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REVIEW 2 major objections 1 minor 54 references

JOMP: Jointly-Optimized Mixed-Precision Quantization Across Neural Video Coding Frameworks and Buffering Strategies

T0 review · 2 major / 1 minor · reviewed 2026-06-27 · grok-4.3

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Pith's one-line read JOMP makes bit widths learnable variables so neural video codecs can train end-to-end in mixed-precision integer arithmetic.

desk verdict JOMP treats bit widths as learnable variables for mixed-precision integer neural video codecs and claims 87% bit-op cuts with DCVC-FM level RD, but the abstract supplies no training details, ablations, or stability checks. read the letter →

arxiv 2606.13110 v1 pith:PVVYO4BW submitted 2026-06-11 eess.IV

Yu-Hsiang Lin , Ruhan Conceição , Chun-Hung Wu , Huu-Tai Phung , Tzu-Hsiang Chou , Marcelo Porto , Luciano Volcan Agostini , Wen-Hsiao Peng This is my paper · ORCID
classification eess.IV
keywords mixed-precisionquantizationneuralvideocodingintegercodecsrate-distortion-complexitytrade-offvariationalautoencodertemporalbufferingstrategiesend-to-endoptimizationdeterministicdecoding
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper introduces JOMP to solve the gap between high-performing floating-point neural video codecs and practical integer deployments. It treats quantization parameters and bit widths as jointly learnable during training, so modules inside a codec can run at different precisions while the rate-distortion-complexity trade-off is optimized directly. Experiments apply the method across multiple coding frameworks and temporal buffering strategies, and include a full integerization pipeline that produces deterministic decoding. When used on the strongest model, the resulting integer codec matches the rate-distortion performance of the floating-point state-of-the-art DCVC-FM while cutting bit operations by 87.6 percent.

What carries the argument

The JOMP framework, in which quantization parameters and bit widths are optimized jointly as learnable variables during training.

What would settle it

A controlled test in which the learned bit-width assignments from JOMP require extensive per-framework retraining or post-processing to reach the reported rate-distortion performance.

Watch

Extended reading notes

Core claim

By treating both quantization parameters and bit widths as learnable variables, JOMP performs end-to-end mixed-precision optimization for neural video codecs. This produces integer implementations whose rate-distortion performance is comparable to DCVC-FM while reducing bit operations by 87.6 percent. The same framework also supplies a complete integerization pipeline that guarantees deterministic decoding.

Load-bearing premise

Making bit widths learnable during training produces stable mixed-precision assignments that generalize across frameworks without post-training retuning.

Editorial extensions

If this is right

  • Different codec modules can run at different precision levels while the overall rate-distortion-complexity optimum is found automatically.
  • A single training procedure works across multiple neural video coding frameworks and temporal buffering strategies.
  • Integer neural video codecs become feasible with deterministic decoding and no floating-point arithmetic at inference time.
  • Bit-operation count can be reduced by 87.6 percent while rate-distortion performance stays comparable to the strongest floating-point baseline.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The same joint-optimization idea could be tested on other neural compression domains such as image or point-cloud coding.
  • Hardware designers could use the learned precision maps to allocate specialized low-precision arithmetic units inside video codecs.
  • The method may reduce the need for separate quantization-aware training pipelines when new buffering strategies are introduced.
  • If the learned bit widths prove stable across datasets, future codec standards could publish precision maps instead of full floating-point weights.
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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 / 1 minor

Summary. The paper claims to introduce JOMP, the first mixed-precision quantization framework for neural video codecs, in which both quantization parameters and bit widths are treated as learnable variables during end-to-end training. It validates effectiveness via a systematic investigation across coding frameworks and temporal buffering strategies, develops a complete integerization pipeline for deterministic decoding, and reports that application to the best-performing model yields RD performance comparable to DCVC-FM while reducing bit operations by 87.6%.

Significance. If the central claims hold under rigorous validation, the work would meaningfully advance practical deployment of neural video codecs by addressing high computational complexity through mixed-precision integer arithmetic. The systematic cross-framework and cross-buffering study could provide a unified perspective on practicality considerations, and the integerization pipeline represents a concrete contribution toward reproducible integer implementations.

major comments (2)
  1. [Abstract] Abstract: the central claim of RD performance comparable to DCVC-FM with an 87.6% bit-operation reduction is presented without experimental details, baselines, variance across seeds, or ablation results on the joint optimization; this directly prevents assessment of whether the learnable bit-width procedure produces stable and generalizable assignments as required by the weakest assumption.
  2. [§3] Training procedure (assumed §3): no description is given of the relaxation technique for bit-width variables (e.g., straight-through estimator or Gumbel-softmax), auxiliary losses, or monitoring for collapse/variance, which is load-bearing for the assertion that end-to-end training directly yields usable mixed-precision integer codecs without post-training retuning.
minor comments (1)
  1. [Introduction] The novelty statement that JOMP is the first mixed-precision framework for neural video codecs would benefit from an explicit comparison table against prior mixed-precision methods applied to other neural codecs or vision models.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed review. We address each major comment below and indicate the planned revisions.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim of RD performance comparable to DCVC-FM with an 87.6% bit-operation reduction is presented without experimental details, baselines, variance across seeds, or ablation results on the joint optimization; this directly prevents assessment of whether the learnable bit-width procedure produces stable and generalizable assignments as required by the weakest assumption.

    Authors: We acknowledge that the abstract presents the central claim at a high level without sufficient supporting details. In the revised manuscript, we will expand the abstract to include brief references to the experimental setup (including the DCVC-FM baseline), the sections reporting variance across seeds, and the ablation studies on joint optimization. This will enable readers to more readily assess the stability and generalizability of the learnable bit-width assignments. revision: yes

  2. Referee: [§3] Training procedure (assumed §3): no description is given of the relaxation technique for bit-width variables (e.g., straight-through estimator or Gumbel-softmax), auxiliary losses, or monitoring for collapse/variance, which is load-bearing for the assertion that end-to-end training directly yields usable mixed-precision integer codecs without post-training retuning.

    Authors: We agree that the manuscript lacks an explicit description of the relaxation technique and related training details for the bit-width variables. In the revised version, we will expand the training procedure section to describe the specific relaxation method used, any auxiliary losses, and the monitoring procedures employed to detect collapse or excessive variance. This addition will strengthen the support for the end-to-end training claim. revision: yes

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: JOMP is an empirical training procedure with independent results

full rationale

The paper introduces JOMP as a method treating quantization parameters and bit widths as learnable variables in end-to-end training for integer neural video codecs. It reports empirical outcomes (RD parity to DCVC-FM, 87.6% bit-op reduction) from systematic experiments across frameworks and buffering strategies. No derivation, equation, or claim reduces by construction to fitted inputs or self-citations; the central results are outputs of the described optimization, not tautological renamings or forced predictions. Self-contained against external benchmarks with no load-bearing self-referential steps.

Assumptions & free parameters 0 free parameters · 1 assumptions · 0 invented entities

The central claim rests on the differentiability of the quantization operation when bit widths are treated as learnable parameters and on the assumption that standard gradient-based training will converge to useful mixed-precision assignments; no new entities or fitted constants are introduced in the abstract.

assumptions (1)
  • domain assumption Quantization operations can be made differentiable so that bit widths become trainable parameters via backpropagation.
    Required for the joint optimization described; location implied in the training procedure.

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Cite this review

Pith. "Pith review of JOMP: Jointly-Optimized Mixed-Precision Quantization Across Neural Video Coding Frameworks and Buffering Strategies." pith.science (2026). https://pith.science/paper/PVVYO4BW

@misc{pith2026260613110,
  author       = {Pith},
  title        = {Pith review of: JOMP: Jointly-Optimized Mixed-Precision Quantization Across Neural Video Coding Frameworks and Buffering Strategies},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/PVVYO4BW}},
  note         = {Machine review of arXiv:2606.13110}
}
read the original abstract

Variational autoencoder-based neural video coding has demonstrated impressive rate-distortion performance. However, its adoption in real-world applications remains hindered by challenges, such as prohibitively high computational complexity and limited cross-platform interoperability. These issues are often overlooked, as most neural video codecs rely on floating-point arithmetic to fully explore their rate-distortion potential. Practical deployment, however, requires integer-based implementations. Converting floating-point implementations into integer-based networks is non-trivial, since it involves quantizing inter-dependent coding components, whose sensitivity to precision may vary across codec designs. This paper introduces a Jointly-Optimized Mixed-Precision (JOMP) framework, in which both quantization parameters and bit widths are treated as learnable variables during training. This enables different codec modules to operate at varying precision levels, thereby jointly optimizing the rate-distortion-complexity trade-off. To the best of our knowledge, JOMP is the first mixed-precision quantization framework for neural video codecs. Its effectiveness is validated through a systematic investigation of quantization across different coding frameworks and temporal buffering strategies. Our study marks the first attempt to a unified understanding of the combined effects of modern coding frameworks and temporal buffering strategies, with the aim of informing future development of neural video codecs from a practicality perspective. In addition, we develop a complete integerization pipeline to achieve deterministic decoding. Overall, when applied to our best-performing model, JOMP enables end-to-end mixed-precision learning for integer neural video codecs, achieving rate-distortion performance comparable to that of the state-of-the-art DCVC-FM while reducing bit operations by 87.6%.

Figures

Figures reproduced from arXiv: 2606.13110 by the authors.

Figure 1
Figure 1. Motivation and overview of our work. (a) Floating-point decoding may [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Overview of NVC design variants considered in this work. (a) Dif [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Illustration of a symmetric, uniform, and scalar quantization scheme [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figures from the paper (9 more)
Figure 4
Figure 4. Figure 4: Comparison between fake-quantization and fully integerized convolu [PITH_FULL_IMAGE:figures/full_fig_p005_4.png]
Figure 5
Figure 5. Figure 5: Overview of the quantization framework. (a) Decoder-side quantization architecture based on the MCR Hybrid framework. We apply quantization [PITH_FULL_IMAGE:figures/full_fig_p006_5.png]
Figure 6
Figure 6. Figure 6: Complexity-precision relationship across all model variants at [PITH_FULL_IMAGE:figures/full_fig_p010_6.png]
Figure 7
Figure 7. Figure 7: BD-rate increase (%) versus decoder complexity (BitOPs) introduced by JOMP for different model variants. Each point represents the performance [PITH_FULL_IMAGE:figures/full_fig_p011_7.png]
Figure 8
Figure 8. Figure 8: BD-rate (%) versus decoder complexity (BitOPs) for all model variants, including both FP32 and JOMP configurations. The Pareto frontier is [PITH_FULL_IMAGE:figures/full_fig_p011_8.png]
Figure 9
Figure 9. Figure 9: Rate-distortion-complexity trade-off curves comparing the JOMP [PITH_FULL_IMAGE:figures/full_fig_p012_9.png]
Figure 10
Figure 10. Figure 10: Rate-distortion comparison with the state-of-the-art NVCs. The anchor is VTM 17.0 (Low-delay B). [PITH_FULL_IMAGE:figures/full_fig_p016_10.png]
Figure 11
Figure 11. Figure 11: Visual comparison of reconstructed frames from the [PITH_FULL_IMAGE:figures/full_fig_p017_11.png]
Figure 12
Figure 12. Figure 12: Visual comparison of reconstructed frames from the [PITH_FULL_IMAGE:figures/full_fig_p017_12.png]

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    Dr. Peng is a Fellow of the Higher Education Academy (FHEA), and a Fellow of the IEEE. 15 JOMP: Jointly-Optimized Mixed-Precision Quantization Across Neural Video Coding Frameworks and Buffering Strategies Supplementary Material X. DERIVATION OFGRADIENTS This section provides ...

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    Case 1:Q − b < u < Q + b : ˆv=⌊u⌉ ·s ∂ˆv ∂v+ =⌊u⌉ · ∂s ∂v+ +s· ∂⌊u⌉ ∂v+ =⌊u⌉ · ∂ ∂v+ v+ Q+ b +s· ∂ ∂v+ v· Q+ b v+ =⌊u⌉ · 1 Q+ b −s· v·Q + b (v+)2 = ⌊u⌉ Q+ b − u Q+ b = ⌊u⌉ −u Q+ b

  42. [50]

    Case 2:u≤Q − b : ˆv=Q− b ·s=Q − b · v+ Q+ b ∂ˆv ∂v+ = Q− b Q+ b

  43. [51]

    Gradient w.r.t

    Case 3:u≥Q + b : ˆv=Q+ b ·s=Q + b · v+ Q+ b =v + ∂ˆv ∂v+ = 1 B. Gradient w.r.t. Continuous Bit Width ˜b

  44. [52]

    Case 1:Q − b < u < Q + b : ˆv=⌊u⌉ ·s ∂ˆv ∂˜b =⌊u⌉ · ∂s ∂˜b +s· ∂⌊u⌉ ∂˜b = (v−ˆv)× 2˜b−1 ln 2 Q+ b where ⌊u⌉ · ∂s ∂˜b =⌊u⌉ · ∂ ∂˜b v+ Q+ b =⌊u⌉ ·v + ·(−1)(Q + b )−2 · ∂Q+ b ∂˜b =⌊u⌉ · v+ Q+ b · −1 Q+ b · ∂Q+ b ∂˜b = −ˆv Q+ b · ∂Q+ b ∂˜b , s· ∂⌊u⌉ ∂˜b = v+ Q+ b · ∂ ∂˜b v· Q+ b v...

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    Case 2:u≤Q − b : ˆv=Q− b ·s=Q − b · v+ Q+ b ∂ˆv ∂˜b = ∂ ∂˜b v+ Q− b Q+ b =v + · Q+ b · ∂Q− b ∂˜b −Q − b · ∂Q+ b ∂˜b (Q+ b )2 =v + · Q+ b ·(−2 ˜b−1 ln 2)−Q − b ·(2 ˜b−1 ln 2) (Q+ b )2 =v + · (−Q+ b −Q − b )·2 ˜b−1 ln 2 (Q+ b )2 =v + · 2˜b−1 ln 2 (Q+ b )2 16 0.02 0.03 0.04 0.05 ...

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    ADDITIONALRATE-DISTORTIONCURVES For completeness, Fig

    Case 3:u≥Q + b : ˆv=Q+ b ·s=Q + b · v+ Q+ b =v + ∂ˆv ∂˜b = 0 XI. ADDITIONALRATE-DISTORTIONCURVES For completeness, Fig. 10 presents the full rate-distortion curves of the evaluated methods. XII. VISUALIZATION FORCROSS-PLATFORM CONSISTENCY Fig. 11 further provides a visual comp...

Pith tools

Reviewed June 27, 2026 · model on record in the stance chip above.