Domain-Specific Data Synthesis for LLMs via Minimal Sufficient Representation Learning

Tong Ye, Hang Yu, Tengfei Ma, Xuhong Zhang, Jianguo Li, Peng Di, Peiyu Liu, Jianwei Yin

#856 of 2821 · Artificial Intelligence
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Tournament Score
1451±49
10501800
78%
Win Rate
14
Wins
4
Losses
18
Matches
Rating
6.5/ 10
Significance
Rigor
Novelty
Clarity

Abstract

Large Language Models have demonstrated remarkable progress in general-purpose capabilities and can achieve strong performance in specific domains through fine-tuning on domain-specific data. However, acquiring high-quality data for target domains remains a significant challenge. Existing data synthesis approaches follow a deductive paradigm, heavily relying on explicit domain descriptions expressed in natural language and careful prompt engineering, limiting their applicability in real-world scenarios where domains are difficult to describe or formally articulate. In this work, we tackle the underexplored problem of domain-specific data synthesis through an inductive paradigm, where the target domain is defined only through a set of reference examples, particularly when domain characteristics are difficult to articulate in natural language. We propose a novel framework, DOMINO, that learns a minimal sufficient domain representation from reference samples and leverages it to guide the generation of domain-aligned synthetic data. DOMINO integrates prompt tuning with a contrastive disentanglement objective to separate domain-level patterns from sample-specific noise, mitigating overfitting while preserving core domain characteristics. Theoretically, we prove that DOMINO expands the support of the synthetic data distribution, ensuring greater diversity. Empirically, on challenging coding benchmarks where domain definitions are implicit, fine-tuning on data synthesized by DOMINO improves Pass@1 accuracy by up to 4.63\% over strong, instruction-tuned backbones, demonstrating its effectiveness and robustness. This work establishes a new paradigm for domain-specific data synthesis, enabling practical and scalable domain adaptation without manual prompt design or natural language domain specifications.

AI Impact Assessments

(1 models)

Scientific Impact Assessment: DOMINO — Domain-Specific Data Synthesis via Minimal Sufficient Representation Learning

1. Core Contribution

DOMINO addresses the problem of synthesizing domain-specific training data for LLMs when the target domain cannot be easily articulated in natural language but can be characterized through reference examples. This reframes data synthesis as an inductive rather than deductive problem. The framework learns a continuous "domain embedding" via soft prompt tuning combined with a contrastive disentanglement objective that separates shared domain-level patterns from sample-specific noise. The key innovation is the dual-representation architecture: domain-level soft tokens D* capture generalizable domain characteristics, while sample-level soft tokens S(i) absorb instance-specific details. The contrastive loss (L2) explicitly enforces this separation, preventing the domain representation from memorizing individual examples. This is a meaningful conceptual contribution — the idea that one can "induce" domain knowledge from examples by learning a minimal sufficient statistic in the prompt embedding space is elegant and practically motivated.

2. Methodological Rigor

Theoretical Analysis: The paper provides four propositions with proofs. Propositions 1–3 establish that the combined objective encourages sufficiency (capturing domain information) and minimality (discarding sample-specific noise). Proposition 4 proves that the minimal sufficient representation expands the ε-support of the synthetic distribution compared to vanilla prompt tuning, guaranteeing greater diversity. The proofs are straightforward but sound — Proposition 4's result is conditional on an entropy gap condition (Eq. 5), which is a reasonable but unverified assumption in practice. The theoretical contribution is more of a formal justification than a deep theoretical advance.

Experimental Design: The evaluation uses LiveCodeBench (Live Code Generation and Live Code Execution) with temporal cutoffs, which is a well-motivated choice — it naturally creates domains that are hard to describe textually but easy to exemplify. The use of three LLM backbones (OpenCoder-8B, Qwen2.5-Coder-7B, Qwen2.5-Coder-14B) provides reasonable breadth. The baselines (MAGPIE-Human, MAGPIE-Few Shot, Reference SFT, DOMINO-Direct Domain) are appropriate, though the comparison could be strengthened with more recent data synthesis methods.

Weaknesses in rigor: (1) The improvements, while consistent, are moderate — the headline "up to 4.63%" improvement is over the instruction-tuned backbone, not over the best baseline. The gap between DOMINO and DOMINO-Direct Domain is sometimes small. (2) No error bars or statistical significance tests are reported. (3) The filtering step (retaining only "Excellent" quality samples) introduces a confound — it's unclear how much of the performance gain comes from DOMINO's representation versus the quality filtering pipeline. (4) The evaluation on instruction following (Table 3) uses only one backbone and a single benchmark, limiting generalizability claims.

3. Potential Impact

Practical applications are significant. Many real-world domains (proprietary business logic, emerging scientific fields, niche programming paradigms) are easier to demonstrate by example than to formally describe. DOMINO provides a principled pipeline for such scenarios. The framework is lightweight — it only tunes soft prompt tokens while keeping the LLM frozen, making it computationally efficient and preserving the LLM's general capabilities.

Broader influence: The inductive paradigm for data synthesis could influence how the community thinks about domain adaptation. The minimal sufficiency framework borrowed from information theory provides a principled lens that could be extended to other representation learning problems. However, the current scope is narrow — primarily coding tasks with one additional instruction-following experiment. Demonstrating effectiveness on more diverse domains (medical, legal, scientific) would substantially strengthen impact claims.

4. Timeliness & Relevance

The paper addresses a genuine and timely bottleneck. As LLMs are deployed in increasingly specialized domains, the need for domain-specific data synthesis grows. Current approaches that depend on explicit prompt engineering scale poorly. The LiveCodeBench evaluation setting — using temporal splits to create naturally evolving domains — is well-aligned with real-world deployment scenarios. The acceptance at KDD 2026 reflects its relevance to the data mining and applied ML community.

5. Strengths & Limitations

Key Strengths:

  • Well-motivated problem formulation: The inductive vs. deductive framing is crisp and the problem is practically relevant.
  • Principled design: The information-theoretic framework (minimal sufficiency) provides clear motivation for each design choice.
  • Comprehensive ablations: The paper examines temperature, token counts, reference data percentage, and λ, providing good understanding of the method's behavior.
  • Interpretability analysis: The t-SNE visualizations and qualitative case studies (Table 2, Figure 7) effectively demonstrate that DOMINO captures abstract domain patterns rather than memorizing samples.
  • Efficiency: Only soft tokens are trained; the LLM remains frozen.
  • Notable Limitations:

  • Limited domain diversity: The primary evaluation is on coding tasks; the instruction-following extension is a single experiment. Claims of a "new paradigm" are ambitious given the narrow evaluation.
  • Modest improvements: Absolute gains are relatively small (1-4% Pass@1), and the practical significance of these gains is unclear without confidence intervals.
  • Missing baselines: No comparison with retrieval-augmented generation or other prompt-based methods that could leverage reference examples (e.g., few-shot in-context learning for synthesis).
  • Scalability questions: The contrastive loss (L2) requires computing likelihoods across all negative pairs, which may not scale well to very large reference sets.
  • Assumption sensitivity: The framework assumes reference samples are representative, and robustness to noisy or mixed-domain references is acknowledged but untested.
  • Reproducibility: While code is referenced on GitHub, key details about training compute, convergence behavior, and hyperparameter sensitivity across domains are limited.
  • Overall Assessment

    DOMINO presents a well-formulated and principled approach to an important practical problem. The combination of prompt tuning with contrastive disentanglement for minimal sufficient representation learning is novel and theoretically grounded. However, the empirical evaluation, while consistent, demonstrates modest improvements on a narrow set of domains, and the "new paradigm" framing somewhat oversells the current evidence. The work is a solid contribution to domain-adaptive data synthesis but would benefit from broader domain evaluation, stronger baselines, and statistical rigor.

    Rating:6.5/ 10
    Significance 6.5Rigor 6Novelty 7Clarity 7.5

    Generated May 29, 2026

    Comparison History (18)

    vs. Towards Human-Like Interactive Speech Recognition With Agentic Correction and Semantic Evaluation
    gemini-3.15/29/2026

    Paper 1 addresses a critical bottleneck in LLM development: domain-specific data scarcity. Its shift from a deductive, prompt-heavy paradigm to an inductive, representation-learning approach is highly innovative. By providing both theoretical proofs for data diversity and strong empirical gains, it establishes a foundational method applicable across countless domains. While Paper 2 presents a practical and novel agentic approach to ASR, Paper 1's contribution to data synthesis will likely have a broader, cross-disciplinary impact on the fundamental training pipelines of large language models.

    vs. TRACER: Turn-level Regret Matching with Inner Reinforcement Credit for Cooperative Multi-LLM Reasoning
    gpt-5.25/29/2026

    Paper 2 (DOMINO) likely has higher impact due to broader applicability and clearer real-world utility: scalable domain adaptation and data synthesis from only reference examples, addressing a common bottleneck across many LLM deployments. Its inductive paradigm generalizes beyond any single task and can benefit diverse fields requiring specialized data. It also includes theoretical support (support expansion) and empirical gains on coding benchmarks. Paper 1 is novel and rigorous for multi-LLM cooperative RL, but its impact is narrower (multi-agent reasoning setups) and depends on complex RL training and evaluation within a specific reasoning framework.

    vs. Satisfiability Solving with LLMs: A Matched-Pair Evaluation of Reasoning Capability
    claude-opus-4.65/29/2026

    Paper 1 (DOMINO) addresses a broadly impactful problem—domain-specific data synthesis for LLMs—with a novel inductive framework combining prompt tuning, contrastive disentanglement, and theoretical guarantees. It has wide practical applicability across many domains and establishes a new paradigm for scalable domain adaptation. Paper 2 contributes a useful evaluation methodology (ADR) for probing LLM reasoning on SAT, but its scope is narrower—primarily benchmarking and evaluation rather than enabling new capabilities. DOMINO's combination of methodological novelty, theoretical grounding, empirical gains, and broad practical utility gives it higher potential impact.

    vs. Beyond Consensus: Trace-Level Synthesis in Mixture of Agents
    claude-opus-4.65/29/2026

    Paper 2 introduces a fundamental insight about LLM aggregation—the 'aggregation paradox'—that challenges the widespread practice of majority voting. Its finding that trace-level synthesis outperforms consensus-based methods across diverse reasoning benchmarks (PhD-level science, competition math, competitive programming) has broader applicability across essentially all LLM deployment scenarios. The provable non-degradation guarantees and the surprising result that a single model with perturbations can outperform heterogeneous model pools represents a paradigm shift in multi-agent reasoning. Paper 1, while solid, addresses a more niche problem (domain-specific data synthesis) with more incremental improvements.

    vs. Surfacing Isolated Learners with Outcome-Independent Mediation of Feedback between Teachers and Students Using AI
    gemini-3.15/29/2026

    Paper 2 addresses a fundamental bottleneck in LLM development—domain-specific data scarcity—proposing a highly scalable, inductive synthesis framework (DOMINO). Its combination of theoretical proofs and empirical gains on benchmarks suggests broad applicability across multiple AI domains. In contrast, Paper 1 offers a valuable but preliminary application of AI in education, limited by a single-course evaluation and narrower scope, making Paper 2's potential scientific impact significantly higher.

    vs. Moment-KV: Momentum-Based Decode-Time KV Cache Compression for Long Generation
    claude-opus-4.65/29/2026

    DOMINO introduces a fundamentally new paradigm (inductive vs. deductive) for domain-specific data synthesis, addressing a broadly applicable problem with theoretical guarantees and strong empirical results. Its framework for learning domain representations from examples without explicit descriptions has wide applicability across many domains and tasks. Moment-KV, while solving a real engineering bottleneck in KV cache compression, is more incremental—applying momentum-based temporal aggregation to an existing line of work. Paper 2's broader applicability, theoretical contributions, and paradigm-shifting framing give it higher potential impact.

    vs. Geometry of Human Perceptual Domains Emerges Transiently in LLM Representations
    claude-opus-4.65/29/2026

    Paper 1 offers more novel scientific insights by revealing that human perceptual geometry transiently emerges in LLM representations despite no perceptual training, bridging cognitive science and AI interpretability. This finding has broad interdisciplinary implications for understanding both human cognition and LLM internals. Paper 2 presents a solid engineering contribution (DOMINO framework for data synthesis), but is more incremental within the well-explored space of data augmentation and domain adaptation. Paper 1's discovery-driven nature and cross-disciplinary relevance give it higher potential for lasting scientific impact.

    vs. CrystalXRD-Bench: Benchmarking Vision-Language Models for XRD Peak Indexing Across Diverse Crystalline Materials
    gemini-3.15/29/2026

    Paper 1 addresses a fundamental bottleneck in LLM development—domain-specific data synthesis—proposing an innovative inductive paradigm that does not rely on manual prompt engineering. This methodological advance has broad applicability across numerous fields aiming to adapt LLMs. In contrast, Paper 2 introduces a valuable but highly specialized benchmark for a specific task in materials science, which limits its immediate breadth of impact compared to the foundational LLM methodology proposed in Paper 1.

    vs. NICE: A Theory-Grounded Diagnostic Benchmark for Social Intelligence of LLMs
    gemini-3.15/29/2026

    Paper 2 addresses a critical bottleneck in LLM development (acquiring high-quality domain-specific data) with a scalable, novel inductive framework that eliminates the need for manual prompt engineering. Its approach has broad theoretical and practical applicability across many domains. In contrast, Paper 1, while tackling the important issue of social intelligence, presents a relatively small benchmark (137 items) localized to Chinese contexts, which limits its broader and immediate scientific impact.

    vs. Governing Technical Debt in Agentic AI Systems
    claude-opus-4.65/29/2026

    Paper 2 presents a novel technical framework (DOMINO) with theoretical guarantees and empirical validation, addressing a concrete and important problem in LLM domain adaptation. It introduces a new inductive paradigm for data synthesis with rigorous methodology including contrastive disentanglement objectives and provable diversity guarantees. Paper 1, while timely, is primarily a conceptual/governance framework introducing terminology (Agentic Technical Debt, Stochastic Tax) without empirical validation or technical depth, limiting its scientific impact to management-oriented discussions rather than advancing the field methodologically.

    vs. Architecture-Sensitive Supervised Fine-Tuning for Screen-Conditioned Action Prediction: A PiSAR Benchmark
    claude-opus-4.65/29/2026

    Paper 2 (DOMINO) introduces a novel framework addressing a fundamental challenge in LLM domain adaptation—synthesizing domain-specific data without explicit domain descriptions. It offers theoretical guarantees, a generalizable inductive paradigm, and demonstrates empirical improvements across coding benchmarks. Its contributions (contrastive disentanglement, minimal sufficient representation learning) are broadly applicable across many domains. Paper 1 is primarily a benchmarking study on a specific dataset (PiSAR) with narrower scope, limited novelty beyond empirical observations about fine-tuning recipe-model mismatches, and less generalizable findings.

    vs. When Models Disagree: Rethinking LLM Evaluation for Public Comment Analysis
    gpt-5.25/29/2026

    Paper 1 has higher potential impact due to a more technically novel, generalizable method (inductive domain definition from examples via minimal sufficient representations, contrastive disentanglement, and prompt tuning) that directly addresses a widespread bottleneck: domain data scarcity for LLM adaptation. It provides theoretical guarantees (support expansion) and measurable performance gains on challenging coding benchmarks, making it broadly applicable across many domains and timely for LLM deployment. Paper 2 is important for responsible evaluation in a specific policy-analytics setting, but its methodological contribution and generality are narrower.

    vs. Continual Model Routing in Evolving Model Hubs
    gpt-5.25/29/2026

    Paper 2 likely has higher impact: it defines a new practical problem setting (Continual Model Routing) aligned with the fast-growing ecosystem of model hubs, and contributes a large-scale benchmark (CMRBench with 2,000+ models) that can standardize evaluation and drive follow-on work. Its proposed method (CARvE) targets scalable, continual updates—highly relevant for real deployments and broadly applicable across tasks/domains. Paper 1 is novel and useful for domain data synthesis, but appears narrower (primarily domain adaptation via synthetic data) and its benchmark impact may be more limited than a widely reusable benchmark + framework for routing in model hubs.

    vs. MIRA: Mid-training Rubric Anchoring for Source-Aware Data Selection
    gemini-3.15/29/2026

    Paper 2 tackles the critical bottleneck of domain-specific data scarcity by introducing a novel inductive synthesis paradigm that operates without explicit natural language prompts. Its approach of learning minimal sufficient representations has broader applicability across various specialized domains than Paper 1's mid-training filtering method. Furthermore, Paper 2 is supported by theoretical proofs and demonstrates strong empirical improvements, suggesting a deeper methodological rigor and higher potential for wide-ranging impact in LLM domain adaptation.

    vs. Do LLMs Build World Models From Text? A Multilingual Diagnostic of Spatial Reasoning
    gpt-5.25/29/2026

    Paper 2 likely has higher scientific impact due to its broadly useful, multilingual diagnostic benchmark (MentalMap) and strong empirical finding (a universal L3 “reasoning cliff”) that reframes debates about whether LLMs build spatial world models from text. The benchmark spans languages, tasks, and diagnostic axes, enabling wide reuse across NLP, cognitive science, and multimodal reasoning research, and includes human baselines that strengthen claims. Paper 1 is novel and applicable for domain adaptation, but its impact is narrower (data synthesis for fine-tuning) and more incremental relative to existing synthesis/prompt-tuning lines.

    vs. ConMoE: Expert-Pool Consolidation via Prototype Reassignment for MoE Compression
    claude-opus-4.65/29/2026

    Paper 1 (DOMINO) addresses a more fundamental and broadly impactful problem—domain-specific data synthesis for LLMs through an inductive paradigm—which has wide applicability across many domains and tasks. It introduces a novel theoretical framework with provable guarantees on distribution coverage, combines prompt tuning with contrastive disentanglement, and establishes a new paradigm shift from deductive to inductive domain specification. Paper 2 (ConMoE) addresses MoE compression, which is important but more incremental and narrower in scope, reformulating existing pruning/merging ideas as prototype reassignment without introducing training or theoretical novelty of comparable depth.

    vs. Entropy-KL Divergence-based Token Masking: A Novel Approach for Selective Fine-tuning of Large Language Models
    gpt-5.25/29/2026

    Paper 1 is more novel and broadly impactful: it introduces an inductive paradigm for domain-specific data synthesis from reference examples (no explicit domain description), with a concrete framework (DOMINO) combining minimal sufficient representation learning, contrastive disentanglement, and prompt tuning, plus theoretical support-expansion guarantees and demonstrated gains on implicit-domain coding tasks. This addresses a central bottleneck (domain data acquisition) with clear real-world applicability across many domains. Paper 2 is useful but more incremental (a masking heuristic for SFT stability in low-data regimes) and narrower in scope (mainly SFT-to-RL pipelines on math benchmarks).

    vs. Diagnosing Live Within-Policy Instruction Conflicts in LLM Agents with Witnessed Resolution Profiles
    gpt-5.25/29/2026

    Paper 2 (DOMINO) likely has higher impact due to broader applicability and direct performance gains: it addresses a common bottleneck (domain data acquisition) with an inductive, example-driven synthesis paradigm that can generalize across many hard-to-describe domains. It combines a clear methodological contribution (minimal sufficient representation + contrastive disentanglement + prompt tuning), includes theoretical support (distributional support expansion), and shows measurable benchmark improvements. Paper 1 (WIRE) is novel and important for LLM agent safety/policy engineering, but its impact is narrower (prompt-policy conflict diagnostics) and more evaluative than enabling across tasks.