pith. machine review for the scientific record. sign in

arxiv: 2605.14026 · v1 · submitted 2026-05-13 · 💻 cs.LG · cs.AI

Recognition: 2 theorem links

· Lean Theorem

R2R2: Robust Representation for Intensive Experience Reuse via Redundancy Reduction in Self-Predictive Learning

Authors on Pith no claims yet

Pith reviewed 2026-05-15 05:36 UTC · model grok-4.3

classification 💻 cs.LG cs.AI
keywords reinforcement learningself-predictive learningrepresentation regularizationoverfittingdata reusecontinuous controlUTD ratioredundancy reduction
0
0 comments X

The pith

A non-centered objective in self-predictive learning resolves zero-centering conflicts to stabilize representations under intensive experience reuse.

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

In data-scarce reinforcement learning, high update-to-data ratios enable repeated use of limited experience but trigger overfitting through unstable representations in self-predictive learning. The paper identifies that standard zero-centering of features clashes with the spectral properties required for stable self-prediction. R2R2 introduces a non-centered regularization objective to reduce redundancy in the learned representations. Experiments across eleven continuous control tasks show that this change improves TD7 by roughly 22 percent at a UTD ratio of 20 and adds further gains when integrated with an enhanced SimbaV2 baseline.

Core claim

R2R2 identifies a conflict between standard zero-centering and the spectral properties of self-predictive learning, then replaces it with a non-centered objective that reduces representation redundancy and thereby mitigates overfitting during high-ratio experience reuse.

What carries the argument

Non-centered regularization objective within self-predictive learning that aligns with spectral properties to reduce redundancy in representations.

Load-bearing premise

The conflict between zero-centering and SPL spectral properties is the primary driver of representation instability, and the non-centered objective is what produces the observed performance gains.

What would settle it

An experiment that changes only the centering term in the SPL objective and measures no improvement in performance or stability at UTD ratio 20 would falsify the central claim.

Figures

Figures reproduced from arXiv: 2605.14026 by Donghyeok Lee, Jinsik Kim, Sanghyeob Song, Sungroh Yoon.

Figure 1
Figure 1. Figure 1: Performance comparison across UTD ratios 1, 10, and 20. Our method demonstrates robustness with minimal loss or gains in high UTD regimes. Notably, our proposed SimbaV2- SPL outperforms the current state-of-the-art, SimbaV2 (Lee et al., 2025b), and R2R2 achieves further performance gains on top of this enhanced baseline. methods (Sutton, 1990; Janner et al., 2019; Ha & Schmidhu￾ber, 2018) have done so by g… view at source ↗
Figure 2
Figure 2. Figure 2: Overview of R2R2. The figure illustrates our proposed framework where direct regularization is applied to the latent rep￾resentation zt. This explicitly stabilizes feature learning. The detailed proof is provided in Appendix A.2. Proposition 2 suggests that even if the representation Φ successfully aligns with u1 to capture the global information of transition dynamics, the application of zero-centering ma… view at source ↗
Figure 3
Figure 3. Figure 3: SimbaV2-SPL. We augment the backbone with a tai￾lored SPL module (encoder ϕ, predictor T ). The Actor and Critic networks are adapted to align with the SimbaV2 architecture, en￾suring seamless integration of latent representations. vation of raw information—particularly high-frequency de￾tails—that might be lost during encoding, we maintain the original state as a parallel input to the actor-critic network… view at source ↗
Figure 4
Figure 4. Figure 4: Aggregated score curves of TD7 and R2R2. Solid lines and shaded regions represent the mean and 95% confidence intervals, respectively. Our approach significantly outperforms the baseline at UTD=20 while maintaining comparable performance at UTD=1 [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: The singular value spectrum. (Left) At UTD = 1, R2R2 shows a steeper initial decay. (Right) At UTD = 20, baseline suffers from spectral cutoff in the tail indices. regime, R2R2 shows a steeper initial decay compared to the baseline, resulting in a lower Effective Rank (ER ≈ 65.0 vs. 76.5). This indicates spectral concentration, where the model filters out redundant signals to compress task-relevant informa… view at source ↗
Figure 7
Figure 7. Figure 7: Effective Rank (ER) over training steps. Evaluated on Humanoid-Run at UTD = 20. (Left) Comparison among the TD7 baseline, R2R2, and R2R2 with the zero-centering constraint. (Right) Comparison on the SimbaV2+SPL backbone with and without R2R2, demonstrating complementarity. 8 [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Learning curves for TD7 baseline. 20 [PITH_FULL_IMAGE:figures/full_fig_p020_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Learning curves for Minimalist ϕ baseline. 23 [PITH_FULL_IMAGE:figures/full_fig_p023_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Learning curves for TD7+LN baseline. 26 [PITH_FULL_IMAGE:figures/full_fig_p026_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Learning curves for SimbaV2 baseline. 29 [PITH_FULL_IMAGE:figures/full_fig_p029_11.png] view at source ↗
read the original abstract

For reinforcement learning in data-scarce domains like real-world robotics, intensive data reuse enhances efficiency but induces overfitting. While prior works focus on critic bias, representation-level instability in Self-Predictive Learning (SPL) under high Update-to-Data (UTD) regimes remains underexplored. To bridge this gap, we propose Robust Representation via Redundancy Reduction (R2R2), a regularization method within SPL. We theoretically identify that standard zero-centering conflicts with SPL's spectral properties and design a non-centered objective accordingly. We verify R2R2 on SPL-native algorithms like TD7. Furthermore, to demonstrate its orthogonality to prior advancements, we extend the state-of-the-art SimbaV2, which originally lacks SPL, by integrating a tailored SPL module, termed SimbaV2-SPL. Experiments across 11 continuous control tasks confirm that R2R2 effectively mitigates overfitting; specifically, at a UTD ratio of 20, it improves TD7 by ~22% and provides additional gains on top of SimbaV2-SPL, which itself establishes a new state-of-the-art. The code can be found at: https://github.com/songsang7/R2R2

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 / 1 minor

Summary. The manuscript claims to identify a conflict between standard zero-centering and SPL spectral properties, introduces R2R2 as a non-centered regularization within Self-Predictive Learning to mitigate representation instability under high Update-to-Data ratios, and reports empirical gains including ~22% improvement on TD7 at UTD=20 plus additional benefits when extending SimbaV2 to SimbaV2-SPL, establishing a new state-of-the-art across 11 continuous control tasks.

Significance. If the performance gains can be causally attributed to the non-centered objective through controlled experiments, this would represent a targeted and practical advance in representation learning for data-scarce RL settings such as robotics, where intensive experience reuse is essential. The claimed orthogonality to prior methods like SimbaV2 and the public code release are positive factors for adoption and verification.

major comments (2)
  1. Abstract: The theoretical identification of the zero-centering/SPL spectral conflict is asserted without derivation steps or supporting equations, leaving the motivation for the non-centered objective difficult to evaluate independently.
  2. Experiments section: No ablations are presented that toggle only the centering term while holding fixed all other factors (network architecture, optimizer, replay buffer sampling, etc.), so the ~22% TD7 lift at UTD=20 cannot yet be attributed specifically to R2R2 rather than other implementation choices.
minor comments (1)
  1. The notation for the R2R2 objective could be presented more explicitly with a dedicated equation block to clarify the redundancy-reduction term.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback. We address the two major comments below and will revise the manuscript to improve clarity on the theoretical motivation and to strengthen causal attribution of the reported gains.

read point-by-point responses
  1. Referee: Abstract: The theoretical identification of the zero-centering/SPL spectral conflict is asserted without derivation steps or supporting equations, leaving the motivation for the non-centered objective difficult to evaluate independently.

    Authors: We agree the abstract states the conflict without inline derivation. Section 3.1 of the manuscript contains the spectral analysis (showing that zero-centering forces negative eigenvalues incompatible with the positive semi-definite requirement of the SPL loss), but the steps are not summarized in the abstract. In revision we will insert a concise derivation sketch and the key equations into the abstract or a new paragraph in the introduction, with a pointer to the full proof in Section 3. revision: yes

  2. Referee: Experiments section: No ablations are presented that toggle only the centering term while holding fixed all other factors (network architecture, optimizer, replay buffer sampling, etc.), so the ~22% TD7 lift at UTD=20 cannot yet be attributed specifically to R2R2 rather than other implementation choices.

    Authors: We acknowledge that the current results compare complete R2R2-augmented agents against baselines without an isolated centering ablation. In the revised version we will add a controlled experiment on TD7 at UTD=20 that differs solely in the centering term (standard zero-centering vs. the non-centered R2R2 objective), with all other factors (architecture, optimizer, replay buffer, and sampling) held fixed. This will directly quantify the contribution of the non-centered regularization. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation is self-contained

full rationale

The paper derives the non-centered objective from a theoretical identification of conflict between zero-centering and SPL spectral properties, presented as an independent analysis within the SPL framework. No steps reduce by construction to fitted parameters, self-citations, or prior ansatzes by the authors. Empirical gains on TD7 and SimbaV2-SPL are reported as verification results, not as inputs to the derivation. The chain remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Based on abstract only: the central addition is the non-centered objective derived from an identified spectral conflict; no free parameters, invented entities, or additional axioms are described.

axioms (1)
  • domain assumption Standard zero-centering conflicts with SPL's spectral properties
    Stated as a theoretical identification in the abstract.

pith-pipeline@v0.9.0 · 5536 in / 1045 out tokens · 40736 ms · 2026-05-15T05:36:09.905668+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Lean theorems connected to this paper

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

What do these tags mean?
matches
The paper's claim is directly supported by a theorem in the formal canon.
supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses
The paper appears to rely on the theorem as machinery.
contradicts
The paper's claim conflicts with a theorem or certificate in the canon.
unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

Works this paper leans on

42 extracted references · 42 canonical work pages · 5 internal anchors

  1. [1]

    Lillicrap and Jonathan J

    Timothy P. Lillicrap and Jonathan J. Hunt and Alexander Pritzel and Nicolas Heess and Tom Erez and Yuval Tassa and David Silver and Daan Wierstra , editor =. Continuous control with deep reinforcement learning , booktitle =. 2016 , url =

  2. [2]

    9th International Conference on Learning Representations,

    Denis Yarats and Ilya Kostrikov and Rob Fergus , title =. 9th International Conference on Learning Representations,. 2021 , url =

  3. [3]

    Soft Actor-Critic: Off-Policy Maximum Entropy Deep Reinforcement Learning with a Stochastic Actor , booktitle =

    Tuomas Haarnoja and Aurick Zhou and Pieter Abbeel and Sergey Levine , editor =. Soft Actor-Critic: Off-Policy Maximum Entropy Deep Reinforcement Learning with a Stochastic Actor , booktitle =. 2018 , url =

  4. [4]

    Soft Actor-Critic Algorithms and Applications

    Tuomas Haarnoja and Aurick Zhou and Kristian Hartikainen and George Tucker and Sehoon Ha and Jie Tan and Vikash Kumar and Henry Zhu and Abhishek Gupta and Pieter Abbeel and Sergey Levine , title =. CoRR , volume =. 2018 , url =. 1812.05905 , timestamp =

  5. [5]

    Forty-second International Conference on Machine Learning,

    Hojoon Lee and Youngdo Lee and Takuma Seno and Donghu Kim and Peter Stone and Jaegul Choo , title =. Forty-second International Conference on Machine Learning,. 2025 , url =

  6. [6]

    Sutton and Andrew G

    Richard S. Sutton and Andrew G. Barto , title =. 2018 , url =

  7. [7]

    Devon Hjelm and Aaron C

    Max Schwarzer and Ankesh Anand and Rishab Goel and R. Devon Hjelm and Aaron C. Courville and Philip Bachman , title =. 9th International Conference on Learning Representations,. 2021 , url =

  8. [8]

    Jha and Toshisada Mariyama and Daniel Nikovski , title =

    Kei Ota and Tomoaki Oiki and Devesh K. Jha and Toshisada Mariyama and Daniel Nikovski , title =. Proceedings of the 37th International Conference on Machine Learning,. 2020 , url =

  9. [9]

    Addressing Function Approximation Error in Actor-Critic Methods , booktitle =

    Scott Fujimoto and Herke van Hoof and David Meger , editor =. Addressing Function Approximation Error in Actor-Critic Methods , booktitle =. 2018 , url =

  10. [10]

    Scott Fujimoto and Wei. For. Advances in Neural Information Processing Systems 36: Annual Conference on Neural Information Processing Systems 2023, NeurIPS 2023, New Orleans, LA, USA, December 10 - 16, 2023 , year =

  11. [11]

    Bridging State and History Representations: Understanding Self-Predictive

    Tianwei Ni and Benjamin Eysenbach and Erfan Seyedsalehi and Michel Ma and Clement Gehring and Aditya Mahajan and Pierre. Bridging State and History Representations: Understanding Self-Predictive. The Twelfth International Conference on Learning Representations,. 2024 , url =

  12. [12]

    2021 , url =

    Xinlei Chen and Kaiming He , title =. 2021 , url =. doi:10.1109/CVPR46437.2021.01549 , timestamp =

  13. [13]

    Bootstrap Your Own Latent -

    Jean. Bootstrap Your Own Latent -. Advances in Neural Information Processing Systems 33: Annual Conference on Neural Information Processing Systems 2020, NeurIPS 2020, December 6-12, 2020, virtual , year =

  14. [14]

    The Tenth International Conference on Learning Representations,

    Adrien Bardes and Jean Ponce and Yann LeCun , title =. The Tenth International Conference on Learning Representations,. 2022 , url =

  15. [15]

    Understanding Self-Predictive Learning for Reinforcement Learning , booktitle =

    Yunhao Tang and Zhaohan Daniel Guo and Pierre Harvey Richemond and Bernardo. Understanding Self-Predictive Learning for Reinforcement Learning , booktitle =. 2023 , url =

  16. [16]

    Nature 518(7540):529–533

    Volodymyr Mnih and Koray Kavukcuoglu and David Silver and Andrei A. Rusu and Joel Veness and Marc G. Bellemare and Alex Graves and Martin A. Riedmiller and Andreas Fidjeland and Georg Ostrovski and Stig Petersen and Charles Beattie and Amir Sadik and Ioannis Antonoglou and Helen King and Dharshan Kumaran and Daan Wierstra and Shane Legg and Demis Hassabis...

  17. [17]

    When to Trust Your Model: Model-Based Policy Optimization , booktitle =

    Michael Janner and Justin Fu and Marvin Zhang and Sergey Levine , editor =. When to Trust Your Model: Model-Based Policy Optimization , booktitle =. 2019 , url =

  18. [18]

    Sutton , editor =

    Richard S. Sutton , editor =. Integrated Architectures for Learning, Planning, and Reacting Based on Approximating Dynamic Programming , booktitle =. 1990 , url =. doi:10.1016/B978-1-55860-141-3.50030-4 , timestamp =

  19. [19]

    Recurrent World Models Facilitate Policy Evolution , booktitle =

    David Ha and J. Recurrent World Models Facilitate Policy Evolution , booktitle =. 2018 , url =

  20. [20]

    Ross , title =

    Xinyue Chen and Che Wang and Zijian Zhou and Keith W. Ross , title =. 9th International Conference on Learning Representations,. 2021 , url =

  21. [21]

    The Twelfth International Conference on Learning Representations,

    Aditya Bhatt and Daniel Palenicek and Boris Belousov and Max Argus and Artemij Amiranashvili and Thomas Brox and Jan Peters , title =. The Twelfth International Conference on Learning Representations,. 2024 , url =

  22. [22]

    Wurman and Jaegul Choo and Peter Stone and Takuma Seno , title =

    Hojoon Lee and Dongyoon Hwang and Donghu Kim and Hyunseung Kim and Jun Jet Tai and Kaushik Subramanian and Peter R. Wurman and Jaegul Choo and Peter Stone and Takuma Seno , title =. The Thirteenth International Conference on Learning Representations,. 2025 , url =

  23. [23]

    Proceedings of the 38th International Conference on Machine Learning,

    Jure Zbontar and Li Jing and Ishan Misra and Yann LeCun and St. Proceedings of the 38th International Conference on Machine Learning,. 2021 , url =

  24. [24]

    Sensory communication , volume=

    Possible principles underlying the transformation of sensory messages , author=. Sensory communication , volume=. 1961 , publisher=

  25. [25]

    Emanuel Todorov and Tom Erez and Yuval Tassa , title =. 2012. 2012 , url =. doi:10.1109/IROS.2012.6386109 , timestamp =

  26. [26]

    OpenAI Gym

    Greg Brockman and Vicki Cheung and Ludwig Pettersson and Jonas Schneider and John Schulman and Jie Tang and Wojciech Zaremba , title =. CoRR , volume =. 2016 , url =. 1606.01540 , timestamp =

  27. [27]

    DeepMind Control Suite

    Yuval Tassa and Yotam Doron and Alistair Muldal and Tom Erez and Yazhe Li and Diego de Las Casas and David Budden and Abbas Abdolmaleki and Josh Merel and Andrew Lefrancq and Timothy P. Lillicrap and Martin A. Riedmiller , title =. CoRR , volume =. 2018 , url =. 1801.00690 , timestamp =

  28. [28]

    Hinton , title =

    Ting Chen and Simon Kornblith and Mohammad Norouzi and Geoffrey E. Hinton , title =. Proceedings of the 37th International Conference on Machine Learning,. 2020 , url =

  29. [29]

    Machado and Marc G

    Marlos C. Machado and Marc G. Bellemare and Erik Talvitie and Joel Veness and Matthew J. Hausknecht and Michael Bowling , editor =. Revisiting the Arcade Learning Environment: Evaluation Protocols and Open Problems for General Agents (Extended Abstract) , booktitle =. 2018 , url =. doi:10.24963/IJCAI.2018/787 , timestamp =

  30. [30]

    Proceedings of the 37th International Conference on Machine Learning,

    Michael Laskin and Aravind Srinivas and Pieter Abbeel , title =. Proceedings of the 37th International Conference on Machine Learning,. 2020 , url =

  31. [31]

    Leibo and David Silver and Koray Kavukcuoglu , title =

    Max Jaderberg and Volodymyr Mnih and Wojciech Marian Czarnecki and Tom Schaul and Joel Z. Leibo and David Silver and Koray Kavukcuoglu , title =. 5th International Conference on Learning Representations,. 2017 , url =

  32. [32]

    Thirty-Fifth

    Denis Yarats and Amy Zhang and Ilya Kostrikov and Brandon Amos and Joelle Pineau and Rob Fergus , title =. Thirty-Fifth. 2021 , url =. doi:10.1609/AAAI.V35I12.17276 , timestamp =

  33. [33]

    Representation Learning with Contrastive Predictive Coding

    A. Representation Learning with Contrastive Predictive Coding , journal =. 2018 , url =. 1807.03748 , timestamp =

  34. [34]

    Layer Normalization

    Lei Jimmy Ba and Jamie Ryan Kiros and Geoffrey E. Hinton , title =. CoRR , volume =. 2016 , url =. 1607.06450 , timestamp =

  35. [35]

    The Thirteenth International Conference on Learning Representations,

    Claas Voelcker and Marcel Hussing and Eric Eaton and Amir. The Thirteenth International Conference on Learning Representations,. 2025 , url =

  36. [36]

    Bigger, Regularized, Optimistic: scaling for compute and sample efficient continuous control , booktitle =

    Michal Nauman and Mateusz Ostaszewski and Krzysztof Jankowski and Piotr Milos and Marek Cygan , editor =. Bigger, Regularized, Optimistic: scaling for compute and sample efficient continuous control , booktitle =. 2024 , url =

  37. [37]

    Hinton and Alex Krizhevsky and Ilya Sutskever and Ruslan Salakhutdinov , title =

    Nitish Srivastava and Geoffrey E. Hinton and Alex Krizhevsky and Ilya Sutskever and Ruslan Salakhutdinov , title =. J. Mach. Learn. Res. , volume =. 2014 , url =. doi:10.5555/2627435.2670313 , timestamp =

  38. [38]

    Batch Normalization: Accelerating Deep Network Training by Reducing Internal Covariate Shift , booktitle =

    Sergey Ioffe and Christian Szegedy , editor =. Batch Normalization: Accelerating Deep Network Training by Reducing Internal Covariate Shift , booktitle =. 2015 , url =

  39. [39]

    Adam Paszke and Sam Gross and Francisco Massa and Adam Lerer and James Bradbury and Gregory Chanan and Trevor Killeen and Zeming Lin and Natalia Gimelshein and Luca Antiga and Alban Desmaison and Andreas K. Advances in Neural Information Processing Systems 32: Annual Conference on Neural Information Processing Systems 2019, NeurIPS 2019, December 8-14, 20...

  40. [40]

    James Bradbury and Roy Frostig and Peter Hawkins and Matthew James Johnson and Chris Leary and Dougal Maclaurin and George Necula and Adam Paszke and Jake Vander

  41. [41]

    Lillicrap and Nicolas Heess , title =

    Yuval Tassa and Saran Tunyasuvunakool and Alistair Muldal and Yotam Doron and Siqi Liu and Steven Bohez and Josh Merel and Tom Erez and Timothy P. Lillicrap and Nicolas Heess , title =. CoRR , volume =. 2020 , url =. 2006.12983 , timestamp =

  42. [42]

    Courville and Marc G

    Rishabh Agarwal and Max Schwarzer and Pablo Samuel Castro and Aaron C. Courville and Marc G. Bellemare , editor =. Deep Reinforcement Learning at the Edge of the Statistical Precipice , booktitle =. 2021 , url =