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Ibne Farabi Shihab

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Preprint Aug 2026

Private Anytime Selective-Risk Certification for Federated Retrieval-Augmented Generation: Guarantees and Empirical Limits

Selective-risk certificates promise that accepted outputs meet a declared error target. We develop Fed-SRC, a score-agnostic certificate for federated, differentially private, adaptively monitored retrieval-augmented generation. Clients release only Gaussian-perturbed score and loss histograms. Record-indexed and noise...

Sanjeda Akter, Ibne Farabi Shihab, Anuj Sharma · 0 citations
#machine learning Preprint Sep 2026

Before Answering: Evidence Sufficiency under Size-Matched Memory Construction

Agents that answer questions from compressed or retrieved memory must recognize when the evidence a query needs is no longer in memory. Benchmarks for this task usually create insufficient-evidence examples by deleting supporting passages. We show that this construction leaks the label through memory size: on MuSiQue,...

Joyanta J. Mondal, Md. Shifatul Ahsan Apurba, Mridul Banik et al. · 0 citations
#machine learning Preprint Aug 2026

Certified Predictive Value-of-Advice Gating for Cost-Aware Language-Model Guidance in Reinforcement Learning

The demonstrated benefit is robust sparse advice volume on a useful task, not a proven per-state placement advantage, because the response-contingent metareasoning problem is formulated as a response-contingent metareasoning problem.

Ibne Farabi Shihab, Md Najmus Swaqeeb, Abu Sa-Adat Mohamed Moon-Im Al Ahsan · 0 citations
#machine learning Preprint Aug 2026

Spectral-Guided Diffusion: Accelerating Inference via Static Spectral Layer Scheduling

The perturbation analysis motivates pre-norm attention and MLP components under explicit local assumptions; results on AdaLN, U-shaped, convolutional, and cross-attention blocks are empirical transfer, not certified guarantees.

Ibne Farabi Shihab, Abu Sa-Adat Mohamed Moon-Im Al Ahsan, Anuj Sharma · 0 citations
#machine learning Preprint Aug 2026

Task-Aware Spectral Pruning: A Mixture-of-Masks Framework for Efficient LLM Inference

Task-Aware Spectral Pruning (TASP), a post-training framework that calibrates module-level spectral descriptors against measured task-specific ablation effects, closes grouped-query-attention and SwiGLU dependencies during sparse-mask construction, and routes each user turn to one compiled mask that remains fixed throu...

Ibne Farabi Shihab, Fariya Afrin, Sanjeda Akter et al. · 0 citations
#machine learning Preprint Aug 2026

BLADE: Distilled LLM Regularization for Calibrated Knowledge Graph Completion

BLADE is presented, a variational model that separates latent truth from graph recording and distills offline language-model judgments into a frozen teacher regularizer and claims calibration only for the declared candidate distributions, not for all unobserved triples.

Ibne Farabi Shihab, Rabeya Bosri Tamanna, Abdo El Karaky et al. · 0 citations
#machine learning Preprint Aug 2026

When Accuracy Gaps Fail to Certify: Auditing Cross-Domain Recalibration of LLM Judges

A scalar recalibration map fitted for an LLM judge on one task can fail when the task distribution changes, but the source-target accuracy gap is often treated as a proxy for that failure. We test what this gap can predict and what it can certify across thirteen judges, two generators, eight domains, and 1,176 predecla...

Fariya Afrin, Ibne Farabi Shihab · 0 citations
#machine learning Preprint Aug 2026

Spectral Tail Interventions in Decoder-Only Language Models: Reasoning-Sensitive Weight Structure from Controlled Surgery

A finite-width conditional bound linking the inverse participation ratio of squared singular values to central pre-softmax logit kurtosis is derived and a pointwise query--key product-tail target is defined and compared with independent factor surgery with a product-targeted factorization that preserves native attentio...

Ibne Farabi Shihab, Sanjida Akhter, Md Najmus Swaqeeb et al. · 0 citations
Preprint Aug 2026

Calibration-Preserving Pruning: Compression as a Reliability Contract

Calibration-Preserving Pruning augments a base pruning score with nonconformity-gradient saliency and uses disjoint pruning, validation-selection, conformal-calibration, and test splits to obtain smaller valid prediction sets.

Ibne Farabi Shihab, Adria Binte Habib, Anuj Sharma · 0 citations
Preprint Aug 2026

Finite Constant Frontiers and Auditable Regret Certificates for Average-Reward Reinforcement Learning

An explicit finite lower certificate for communicating MDPs is derived and an auditable composition rule for a span-constrained optimistic learner is given, and valid expectation conversion and constant comparability are formalized.

Ibne Farabi Shihab, Abu Sa-Adat Mohamed Moon-Im Al Ahsan, Md Najmus Swaqeeb · 0 citations

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