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arxiv: 2605.14057 · v2 · pith:QLSM76VMnew · submitted 2026-05-13 · 💻 cs.CL

Dual Hierarchical Dialogue Policy Learning for Legal Inquisitive Conversational Agents

Pith reviewed 2026-05-19 13:43 UTC · model grok-4.3

classification 💻 cs.CL
keywords Inquisitive Conversational AgentsDual Hierarchical Reinforcement LearningLegal Dialogue SystemsProbing QuestionsSupreme Court Oral ArgumentsDialogue Policy LearningInformation Extraction
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The pith

A dual hierarchical reinforcement learning framework lets agents learn to ask probing questions that emulate judicial patterns and extract key legal information.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

Most dialogue systems simply respond to user requests, yet many real-world tasks require an agent to actively draw out information to reach its own goals. This paper introduces Inquisitive Conversational Agents and builds one for U.S. Supreme Court oral arguments. It presents a dual hierarchical reinforcement learning setup in which two cooperating agents share the work: one manages high-level dialogue strategy while the other produces specific utterances. The agents learn, through rewards, when and how to pose questions that mirror effective judicial questioning and thereby uncover facts needed for legal objectives. On a Supreme Court dataset the approach beats several baselines on standard performance measures.

Core claim

We propose a Dual Hierarchical Reinforcement Learning framework featuring two cooperating RL agents, each with its own policy, to coordinate strategic dialogue management and fine-grained utterance generation. By learning when and how to ask probing questions, the agent emulates judicial questioning patterns and systematically uncovers crucial information to fulfill its legal objectives.

What carries the argument

Dual Hierarchical Reinforcement Learning framework consisting of two cooperating agents, one for strategic dialogue management and one for fine-grained utterance generation.

If this is right

  • The learned policies allow the agent to emulate judicial questioning patterns and systematically gather crucial facts.
  • The method outperforms various baselines across multiple metrics on the U.S. Supreme Court dataset.
  • The framework marks an initial step toward high-stakes, domain-specific applications that require proactive information extraction.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same two-agent coordination could be tried in medical or financial dialogues where an agent must gather sensitive history without direct user prompting.
  • Pairing the hierarchical policies with a large pre-trained language model might raise the fluency and relevance of the generated questions.
  • Live interactive simulations with human lawyers could test whether the learned strategies hold up when the other speaker deviates from training data patterns.

Load-bearing premise

The U.S. Supreme Court oral arguments dataset contains representative examples of effective judicial questioning that the dual RL agents can learn to replicate through reward signals.

What would settle it

A held-out test on Supreme Court dialogues in which the dual-agent system shows no improvement over baselines in metrics that track information uncovered or quality of probing questions.

Figures

Figures reproduced from arXiv: 2605.14057 by Grace Hui Yang, Shihao Wang, Xubo Lin, Yang Deng, Zezhi Deng.

Figure 1
Figure 1. Figure 1: While this paper focuses on inquisitive dia [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: System Architecture of the Proposed Dual Hierarchical Inquisitive Conversational Agent. [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Coverage Score results [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: MR Score results 5.2 Main Results In this section, we test our method and all base￾lines on the US Supreme Court dataset and com￾pare their effectiveness in terms of the evaluation metrics. Detailed results are shown in [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: A template of google form for manual label [PITH_FULL_IMAGE:figures/full_fig_p016_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Justice uses a counterexample to challenge [PITH_FULL_IMAGE:figures/full_fig_p017_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Justice continuously pressing attorney by [PITH_FULL_IMAGE:figures/full_fig_p017_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Learning Curves from Ablation Study. (a) Cumulative reward during early training stage; (b) Cumulative [PITH_FULL_IMAGE:figures/full_fig_p018_8.png] view at source ↗
read the original abstract

Most existing dialogue systems are user-driven, primarily designed to fulfill user requests. However, in many critical real-world scenarios, a conversational agent must proactively extract information to achieve its own objectives rather than merely respond. To address this gap, we introduce Inquisitive Conversational Agents (ICAs) and develop an ICA specifically tailored to U.S. Supreme Court oral arguments. We propose a Dual Hierarchical Reinforcement Learning framework featuring two cooperating RL agents, each with its own policy, to coordinate strategic dialogue management and fine-grained utterance generation. By learning when and how to ask probing questions, the agent emulates judicial questioning patterns and systematically uncovers crucial information to fulfill its legal objectives. Evaluations on a U.S. Supreme Court dataset show that our method outperforms various baselines across multiple metrics. It represents an important first step toward broader high-stakes, domain-specific applications.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript introduces Inquisitive Conversational Agents (ICAs) for proactive information extraction in high-stakes settings, focusing on U.S. Supreme Court oral arguments. It proposes a Dual Hierarchical Reinforcement Learning framework with two cooperating RL agents—one for strategic dialogue management and one for fine-grained utterance generation—to learn when and how to ask probing questions that emulate judicial patterns and uncover crucial information. The central empirical claim is that this approach outperforms various baselines across multiple metrics on a U.S. Supreme Court dataset.

Significance. If the empirical results and reward design hold under scrutiny, the dual hierarchical RL coordination for objective-driven dialogue could advance proactive conversational agents in legal and similar domains. The framework's separation of high-level strategy from utterance generation offers a structured way to handle complex, multi-turn objectives without relying solely on user-driven responses.

major comments (2)
  1. [Abstract] Abstract: The assertion that 'our method outperforms various baselines across multiple metrics' supplies no quantitative results, baseline descriptions, evaluation metrics, statistical significance tests, or controls. This directly undermines verification of the central empirical claim and must be addressed with full experimental details.
  2. [Method] Method (reward design, likely §4): The reward signals used to train the agents on 'systematically uncovers crucial information' are not shown to be definable from raw dialogue turns or generic success metrics alone. If the rewards incorporate hand-crafted legal features, issue coverage heuristics, or expert-derived labels, this contradicts the claim of learning judicial questioning patterns without extensive additional supervision or domain rules.
minor comments (2)
  1. [Abstract] Abstract: Specify the size, preprocessing, and annotation details of the U.S. Supreme Court oral arguments dataset, including how 'crucial information' is operationalized for evaluation.
  2. [Method] Clarify the exact coordination mechanism between the two RL agents (e.g., shared state, hierarchical action selection, or joint optimization) to make the dual-policy architecture reproducible.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We appreciate the referee's detailed review and constructive suggestions for improving our manuscript. Below, we provide point-by-point responses to the major comments. We have revised the manuscript to address the concerns raised where possible.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The assertion that 'our method outperforms various baselines across multiple metrics' supplies no quantitative results, baseline descriptions, evaluation metrics, statistical significance tests, or controls. This directly undermines verification of the central empirical claim and must be addressed with full experimental details.

    Authors: The abstract serves as a concise summary and space limitations prevent inclusion of full details. The complete experimental results, including quantitative metrics, baseline descriptions, evaluation metrics, and statistical significance tests, are detailed in Section 5. We will revise the abstract to incorporate key quantitative findings to better support the central claim. revision: yes

  2. Referee: [Method] Method (reward design, likely §4): The reward signals used to train the agents on 'systematically uncovers crucial information' are not shown to be definable from raw dialogue turns or generic success metrics alone. If the rewards incorporate hand-crafted legal features, issue coverage heuristics, or expert-derived labels, this contradicts the claim of learning judicial questioning patterns without extensive additional supervision or domain rules.

    Authors: The reward design uses only generic metrics computable from raw dialogue turns, such as the degree to which key information is uncovered in the conversation. No hand-crafted features or expert labels are involved; the dataset provides the basis for evaluating success. We will add a subsection detailing the reward computation to clarify this aspect and resolve any ambiguity. revision: yes

Circularity Check

0 steps flagged

No circularity: independent empirical proposal with no self-referential derivations

full rationale

The paper proposes a Dual Hierarchical Reinforcement Learning framework for Inquisitive Conversational Agents as a novel architecture, with two cooperating RL agents for dialogue management and utterance generation. It evaluates this on a U.S. Supreme Court oral arguments dataset and reports outperformance over baselines. No equations, fitted parameters renamed as predictions, or load-bearing self-citations appear in the provided text. The central claim is an independent modeling choice and empirical result rather than a quantity derived from its own inputs by construction, satisfying the self-contained criterion.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Based on the abstract alone, no free parameters, axioms, or invented entities are explicitly detailed. Standard RL assumptions such as reward design are likely present but unspecified.

pith-pipeline@v0.9.0 · 5677 in / 1167 out tokens · 119231 ms · 2026-05-19T13:43:41.872062+00:00 · methodology

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Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

  • IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    Dual Hierarchical Reinforcement Learning framework featuring two cooperating RL agents... reward comprising Solicitation of Goal-Relevant Information, Novelty, Succinct Answer... three-level hierarchical action taxonomy

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Reference graph

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