams··on In Search of Proofs from “The Book”
This book is a must have for anyone who loves Mathematics or problem solving in general. You'll find many celebrated problems attacked using concepts from seemingly disparate domains.
yantrams··on Show HN: RoughJS – Create hand-drawn graphics using JavaScript
This has made me so much happy. Thank you. Brilliant stuff. I've been looking for something that does this and have just started having fun with this problem using P5.js and playing around with splines, perlin noise etc.
yantrams··on The Poignant Gulag Art by Stalin’s Doomed Meteorologist
Sad and touching story. His illustrations remind me of the Soviet children's books[0] I grew up with as a kid.

0 http://linkdot.link/sooviytt-prcurnnlu-childrens-books.html

yantrams··on Show HN: Find Similar Logos by Image and Website
Implemented now :) Feel free to browse around. http://compute.vision/logo-results.html?hash=P5RT9Q0RUJZ4P6Y...

Your constructive feedback has given me the idea to explore degrees-of-separation-between-two-logos feature, something I'll hopefully implement in a couple of days. Thanks again for taking time to check this out.

yantrams··on Show HN: Find Similar Logos by Image and Website
Thank you and yes indeed. This, coupled with rotation invariance is ideal for design/trademark/logo infringement detection scenarios. This result for example is against the Indian Trademark database https://imgur.com/gallery/SIAwl For photos, there's Tineye of course. Color similarity was trivial and took less than 10 lines of code but the shape similarity metric turned out to be quite challenging and took me months to get a reasonably working version. Most of the methods suggested in literature worked wonderfully against MPEG 7 dataset - http://www.dabi.temple.edu/~shape/MPEG7/dataset.html - (Few of them got a precision of almost 8 out of top 10 results!) but fared miserably with large datasets of real world designs.
yantrams··on Show HN: Find Similar Logos by Image and Website
That's a neat idea. Thank you. I was thinking of putting search functionality in the results page too so that it will save a click and display names of the brands but this is better. Makes it more fun to explore for the users.

I implemented this with the Indian Trademarks database with the purpose of helping brands detect obvious infringements of design to begin with. It worked reasonably well but the database comprised mostly wordmarks(text images) and badly compressed/scanned images so the results were kinda underwhelming, except for the popular brands. So I figured I should acquire a better graphics dataset to validate my algorithm and went ahead with it. The results turned out to be much better than the earlier dataset and I thought why not use this to make a fun tool and ended up doing this. I'm hoping this turns out to be a useful research tool for logo designers.

yantrams··on Show HN: Find Similar Logos by Image and Website
Fixed now. Also added a spinner gif while processing the request. Really appreciate your feedback. Feel free to let me know if you feel anything else is lacking. I am a math guy primarily who rarely ventures out of his jupyter-notebook comfort zone but thanks to this project I learned a good bit of frontend hacking. Cheers.
yantrams··on Show HN: Find Similar Logos by Image and Website
Thanks for the feedback. Appreciate it. I will take care of these issues. Would love to know what you thought about the quality of results in general.

Cheers

yantrams··on Xanadu
Longform article on the history of Xanadu - https://www.wired.com/1995/06/xanadu/
yantrams··on Ken's Academy Award: Noise and Turbulence
For those who are looking for a more detailed understanding of the algorithm and the choice of functions involved, I recommend http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise....
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