REVIEW 3 major objections 5 minor 42 references
Progressive Multi-granular Alignments for Grounded Reasoning in Large Vision-Language Models
T0 review · 3 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash
Pith's one-line read Training a vision-language model on nested multi-granular expression pairs and decoding from simple to complex lets a 1.6B model beat larger grounded LVLMs on compositional reasoning, with gains up to 10 points.
desk verdict PromViL is a solid, useful contribution to grounded LVLM reasoning: new nested dataset, progressive decoding, and credible zero-shot gains; the main soft spots are label noise from the parser heuristic and ablations that don't isolate inference-time prompting. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing mechanism is a chain of nested multi-granular alignments. CompoVL is built by chaining Visual Genome's ⟨subject, relation, object⟩ predicates that share entities, using an LLM to render the combined predicates as a complex expression and a dependency parser to assign the bounding box of the main head noun to the whole expression; the result is a list of nested expressions at multiple complexity levels. At inference, a constituency parser extracts nested noun-phrase subsequences of the input expression, a dependency parser prunes non-referential level-one items, and the model is prompted level by level with the previous grounded response as context, using next-token prediction trained across all levels. The core objects are the nested expression lists and the progressive prompt chain, which carry the argument: ablation shows that removing intermediate levels or using only one granularity degrades accuracy.
What would settle it
Build a test set of compositional expressions whose referent is not a single head noun (coordinate noun phrases, plural sets, or expressions where the dependency parser's main entity is not the denoted region) and compare PromViL's grounding accuracy against human judgment. A sharp drop would show that the parser's head-noun box is the load-bearing crutch rather than progressive alignment.
Extended reading notes
Core claim
The central discovery is that aligning language and vision at multiple nested granularities, and using simpler grounded expressions as stepping stones for more complex ones, lets a grounded LVLM reason compositionally where holistic or object-only alignments fail. The authors claim PromViL, fine-tuned on the CompoVL dataset with 4.9% tunable parameters and 60K samples, raises its base model Kosmos-2's accuracy on CompoVL-hard from 59.12 (fine-tuned on the same data without nesting) to 64.07, and on zero-shot RefCOCOg from 60.57 to 64.44, while also improving GQA accuracy and validity. The paper attributes these gains to the chain of progressive multi-granular alignments, supported by ablations that remove intermediate levels.
Load-bearing premise
The dataset and the benchmark both assume that a dependency parser's chosen main noun is what a complex expression refers to, so any expression about a set, or any parser mistake, is paired with the wrong or ambiguous region.
Editorial extensions
If this is right
- With the same 1.6B backbone, PromViL outperforms Kosmos-2 by about 4 points on RefCOCOg and about 5.5 points on RefCOCO in zero-shot grounding, and it beats larger zero-shot models like CoVLM 2.8B and Pink 7B.
- The roughly 9-point gain on CompoVL-hard and the about 4-point gain on GQA over Kosmos-2 fine-tuned on the same data without nested structure indicate that the nested multi-granular structure, not extra VQA data, drives the improvement.
- Ablations show every complexity level is needed: removing intermediate levels drops CompoVL-hard accuracy from 64.07 to 61.22, and keeping only the simplest or only the highest level yields 53.26 or 59.12 respectively, so neither fine-grained nor coarse-grained alignment alone is sufficient.
- The performance gap over baselines widens with expression complexity and scene object count, meaning the method specifically targets harder compositional cases rather than providing a uniform boost.
- CompoVL-hard serves as a diagnostic benchmark where current grounded LVLMs drop from roughly 84% to 62% accuracy, exposing the compositional grounding failure the paper addresses.
Reading between the lines
- The same nested-data recipe could transfer to other grounded LVLMs without the parser's head-noun bias; a direct test would be to train PromViL on CompoVL with human-annotated expression-level boxes and compare the gain, isolating how much of the improvement is genuine compositional learning rather than learning the parser's heuristic.
- Because the inference chain depends on constituency and dependency parses of the query, the method's accuracy on out-of-distribution syntax (coordinate subjects, non-canonical word order, or set-denoting phrases) would probably drop; evaluating on such a probe set would reveal the parse-sensitivity of progressive decoding.
- The reported gains are measured on benchmarks that share Visual Genome's predicate vocabulary and box style, so a testable extension is to measure zero-shot grounding on datasets with different annotation conventions, such as one box per entity versus one box per entire phrase, to see whether the hierarchy transfers.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes PromViL, a method that augments grounded LVLMs with multi-granular, nested vision-language supervision and a progressive decoding procedure. It constructs CompoVL from Visual Genome predicates by chaining related triples through an LLM and assigning each generated expression to the VG bounding box of the dependency-parser-selected head noun. Training uses LoRA fine-tuning of Kosmos-2 (or MiniGPTv2) with a next-token loss over expression levels, conditioning each level on the previous level's expression and box tokens. At inference, a constituency/dependency parser recovers nested subsequences and the model is prompted level by level. The authors report gains over base and fine-tuned baselines on CompoVL-hard (about 9 points over Kosmos-2), zero-shot RefCOCO/RefCOCO+/RefCOCOg grounding, and zero-shot GQA/GQA-OOD/Visual7W, plus ablations showing that all nesting levels matter.
Significance. The central idea—hierarchical visual-language alignment plus progressive decoding—is timely and, if the concerns below are addressed, could yield a lightweight recipe (4.9% LoRA parameters, 60K fine-tuning samples, single V100). The paper includes useful controls: F-Kosmos-2 uses the same CompoVL data without nested subsequences; Kosmos-8K/16K control for the amount of VQA data; and the zero-shot RefCOCO*, GQA, and Visual7W benchmarks are not generated by the CompoVL pipeline. The Table 5 ablation clearly shows that intermediate nesting levels contribute beyond merely having the highest-level expression. These strengths make the paper potentially publishable, but the load-bearing data-labeling heuristic and several missing controls require additional work before the claims are fully established.
major comments (3)
- [Methods — Multi-granular Compositional V-L Dataset / Annotation's reliability] The sentence "The visual bounding boxes are then chosen as bounding boxes of the identified main entities in VG" is load-bearing: every CompoVL training target and every CompoVL-hard evaluation label inherits the dependency parser's head-noun choice. The manuscript does not validate that this choice agrees with the intended subject of the VG predicate chain, and the 2% human evaluation asks annotators whether the box is correct for the generated caption, not whether the parser selected the VG predicate's subject. It also reports only aggregate naturalness/uniqueness/bbox rates, with no breakdown by complexity level. Because the same parser is reused at inference to prune level-one expressions, parser errors can transfer into the prompting chain. Since CompoVL-hard is produced by the same pipeline that creates the training labels, the 8.7-point CompoVL-hard gain is not by itself evidence of compositional grounding; the external zero-shot results carry that claim. I ask for a direct parser validation (head-noun agreement with VG subject annotations, bbox agreement per complexity level, and ambiguity rates on higher-complexity items) and for an analysis of whether the widening accuracy gap in Fig. 5 survives after conditioning on label quality.
- [Experiments — Referring expression tasks (Table 2)] The supervised RefCOCO/RefCOCO+/RefCOCOg results are potentially inflated by image overlap between Visual Genome and MS COCO. RefCOCO* test images come from COCO, and CompoVL is derived from VG, which shares many images with COCO; the fine-tuned PromViL‡ has therefore plausibly seen the test images during CompoVL training. Even if the Pink and MiniGPTv2 baselines were also trained on VG region-caption data, the comparison does not separate generalization from memorization. Please quantify the overlap between the CompoVL training images and the RefCOCO* test splits, and report the supervised comparison on the non-overlapping subset (or otherwise control for overlap).
- [Methods — Training and Inference (Eq. 1, Algorithm 1); Model Analysis — Table 5] The experimental design does not isolate the inference-time progressive mechanism from the benefit of being trained on nested data. Table 5 varies the training data (all levels, intermediate removed, highest only, simplest only), but there is no condition that trains on all levels and then decodes flat, or trains without nesting and then decodes progressively. Moreover, Eq. (1) teacher-forces the previous level's ground-truth box at training time, while Algorithm 1 feeds generated boxes at inference; no analysis reports the accuracy of the intermediate generated boxes or how errors propagate. Please add the missing cross-condition (e.g., full training with single-prompt decoding, or a parser-based decomposition ablated) and report intermediate-box accuracy. It should also be stated explicitly whether F-Kosmos-2 in Table 1 uses flat or progressive decoding, since this determines what that comparison controls for.
minor comments (5)
- [General] Several references to 'Sec.' and 'Appendix' are unresolved; for example, the text says 'See Sec. ' after presenting CompoVL-hard, and the prompts and evaluation interface are said to be in the Appendix but do not appear in this version. Please include the appendix or point to the repository.
- [General] There are typographical errors: 'dependancies' in the Inference paragraph, 'thile@@uark.edu' in the author list, 'spatial tokensyi' in the Training paragraph, and 'To quantify the the relations' in Model Analysis and Ablation Studies.
- [Methods — Algorithm 1] Algorithm 1 line 8 contains 'yc ← yi', which appears to be a typo for returning the final generated sequence; please correct.
- [Experiments — Table 2] The footnote '(*) are supervised on region-caption data from VG' is ambiguous: it is unclear which rows the asterisk applies to and whether PromViL‡ was additionally trained on the RefCOCO* training splits. Please state the exact training data for each supervised row.
- [Abstract] The abstract's 'nearly 5 point and 10 point increases in accuracy and validity' should be calibrated to Table 3: the accuracy gap is 45.07 versus 40.55 (4.52 points) and the validity gap is 83.47 versus 74.82 (8.65 points).
Circularity Check
No significant circularity: the central grounding gains are confirmed on independent human-annotated benchmarks, while CompoVL-hard is an in-house benchmark that is human-validated but not used as a derivation.
full rationale
The paper's central claim is that hierarchical multi-granular V-L training plus progressive decoding improves grounded compositional reasoning. That claim is not circular: the method is evaluated on RefCOCO/RefCOCO+/RefCOCOg, GQA, GQA-OOD, and Visual7W, whose labels are human-annotated and independent of the CompoVL construction pipeline. The gains on those external benchmarks provide independent evidence that the approach transfers beyond the generated dataset. The only in-house evaluation is CompoVL-hard, whose labels are created by the same pipeline (VG predicates, LLM-generated text, dependency-parser main-entity boxes) used for training; this makes CompoVL-hard an in-domain benchmark, but the paper does not derive any prediction from the pipeline, and it reports a 92.48% human-validated bounding-box accuracy on a 2% sample. There is no fitted parameter later renamed as a prediction, no load-bearing self-citation, no imported uniqueness theorem, and no ansatz smuggled in through citation. The dependency-parser head-noun heuristic is a data-validity caveat for CompoVL-hard, not a circular step: at inference the model must predict the bounding box from the image rather than receiving the parser's chosen box, and the external benchmarks do not share the generation rule. Overall, the derivation chain is self-contained and the main empirical claims are supported by independent evaluations.
Assumptions & free parameters
assumptions (4)
- domain assumption The head noun selected by the dependency parser identifies the visual target of a complex referring expression.
- domain assumption Visual Genome object annotations and predicate triples are complete enough to cover all entities mentioned in LLM-generated descriptions.
- domain assumption Constituency parsing at inference yields nested noun-phrase subsequences that mirror CompoVL's construction.
- domain assumption The LLM used for data generation strictly follows the provided VG predicates without inventing new objects or relations.
Cite this review
Pith. "Pith review of Progressive Multi-granular Alignments for Grounded Reasoning in Large Vision-Language Models." pith.science (2026). https://pith.science/paper/FWZSGL5Z
@misc{pith2026241208125,
author = {Pith},
title = {Pith review of: Progressive Multi-granular Alignments for Grounded Reasoning in Large Vision-Language Models},
year = {2026},
howpublished = {\url{https://pith.science/paper/FWZSGL5Z}},
note = {Machine review of arXiv:2412.08125}
}
read the original abstract
Existing Large Vision-Language Models (LVLMs) excel at matching concepts across multi-modal inputs but struggle with compositional concepts and high-level relationships between entities. This paper introduces Progressive multi-granular Vision-Language alignments (PromViL), a novel framework to enhance LVLMs' ability in performing grounded compositional visual reasoning tasks. Our approach constructs a hierarchical structure of multi-modal alignments, ranging from simple to complex concepts. By progressively aligning textual descriptions with corresponding visual regions, our model learns to leverage contextual information from lower levels to inform higher-level reasoning. To facilitate this learning process, we introduce a data generation process that creates a novel dataset derived from Visual Genome, providing a wide range of nested compositional vision-language pairs. Experimental results demonstrate that our PromViL framework significantly outperforms baselines on various visual grounding and compositional question answering tasks. The code is available at: https://github.com/lqh52/PromViL.
Figures
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Works this paper leans on
-
[1]
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-
[3]
Alayrac, J.-B.; Donahue, J.; Luc, P.; Miech, A.; Barr, I.; Hasson, Y.; Lenc, K.; Mensch, A.; Millican, K.; Reynolds, M.; et al. 2022. Flamingo: a visual language model for few-shot learning. Advances in neural information processing systems
work page 2022
-
[4]
Bai, J.; Bai, S.; Yang, S.; Wang, S.; Tan, S.; Wang, P.; Lin, J.; Zhou, C.; and Zhou, J. 2023. Qwen-vl: A frontier large vision-language model with versatile abilities. arXiv preprint arXiv:2308.12966
arXiv 2023
-
[5]
Bottou, L. 2014. From machine learning to machine reasoning: An essay. Machine learning
work page 2014
-
[6]
Chen, G.; Shen, L.; Shao, R.; Deng, X.; and Nie, L. 2024. Lion: Empowering multimodal large language model with dual-level visual knowledge. In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition
work page 2024
-
[7]
Chen, J.; Zhu, D.; Shen, X.; Li, X.; Liu, Z.; Zhang, P.; Krishnamoorthi, R.; Chandra, V.; Xiong, Y.; and Elhoseiny, M. 2023. Minigpt-v2: large language model as a unified interface for vision-language multi-task learning. arXiv preprint arXiv:2310.09478
arXiv 2023
-
[8]
Cohen, J. 1960. A coefficient of agreement for nominal scales. Educational and psychological measurement
work page 1960
Show all 42 references
-
[9]
Cresswell, M. J. 2016. Logics and languages. Routledge
2016
-
[10]
H.; Le, T
Dang, L. H.; Le, T. M.; Le, V.; and Tran, T. 2021. Hierarchical object-oriented spatio-temporal reasoning for video question answering. arXiv preprint arXiv:2106.13432
2021 arXiv
-
[11]
Gao, Y.; Liu, J.; Xu, Z.; Zhang, J.; Li, K.; Ji, R.; and Shen, C. 2022. Pyramidclip: Hierarchical feature alignment for vision-language model pretraining. Advances in neural information processing systems
2022
-
[12]
Hallgren, K. A. 2012. Computing inter-rater reliability for observational data: an overview and tutorial. Tutorials in quantitative methods for psychology
2012
-
[13]
Honnibal, M.; Montani, I.; Van Landeghem, S.; and Boyd, A. 2020. spaCy: Industrial-strength Natural Language Processing in Python
2020
-
[14]
J.; Shen, Y.; Wallis, P.; Allen-Zhu, Z.; Li, Y.; Wang, S.; Wang, L.; and Chen, W
Hu, E. J.; Shen, Y.; Wallis, P.; Allen-Zhu, Z.; Li, Y.; Wang, S.; Wang, L.; and Chen, W. 2021. Lora: Low-rank adaptation of large language models. arXiv preprint arXiv:2106.09685
2021 arXiv
-
[15]
K.; Patra, B.; et al
Huang, S.; Dong, L.; Wang, W.; Hao, Y.; Singhal, S.; Ma, S.; Lv, T.; Cui, L.; Mohammed, O. K.; Patra, B.; et al. 2024. Language is not all you need: Aligning perception with language models. Advances in Neural Information Processing Systems, 36
2024
-
[16]
A.; and Manning, C
Hudson, D. A.; and Manning, C. D. 2019. Gqa: A new dataset for real-world visual reasoning and compositional question answering. In Proceedings of the IEEE/CVF conference on computer vision and pattern recognition
2019
-
[17]
Hupkes, D.; Dankers, V.; Mul, M.; and Bruni, E. 2020. Compositionality decomposed: How do neural networks generalise? Journal of Artificial Intelligence Research
2020
-
[18]
M.; and Partee, B
Janssen, T. M.; and Partee, B. H. 1997. Compositionality. In Handbook of logic and language. Elsevier
1997
-
[19]
Q.; Sablayrolles, A.; Roux, A.; Mensch, A.; Savary, B.; Bamford, C.; Chaplot, D
Jiang, A. Q.; Sablayrolles, A.; Roux, A.; Mensch, A.; Savary, B.; Bamford, C.; Chaplot, D. S.; Casas, D. d. l.; Hanna, E. B.; Bressand, F.; et al. 2024. Mixtral of experts. arXiv preprint arXiv:2401.04088
2024 arXiv
-
[20]
Kazemzadeh, S.; Ordonez, V.; Matten, M.; and Berg, T. 2014. Referitgame: Referring to objects in photographs of natural scenes. In Proceedings of the 2014 conference on empirical methods in natural language processing (EMNLP)
2014
-
[21]
Kervadec, C.; Antipov, G.; Baccouche, M.; and Wolf, C. 2021. Roses are red, violets are blue... but should vqa expect them to? In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition
2021
-
[22]
Kitaev, N.; Cao, S.; and Klein, D. 2019. Multilingual Constituency Parsing with Self-Attention and Pre-Training. In Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics
2019
-
[23]
A.; et al
Krishna, R.; Zhu, Y.; Groth, O.; Johnson, J.; Hata, K.; Kravitz, J.; Chen, S.; Kalantidis, Y.; Li, L.-J.; Shamma, D. A.; et al. 2017. Visual genome: Connecting language and vision using crowdsourced dense image annotations. International journal of computer vision
2017
-
[24]
M.; Le, V.; Venkatesh, S.; and Tran, T
Le, T. M.; Le, V.; Venkatesh, S.; and Tran, T. 2020. Hierarchical conditional relation networks for video question answering. In Proceedings of the IEEE/CVF conference on computer vision and pattern recognition
2020
-
[25]
Li, J.; Chen, D.; Hong, Y.; Chen, Z.; Chen, P.; Shen, Y.; and Gan, C. 2023 a . Covlm: Composing visual entities and relationships in large language models via communicative decoding. arXiv preprint arXiv:2311.03354
2023 arXiv
-
[26]
Li, J.; Li, D.; Savarese, S.; and Hoi, S. 2023 b . Blip-2: Bootstrapping language-image pre-training with frozen image encoders and large language models. International conference on machine learning
2023
-
[27]
Liu, F.; Emerson, G.; and Collier, N. 2023. Visual spatial reasoning. In Transactions of the Association for Computational Linguistics
2023
-
[28]
Liu, H.; Li, C.; Wu, Q.; and Lee, Y. J. 2024. Visual instruction tuning. Advances in neural information processing systems
2024
-
[29]
Liu, S.; Zeng, Z.; Ren, T.; Li, F.; Zhang, H.; Yang, J.; Li, C.; Yang, J.; Su, H.; Zhu, J.; et al. 2023. Grounding dino: Marrying dino with grounded pre-training for open-set object detection. arXiv preprint arXiv:2303.05499
2023 arXiv
-
[30]
O.; Gandhi, M.; Gao, I.; and Krishna, R
Ma, Z.; Hong, J.; Gul, M. O.; Gandhi, M.; Gao, I.; and Krishna, R. 2023. Crepe: Can vision-language foundation models reason compositionally? In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition
2023
-
[31]
L.; and Murphy, K
Mao, J.; Huang, J.; Toshev, A.; Camburu, O.; Yuille, A. L.; and Murphy, K. 2016. Generation and comprehension of unambiguous object descriptions. In Proceedings of the IEEE conference on computer vision and pattern recognition
2016
-
[32]
Nivre, J. 2008. Algorithms for Deterministic Incremental Dependency Parsing. Computational Linguistics
2008
-
[33]
Peng, Z.; Wang, W.; Dong, L.; Hao, Y.; Huang, S.; Ma, S.; Ye, Q.; and Wei, F. 2024. Grounding multimodal large language models to the world. In The Twelfth International Conference on Learning Representations
2024
-
[34]
A.; Wang, L.; Cervantes, C
Plummer, B. A.; Wang, L.; Cervantes, C. M.; Caicedo, J. C.; Hockenmaier, J.; and Lazebnik, S. 2015. Flickr30k entities: Collecting region-to-phrase correspondences for richer image-to-sentence models. In Proceedings of the IEEE international conference on computer vision
2015
-
[35]
Shao, S.; Li, Z.; Zhang, T.; Peng, C.; Yu, G.; Zhang, X.; Li, J.; and Sun, J. 2019. Objects365: A large-scale, high-quality dataset for object detection. In Proceedings of the IEEE/CVF international conference on computer vision
2019
-
[36]
Wang, P.; Yang, A.; Men, R.; Lin, J.; Bai, S.; Li, Z.; Ma, J.; Zhou, C.; Zhou, J.; and Yang, H. 2022. Ofa: Unifying architectures, tasks, and modalities through a simple sequence-to-sequence learning framework. In International conference on machine learning
2022
-
[37]
Xuan, S.; Guo, Q.; Yang, M.; and Zhang, S. 2024. Pink: Unveiling the power of referential comprehension for multi-modal llms. In Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition
2024
-
[38]
C.; and Berg, T
Yu, L.; Poirson, P.; Yang, S.; Berg, A. C.; and Berg, T. L. 2016. Modeling context in referring expressions. In Computer Vision--ECCV 2016: 14th European Conference, Amsterdam, The Netherlands, October 11-14, 2016, Proceedings, Part II 14
2016
-
[39]
Yuksekgonul, M.; Bianchi, F.; Kalluri, P.; Jurafsky, D.; and Zou, J. 2023. When and why vision-language models behave like bags-of-words, and what to do about it? In The Eleventh International Conference on Learning Representations
2023
-
[40]
Zeng, Y.; Zhang, X.; and Li, H. 2021. Multi-grained vision language pre-training: Aligning texts with visual concepts. arXiv preprint arXiv:2111.08276
2021 arXiv
-
[41]
Zhao, T.; Zhang, T.; Zhu, M.; Shen, H.; Lee, K.; Lu, X.; and Yin, J. 2022. Vl-checklist: Evaluating pre-trained vision-language models with objects, attributes and relations. arXiv preprint arXiv:2207.00221
2022 arXiv
-
[42]
Zhu, Y.; Groth, O.; Bernstein, M.; and Fei-Fei, L. 2016. Visual7w: Grounded question answering in images. In Proceedings of the IEEE conference on computer vision and pattern recognition
2016
Reviewed August 11, 2026 · model on record in the stance chip above.
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