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MaskOpt or It Didn’t Happen: Teaching AI to See Chips Like Lithography Engineers

Opening — Why this matters now AI has officially entered semiconductor manufacturing—again. And once again, the promise is speed: faster mask optimization, fewer simulations, lower cost. Yet beneath the marketing gloss lies an inconvenient truth. Most AI models for optical proximity correction (OPC) and inverse lithography technique (ILT) have been trained on data that barely resembles real chips. Synthetic layouts. Isolated tiles. Zero awareness of standard-cell hierarchy. No real notion of context. ...

December 27, 2025 · 4 min · Zelina
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When One Token Rules Them All: Diffusion Models and the Quiet Collapse of Composition

Opening — Why this matters now Text-to-image diffusion models are often marketed as masters of compositional imagination: just add more words, and the model will obligingly combine them into a coherent visual scene. In practice, however, this promise quietly collapses the moment multiple concepts compete for attention. A landmark swallows an object. An artist style erases the product. One concept wins, the other simply vanishes. ...

December 27, 2025 · 4 min · Zelina
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When Physics Remembers What Data Forgets

Opening — Why this matters now AI has become very good at interpolation and notoriously bad at extrapolation. Nowhere is this weakness more visible than in dynamical systems, where small forecasting errors compound into total nonsense. From markets to climate to orbital mechanics, the business question is the same: how much data do you really need before a model can be trusted to look forward? ...

December 27, 2025 · 4 min · Zelina
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Dexterity Over Data: Why Sign Language Broke Generic 3D Pose Models

Opening — Why this matters now The AI industry loves scale. More data, bigger models, broader benchmarks. But sign language quietly exposes the blind spot in that philosophy: not all motion is generic. When communication depends on millimeter-level finger articulation and subtle hand–body contact, “good enough” pose estimation becomes linguistically wrong. This paper introduces DexAvatar, a system that does something unfashionable but necessary—it treats sign language as its own biomechanical and linguistic domain, not a noisy subset of everyday motion. ...

December 26, 2025 · 3 min · Zelina
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TexAvatars: When UV Maps Learn to Respect Geometry

Opening — Why this matters now Photorealistic digital humans have quietly become infrastructure. Telepresence, XR collaboration, virtual production, and real‑time avatars all demand faces that are not just pretty, but stable under abuse: extreme expressions, wild head poses, and cross‑identity reenactment. The industry’s dirty secret is that many state‑of‑the‑art avatars look convincing—until you ask them to smile too hard. ...

December 26, 2025 · 4 min · Zelina
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When Graphs Stop Guessing: Teaching Models to Rewrite Their Own Meaning

Opening — Why this matters now Graph learning has quietly run into a ceiling. Not because graph neural networks (GNNs) are weak, but because they are confidently opinionated. Once you choose a GNN, you lock in assumptions about where signal should live: in node features, in neighborhoods, in homophily, in motifs. That works—until it doesn’t. ...

December 26, 2025 · 4 min · Zelina
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When Guardrails Learn from the Shadows

Opening — Why this matters now LLM safety has become a strangely expensive habit. Every new model release arrives with grand promises of alignment, followed by a familiar reality: massive moderation datasets, human labeling bottlenecks, and classifiers that still miss the subtle stuff. As models scale, the cost curve of “just label more data” looks less like a solution and more like a slow-burning liability. ...

December 26, 2025 · 3 min · Zelina
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When Models Learn to Forget: Why Memorization Isn’t the Same as Intelligence

Opening — Why this matters now Large language models are getting better at everything—reasoning, coding, writing, even pretending to think. Yet beneath the polished surface lies an old, uncomfortable question: are these models learning, or are they remembering? The distinction used to be academic. It no longer is. As models scale, so does the risk that they silently memorize fragments of their training data—code snippets, proprietary text, personal information—then reproduce them when prompted. Recent research forces us to confront this problem directly, not with hand-waving assurances, but with careful isolation of where memorization lives inside a model. ...

December 26, 2025 · 3 min · Zelina
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When Policies Read Each Other: Teaching Agents to Cooperate by Reading the Code

Opening — Why this matters now Multi-agent systems are finally leaving the toy world. Autonomous traders negotiate with other bots. Supply-chain agents coordinate across firms. AI copilots increasingly share environments with other AI copilots. And yet, most multi-agent reinforcement learning (MARL) systems are still stuck with a primitive handicap: agents cannot meaningfully understand what other agents are doing. ...

December 26, 2025 · 4 min · Zelina
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When the Answer Matters More Than the Thinking

Opening — Why this matters now Chain-of-thought (CoT) has quietly become the default crutch of modern LLM training. When models fail, we add more reasoning steps; when benchmarks stagnate, we stretch the explanations even further. The assumption is implicit and rarely questioned: better thinking inevitably leads to better answers. The paper “Rethinking Supervised Fine-Tuning: Emphasizing Key Answer Tokens for Improved LLM Accuracy” challenges that assumption with a refreshingly blunt observation: in supervised fine-tuning, the answer itself is often the shortest—and most under-optimized—part of the output. ...

December 26, 2025 · 4 min · Zelina