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REVIEW 2 major objections 2 minor 1 cited by

Optimizing the expected maximum return over multiple retries induces stochastic exploration in policy gradient methods without explicit bonuses.

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T0 review · grok-4.3

2026-06-28 23:49 UTC pith:AR4TMWBE

load-bearing objection ReMax and RePPO give a new max-return objective with a derived policy gradient, but the core claim that this produces exploration specifically because of retries rests on a shaky premise. the 2 major comments →

arxiv 2606.00151 v1 pith:AR4TMWBE submitted 2026-05-29 cs.LG cs.AI

Emergence of Exploration in Policy Gradient Reinforcement Learning via Retrying

Soichiro Nishimori , Paavo Parmas , Sotetsu Koyamada , Tadashi Kozuno , Toshinori Kitamura , Shin Ishii , Yutaka Matsuo This is my paper
classification cs.LG cs.AI
keywords reinforcement learningpolicy gradientexplorationReMaxRePPOPPOstochastic policiesreturn uncertainty
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

The paper formalizes the idea that exploration is useful in RL because agents revisit similar states, allowing retries to yield better outcomes or reduce uncertainty. It proposes the ReMax objective, which evaluates a policy based on the expected maximum return from M independent executions while accounting for uncertainty. Optimizing this objective naturally leads to stochastic policies that explore, as higher potential returns from varied actions increase the max. To make this practical, a new policy gradient is derived and implemented in RePPO, which generalizes the retry count to a continuous parameter for tunable exploration. This is validated empirically on MinAtar and Craftax benchmarks where exploration improves without added bonus terms.

Core claim

ReMax is an objective that evaluates a policy by the expected maximum return over M samples, accounting for return uncertainty. Optimizing ReMax induces stochastic exploration as an emergent property without explicit bonus terms. A new policy-gradient formulation is derived for ReMax, and ReMax PPO (RePPO) is introduced as a PPO variant that optimizes ReMax while generalizing the discrete retry count M to a continuous parameter m > 0 for fine-grained control of exploration.

What carries the argument

The ReMax objective, which computes the expected maximum return over M samples of the policy while accounting for return uncertainty, and its policy gradient optimization via RePPO.

Load-bearing premise

Agents benefit from exploration only because they repeatedly encounter similar states, so that trying different actions on retries can improve performance or reduce uncertainty.

What would settle it

Training RePPO on an environment where states are never repeated and checking whether the learned policy remains stochastic or collapses to deterministic greedy behavior would test whether the emergence of exploration depends on state repetition.

Watch this falsifier. Get emailed when new claim-graph text bears on it.

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If this is right

  • Stochastic exploration emerges naturally from optimizing ReMax without needing explicit bonuses.
  • RePPO provides fine-grained control of exploration level via the continuous retry parameter m.
  • The derived policy gradient enables efficient optimization of the ReMax objective within the PPO framework.
  • Exploration improves on MinAtar and Craftax benchmarks compared to standard methods without bonus terms.

Where Pith is reading between the lines

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

  • The ReMax mechanism may clarify why certain policy gradient methods exhibit exploration in repeated-state settings even without added incentives.
  • Generalizing ReMax beyond PPO to other policy optimization algorithms could yield similar emergent exploration effects.
  • The continuous m parameter offers a way to analyze the exploration-exploitation trade-off as a smooth function rather than discrete choices.
  • In environments lacking state repetition the advantage of ReMax over standard objectives may be reduced or absent.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 2 minor

Summary. The paper proposes ReMax, an objective that evaluates policies by the expected maximum return over M independent samples (generalized to continuous m), and claims that optimizing it via a derived policy gradient induces stochastic exploration as an emergent property without explicit bonuses. It introduces RePPO as a PPO variant implementing this objective and reports empirical improvements on MinAtar and Craftax benchmarks.

Significance. If the derivation establishes that the max-over-retries structure specifically drives the exploration (distinct from variance reduction or entropy regularization), the result would offer a new mechanism for exploration in policy gradients. The empirical evaluation on two standard benchmarks provides initial support for practical utility, though the absence of detailed error analysis or ablation on the retry-induced term limits the strength of the claim.

major comments (2)
  1. [Abstract] Abstract and introduction: the foundational premise that 'without such retries, a greedy policy is optimal' is stated without qualification, yet this does not hold in finite-horizon MDPs with unknown dynamics even in acyclic environments (e.g., tree-structured state spaces). The policy-gradient derivation must explicitly isolate the contribution of the max operator from standard exploration effects to substantiate the emergence claim.
  2. The new policy-gradient formulation for ReMax (and its continuous-m generalization in RePPO) is presented as the core technical contribution, but no equation or section is referenced in the provided text showing separation of the retry-induced stochasticity term from ordinary policy-gradient variance. Without this, attribution of exploration to the retry structure remains unverified.
minor comments (2)
  1. [Abstract] The abstract reports results on two benchmarks but supplies no details on number of seeds, statistical significance, or baseline comparisons; these should be added for reproducibility.
  2. Notation for the continuous parameter m and its relation to discrete M should be clarified early, including how the objective reduces in the limit m→1.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed feedback. We address the major comments point by point below and indicate where revisions will be made to the manuscript.

read point-by-point responses

  1. Referee: [Abstract] Abstract and introduction: the foundational premise that 'without such retries, a greedy policy is optimal' is stated without qualification, yet this does not hold in finite-horizon MDPs with unknown dynamics even in acyclic environments (e.g., tree-structured state spaces). The policy-gradient derivation must explicitly isolate the contribution of the max operator from standard exploration effects to substantiate the emergence claim.

    Authors: We agree that the unqualified statement requires clarification. The premise is intended as an intuition for the value of retries when an agent can re-encounter similar states, but it does not universally hold in finite-horizon MDPs with unknown dynamics. We will revise the abstract and introduction to qualify the claim, noting that it applies under the assumption of repeated interactions with comparable states or when dynamics are known and deterministic. We will also ensure the policy-gradient derivation in Section 3 explicitly isolates the max-operator contribution. revision: yes

  2. Referee: [—] The new policy-gradient formulation for ReMax (and its continuous-m generalization in RePPO) is presented as the core technical contribution, but no equation or section is referenced in the provided text showing separation of the retry-induced stochasticity term from ordinary policy-gradient variance. Without this, attribution of exploration to the retry structure remains unverified.

    Authors: Section 3 derives the ReMax policy gradient (Equation 4) and its continuous-m extension. The resulting expression contains an additional term induced by the max over retries that encourages action stochasticity beyond standard REINFORCE variance. To make the separation explicit and address the lack of clear referencing, we will add a dedicated paragraph and equation decomposition in Section 3.2 that isolates the retry-induced stochasticity term from baseline variance effects, with explicit cross-references to the relevant equations. revision: yes

Circularity Check

0 steps flagged

No circularity: ReMax objective and gradient derivation are self-contained from stated intuition.

full rationale

The paper defines ReMax as E[max_{k=1..M} G(τ_k)] from an external intuition about retries, then derives a policy gradient and RePPO variant. No step reduces a claimed prediction to a fitted parameter by construction, no self-citation chain bears the central claim, and the emergence property is presented as a direct consequence of the defined objective rather than renamed or smuggled via prior work. The derivation chain remains independent of its own outputs.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that repeated encounters with similar states make retries useful, plus the mathematical step of deriving a policy gradient for the max-return objective; M/m is the only explicit tunable parameter.

free parameters (1)
  • M (or continuous m)
    Retry count that controls the degree of exploration; generalized from discrete positive integer to continuous m > 0.
axioms (1)
  • domain assumption Agents benefit from exploration only because they repeatedly encounter similar states
    Explicitly stated as the intuition being formalized.

pith-pipeline@v0.9.1-grok · 5709 in / 1131 out tokens · 29541 ms · 2026-06-28T23:49:52.820044+00:00 · methodology

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Cite this review

Pith. "Pith review of Emergence of Exploration in Policy Gradient Reinforcement Learning via Retrying." pith.science (2026). https://pith.science/paper/AR4TMWBE

@misc{pith2026260600151,
  author       = {Pith},
  title        = {Pith review of: Emergence of Exploration in Policy Gradient Reinforcement Learning via Retrying},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/AR4TMWBE}},
  note         = {Machine review of arXiv:2606.00151}
}
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read the original abstract

In reinforcement learning (RL), agents benefit from exploration only because they repeatedly encounter similar states: trying different actions can improve performance or reduce uncertainty; without such retries, a greedy policy is optimal. We formalize this intuition with ReMax, an objective that evaluates a policy by the expected maximum return over $M$ samples, where $M$ is a positive integer, while accounting for return uncertainty. Optimizing this objective induces stochastic exploration as an emergent property, without explicit bonus terms. For efficient policy optimization, we derive a new policy-gradient formulation for ReMax and introduce ReMax PPO (RePPO), a PPO variant that optimizes ReMax while generalizing the discrete retry count $M$ to a continuous parameter $m > 0$, enabling fine-grained control of exploration. Empirically, RePPO promotes exploration, without any explicit exploration bonuses, on the MinAtar and Craftax benchmarks.

Figures

Figures reproduced from arXiv: 2606.00151 by Paavo Parmas, Shin Ishii, Soichiro Nishimori, Sotetsu Koyamada, Tadashi Kozuno, Toshinori Kitamura, Yutaka Matsuo.

Figure 1
Figure 1. Figure 1: Bandit problems. (Left) ReMax objective for a binary bandit. The standard reinforcement learning objective (M = 1) has a deterministic optimal policy (p ∗ = 1); in contrast, increasing the retry count M ≥ 2 shifts the optimal policy toward stochastic exploration to hedge against reward uncertainty. (Center) A plot of how the optimal policy changes as the reward variance changes. While Softmax remains fixed… view at source ↗
Figure 2
Figure 2. Figure 2: Average cumulative regret and standard error over 256 runs. ReMax with M = 2 and M = 3, optimized by gradient ascent. MDPs, M ∼ P(M), capturing (epistemic) uncertainty over unexplored regions of the environment (Ghosh et al., 2021). Retrying in RL would naïvely require multiple roll￾outs from the same state until termination, which is infea￾sible without a resettable simulator (Ecoffet et al., 2021) and of… view at source ↗
Figure 3
Figure 3. Figure 3: MinAtar results. Left: normalized scores aggregated with median, IQM, and mean across four games; boxes denote RLiable summaries over 10 seeds. RePPO, without entropy bonus, outperforms PPO-V, PPO-Q with entropy, and PPO-V + RND. Right: policy entropy during Breakout training. We observe that RePPO keeps high entropy without entropy bonus, indicating the promoted exploration. 0.30 0.45 0.60 0.75 m=0.9 m=1 … view at source ↗
Figure 4
Figure 4. Figure 4: MinAtar results. Effect of retry parameter m. Left: median, IQM, and mean of normalized evaluation return across all games. The best performance occurred around m ∈ [1.2, 1.4]. Right: policy entropy on Breakout. Larger m slowed entropy decay and encouraged exploration, while smaller m leads to faster entropy decay. computation is minimal (see App. E.2). We provide the advantage computation code in App. D. … view at source ↗
Figure 5
Figure 5. Figure 5: MinAtar results. Median (all games). The results show that either removing the action-independent baseline or the Q￾replacement strategy substantially degrades performance. the learning rate) to match the number of gradient updates. Additional comparisons with the unmodified PQN hyper￾parameters (yielding ∼5× more updates) are provided in App. E.2. Full hyperparameters are listed in App. E.1. Training and … view at source ↗
Figure 6
Figure 6. Figure 6: Per-game learning curves, ordered as Breakout, Asterix, Freeway, and Space Invaders. Mean ± s.e. over 10 seeds. E. MinAtar Experiment In this appendix, we provide additional details on the MinAtar experiment. E.1. Experimental setup Network architecture. We use the same network architecture as the public implementations of PPO and PQN (official implementation). PPO (Actor–Critic). A shared CNN (Conv 2×2 + … view at source ↗
Figure 7
Figure 7. Figure 7: Aggregate metrics (Median, IQM, Mean) across all games. 0.0 0.2 0.4 0.6 0.8 1.0 Env Step (M) £10 7 0.2 0.4 0.6 0.8 1.0 Entropy (a) Breakout 0.0 0.2 0.4 0.6 0.8 1.0 Env Step (M) £10 7 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Entropy (b) Asterix 0.0 0.2 0.4 0.6 0.8 1.0 Env Step (M) £10 7 0.0 0.2 0.4 0.6 0.8 1.0 Entropy (c) Freeway 0.0 0.2 0.4 0.6 0.8 1.0 Env Step (M) £10 7 0.4 0.6 0.8 1.0 1.2 1.4 Entropy m=0.9 m=1 m=… view at source ↗
Figure 8
Figure 8. Figure 8: Policy entropy for all environments over m ∈ {0.9, 1.0, 1.2, 1.4, 1.6, 2, 3}, ordered as Breakout, Asterix, Freeway, and Space Invaders. Per-game results [PITH_FULL_IMAGE:figures/full_fig_p023_8.png] view at source ↗
Figure 9
Figure 9. Figure 9 [PITH_FULL_IMAGE:figures/full_fig_p023_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Standard deviation of the EI-based advantage on Breakout. We observe that retry parameters that performed well in our experiments, such as m = 1.2 and m = 1.4, tend to yield smaller advantage standard deviations than a less exploratory setting such as m = 0.9. This suggests that the same range of m that promotes exploration can also produce a more stable EI-based advantage signal on Breakout. We emphasize… view at source ↗
Figure 11
Figure 11. Figure 11: Normalized scores aggregated with median, IQM, and mean across 10 games; boxes denote RLiable summaries over 5 seeds. For RePPO, we see the performance peak around m = 0.9 to 1.0, and PPO without entropy performs better than that with entropy. This indicates that those environments indeed require less exploration. F. Atari Experiment We use the 10 Atari environments identified as dense-reward, hard-explor… view at source ↗
Figure 12
Figure 12. Figure 12: Plot of the return curves for all games. Mean ± s.e. over 5 seeds. Overall, PPO without entropy and RePPO with m = 0.9 and 1.0 perform better than that with entropy and RePPO with m = 1.2 and 1.4. This indicates that those environments indeed require less exploration. 0.0 0.2 0.4 0.6 0.8 1.0 Env Step (M)£10 7 0.5 1.0 1.5 2.0 2.5 3.0 Entropy Alien m=0.8 m=0.9 m=1.0 m=1.2 m=1.4 PPO-V + Ent PPO-V 0.0 0.2 0.4… view at source ↗
Figure 13
Figure 13. Figure 13: Policy entropy during training on all games. Mean ± s.e. over 5 seeds. RePPO with m = 1.2 and 1.4 maintains higher entropy, while that with m = 0.9 and 1.0 exhibits faster entropy decay, demonstrating the RePPO’s ability to control the trade-off between exploration and exploitation. G. Craftax Experiment Hyperparameters. For PPO-V and PPO-V + RND (RND), we used the same hyperparameters as in the original … view at source ↗
Figure 14
Figure 14. Figure 14: Entropy (Craftax) [PITH_FULL_IMAGE:figures/full_fig_p026_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Average training time of RePPO and baseline methods. regularization or an additional intrinsic-reward model. H. Speed Benchmark MinAtar. We compare the training speed of RePPO, PPO-V, and PPO-Q in MinAtar. Fig. 15a reports the average wall-clock time on Breakout for 10M timesteps (no evaluation), averaged over 5 seeds. Hyperparameters match Sec. 5. Since our implementation uses the JAX framework, we exclu… view at source ↗

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