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REVIEW 3 major objections 6 minor 56 references

Enhancing Perception Capabilities of Multimodal LLMs with Training-Free Fusion

T0 review · 3 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash

Pith's one-line read VisionFuse claims that fusing same-family MLLMs by concatenating vision tokens and merging delta parameters improves multimodal benchmark scores by over 4% on average, with no training.

desk verdict Training-free fusion of same-family MLLMs is a real and useful trick, but the headline gain is inflated by test-set-tuned hyperparameters. read the letter →

arxiv 2412.01289 v2 pith:GFCA7FEC submitted 2024-12-02 cs.CV cs.AI

classification cs.CVcs.AI
keywords multimodallargelanguagemodelstraining-freefusionvisionencoderensembledeltaparametermergingtaskarithmeticvisualperceptionMLLMfamilytokenconcatenation
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

VisionFuse tries to establish that the visual perception of multimodal large language models (MLLMs) can be improved without any training by combining off-the-shelf models that share the same pretrained language model. The paper claims that two operations are enough: concatenate the visual tokens produced by the different models' vision encoders, and merge the language models' delta parameters by weighted interpolation toward their shared base model. Fusing Mini-Gemini-8B and SLIME-8B this way raises average performance by more than 4% over the stronger individual model across nine multimodal benchmarks, at a cost of only 3.4% more parameters from the added encoder. If the claim holds, it matters because it sidesteps the expensive re-alignment step that normally accompanies any new or additional vision encoder.

What carries the argument

The load-bearing mechanism is a two-part, training-free pipeline. A vision ensemble runs each member's preprocessing, encoder, and projector to obtain visual tokens $V_i$, then feeds the concatenation $V_F = [V_1; \dots; V_n]$ into the language model alongside text tokens. In parallel, an LLM-merging step forms $\Theta_{\mathrm{merged}} = \Theta_{\mathrm{pre}} + \lambda \sum_{i=1}^M (\Theta_i - \Theta_{\mathrm{pre}})$, the task-arithmetic rule of adding scaled fine-tuning deltas to the shared base model. The identity that carries the argument is this linear interpolation: it is what aligns one language model with several vision encoders that were never jointly trained, and its validity is what confines the method to a single MLLM family.

What would settle it

Take two same-family MLLMs with deliberately divergent visual preprocessing, for example one crop-based and one patch-based, and large pairwise delta differences; if a tuned $\lambda$ cannot keep TextVQA accuracy above the better individual model, the compatibility premise fails. The paper's own cross-family result, MGM-8B + VILA-8B dropping TextVQA from 67.6 to 33.0, is a partial falsifier; a systematic scan across same-family pairs with measured delta distances would settle how far the claim extends.

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Extended reading notes

Core claim

The central discovery is that within an MLLM family, defined as models built on the same pretrained LLM, two previously separate techniques become compatible: visual-token concatenation and delta-parameter merging. The paper's three observations are that different MLLMs attend to different image regions for the same query, that same-family vision encoders produce feature distributions similar enough to be concatenated into one visual context, and that interpolating the language models' deltas, $\Theta_{\mathrm{merged}} = \Theta_{\mathrm{pre}} + \lambda \sum_i (\Theta_i - \Theta_{\mathrm{pre}})$, lets a single LLM parse tokens from multiple encoders. The authors show that on TextVQA the interpolated model peaks near $\alpha = 0.5$ between the two 8B models, and ablation evidence indicates the gain comes from genuinely richer visual information rather than from longer token sequences, since duplicating one model's tokens does not improve accuracy.

Load-bearing premise

The load-bearing premise is that linearly averaging the fine-tuning differences of same-family models produces a single language model that can interpret every member's visual tokens without any alignment training; the paper establishes this empirically from one family pair and observes that it fails when deltas are large or models come from different families.

Editorial extensions

If this is right

  • Fusing MGM-8B and SLIME-8B outperforms both individual models on every benchmark reported, and reaches parity with MGM-8x7B, a model with over six times as many parameters.
  • Combining a high-resolution encoder (MGM-HD-8B) with a low-resolution one (SLIME-8B) still improves overall accuracy, so the low-resolution encoder supplies complementary information rather than redundancy.
  • Both components are necessary: merging deltas without extra encoders gives small gains, while adding extra encoders without merging deltas hurts alignment and accuracy.
  • Naively concatenating tokens from more than two 7B models degrades performance because sequence lengths exceed the training distribution, but the same three-model fusion on 8B models, or with about 1,000 tokens pruned, improves over the two-model fusion.
  • The recipe transfers beyond the MGM-SLIME pair, improving MGM+Eagle-8B across TextVQA, MMBench, MMMU, Ai2d, OCRBench, and RealworldQA.

Reading between the lines

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

  • If same-family compatibility is the active ingredient, then the useful resource is families of models sharing a base LLM; quantitative measures of delta-parameter distance could predict which pairs will fuse well before running benchmarks.
  • The success of simple $\lambda$-scaled delta interpolation suggests the visual-alignment knowledge in these MLLMs is concentrated in small parameter changes; testing sparse-merging variants, such as pruning or conflict-resolving merges, may make the fusion more robust and cheaper to deploy.
  • The token-length failure mode points to a natural extension the paper leaves open: instead of concatenating all tokens, select a per-encoder subset of the most informative or complementary visual tokens, which could preserve gains while cutting inference cost.
  • Because the authors' cross-family experiments show sharp drops, the method doubles as a probe: a family's merge success rate could serve as an empirical measure of how much two MLLM fine-tunings share in their visual alignment.
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Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

3 major / 6 minor

Summary. VisionFuse is a training-free framework that improves the visual perception of multimodal LLMs by integrating multiple MLLMs that share the same pretrained language model. The method concatenates visual tokens from the vision encoders of several family members and merges their LLM delta parameters as Θₘₑᵣ₉ₑₐ = Θₚᵣₑ + λ·Σ(Θᵢ − Θₚᵣₑ). The central claim is that, without additional training, fusing MiniGemini-8B and SLIME-8B yields an average relative improvement of over 4% across nine multimodal benchmarks, with ablations showing that both token concatenation and LLM merging are necessary. The paper also reports results for 7B models, a high-resolution variant, an Eagle-8B combination, and three-model integration with token pruning.

Significance. If the reported gains are robust, VisionFuse offers a practical, low-overhead route to improving MLLM perception by reusing existing checkpoints, and it provides useful empirical evidence about the compatibility of vision encoders and LLM deltas within an MLLM family. The paper's strengths include consistent improvements across a wide benchmark suite, explicit ablations isolating the two components (Table 2), a negative control showing that simply duplicating tokens does not help (Figure 5), and a striking cross-family failure (Table 9) that supports the family-condition hypothesis. The main reservation is the selection of the merging coefficient λ on the evaluation benchmarks themselves, which affects the credibility of the headline quantitative claim.

major comments (3)
  1. [Appendix A.2, Eq. (4), Figure 4c, Table 1] The merging coefficient λ is selected by maximizing accuracy on TextVQA (Figure 4c), and the hyperparameter search in Table 5 is performed over the same benchmarks that are later averaged in Table 1. The paper does not state that a held-out validation split is used. Because TextVQA is one of the nine benchmarks in the headline average, the reported "over 4%" improvement is partly a consequence of test-set selection. Please either choose λ on a held-out validation set (e.g., a few tasks not in the evaluation suite) or report the full benchmark results across the entire λ range to show that the average improvement is not an artifact of peaking on TextVQA.
  2. [Section 5, Table 1] The average "increase of over 4%" is an arithmetic mean of per-benchmark relative gains that range from +1.0% (MMBench) to +14.7% (Vizwiz), with MME scores and accuracy percentages mixed in the same average. With λ tuned on one of these benchmarks, the mean is not a stable statistic. Please clarify exactly how the average is computed, report the median and the range, and, ideally, provide bootstrap confidence intervals or a sensitivity table across λ to establish the stability of the central claim.
  3. [Appendix D.2, Figure 8c, Table 7] The three-model integration result relies on randomly dropping 1000 visual tokens, and this drop count is selected by maximizing TextVQA accuracy in Figure 8c. This is another free parameter chosen on the evaluation set. The three-model improvement over the two-model baseline should therefore be reported with the same caveat, and a sensitivity analysis over the number of dropped tokens should be provided so that the reader can gauge the robustness of that result.
minor comments (6)
  1. [Section 3, title] The heading "Empircal Insights" appears to be a typo and should read "Empirical Insights."
  2. [Table 3, caption] The word "Comparasions" in the caption should be "Comparisons."
  3. [Appendix D.1] The sentence "This limitation leeds to degraded performance" contains a typo; "leeds" should be "leads."
  4. [Section 5, paragraph on main results] The phrase "in both the the combinations" contains a duplicated article and should be "in both the combinations."
  5. [Figure 4c] Please clarify in the caption whether the accuracy curve corresponds to the merged model with both vision encoders or to a single-encoder model; the text is ambiguous about what is being interpolated.
  6. [Algorithm 1] The comment "Merge language model parameters using Eq. (4)" is placed as a step; consider making it a formal numbered step to match the algorithmic description in the text.

Circularity Check

1 steps flagged · score 4.0 of 10

The reported TextVQA gain is not clearly out-of-sample: the merge coefficient α/λ is selected using TextVQA accuracy, and the same TextVQA column is then part of the headline 4% average; no validation split is described.

  1. fitted input called prediction [Section 3, Observation 3 / Figure 4c; Section 4.3 Eq. (4); Appendix A.2 Table 5; Section 5 Table 1]
    "(c) Accuracy on TextVQA when interpolating MGM and SLIME with different α. … Table 5 shows the searching range of the parameters of sev-eral merging methods."

    The method's only free constant is λ in Eq. (4), Θmerged = Θpre + λ·Σ(Θi − Θpre). For Task Arithmetic, the paper searches λ over {0.1, 0.3, 0.5, 0.7, 0.9, 1.0}, and Observation 3 explicitly selects α by maximizing accuracy on TextVQA. The same TextVQA benchmark then appears in Table 1 as a +3.6% gain for MGM-SLIME-8B and is included in the 'over 4%' average improvement. Because the paper never states that this search was performed on a validation split, the reported TextVQA number is not an independent prediction: it is the result of choosing the coefficient on that very benchmark. At least this component of the headline improvement is a fitted input presented as an achieved result, so the magnitude of the claimed gain is not established by the paper as written.

full rationale

VisionFuse is an empirical integration method rather than a derived first-principles result: token concatenation and delta-parameter interpolation are taken from prior external work (Eagle, Task Arithmetic), and the headline performance is measured on standard external MLLM benchmarks. I found no load-bearing self-citation chain, no imported uniqueness theorem, and no equation that defines the claimed output in terms of its own inputs. Observations 1-3 are empirical motivations collected from the very models being fused; they are descriptive rather than independent evidence, but they do not constitute a circular derivation. The one defensible circularity-adjacent step is the selection of α/λ using TextVQA accuracy while TextVQA is then reported as a benchmark gain, with no validation split described. That undermines the strength of the reported improvement on that benchmark and slightly inflates the 'over 4%' average. The central comparison against individual MLLMs nevertheless retains independent external content, so the paper is only partially compromised rather than circular by construction.

Assumptions & free parameters 2 free parameters · 2 assumptions · 0 invented entities

The central claim depends on one fitted scalar λ and the empirical assumption that shared-base MLLMs have compatible visual features and compatible deltas. No new physical or architectural entities are introduced.

free parameters (2)
  • merging coefficient λ = searched over {0.1, 0.3, 0.5, 0.7, 0.9, 1.0}; best on TextVQA
    Appears in Eq. (4) and controls the weight of the summed delta parameters; chosen by search on evaluation benchmarks (Appendix A.2), so the reported gains partly reflect this selection.
  • token drop count for three-model integration = 1000 tokens
    Appendix D.2: the number of randomly dropped visual tokens is chosen based on TextVQA accuracy, and affects only the three-model integration results.
assumptions (2)
  • domain assumption Linear interpolation of delta parameters (Task Arithmetic) preserves fine-tuned capabilities and can combine them into one model
    Used in Eq. (4) for the language model merge; follows [19] but extends the claim to multimodal alignment, where the merged model must interpret tokens from multiple encoders.
  • domain assumption Visual tokens from encoders of MLLMs sharing the same base LLM are feature-space compatible for direct concatenation
    Observation 2 (Figure 4b) shows t-SNE overlap, but joint usability is only validated empirically on benchmarks; the paper does not provide a formal bound or analytic justification.

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Cite this review

Pith. "Pith review of Enhancing Perception Capabilities of Multimodal LLMs with Training-Free Fusion." pith.science (2026). https://pith.science/paper/GFCA7FEC

@misc{pith2026241201289,
  author       = {Pith},
  title        = {Pith review of: Enhancing Perception Capabilities of Multimodal LLMs with Training-Free Fusion},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/GFCA7FEC}},
  note         = {Machine review of arXiv:2412.01289}
}
read the original abstract

Multimodal LLMs (MLLMs) equip language models with visual capabilities by aligning vision encoders with language models. Existing methods to enhance the visual perception of MLLMs often involve designing more powerful vision encoders, which requires exploring a vast design space and re-aligning each potential encoder with the language model, resulting in prohibitively high training costs. In this paper, we introduce VisionFuse, a novel integration framework that efficiently utilizes multiple vision encoders from off-the-shelf MLLMs to enhance visual perception without requiring additional training. Our approach is motivated by the observation that different MLLMs tend to focus on distinct regions given the same query and image. Moreover, we find that the feature distributions of vision encoders within an MLLM family, a group of MLLMs sharing the same pretrained LLM, are highly aligned. Building on these insights, VisionFuse enriches the visual context by concatenating the tokens generated by the vision encoders of selected MLLMs within a family. By merging the parameters of language models from these MLLMs, VisionFuse allows a single language model to align with various vision encoders, significantly reducing deployment overhead. We conduct comprehensive evaluations across multiple multimodal benchmarks using various MLLM combinations, demonstrating substantial improvements in multimodal tasks. Notably, when integrating MiniGemini-8B and SLIME-8B, VisionFuse achieves an average performance increase of over 4%.

Figures

Figures reproduced from arXiv: 2412.01289 by the authors.

Figure 1
Figure 1. To enhance the perception capabilities of MLLMs, ex [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Different MLLMs exhibit varying visual perception capabilities. We visualize the average cross-attention maps across all layers for two MLLMs - MGM and SLM, as well as for our method that integrates these two models, using an example to observe which areas the models focus on. It shows that our VisionFuse attention is more accurate, integrating the perceptual abilities of both MGM and SLM. Here, “MGM” represents Min… view at source ↗
Figure 3
Figure 3. Overview of VisionFuse. VisionFuse merges the language model parameters from [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figures from the paper (12 more)
Figure 4
Figure 4. Figure 4: Summary of our exploration and observations: (a) demonstrates that different MLLMs focus on distinct image regions for the [PITH_FULL_IMAGE:figures/full_fig_p004_4.png]
Figure 5
Figure 5. Figure 5: Comparision with directly dupli￾cating original tokens many times. MGM SLIME ConcatAdd global Intepolate-add 62 64 66 68 70 Accuaracy(%) on TextVQA 67.6 64.8 70.0 67.8 64.5 [PITH_FULL_IMAGE:figures/full_fig_p008_5.png]
Figure 7
Figure 7. Figure 7: Exploration of the impact of sequence length: (a) demonstrates the significant performance degradation caused by visual se [PITH_FULL_IMAGE:figures/full_fig_p013_7.png]
Figure 8
Figure 8. Figure 8: Exploration of redundancy in visual tokens: (a) and (b) examine the redundancy of visual tokens in SLIME-7B and LLaVA [PITH_FULL_IMAGE:figures/full_fig_p014_8.png]
Figure 9
Figure 9. Figure 9: Enhancement of the perception regions. What letters are on the hat? MGM G. SLM Gi. Ours SF. What's the authors initials? Ours J.L. MGM J.K. SLM G.F [PITH_FULL_IMAGE:figures/full_fig_p017_9.png]
Figure 10
Figure 10. Figure 10: Enhancement of fine-grained perception 7 [PITH_FULL_IMAGE:figures/full_fig_p017_10.png]
Figure 11
Figure 11. Figure 11: Enhancement of colors perception Please describe this image in as much detail as possible. The image captures a variety of fresh produce and food items arranged on a wooden cutting board. The produce includes tomatoes, basil, mushrooms, and broccoli, while the food it…
Figure 12
Figure 12. Figure 12: A sample for detailed descriptions. 8 [PITH_FULL_IMAGE:figures/full_fig_p018_12.png]
Figure 13
Figure 13. Figure 13: A sample for detailed descriptions. 9 [PITH_FULL_IMAGE:figures/full_fig_p019_13.png]
Figure 14
Figure 14. Figure 14: A sample for detailed descriptions. 10 [PITH_FULL_IMAGE:figures/full_fig_p020_14.png]
Figure 15
Figure 15. Figure 15: A sample for detailed descriptions. 11 [PITH_FULL_IMAGE:figures/full_fig_p021_15.png]
Figure 16
Figure 16. Figure 16: A sample for detailed descriptions. 12 [PITH_FULL_IMAGE:figures/full_fig_p022_16.png]

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Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.