REVIEW 4 major objections 4 minor 81 references
HOMIE claims that injecting pooled multimodal-language-model features directly into a video diffusion transformer's self-attention—while keeping the text encoder—improves both subject fidelity and interaction accuracy in human-object video
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · deepseek-v4-flash
2026-08-01 15:38 UTC pith:37YTYQNR
load-bearing objection Solid architecture and honest ablations, but the SOTA claim is not yet independently verifiable and the paper's own appendix contradicts its headline table. the 4 major comments →
HOMIE: Human-object Centric Video Personalization via Multimodal Intelligent Enhancement
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The central claim is that a video-personalization model can keep its text encoder, feed reference images plus a prompt to a multimodal large-language model, and inject the resulting semantic features into self-attention without a costly re-alignment phase. HOMIE does this with two additions: Global Multimodal Guidance (GMG), which pools the language-model query and key features and applies a feature-wise affine modulation to the video tokens' queries and keys; and Modality-Reference Embedding (MRE), which tags each token by its modality and by which reference entity it belongs to. The paper argues this lets the model connect an abstract logo to the object it belongs on, distinguish several s
What carries the argument
The carrying mechanism is the multimodal input stream F = [video tokens; reference tokens; MLLM tokens] fed through the DiT self-attention. GMG is the injection point: MLLM query and key features are pooled across the temporal dimension, then two lightweight projection networks produce scale and shift factors that modulate the video query and key matrices. MRE is the bookkeeping layer: learnable modality embeddings mark video, reference, and MLLM tokens so cross-modal confusion is reduced, and learnable reference embeddings assign the same vector to references that share a subject identity while using distinct vectors for different subjects. Together they let MLLM knowledge influence video g
Load-bearing premise
The headline advantage depends on a self-curated set of 200 human-object samples whose prompts and similarity judgments are produced by language models, so if those judgments favor what HOMIE was trained on, the reported gap over other methods may not generalize.
What would settle it
Run HOMIE and the strongest existing method on a public, human-object video-personalization benchmark using human-written prompts and human raters for object identity and text fidelity, with baseline models from their released code; if HOMIE's lead on object/logo fidelity and multi-view consistency narrows or disappears, the central claim is beyond what the evidence supports.
If this is right
- A single trained model covers inter-subject and intra-subject personalization, so OCR-map text fidelity and multi-view consistency do not require separate fine-tuning or 3D supervision.
- Logo personalization is handled by inside-the-model MLLM reasoning: the model can place a logo on the contextually relevant object even when the prompt does not name the relationship.
- Keeping the text encoder lets the MLLM focus on reference relationships rather than rebuilding text-to-video control, avoiding the re-alignment cost of encoder-replacement designs.
- Binding multiple references of the same subject with a shared reference embedding prevents those references from being rendered as extra objects in the video.
- Explicit modality and reference embeddings reduce cross-subject attribute mixing as the number of subjects grows.
Where Pith is reading between the lines
- If GMG works as described, the same 'keep the text encoder, modulate self-attention with pooled multimodal features' pattern is a generic interface that could bring other conditioning signals—depth, audio, camera pose—into a frozen video diffusion model.
- Because MRE assigns one learned vector per reference entity, a testable extension is to let the number of entities be dynamic; the current fixed-capacity embedding table is the first natural bottleneck to probe.
- Since the MLLM is frozen and features are extracted offline, the method can likely absorb a stronger MLLM without additional video-model training—an inexpensive upgrading path the paper does not examine.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes HOMIE, a unified framework for human-object centric video personalization (HOCVP) that handles both inter-subject references (distinct humans/objects) and intra-subject references (OCR maps, multi-view images). The method keeps the original text encoder and injects MLLM-derived features through two modules: Global Multimodal Guidance (GMG), which modulates video-token queries/keys with pooled MLLM features inside self-attention, and Modality-Reference Embedding (MRE), which separates tokens by modality and binds intra-subject references. Experiments are conducted on Wan2.1/2.2-14B, with quantitative results reported on a self-curated 200-sample benchmark. The paper claims state-of-the-art performance across HOCVP tasks, with the largest gains in OCR accuracy and multi-view consistency.
Significance. If the quantitative claims are accepted, HOMIE makes a useful architectural contribution: it shows that MLLM knowledge can be injected without replacing or re-aligning the text encoder, and it explicitly addresses intra-subject reference structures that prior methods largely ignore. The ablations in Tab. 3 and Fig. 6 support the individual contributions of GMG and MRE, and the reported training cost (11K A100 hours) is considerably lower than several baselines. However, the central 'state-of-the-art' claim rests on an unreleased, self-curated evaluation set and LLM-as-judge metrics that are not validated against standard tools. One appendix passage explicitly states that two comparison methods achieve stronger performance than HOMIE, which directly undercuts the main claim. The strengths of the method design are real, but the evidence as presented is not yet sufficient to establish the headline result.
major comments (4)
- [Appendix A.2.1] The manuscript contains an internal contradiction that is load-bearing for the central claim. After arguing that UniVideo and VINO replace the text encoder and incur higher cost, A.2.1 states that these methods 'achieve stronger performance than their Wan-14B-based counterparts, including HOMIE.' This directly contradicts the abstract and Tab. 1, where HOMIE is presented as state-of-the-art and UniVideo/VINO report lower scores. If the sentence is meant to say something else (e.g., stronger than their Wan-based counterparts but not than HOMIE), it must be corrected; as written, the paper's own appendix undermines the SOTA assertion.
- [Appendix A.2.2/A.2.3, Tab. 1] The largest reported gain, OCR accuracy (0.452 vs 0.326 for SkyReels-V3), is measured by GPT-5.2 with no validation against a standard OCR engine or human annotation. Since HOMIE is explicitly trained with OCR-map intra-subject references, the judge may reward plausible text-like rendering rather than exact string match. Eq. (12) defines normalized Levenshtein similarity, but the inputs to that formula are GPT-5.2 extractions; no evidence is given that GPT-5.2's extraction is accurate enough to support a 21.8% relative improvement claim. The evaluation set is also self-curated (200 samples) and its release is deferred to 'later,' so the central quantitative comparison is not independently reproducible.
- [Tab. 1, Tab. 7, Section 3] Baseline comparability is not established. Tab. 1 mixes closed-source Kling, Wan2.1/2.2-based open methods, and HunyuanVideo-based UniVideo/VINO with different training pipelines. The claim that HOMIE's integration strategy is 'better' than text-encoder replacement requires controlled experiments on the same backbone with comparable data and compute. The ablation 'MLLM to UmT5' (Tab. 3d) is conducted on Wan with an identical alignment network, which is informative, but it does not evaluate the full replace-the-text-encoder architecture on the same backbone. Without this control, the observed gains could be due to backbone, training recipe, or compute rather than the proposed GMG/MRE modules.
- [Section 4, Tabs. 1-3, Fig. 7] No confidence intervals, error bars, or significance tests are reported for any quantitative metric. On a 200-sample self-curated set, several differences are small in absolute terms (e.g., DINO-I 0.543 vs 0.526, Obj-Sim 0.891 vs 0.872, DINOacc 0.582 vs 0.560 in Tab. 2). The user study (40 participants, 20 samples) also reports only preference percentages without statistical testing. Given that the evaluation set is not public, the absence of uncertainty quantification makes it impossible to assess whether the reported margins are meaningful or within sampling noise.
minor comments (4)
- [Eq. (3)-(9), Sec. 3.1.3] The notation for token concatenation and the 'Proj' function in MRE is a bit underspecified. Please define the projection function precisely, e.g., how each modality index maps to slice indices, and clarify whether video tokens receive both a modality embedding and a reference embedding.
- [Appendix A.2.3] The OCR extraction prompt and the object similarity prompt are given, but no examples of GPT-5.2's outputs or failure modes are provided. Please report agreement with a conventional OCR engine (e.g., PaddleOCR or Tesseract) on the same sampled frames.
- [Tab. 3, Fig. 6] The ablation setting 'MLLM to UmT5' is described only briefly. Please state explicitly whether GMG is removed in this setting or whether the MLLM features are simply appended to the UmT5 embedding sequence while GMG remains active; the qualitative comparison in Fig. 6(a) suggests a full integration change, but the exact configuration should be unambiguous.
- [Throughout] Minor typographical and formatting issues appear, e.g., 'V AE' with odd spacing in several equations and table captions, and the inconsistent use of 'V AE tokens' vs 'VAE tokens.' These do not affect the technical content.
Circularity Check
No by-construction circularity: GMG/MRE are trained input-conditioning modules; the SOTA claim rests on evaluation validity, not on a circular derivation.
full rationale
Walking the derivation chain: the method is an input-conditioning architecture. Eq. (1) defines a flow-matching training objective against ground-truth velocity; Eqs. (2)-(9) define how reference images and MLLM hidden states are mapped into tokens and modulated inside self-attention. None of these equations defines an evaluation target (OCR accuracy, DINO-I, Obj-Sim, Face-Sim) as a function of the fitted parameters. GMG and MRE are trained network components, not post-hoc fits, and the reported numbers in Tabs. 1-3 are outputs of the trained model scored by external or semi-external metrics. No reported 'prediction' is the value of a fitted parameter renamed as a result. The self-citations in the manuscript ([5], [10], [31], [72]) are used as general related-work context for personalization, animation, and editing; they are not invoked to justify HOMIE's design, to supply a uniqueness theorem, or to forbid alternative architectures. There is also no ansatz smuggled in via a self-citation: the MLLM integration strategy and the GMG/MRE modules are introduced in the paper itself rather than imported from the authors' prior work. The strongest skeptical concern is real but is an evaluation-validity issue, not circularity: the 200-sample self-curated benchmark and the GPT-5.2-based OCR/object-similarity judge described in Appendix A.2.2-A.2.3 could be biased toward HOMIE's training distribution, and the appendices even contain the sentence that UniVideo/VINO 'achieve stronger performance than their Wan-14B-based counterparts, including HOMIE,' which undercuts the abstract's SOTA claim. Such issues bear on whether the reported metric gaps generalize, not on whether any result is equivalent to its inputs by construction. Therefore no significant circularity is present.
Axiom & Free-Parameter Ledger
free parameters (4)
- number of MRE reference embeddings =
5
- MLLM feature sequence length cap =
1024 tokens
- three-stage training schedule =
3000/2000/500 steps, LR 1e-5/1e-5/2e-6
- dataset filtering thresholds =
unspecified
axioms (5)
- domain assumption Pre-trained Wan2.1/2.2 T2V model provides stable text control and a good video prior under the flow-matching objective (Eq. 1).
- domain assumption Qwen3-VL-2B hidden states encode inter- and intra-subject relationships in a form injectable into video self-attention through a 2-layer MLP.
- domain assumption GPT-5.2-based object similarity and OCR accuracy correlate with true subject fidelity.
- domain assumption The self-curated 200-sample evaluation set is representative of HOCVP tasks.
- domain assumption Reference annotations in OpenS2V-5M and PhantomData are reliable enough for filtering HOC-relevant subjects and clips.
read the original abstract
Human-object centric video personalization (HOCVP) is a core task within subject-driven video generation. However, existing methods suffer from two key limitations. First, most approaches focusing on inter-subject personalization still struggle to strike a balance between high subject fidelity and accurate interaction patterns between humans and diverse objects, especially when objects represent abstract concepts such as logos. Second, while intra-subject references (e.g., OCR maps, multi-view inputs) are expected to enhance subject fidelity, most existing works lack mechanisms to understand such latent correspondence. To address both challenges, we propose HOMIE, an HOCVP framework that tackles both inter- and intra-subject input settings in a unified manner. Compared to previous approaches, HOMIE proposes a better MLLM integration strategy to extract knowledge of reference-level relationships without compromising the controllability of text encoders or incurring costly re-alignment. Specifically, we introduce global multimodal guidance within self-attention to better align MLLM-derived semantic features with VAE tokens. Furthermore, we propose modality-reference embedding to differentiate tokens from MLLM features and VAE tokens and associate intra-subject reference image tokens. Extensive experiments validate that our method achieves state-of-the-art performance across various HOCVP tasks. Project Page: https://yiyangcai.github.io/homie-page.github.io/
Figures
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You will receive A set of images depicting specific humans and objects and a text description detailing the target patterns of human-object interaction
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[81]
MLLM” indicates whether a multimodal large language model is incorporated into the training of video personalization to enhance generative performance. “Intra- subject Distinction
Your task: analyze the precise relationships between the visual entities in the images and the interaction logic defined in the text prompt. Specifically, evaluate how the distinct human and object features from the visual inputs should be spatially, physically, and semantically integrated to accurately reconstruct the interaction described in the text. T...
2048
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