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REVIEW 4 major objections 6 minor 105 references

SAILViT: Towards Robust and Generalizable Visual Backbones for MLLMs via Gradual Feature Refinement

T0 review · 4 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read This paper proposes that a vision backbone trained through three stages of progressive unfreezing—connector, then ViT, then full model—can consistently improve lightweight multimodal LLMs across different LLM families and scales.

desk verdict A useful empirical recipe paper with released checkpoints, but the headline gain is confounded by 36.5M extra training samples and LLM co-training the baselines never got—worth refereeing, not accepting as-is. read the letter →

arxiv 2507.01643 v1 pith:ERDUQ2TT submitted 2025-07-02 cs.CV

classification cs.CV
keywords visiontransformermultimodallargelanguagemodelvisualbackbonegradualfeaturerefinementconnectorwarm-upworldknowledgeinfusionprogressiveunfreezingbenchmark
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 asks why lightweight multimodal models plateau: a pretrained ViT's features and the LLM's token space are misaligned, and standard end-to-end co-training destabilizes optimization. It proposes SAILViT, a visual backbone trained with a three-stage gradual feature refinement schedule—warm up an MLP connector on captions and OCR, then co-train the ViT and connector, then unlock all parameters on 36.5M mixed world-knowledge samples. The claim is that this yields features that are both finely aligned to the LLM and rich in world knowledge, and that plugging SAILViT into existing lightweight MLLMs raises their average performance on OpenCompass and a 19-dataset OpenSource benchmark across InternLM2.5, Qwen2.5, and Qwen3 at various scales. If true, it offers a recipe for swapping in a better visual backbone rather than retraining a whole multimodal model.

What carries the argument

The load-bearing mechanism is graduated parameter unfreezing, executed in three stages under the standard autoregressive next-token objective restricted to text tokens: stage one trains only a randomly initialized MLP connector while ViT and LLM stay frozen, giving coarse modality alignment; stage two unlocks the ViT and connector and adds image caption, OCR, and video caption data for fine-grained alignment; stage three unlocks all parameters, including the LLM, and trains on a 36.5M mixture of captions, OCR, open QA, math, short QA, and text. A 2-layer MLP is the connector, images enter at 448×448 resolution with tiling, and pixel shuffle compresses visual tokens to 256.

What would settle it

Train SAILViT and equally sized AIMv2/InternViT backbones inside a mainstream open multimodal training pipeline that already includes a progressive ViT-alignment stage and a much larger encoder, using identical data and compute, and compare on OpenCompass; if SAILViT's advantage shrinks to parity or reverses, the generality claim fails.

Watch

Extended reading notes

Core claim

The central discovery the authors report is that the gap between a visual backbone and a paired LLM is not fixed: a schedule that trains only the connector first, then the ViT plus connector, then the full model transforms a standard AIMv2 ViT checkpoint into a backbone that improves downstream MLLMs. In their comparisons, SAILViT-Large (300M parameters) beats same-scale AIMv2-Large and InternViT-300M-v2.5 and often beats the larger AIMv2-Huge baseline, for instance on average OpenCompass with Qwen2.5-1.5B, while SAILViT-Huge pushes scores higher and shows large gains on hallucination-heavy tasks such as HallusionBench. They further report that the schedule transfers to a different ViT (InternViT-300M-v2.5), holds under both their default two-stage evaluation and a LLaVA-1.5-style evaluation, and follows scaling-law improvements as the world-knowledge stage grows from 2M to 36.5M samples.

Load-bearing premise

The load-bearing premise is that the paper's own training-and-evaluation recipe, based on roughly 8M alignment samples, 3M question-answer samples, and a 36.5M world-knowledge stage, is representative enough of how leading multimodal models are trained today that a backbone's advantage under this recipe will carry over; the paper itself notes that real pipelines are often more complex and more backbone-friendly.

Editorial extensions

If this is right

  • Swapping SAILViT-Large into a Qwen2.5-1.5B-based MLLM raises average OpenCompass from 54.6 to 56.9 with no change to the connector or training recipe.
  • Under a LLaVA-1.5-style evaluation where the ViT stays frozen during SFT, SAILViT-Large still beats AIMv2-Large and InternViT-300M-v2.5 on both OpenCompass and OpenSource.
  • The three-stage recipe transfers to a different backbone: SAILViT-InternViT outperforms the original InternViT-300M-v2.5 under two different evaluation regimes.
  • Scaling the world-knowledge infusion data from 2M to 36.5M samples improves both benchmark averages and ImageNet-family recognition accuracy, indicating headroom for larger data.
  • SAILViT-Large at 300M parameters often outperforms AIMv2-Huge at 600M, suggesting the training schedule can partially compensate for parameter scale.

Reading between the lines

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

  • The staged schedule may function mainly as a stabilizer and curriculum: a direct comparison against single-stage full fine-tuning with an extended learning-rate warm-up, holding data constant, would isolate whether the staging itself or simply more optimization drives the gains.
  • Because the paper only tests a 2-layer MLP connector, a natural extension is to test whether the benefit persists with a Q-Former or a single linear layer; if it does, the mechanism is likely about gradual ViT adaptation rather than connector capacity.
  • The stage-three mixture mixes open QA, math, and plain text with visual data, so ablating the text/math fraction while holding visual data fixed would separate world-knowledge infusion from visual feature refinement.
  • The observed transfer across LLM families suggests the features are not tightly coupled to the training LLM; a stronger test would insert SAILViT into a model using a different connector and training objective without any alignment stage.
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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

4 major / 6 minor

Summary. The paper proposes SAILViT, a three-stage gradual feature refinement training recipe for vision transformers used as backbones in multimodal large language models (MLLMs). Stage 1 trains only the MLP connector on 8M caption/OCR data with ViT and LLM frozen; Stage 2 trains the ViT and connector jointly on an expanded caption/OCR/video corpus; Stage 3 performs full-parameter training of ViT, connector, and LLM on a 36.5M mixed world-knowledge corpus (Table 1). Starting from AIMv2-Large/Huge or InternViT-300M-v2.5, the authors report consistent average gains over the unmodified backbones on the OpenCompass and OpenSource benchmarks when paired with several LLM families and scales (Tables 2, 3), plus transfer results on ImageNet classification (Table 7) and ablations of trainable parameters, LLM scale, SFT strategy, data scaling, and data composition (Tables 4–6, Figures 3–6). The models are released on Hugging Face.

Significance. If the protocol were clean, the contribution would be practically valuable: a simple, transferable training schedule that converts existing open ViTs into stronger backbones for lightweight MLLMs, with model weights released. The paper also contains a broad empirical sweep (multiple LLM families, multiple scales, classification transfer, scaling-law analyses) and the core idea of coarse-to-fine feature refinement is well motivated. However, the headline comparison is confounded by unequal training data and compute: SAILViT receives the full three-stage recipe with 36.5M stage-3 samples and LLM co-training, while the AIMv2/InternViT baselines are evaluated only after the two-stage 8M-pretrain + 3M-SFT regime. Figure 3 shows that the stage-3 data volume alone produces gains of the same magnitude as the reported improvement over AIMv2, so the central claim of the paper is not supported by the current evidence. The paper also selects the 'Best' data composition in Figure 6 on the same benchmarks used for the headline results and trains on DocVQA while evaluating on DocVQA(val). These issues are fixable with additional control experiments, but they are load-bearing.

major comments (4)
  1. [§4.2–4.3, Tables 2–3, Figure 3] The central comparison is not controlled. SAILViT is produced by taking AIMv2 or InternViT and running the three-stage recipe whose third stage alone adds 36.5M samples with ViT, connector, and LLM trainable, while the baselines are the original checkpoints evaluated only in the two-stage 8M-pretrain + 3M-SFT regime. Figure 3 shows that increasing stage-3 data from 2M to 36.5M moves SAILViT-Large from 0.555 to 0.569 on OpenCompass, which is the same magnitude as the 54.6-to-56.9 gap over AIMv2-Large reported in Table 2. To support the claim that the gradual three-stage schedule is responsible for the improvements, the authors should report equal-data controls: for example, AIMv2-Large/Huge trained on the same 36.5M mixture in a single stage, and AIMv2 trained with the same three-stage schedule with the same total data and compute.
  2. [§4.6, Table 4] The ablation in Table 4 does not isolate the gradual schedule. The 'Baseline' column corresponds to AIMv2-Large without any world-knowledge training, while all 'Setting' columns include the 36.5M world-knowledge infusion. In particular, Setting 1 (freeze LLM, train ViT+adapter) already raises OpenCompass from 54.60 to 55.30 and OpenSource from 60.10 to 62.45, showing that most of the gain over baseline comes from training on the 36.5M mixture rather than from LLM co-training or from the specific AIO strategy. Without an AIMv2 control trained on the same mixture, the table cannot attribute the gain to gradual feature refinement.
  3. [Appendix F, Figure 6; Tables 1 and 10] The 'Best' data-composition configuration in Figure 6 is selected by evaluating on OpenCompass and OpenSource, the same benchmarks used for the headline results in Tables 2 and 3. This selection creates a bias in the reported headline numbers. In addition, Table 1 lists DocVQA among the stage-3 training data, and Table 10 evaluates on DocVQA(val) as part of the OpenSource average; training on DocVQA and then reporting DocVQA(val) invalidates that dataset's contribution. The authors should either remove DocVQA from training, evaluate on a non-overlapping split, or provide a contamination analysis.
  4. [§6 Limitations; Appendix A, Table 9] The authors' own Limitations section concedes that mainstream MLLM training strategies are often more complex and 'visual backbone-friendly' and that whether SAILViT retains its advantage under such strategies and larger ViTs 'requires further investigation.' Appendix A attempts to address this by inserting a ViT-friendly stage into the baselines, but Table 9 shows only modest gains for the baselines (e.g., AIMv2-Large 54.6 to 55.1) and does not give the baselines the 36.5M world-knowledge mixture; the unequal-data confound therefore remains. The abstract's claim of 'significant and consistent performance improvements' should be tempered until equal-data controls are provided.
minor comments (6)
  1. [Table 2] The heading contains the typo 'SAILViT-Lagre', and the text inconsistently uses 'InterLM2.5' and 'InternLM2.5' across tables and prose.
  2. [Table 1, §3.3] The stage-3 data amounts in Table 1 sum to 36.0M (3.1+9.6+7.1+4.8+1.5+0.9+9.0), not the stated 36.5M; please reconcile the numbers.
  3. [§4.3] The phrase 'relative improvements of 2.3%, 5.5%, and 5.4%' appears to refer to absolute percentage-point differences in average scores; please clarify whether these are relative or absolute changes.
  4. [Table 8, Figure 4] The column header 'proaio2m' is unclear; it likely means 'Progressive AIO, 2M' but should be spelled out in the caption.
  5. [§4.1] The evaluation uses a 'customized version of the VLMEvalKit'; the customizations should be described or released to ensure reproducibility.
  6. [Equation (1)] The loss sum starts at i=2 without explaining why x0 and x1 are excluded; either define the indexing convention or correct the range.

Circularity Check

2 steps flagged · score 5.0 of 10

Partial circularity: the final data recipe is selected on the same benchmarks used for headline claims, and stage-3 training data overlaps the OpenSource evaluation suite; the core gradual-refinement claim retains independent support.

  1. fitted input called prediction [Appendix F (Data Composition Ablation, Figure 6), with the selected 'Best' mixture used by Section 4.6 Table 4 and the final SAILViT reported in Tables 2 and 3.]
    "The experiment corresponding to "Best" is the data ratio we actually adopted, which corresponds to the data ratio in Table 1 of the main paper. We respectively integrate the ViTs trained under these different data ratios into Qwen2.5-1.5B and evaluate them within the same ablation regimes. As shown in Figure 6, excessively increasing the concentration ratio of any type of data will affect the performance of ViTs."

    The 'Best' data ratio is chosen by ranking variants on the OpenCompass/OpenSource benchmarks, and the released SAILViT plus the Table 4 'Best Setting' use that selected ratio. Tables 2 and 3 then present scores on the same OpenCompass/OpenSource benchmarks as evidence that the method works. The chosen composition is therefore a hyperparameter fitted to the target metric, so the reported benchmark numbers cannot independently confirm the data-ratio choice; the superiority of 'Best' over the other ratios is an artifact of the selection procedure, not a prediction.

  2. other [Table 1 (World Knowledge Infusion OCR row) vs Section 4.2 Benchmark and Table 10 (OpenSource results).]
    "OCR Docmatix [48], DocVQA [70], DocStruct [90], Molmo 9.6M ... These rich datasets include ChartQA [68], DocVQA [68], InfoVQA [69], TextQA [79], LLaVABench [56], MME [34], OCRVQA [71], POPE [55], RealWorldQA [18], SEEDBench [52], and ScienceQA [64]."

    The stage-3 world-knowledge training mixture explicitly includes DocVQA, and the OpenSource benchmark used to report headline gains also includes DocVQA. A model trained on DocVQA-style document QA is then evaluated on DocVQA, so part of the reported OpenSource improvement may reflect overlap between the training and evaluation distributions rather than a general visual-backbone property. This makes the OpenSource 'prediction' partly an artifact of the training/evaluation overlap instead of an independent confirmation.

full rationale

This is an empirical recipe paper rather than a formal derivation, so most circularity patterns (self-definitional equations, imported uniqueness theorems, ansatz-smuggling citations) do not apply. The main circular elements are evaluative: the 'Best' data composition in Appendix F is selected by scoring variants on the same OpenCompass/OpenSource benchmarks that later appear as headline results, and Table 10's OpenSource evidence is partly compromised by direct training/evaluation overlap on DocVQA. These issues mean some reported gains are partly forced by the selection and data-choice procedure rather than independently predicted. However, the central gradual-refinement claim is not fully circular: ImageNet classification results in Table 7 are independent of the MLLM benchmark, the OpenCompass gains over the untouched AIMv2/InternViT baselines are not guaranteed by construction, and Appendix A shows that adding a ViT-friendly stage also helps the baselines. The self-citation to SAIL-Caption is a data-source citation, not a load-bearing proof, and the confounding of stage-3 data and compute with the three-stage schedule is an attribution problem rather than definitional circularity. On balance, the paper has partial circularity in its evaluation protocol but retains independent empirical content, so a moderate score is appropriate.

Assumptions & free parameters 5 free parameters · 5 assumptions · 0 invented entities

The claim rests on training hyperparameters and data choices rather than a derivation. Stage learning rates, batch sizes, resolution, tiling cap, and the 'Best' data composition are hand-selected via ablations on the same benchmarks used for final reporting. The evaluation-regime and non-overlap assumptions are load-bearing because the headline comparisons do not give baselines the same data budget and no contamination check is provided. No new architectural entity, loss, or scientific object is introduced.

free parameters (5)
  • Stage-wise learning rates = 2e-4, 2e-5, 1e-5
    Chosen by hand for the three stages in Sections 3.1-3.3; no learning-rate sensitivity study is reported, and the central results depend on these values.
  • Stage-wise batch sizes = 1920, 512, 512
    Set per stage in Sections 3.1-3.3; no ablation is provided.
  • World knowledge data composition ('Best') = Caption/OCR/OpenQA/Text/Math/ShortQA mix in Table 1
    The 'Best' ratio in Figure 6 was selected by evaluating on OpenCompass and OpenSource, the same benchmarks used for headline claims.
  • Input resolution and tiling cap = 448x448, max 8 sub-images, 256 tokens after pixel shuffle
    Fixed in Section 4.1; resolution and tiling are not ablated.
  • Stage data volumes and schedule = 8M / ~11M / 36.5M
    The number of stages and per-stage data size are design choices; scaling results in Figure 3 show non-monotonic gains, indicating data volume is a strong driver.
assumptions (5)
  • domain assumption Autoregressive next-token loss over text tokens (Eq. 1) is a sufficient objective for aligning visual features with LLMs in all three stages.
    The entire pipeline uses this single loss; no alternative alignment losses or contrastive objectives are tested (Section 3).
  • domain assumption The custom evaluation regime ('8M Pretrain + 3M SFT' or its three-stage variant with Qwen2.5-1.5B) is representative of how mainstream MLLMs use visual backbones.
    The Limitations in Section 6 concede that 'the training strategies of mainstream MLLMs are often more complex and visual backbone-friendly'; robustness claims rest on this regime.
  • domain assumption The 36.5M world-knowledge training mixture does not materially overlap with the OpenCompass/OpenSource evaluation sets.
    No decontamination analysis is reported, while the mixture includes broad public corpora (Cauldron, Cambrian, LLaVA-OneVision, ShareGPT4V, Infinity-MM) commonly used with these benchmarks (Table 1).
  • domain assumption AIMv2 pretrained weights are a valid starting point, and additional SAILViT training is comparable to the AIMv2 baseline despite extra data and compute.
    Every SAILViT model initializes from AIMv2; baselines receive none of the extra 36.5M training, so the comparison conflates recipe and data budget (Sections 4.1-4.3).
  • domain assumption Choosing the stage-3 data proportions by scores on the reporting benchmarks does not materially inflate the reported gains.
    The 'Best' composition in Figure 6 is selected using OpenCompass/OpenSource evaluations, which are also the headline benchmarks (Section 4.6, Appendix F).

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Cite this review

Pith. "Pith review of SAILViT: Towards Robust and Generalizable Visual Backbones for MLLMs via Gradual Feature Refinement." pith.science (2026). https://pith.science/paper/ERDUQ2TT

@misc{pith2026250701643,
  author       = {Pith},
  title        = {Pith review of: SAILViT: Towards Robust and Generalizable Visual Backbones for MLLMs via Gradual Feature Refinement},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/ERDUQ2TT}},
  note         = {Machine review of arXiv:2507.01643}
}
read the original abstract

Vision Transformers (ViTs) are essential as foundation backbones in establishing the visual comprehension capabilities of Multimodal Large Language Models (MLLMs). Although most ViTs achieve impressive performance through image-text pair-based contrastive learning or self-supervised mechanisms, they struggle to engage in connector-based co-training directly with LLMs due to potential parameter initialization conflicts and modality semantic gaps. To address the above challenges, this paper proposes SAILViT, a gradual feature learning-enhanced ViT for facilitating MLLMs to break through performance bottlenecks in complex multimodal interactions. SAILViT achieves coarse-to-fine-grained feature alignment and world knowledge infusion with gradual feature refinement, which better serves target training demands. We perform thorough empirical analyses to confirm the powerful robustness and generalizability of SAILViT across different dimensions, including parameter sizes, model architectures, training strategies, and data scales. Equipped with SAILViT, existing MLLMs show significant and consistent performance improvements on the OpenCompass benchmark across extensive downstream tasks. SAILViT series models are released at https://huggingface.co/BytedanceDouyinContent.

Figures

Figures reproduced from arXiv: 2507.01643 by the authors.

Figure 1
Figure 1. Comparison results of Qwen2.5-1.5B [96] paired with different visual backbones across diverse tasks on the popular OpenCompass benchmark. Our SAILViT series is superior to AIMv2 [33] and InternViT [16] by large margins. it is difficult to ensure parameter alignment and consistent enhance￾ment with LLMs for objective opti￾mization [33]. Furthermore, existing efforts in pre-training procedures usu￾ally focus on constr… view at source ↗
Figure 2
Figure 2. Illustration of the training pipeline for SAILViT by gradual feature refinement. (a) In the [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Illustration of the scaling law phenomenon analysis. The overall performances of MLLMs [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: Scaling trend of average gains for SAILViT-Large/Huge. [PITH_FULL_IMAGE:figures/full_fig_p010_4.png]
Figure 5
Figure 5. Figure 5: Illustration of the scaling law phenomenon analysis. The overall performances of MLLMs [PITH_FULL_IMAGE:figures/full_fig_p020_5.png]
Figure 6
Figure 6. Figure 6: Ablation of data proportions in the world knowledge infusion stage. The total quantity of [PITH_FULL_IMAGE:figures/full_fig_p021_6.png]

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Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.