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A team from MIT and the Woods Hole Oceanographic Institution (WHOI) has developed an image-analysis tool that cuts through the ocean's optical effects and generates images of underwater environments that look as if the water had been drained away, revealing an ocean scene's true colors. The team paired the color-correcting tool with a computational model that converts images of a scene into a three-dimensional underwater "world," that can then be explored virtually.

The researchers have dubbed the new tool SeaSplat, in reference to both its underwater application and a method known as 3D Gaussian splatting (3DGS), which takes images of a scene and stitches them together to generate a complete, three-dimensional representation that can be viewed in detail, from any perspective.

For now, the method requires hefty computing resources in the form of a desktop computer that would be too bulky to carry aboard an underwater robot. Still, SeaSplat could work for tethered operations, where a vehicle, tied to a ship, can explore and take images that can be sent up to a ship's computer.

[-] NoSpotOfGround@lemmy.world 3 points 2 days ago

So this looks like the closer the server, the less efficient (more convoluted) the path to it is. Very cool.

[-] NoSpotOfGround@lemmy.world 4 points 3 days ago

Image is blocked. Try downloading and uploading it to lemmy instead of hotlinking to reddit perhaps.

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[-] NoSpotOfGround@lemmy.world 50 points 1 week ago

I think "blitzkrieg" matches somewhat: don't stop to engage every stronghold, just drive around them, isolate them, and cut off their support networks.

135

Although the theory is promising, the duo point out that they have not yet completed its proof. The theory uses a technical procedure known as renormalization, a mathematical way of dealing with infinities that show up in the calculations.

So far Partanen and Tulkki have shown that this works up to a certain point—for so-called 'first order' terms—but they need to make sure the infinities can be eliminated throughout the entire calculation.

"If renormalization doesn't work for higher order terms, you'll get infinite results. So it's vital to show that this renormalization continues to work," explains Tulkki. "We still have to make a complete proof, but we believe it's very likely we'll succeed."

99

Why is the spring strengthened in the middle?

It doesn't seem to affect the spring's buckling characteristics.

My speculation is that it's to reduce spring noise. That strengthened region at the middle is where the spring will buckle outwards most, resting against the barely visible side rails on the inside of the case. Instead of just one wobbly contact point it now has three rigid ones as a "skate" to reduce the stick-slip noise when opening and retracting the tip. Is this right?

(The pen is a Mitsubishi Uni-Ball Power Tank, pretty much my favorite model.)

[-] NoSpotOfGround@lemmy.world 109 points 4 weeks ago

In Soviet America, a wrong turn takes your life.

[-] NoSpotOfGround@lemmy.world 252 points 1 month ago* (last edited 1 month ago)

The real meat of the story is in the referenced blog post: https://blog.codingconfessions.com/p/how-unix-spell-ran-in-64kb-ram

TL;DR

If you're short on time, here's the key engineering story:

  • McIlroy's first innovation was a clever linguistics-based stemming algorithm that reduced the dictionary to just 25,000 words while improving accuracy.

  • For fast lookups, he initially used a Bloom filter—perhaps one of its first production uses. Interestingly, Dennis Ritchie provided the implementation. They tuned it to have such a low false positive rate that they could skip actual dictionary lookups.

  • When the dictionary grew to 30,000 words, the Bloom filter approach became impractical, leading to innovative hash compression techniques.

  • They computed that 27-bit hash codes would keep collision probability acceptably low, but needed compression.

  • McIlroy's solution was to store differences between sorted hash codes, after discovering these differences followed a geometric distribution.

  • Using Golomb's code, a compression scheme designed for geometric distributions, he achieved 13.60 bits per word—remarkably close to the theoretical minimum of 13.57 bits.

  • Finally, he partitioned the compressed data to speed up lookups, trading a small memory increase (final size ~14 bits per word) for significantly faster performance.

[-] NoSpotOfGround@lemmy.world 40 points 1 month ago

There was something wrong here, but the... right kind of wrong.

Looking back, those times were an incredible desert of of titillation compared to the desserts of today.

1226
submitted 3 months ago* (last edited 3 months ago) by NoSpotOfGround@lemmy.world to c/technology@lemmy.world

Tesla Cybertruck appears to be facing significant sales challenges. After initial hype faded, and over a million reservations turned out to be as real as unicorns, Tesla is now enabling leasing options and free upgrades to move its inventory of the futuristic pickup truck. The company's recent silence on the Cybertruck, even omitting it from their earnings call, speaks volumes about the situation.

Tesla initially projected sales of 500,000 Cybertrucks annually and established production capacity at the Giga Texas for 250,000 units per year. After working through the initial reservation backlog with fewer than 40,000 deliveries, the automaker is now struggling to sell the remaining vehicles.

[-] NoSpotOfGround@lemmy.world 65 points 3 months ago* (last edited 3 months ago)

Text below, for those trying to avoid Twitter:

Most people probably don't realize how bad news China's Deepseek is for OpenAI.

They've come up with a model that matches and even exceeds OpenAI's latest model o1 on various benchmarks, and they're charging just 3% of the price.

It's essentially as if someone had released a mobile on par with the iPhone but was selling it for $30 instead of $1000. It's this dramatic.

What's more, they're releasing it open-source so you even have the option - which OpenAI doesn't offer - of not using their API at all and running the model for "free" yourself.

If you're an OpenAI customer today you're obviously going to start asking yourself some questions, like "wait, why exactly should I be paying 30X more?". This is pretty transformational stuff, it fundamentally challenges the economics of the market.

It also potentially enables plenty of AI applications that were just completely unaffordable before. Say for instance that you want to build a service that helps people summarize books (random example). In AI parlance the average book is roughly 120,000 tokens (since a "token" is about 3/4 of a word and the average book is roughly 90,000 words). At OpenAI's prices, processing a single book would cost almost $2 since they change $15 per 1 million token. Deepseek's API however would cost only $0.07, which means your service can process about 30 books for $2 vs just 1 book with OpenAI: suddenly your book summarizing service is economically viable.

Or say you want to build a service that analyzes codebases for security vulnerabilities. A typical enterprise codebase might be 1 million lines of code, or roughly 4 million tokens. That would cost $60 with OpenAI versus just $2.20 with DeepSeek. At OpenAI's prices, doing daily security scans would cost $21,900 per year per codebase; with DeepSeek it's $803.

So basically it looks like the game has changed. All thanks to a Chinese company that just demonstrated how U.S. tech restrictions can backfire spectacularly - by forcing them to build more efficient solutions that they're now sharing with the world at 3% of OpenAI's prices. As the saying goes, sometimes pressure creates diamonds.

Last edited 4:23 PM · Jan 21, 2025 · 932.3K Views

[-] NoSpotOfGround@lemmy.world 57 points 4 months ago

That they're all having sex in a spontaneous orgy. It's... weird.

3

Imagine you were reborn as a female queen ant with an expected lifespan of about 15 years (worker ants live about half a queen's timespan), and had the ambition to make the most of your tiny new life. And you got to keep your current intellectual capacity and knowledge.

How much could you achieve as an ant?

[-] NoSpotOfGround@lemmy.world 40 points 7 months ago

There is no such thing as a pineapple tree. That's an AI image.

Pineapples grow in an even more ridiculous way.

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The way our bodies react to mosquito saliva motivates us to avoid being bitten. Which must have had evolutionary benefits, keeping us away from diseases.

I.e. all those people that didn't mind them and never got itchy from mosquito bites appear to have died out. And mosquitoes really wish that wasn't true.

[-] NoSpotOfGround@lemmy.world 165 points 9 months ago

It also propels itself forward by discharging high velocity watermarks.

[-] NoSpotOfGround@lemmy.world 69 points 11 months ago* (last edited 11 months ago)

Citing measurements made at the 1926 Iowa State Fair, they reported that the peak power over a few seconds has been measured to be as high as 14.88 hp (11.10 kW) and also observed that for sustained activity, a work rate of about 1 hp (0.75 kW) per horse is consistent with agricultural advice from both the 19th and 20th centuries [...]

Sounds to me like the 1 hp unit is fair, after all.

[-] NoSpotOfGround@lemmy.world 109 points 1 year ago

I doubt it, that would be too much of a coincidence to have two people named Torvalds in one picture.

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NoSpotOfGround

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