Fitted Q-evaluation (FQE) is a central method for off-policy evaluation in reinforcement learning, but it generally requires Bellman completeness: that the hypothesis class is closed under the evaluation Bellman operator. This requirement is challenging because enlarging the hypothesis class can worsen completeness. We show that the need for this assumption stems from a fundamental norm mismatch: the Bellman operator is gamma-contractive under the stationary distribution of the target policy, whereas FQE minimizes Bellman error under the behavior distribution. We propose a simple fix: reweight each regression step using an estimate of the stationary density ratio, thereby aligning FQE with the norm in which the Bellman operator contracts. This enables strong evaluation guarantees in the absence of realizability or Bellman completeness, avoiding the geometric error blow-up of standard FQE in this setting while maintaining the practicality of regression-based evaluation.

Russia releases video allegedly showing Ukrainian drone wreckage from a failed attack on President Vladimir Putin's residence, but Ukraine dismisses claims as fabrication.

The U.S. State Department reissued its Russia travel warning as the Ukraine conflict intensifies, telling U.S. citizens to leave immediately due to detention risks and limited embassy help.

'Super' virus spreading uncontrollably... as New York sees most flu cases ever and experts warn'we don't know when it will stop' Behind-the-scenes snaps from Kimberly Guilfoyle's magazine shoot look VERY different than the published photos Trump's HHS halts child care funding to ALL states after viral video sparks Somali daycare scandal in Minnesota She wore the ultimate revenge dress after their brutal break up. But Nashville's hottest couple is'trying again'... and her friends are terrified MARK HALPERIN blows apart the Minnesota scandal... and reveals who will pay the ultimate price Marla Maples' chilling Epstein warning as she feared his growing sway over Trump Megyn Kelly names'meanest' celebrities... and hints NBC's twinkly-eyed TV grandpa is not as nice as he seems Democrat mayor blasted for sneaking through reparations plan'in dark of night' that could see city's black residents handed $5m each Leonardo DiCaprio flaunts weight loss for much-younger girlfriend... but chooses very middle-aged accessory I tried the $12 'miracle' hangover cure... but I made a critical mistake that left me full of regret Snitch reveals all the gossip from inside the New England Patriots after Stefon Diggs allegedly'strangled' his female chef St Barts regulars complain paradise island is'tacky' and overrun with vulgar yachts blocking ocean views as A-Listers and billionaires flock there for annual New Year's Eve celebrations My husband set me a kinky New Year's resolution... DEAR JANE, I'm disgusted. But I'm afraid I can't say no'Work maintained my sense of self': How one woman's cancer journey inspired her company to give back New York City mayor-elect Zohran Mamdani is set to ring in his inauguration with a public block party open to residents on January 1. But alongside the celebration, the Democratic socialist has also released a lengthy list of items barred from the event, some expected, others raising eyebrows. While weapons, explosives, and illegal substances are banned, the list also prohibits strollers, Flipper Zero devices and Raspberry Pis, two pieces of consumer technology that are legal and widely used.

How to watch Samsung's First Look CES 2026 presentation Samsung is kicking off CES with a Sunday night press conference. Samsung is arguably the 800-pound gorilla of CES, with a full spectrum of products that range from phones and computers to refrigerators to AI assistants and rolling robots. But for, the company is shaking up the schedule a bit: Instead of its longtime midday Monday press conference position, the Korean giant will front-run the entire show with a Sunday night presentation. Samsung has already given a few hints as to what's on the agenda, but what we're really hoping to see is an update on the -- a star of previous CES presentations that ostensibly missed its previously promised . How to watch Samsung's The First Look presentation at CES 2026 The event will stream live from the Wynn Hotel in Las Vegas on Sunday, January 4 at 10PM ET.

Woman wags her finger at journalist who asks her if she's running a daycare out of stunning Seattle home Marla Maples' chilling Epstein warning as she feared his growing sway over Trump She wore the ultimate revenge dress after their brutal break up. But Nashville's hottest couple is'trying again'... and her friends are terrified MARK HALPERIN blows apart the Minnesota scandal... and reveals who will pay the ultimate price Kellyanne Conway brands lesbian comic Rosie O'Donnell a'slob' and says Trump-hating star needs to get a HUSBAND Daily Mail graphic reveals the bottled waters with the most cancer-causing'forever chemicals' 'Super' virus spreading uncontrollably... as New York sees the most cases ever and experts warn'we don't know when it will stop' Brave little girl jumped out apartment window and begged strangers to save her from abuse... only to be tortured to death after disbelieving cops sent her home Megyn Kelly names'meanest' celebrities... and hints NBC's twinkly-eyed TV grandpa is not as nice as he seems Hollywood's nastiest star: How Chevy Chase's outrageous behavior turned him into a pariah on and off set Children in headscarves seen being brought into notorious Minneapolis daycare hit by fraud allegations as local claims misspelt sign was just a'printing error' I tried the $12 'miracle' hangover cure... but I made a critical mistake that left me full of regret Snitch reveals all the gossip from inside the New England Patriots after Stefon Diggs allegedly'strangled' his female chef Heartbreak after body found in search for teenager as brother's missing weapon link emerges and devastated mom is left repeating four tragic words My husband set me a kinky New Year's resolution... DEAR JANE, I'm disgusted. But I'm afraid I can't say no'Work maintained my sense of self': How one woman's cancer journey inspired her company to give back As 2025 comes to a close, several mysteries that left the world in stunned disbelief still have yet to be fully explained. The past 12 months have read like a science-fiction novel, with thousands of UFOs swarming over the US East Coast, an interstellar visitor invading our solar system, and the potential discovery of giant columns under the Egyptian pyramids. Moreover, scientists and government officials have been unable to disprove all of the wild theories surrounding many of these jaw-dropping events, including one respected scientist's claim that the giant space rock 3I/ATLAS may be an alien craft.

Ukraine peace negotiations falter as Russia claims Kyiv launched drone attacks on a presidential residence, with President Donald Trump investigating the disputed allegations.

The Korean electronics giant will showcase new TVs and plenty of AI-powered products when it kicks off press day in Las Vegas. For years, LG has kicked off CES press day with the first event of the morning -- and 2026 will be no different. The Korea-based corporation is theming its presentation as Innovation in Tune with You, and -- if it follows the template of past presentations -- it will highlight both the consumer electronics and large appliance sides of its mammoth global businesses. Like nearly all tech-centric events these days, expect AI to be the binding theme of the LG presentation at CES 2026 . Just be aware that, like Apple, LG has its own customized abbreviation for AI: Affectionate Intelligence.

CES 2026: What to expect when tech's biggest conference starts on January 4 The new year is upon us, and that means CES 2026 is imminent. The biggest tech trade show of the calendar comes with a bevy of new and notable announcements that set the tone for trends and expectations for the subsequent 12 months. The CES 2026 show floor is officially open from January 6 through 9, but the fun kicks off with events on Sunday January 4, followed by a host of press conferences on Monday. As always, product demos, announcements and networking will be happening at the Las Vegas Convention Center and other hotels all over the city. As usual, Engadget will be covering the event in-person and remotely, bringing you news and hands-ons straight from the show floor.

Could 2026 be the year we start using quantum computers for chemistry? Whether quantum computers can actually solve practical problems is one of the biggest unanswered questions of this growing industry - and one that might be answered by researchers in industrial and medical chemistry in 2026. Calculating the structure, reactivity and other chemical properties of a molecule is an intrinsically quantum problem because it involves its electrons, which are quantum particles. But the more complex a molecule is, the harder these calculations become, in some cases posing a real challenge even for traditional supercomputers. On the other hand, because quantum computers are also intrinsically quantum, they should have an advantage when it comes to tackling these chemical calculations.