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Representation Costs in Data Science: Foundations and the Quasi-Banach Spaces of Deep Neural Networks

arXiv.org Machine Learning

We develop a general framework for analyzing representation costs of parametric data-fitting methods through their parameter-space regularizers. From this abstract perspective, we define representation costs for arbitrary parametric models and reveal their induced (native) function spaces. This unifies recent function-space views of data-fitting methods. We also prove that many natural results hold in this abstract setting, including representer theorems for parametric methods on their native spaces. The framework also rigorously connects parametric methods with their equivalent nonparametric descriptions under sufficient overparameterization. Classical methods and their native spaces, such as kernel methods / reproducing kernel Hilbert spaces, wavelets / Besov spaces, and shallow neural networks / variation spaces emerge as special cases of our abstract framework. A byproduct of "axiomatizing" the study of representation costs is that we also immediately obtain new results for deep neural networks: For depth-$L$ feedforward ReLU networks, their induced native spaces are $p$-normable quasi-Banach spaces with $p = 2/L$. This reveals that the inductive bias of deep neural networks (as given by the representation cost) cannot be captured by norms for depths $L > 2$.


A probabilistic framework for online test-time adaptation

arXiv.org Machine Learning

This paper presents a probabilistic framework for online test-time adaptation problems. In them, a model is trained on labeled data but must adapt to unlabeled data at test time under the assumption that training and test distributions potentially differ, that is, there might have been a distributional shift. The framework is based on a state-space modelling architecture from which parameter learning, parameter time evolution, prior tuning, and prediction can be characterized.


No fuel, no sleep: Ukrainian strikes seek to cut off Crimea

The Japan Times

Smoke rises from Crimea Bridge on Monday. The Ukrainian army is pounding supply routes and striking energy facilities across Crimea. Warsaw - For Yulia, a 23-year-old resident of Crimea, nights have become sleepless due to increased Ukrainian drone attacks on the peninsula annexed by Russia in 2014. Kyiv's army is pounding supply routes and striking energy facilities across the Black Sea territory -- a campaign it sees as fair retribution for Moscow's daily barrages of Ukrainian cities, and one that it hopes will turn the tide of the four-year war in its favor. On Thursday, the Moscow-installed governor of Crimea announced power cuts across the peninsula, which despite the war had been a popular holiday destination for Russians. In a time of both misinformation and too much information, quality journalism is more crucial than ever.


Hidden earthquake threat discovered beneath California could unleash devastating magnitude 7 tremor

Daily Mail - Science & tech

Family secrets of Trump's closest White House aide: Natalie Harp's estranged socialist brother reveals ugly details of feud... and the tragedy that shattered everything Clay Aiken opens up about the'catastrophic' aftermath of grabbing Kelly Ripa's face live on air Iran's suicide drone strike on US ally threatens Trump's fragile peace in Strait of Hormuz Live, laugh, love mom charged with incestuous abuse of her two teenage adopted sons demands DIVORCE from handsome husband... as shocking custody request revealed Harry and Meghan may smugly believe the Establishment'plot' to return them is working. But they have no idea what Kate and William are thinking. My royal insiders have not held back... it's damning: RICHARD EDEN America's hottest housing market is a surprising East Coast city where 58% of homes sell above asking price Eva Longoria, 51, drops jaws in white string bikini as she displays gym-honed body during family beach day in Spain... after fleeing US Beloved Fox & Friends star says she's quitting after 22 years because of serious health condition Truth about Taylor Swift's'hookups' with ex Matty Healy... revealed by friends as his new model fiancรฉe is accused of kinky pre-wedding stunts to humiliate Swift I lost a stone in 28 days WITHOUT weight-loss jabs: At size 32, I couldn't bear being fat anymore. This old-fashioned diet got me holiday-ready in weeks... YOU can do it too with these 6 steps Eerie'apocalyptic' sounds heard on Mount Shasta lead horseback riders to bizarre discovery Angelina Jolie war with Brad Pitt over sale of lavish French wine estate turns in Brad's favor as secretive vodka billionaire buyer forced to testify Lavish photos show Mark Zuckerberg's secretive new $170m hideout: First look behind the guarded gates of billionaire's palatial bunker Lionel Richie, 77, 'taken to hospital by ambulance' after dizzy spell onstage saw him end concert An anniversary present from Harry? Duchess of Sussex debuts new ring - and royal fans say it looks very similar to Kate's engagement band Grotesque'zombie squirrels' with oozing flesh pods spark alarm across the US BRYONY GORDON: Have you been tempted by the'Ozempic of alcohol' pill? I certainly was, but I've since faced a humbling truth.


300-year-old shipwreck found near world's largest offshore wind farm

Popular Science

Environment Energy Renewables 300-year-old shipwreck found near world's largest offshore wind farm The three rare ingots discovered under 131-feet of water hearken back to England's former lead industry. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. The ingots featured lettered imprints similar to other artifacts dating to the 17th century. Breakthroughs, discoveries, and DIY tips sent six days a week. By signing up, you confirm you are 16+, will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy .


Ukrainian attack on Crimea kills five, Russian officials say

Al Jazeera

Is the war entering a new phase? At least five people have been killed in a Ukrainian attack on Russia and the Crimean peninsula as Kyiv steps up strikes, according to the Russian-appointed governor in the annexed region. Crimea Governor Sergey Aksyonov said two people, including a child, were killed and two others wounded following "overnight enemy attacks" into Thursday. Russia's defence ministry said 269 Ukrainian drones were downed over Russia and Crimea overnight. The head of the Krasnoarmeysk district in Krasnodar Krai said debris from a drone strike triggered an oil depot fire.


'Extremely Liberal': Trump Delivers First Verdict on Andy Burnham, Britain's Likely Next Prime Minister

TIME - Tech

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Democracy and the Declaration of Independence

TIME - Tech

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Apple hikes MacBook and iPad prices, blaming rising chip costs

BBC News

Apple is increasing the price of MacBooks and iPads worldwide due to rising memory and storage chip costs . The iPhone maker has hiked the prices of some laptops and tablets by almost 20%, saying the electronics industry is facing an unprecedented challenge due to an extraordinary surge in demand for chips to power AI data centres. We have never seen a component price increase this much, this quickly, the company said - adding it was working tirelessly to find solutions. While Apple has not included iPhones in its price increases for some devices, tech analyst Paolo Pescatore said it showed the AI boom was now affecting consumer electronics. Apple's price hikes follow a slew of firms increasing device prices to help them absorb rising hardware costs.


How to Safely Lower Your Body Temperature In Extreme Heat

TIME - Tech

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