arxiv arXiv cs.AI · 7h ago

Semantic Browsing: Controllable Diversity for Image Generation

Modern text-to-image models often suffer from diversity collapse despite high fidelity. The authors introduce Semantic Browsing to enable controlled diversity through structured image galleries. This method allows users to navigate meaningful axes of variation rather than incidental noise. The approach exploits the decoupling of semantic decision-making and pixel generation in recent models. Diversity is induced directly at the text level using rich textual representations. A Vision Language Model operates on full scene context within an agentic workflow. This workflow explicitly enforces structured variation attuned to the original prompt. The result is a navigable design space with interpretable semantic decisions.

arxiv arXiv cs.AI · 7h ago

CoorDex: Coordinating Body and Hand Priors for Continuous Dexterous Humanoid Loco-Manipulation

The authors introduce CoorDex, a learning pipeline that enables high-degree-of-freedom dexterous loco-manipulation on moving humanoids. This approach converts high-dimensional body and hand control into coordinated latent residual control, overcoming the limitations of traditional stop-and-go methods. The system trains privileged motion tracking teachers from simulated demonstrations and distills them into proprioception-conditioned latent priors. These frozen priors serve as the action space for downstream residual reinforcement learning via a policy that composes task context with separate body-hand residual heads. CoorDex allows a Unitree G1 humanoid equipped with a 20-DoF WUJI hand to perform complex tasks while in motion, such as non-stop bottle grasping and fridge door opening. Ablation studies demonstrate that joint-space PPO and monolithic latent prediction fail under similar reward budgets, whereas the proposed latent-prior interface ensures trainability for contact-rich manipulation.

arxiv arXiv cs.LG · 7h ago

Encoder-Decoder Manifold Alignment for Idempotent Generation

Recent learning paradigms aim to enforce idempotency in generative models by ensuring repeated application leaves samples unchanged on the target data manifold. However, many existing approaches fail to achieve exact fixed points, resulting in instability and drift during repeated applications. The authors identify a geometric mismatch between encoder and decoder manifolds as the primary cause of this failure. To resolve this, they propose a training framework that explicitly aligns the geometry of both components to learn consistent representations of the same underlying data manifold. This alignment encourages stable projections and significantly reduces idempotency error compared to prior methods. Empirical results demonstrate that the approach consistently regenerates identical outputs under repeated application for both image generation and editing tasks. Furthermore, enforcing this type of idempotency improves identity preservation and information stability in generative models.

arxiv arXiv cs.LG · 8h ago

Manifold Restore Mixing Enhances Protein Representation Learning

Data augmentation improves protein representation learning but often disrupts structural integrity or reduces diversity. The authors identify these structure defects and performance degradation issues in existing methods. They propose Manifold Restore Mixing (MRM) to restore lost structural information while introducing diverse variations. MRM mixes hidden representations of original and augmented data, inspired by manifold mixup techniques. A sample difficulty scheduler adjusts the beta distribution to provide progressively challenging samples during training. Experiments on various backbones and downstream tasks demonstrate the method's effectiveness and generalization. The implementation is available at https://github.com/KingGugu/MRM.

arxiv arXiv cs.LG · 8h ago

Entropy-Guided Boundary Supervision for Breast Ultrasound Segmentation

This study introduces an entropy-guided boundary supervision method to address boundary leakage and false-positive activations in breast ultrasound segmentation. The proposed loss function scales contour penalties by per-pixel predictive entropy and ground-truth maps, focusing gradient emphasis on uncertain lesion margins. Evaluated on the BUSI dataset, the method preserved lesion segmentation quality with a mean Dice score of 0.7624, statistically indistinguishable from the baseline. However, it significantly improved specificity by reducing false-positive activations on no-lesion images from 19 of 20 to 5 of 20. A post-hoc spatial temperature scaling step further reduced the expected calibration error from 0.0201 to 0.0095 without altering segmentation masks. These results demonstrate that entropy-guided supervision and spatial calibration function as complementary refinements within a U-Net framework.

arxiv arXiv cs.LG · 8h ago

Diffusion Integrated Gradients: Controllable Path Generation for Flexible Feature Attribution

The authors propose Diffusion Integrated Gradients (DiffIG), a novel method that reformulates path generation as a conditional generative modeling problem to address limitations in existing attribution techniques. While integrated gradients are widely used, their reliance on fixed or hand-crafted paths often results in noisy or distorted attributions. To solve this, DiffIG trains a diffusion model to learn a distribution over paths derived from a Stick-Breaking Process. The method then employs guided sampling to allow for the embedding of user guidance during the inference-time sampling procedure. This approach enables flexible and controllable feature attribution by treating path selection as a generative task rather than a static choice. Experimental results demonstrate that DiffIG quantitatively matches or outperforms existing path-based methods in terms of attribution quality. Furthermore, the generated explanations are shown to be perceptually aligned with human expectations. The work introduces a new generative perspective for Explainable Artificial Intelligence that supports dynamic control over explanation paths.

arxiv arXiv cs.LG · 8h ago

First Finite-Time Analysis of Classical Adam for Nonsmooth Nonconvex Optimization

This study presents the first finite-time convergence analysis for the classical Adam optimizer, specifically addressing its behavior in nonsmooth nonconvex optimization settings. Previous research largely ignored Adam's bias-correction term or required extra algorithmic modifications like clipping, leaving the original method's guarantees unclear. The authors utilize the Online-to-Nonconvex Conversion framework to prove that a randomly scaled learning rate ensures a convergence rate of $1/T^{ rac{2}{13}}$. This theoretical result is significant because it applies to the modern heavy-tailed noise regime, which more closely reflects practical training conditions. Furthermore, the analysis establishes convergence under the parameter choice where $β_1=β_2$, aligning with recent empirical observations. These findings provide a rigorous explanation for Adam's effectiveness in real-world scenarios that were previously inadequately captured by smooth optimization theories.

arxiv arXiv cs.LG · 8h ago

Boundary-Aware Curriculum RL Expands LLM Reasoning Capacity Beyond Base Model Limits

The authors argue that mainstream Reinforcement Learning with Verifiable Rewards (RLVR) often fails to expand the reasoning capacity of large language models, merely reallocating probabilities among existing trajectories. To address this limitation, they introduce a boundary-aware Curriculum RL approach designed to move beyond the base model's empirical reasoning capacity boundary. The method first utilizes pass@k sampling to identify the current reasoning limits and then applies targeted teacher guidance to examples near or beyond that boundary. Reinforcement learning is subsequently used to consolidate these newly introduced reasoning patterns across Qwen, Llama, and DeepSeek base models. Experimental results demonstrate significant improvements in both pass@1 scores and pass@256 scores, which serve as a proxy for the reasoning capacity boundary. Specifically, average pass@256 improved by 9.8 percentage points over the base models and by 10.3 percentage points over Vanilla RLVR. These findings suggest that this curriculum-based strategy offers a scalable route for continuously improving LLM reasoning capabilities.

arxiv arXiv cs.LG · 8h ago

Attention Sinks and Collapse Are Universal Consequences of Content-Based Routing

The study demonstrates that attention sinks, representation collapse, and norm stratification are not unique to transformer architectures but are inherent consequences of content-based routing under a fixed similarity metric. It establishes an identity showing softmax attention functions as Boltzmann-weighted aggregation over Euclidean distances with constant key norms, rendering it blind to key magnitude due to the omission of a specific norm term. This framework predicts that any router utilizing a metric ill-matched to its representations will compensate by concentrating routing and collapsing the routed representations. The authors validate this hypothesis across diverse models including nine pretrained transformers, graph attention networks, selective state-space models, recurrent mixers, and learned residual layers. Experimental results confirm that all tested architectures exhibit this identical signature of collapse regardless of their specific domain or structure. Furthermore, within-model ablations isolate the routing mechanism as the primary cause rather than incidental training dynamics. The onset of this phenomenon is shown to be contingent on the strength of the positional brake accompanying the content score, which can shift the effect across its range. However, the underlying mechanism remains invariant and does not require norm stratification, as routers with norm-normalized keys exhibit the same concentration behavior.

arxiv arXiv cs.LG · 8h ago

No Reference-Free Generalization in Quantum Machine Learning

This study addresses the identifiability problem in quantum machine learning where training data lacks a preferred basis or reference frame. The authors formulate supervised learning without an external quantum reference frame, requiring classifiers to preserve unitary symmetries unbroken by the training data. They prove that if training states do not span the full Hilbert space, all pure states orthogonal to this span receive identical predictions. This limitation arises from missing reference information rather than state discrimination or computational constraints. The research establishes a robust version under weak symmetry breaking and shows that learning generic concepts requires exponentially many oriented training directions. Numerical illustrations visualize the resulting prediction collapse and its controlled relaxation. The results identify feature maps, measurement bases, and diverse training states as essential operational resources for generalization.

arxiv arXiv cs.LG · 9h ago

Null-Calibrated Conformal Selection via Target-Membership Scores

The article introduces Null-Calibrated Conformal Selection (NCCS), a method that utilizes target-membership probability scores to identify test candidates within a target region while controlling the false discovery rate. The authors argue that these membership scores provide a more natural ranking for selection tasks than conventional prediction-oriented nonconformity scores, particularly for complex targets. This distinction is critical for interval-valued, variance-driven, multimodal, or multi-condition targets where traditional scores may be misaligned with selection power. NCCS ranks test scores against confirmed non-target calibration examples to yield finite-sample valid null p-values under null exchangeability. These p-values can be combined with the Benjamini-Yekutieli procedure under arbitrary dependence or the Benjamini-Hochberg procedure under standard positive-dependence conditions. Experiments demonstrate that membership scores match conventional scores on mean-monotone targets but substantially improve performance on variance-driven targets. In rare-target regimes, NCCS trades power for finite-sample null validity, addressing issues where direct empirical-FDP thresholding can be anti-conservative.

arxiv arXiv cs.LG · 9h ago

Flow Annealing Posterior Sampling for Function-Space Regression and Inverse Problems

The authors introduce Flow Annealing Posterior Sampling (FAPS), a novel framework that unifies stochastic-process regression with PDE inverse problems in function space. Built upon pretrained function-space flow-matching priors, FAPS facilitates likelihood-guided posterior inference using sparse and noisy observations. The method supports variable query discretizations and avoids the need for explicit prior-density evaluation during sampling. It employs a Langevin correction mechanism that utilizes a low-rank covariance preconditioner to exploit dominant function-space correlations across different discretizations. Benchmarks on both Gaussian and non-Gaussian stochastic processes demonstrate that FAPS produces coherent posterior samples with accurate uncertainty quantification. The approach significantly outperforms existing functional regression baselines in these standard tasks. Furthermore, it achieves competitive or superior performance in noisy PDE inverse problems compared to diffusion-based samplers while reducing test-time sampling costs.

media r/LocalLLaMA · 9h ago

Backtrack Sampler and Verifier Drastically Improve Tiny Model Coding Performance

A new backtrack sampler combined with a verifier model significantly enhances the coding performance of tiny 0.5B parameter models, potentially making them competitive with larger 2-4B class models without weight changes. The approach theoretically addresses hallucination issues in large models by correcting errors during generation through re-sampling. However, this method incurs a 5-30% decode speed penalty due to the need for backward passes and requires training a verifier model of similar size to the original. This requirement doubles VRAM usage and increases compute demands by 1.5 to 3 times compared to standard inference. Despite these costs, the verifier generalizes across models of equal or lower weight classes if trained on diverse data distributions. Training the verifier is highly efficient, requiring only approximately 0.01% of the token size used for full pre-training.

arxiv arXiv cs.CL · 10h ago

Weave of Formal Thought: Uniting Rigorous Syntactic Validation with Learned Structural Representations

The authors introduce Weave of Formal Thought (WoFT), a paradigm combining rigorous syntactic validation with learned structural representations for code generation. The approach utilizes a formal engine and constrained decoder that is sound and complete regarding the full Tree-sitter specification. By augmenting generalized LR parsing with speculative lexing, the system maintains concurrent lexer-state hypotheses to admit valid program prefixes while rejecting invalid ones. Additionally, WoFT employs latent-variable fine-tuning to train models to interleave non-terminal grammar symbols directly into the generation process. This method uses the reweighted wake-sleep algorithm to optimize the importance-weighted evidence lower bound of the surface text. The model learns to selectively retain formal derivations as an adaptive structural scratchpad during inference. Experiments on Python show that fine-tuning StarCoder2-3B with this objective reduces per-token cross-entropy by 14.3% compared to a text-only baseline.

lab OpenAI News · 11h ago

OpenAI Research Shows AI Agents Transforming Work

A new research paper from OpenAI demonstrates how artificial intelligence agents are fundamentally changing the nature of work. The study highlights the capability of these agents to execute longer and more complex tasks than previously possible. This technological advancement is credited with expanding productivity across a wide variety of professional roles. The findings suggest a significant shift in how labor is organized and performed through automation. By handling intricate workflows, AI agents are enabling users to achieve greater efficiency. The paper serves as evidence of the growing impact of autonomous systems on modern employment.

arxiv arXiv cs.CL · 11h ago

Tatoxa: A Novel Text Detoxification System for Low-Resource Tatar

The paper introduces Tatoxa, a state-of-the-art system designed for automated text detoxification in the low-resource language of Tatar. This work addresses the lack of research attention given to abusive content mitigation in languages with limited digital resources. The authors present a new dataset specifically created for fine-tuning and evaluating detoxification models within these constrained settings. Comparative experiments demonstrate that Tatoxa outperforms both existing open-source and proprietary commercial large language models on key quality metrics. Furthermore, the study investigates cross-lingual transfer capabilities to assess the viability of using data from other languages. Results indicate that training on native Tatar data is significantly more effective than transferring knowledge from culturally close languages like Russian. Even when a large Russian corpus is available, cross-lingual approaches perform worse than models trained exclusively on native Tatar text.

arxiv arXiv cs.CL · 11h ago

Detect, Unlearn, Restore: Defending Text Summarization Models Against Data Poisoning

The study addresses the threat of training-time data poisoning during fine-tuning for abstractive text summarization models. Adversaries manipulate small task-specific datasets to induce persistent summarization failures while maintaining standard evaluation metrics. A unified post-hoc defense framework is proposed to detect and remediate poisoning across the machine learning supply chain. In white-box settings, detection relies on influence-function analysis identifying abnormally high training influence in poisoned pairs. Black-box defenses utilize behavioral auditing based on increased sensitivity to semantics-preserving perturbations. The authors introduce novel attacks targeting factual distortion and representational bias that evade conventional alarms. Experiments across nine architectures and six benchmarks show 85-92% detection precision for the proposed defenses. Gradient-ascent unlearning restores up to 96% of original behavior with less than 0.6% ROUGE degradation.

arxiv arXiv cs.CL · 12h ago

Natural Ungrokking: Asymmetric Control of Which Rules Survive Pretraining

A study identifies 'natural ungrokking,' a phenomenon where small language models lose learned grammatical rules midway through pretraining despite the evidence remaining in the data. Researchers observed that a model learning pronoun-gender agreement with Sue collapsed from 0.94 accuracy to near zero by step 3,500 without any corresponding spike in the loss curve. The survival of these rules is determined by support frequency within the training stream, while the data-to-parameter ratio only modulates the depth of the collapse. This emergence-then-collapse dynamic was replicated across multiple corpora, budgets, and seeds, and confirmed in public Pythia checkpoints where collapse depth correlated with model scale. The forgetting process acts as a displacement mechanism where a competing surface pattern out-competes the rule, causing the log-probability margin to cross zero within 100 steps of behavioral failure. Control over this fate is asymmetric; while injecting counter-evidence can destroy rules via a monotone dose-response, restoring support even at 450 times the sustaining level fails to recover them.

arxiv arXiv cs.CL · 12h ago

Keyword Lexicon Blindness Distorts Rhetorical Stance Measurement

A study analyzing 85 interviews with four public intellectuals reveals that keyword-based scoring can produce statistical artifacts regarding rhetorical stance. Initial analysis showed a robust negative-affect and emphatic-certainty co-occurrence pattern with high correlation coefficients ranging from r = 0.72 to 0.93. However, replacing this method with LLM-based zero-shot semantic classification on the full diarized corpus of 32,625 sentences significantly reduced these correlations. For instance, Dalio's correlation dropped from 0.851 to 0.206, while other speakers exhibited negative or null relationships between negativity and certainty. In contrast, the LLM analysis revealed a strong coupling between negative sentiment and hedging language, aligning with conventional expectations of pessimistic discourse. The discrepancy stems from three structural failures in keyword lexicons: syntactic blindness, polysemy blindness, and categorical absence. These flaws can invert semantic meaning, such as scoring 'never absolutely totally confident' as high certainty. The authors argue that keyword counts measure lexical co-occurrence tendencies rather than epistemic certainty, constituting a category error.

arxiv arXiv cs.CL · 13h ago

Structuring an Arabic-English Machine-Readable Dictionary Using Parsing Expression Grammars

This paper presents a method for structuring a machine-readable version of the Arabic-English Al-Mawrid dictionary, addressing the lack of standardization in printed formats. The approach converts unstructured streams of words and punctuation into explicit hierarchical structures that define entry components such as subentries, domain labels, and translation equivalences. Parsing serves as the central step within a cascaded design, implemented using the parsing expression grammars formalism. This technique allows for the automatic or semi-automatic organization of dictionary entries despite the absence of microstructure standardization in Arabic dictionaries. The study demonstrates that inducing microstructure enables plausible accuracy in structuring these complex lexical resources. By transforming raw text into defined formats, the work supports downstream natural language processing applications requiring machine-readable lexical data.