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arxiv: 2604.02908 · v2 · submitted 2026-04-03 · 💻 cs.CV · cs.HC· cs.MM

Recognition: no theorem link

SentiAvatar: Towards Expressive and Interactive Digital Humans

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Pith reviewed 2026-05-13 20:11 UTC · model grok-4.3

classification 💻 cs.CV cs.HCcs.MM
keywords SentiAvatardigital humansspeech-driven animation3D motion generationreal-time avatarmultimodal dialogue datasetmotion foundation modelprosody synchronization
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The pith

SentiAvatar generates real-time 3D digital humans that speak, gesture, and emote by decoupling semantic planning from prosody interpolation.

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

The paper builds a complete pipeline for interactive digital humans that must solve data scarcity, semantic motion mapping, and frame-level audio synchronization at once. It releases SuSuInterActs, a 37-hour mocap dialogue corpus with speech, full-body motion, and facial expressions captured around one character. A motion foundation model is pre-trained on over 200,000 sequences to supply broad action priors, then an audio-aware plan-then-infill network separates sentence-level intent planning from frame-level rhythm interpolation. The resulting system produces six seconds of output in 0.3 seconds, supports unlimited multi-turn streaming, and records large gains on both the new dataset and BEATv2.

Core claim

SentiAvatar is an end-to-end framework that first assembles SuSuInterActs, a 21K-clip dialogue corpus, pre-trains a Motion Foundation Model on 200K+ motion sequences, and then applies an audio-aware plan-then-infill architecture. Sentence-level semantic planning selects appropriate gestures and expressions while frame-level prosody interpolation aligns motion timing and dynamics to the incoming speech waveform, yielding motions that are both contextually appropriate and rhythmically natural.

What carries the argument

The audio-aware plan-then-infill architecture that decouples sentence-level semantic planning from frame-level prosody-driven interpolation.

If this is right

  • The system reaches R@1 of 43.64 percent on SuSuInterActs, nearly twice the best reported baseline.
  • It records FGD of 4.941 and BC of 8.078 on BEATv2 while generating six seconds of motion in 0.3 seconds.
  • Unlimited multi-turn streaming becomes feasible because the architecture separates long-horizon planning from local interpolation.
  • The same pre-trained motion priors can be reused for non-conversational actions beyond the dialogue domain.
  • The released dataset and model weights enable direct replication and extension by other researchers.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Similar plan-then-infill separation may improve other conditional motion tasks such as music-driven dance or sign-language synthesis.
  • The 37-hour single-character corpus could serve as a seed for few-shot personalization of new avatars.
  • Real-time performance opens direct integration into live virtual agents or game engines without offline rendering.

Load-bearing premise

The pre-trained motion foundation model supplies useful priors for conversational gestures and the decoupled planning-infill step produces coherent motions without introducing artifacts or losing naturalness.

What would settle it

A side-by-side evaluation in which human raters consistently judge SentiAvatar motions as less natural or less speech-synchronized than the best baseline on held-out multi-turn dialogues.

Figures

Figures reproduced from arXiv: 2604.02908 by Chuhao Jin, Dayu Wu, Haoyu Shi, Qingzhe Gao, Ruihua Song, Rui Zhang, Yichen Jiang, Yihan Wu.

Figure 1
Figure 1. Figure 1: SentiAvatar generates high-quality 3D human motion and expression, which are semanti [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Overview of SuSuInterActs data pipeline. (1) Character design for a consistent persona. (2) [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Overview of SentiAvatar. (a) Multi-modal inputs are quantized into tokens via encoders. [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Qualitative comparison of generated motions across methods. Each row shows keyframe [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
read the original abstract

We present SentiAvatar, a framework for building expressive interactive 3D digital humans, and use it to create SuSu, a virtual character that speaks, gestures, and emotes in real time. Achieving such a system remains challenging, as it requires jointly addressing three key problems: the lack of large-scale, high-quality multimodal data, robust semantic-to-motion mapping, and fine-grained frame-level motion-prosody synchronization. To solve these problems, first, we build SuSuInterActs (21K clips, 37 hours), a dialogue corpus captured via optical motion capture around a single character with synchronized speech, full-body motion, and facial expressions. Second, we pre-train a Motion Foundation Model on 200K+ motion sequences, equipping it with rich action priors that go well beyond the conversation. We then propose an audio-aware plan-then-infill architecture that decouples sentence-level semantic planning from frame-level prosody-driven interpolation, so that generated motions are both semantically appropriate and rhythmically aligned with speech. Experiments show that SentiAvatar achieves state-of-the-art on both SuSuInterActs (R@1 43.64%, nearly 2 times the best baseline) and BEATv2 (FGD 4.941, BC 8.078), producing 6s of output in 0.3s with unlimited multi-turn streaming. The source code, model, and dataset are available at https://sentiavatar.github.io.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript presents SentiAvatar, a framework for expressive interactive 3D digital humans. It introduces the SuSuInterActs dataset (21K clips, 37 hours) with synchronized speech, full-body motion, and facial expressions; pre-trains a Motion Foundation Model on 200K+ sequences; and proposes an audio-aware plan-then-infill architecture that decouples sentence-level semantic planning from frame-level prosody-driven interpolation. Experiments claim state-of-the-art results on SuSuInterActs (R@1 43.64%, nearly 2x best baseline) and BEATv2 (FGD 4.941, BC 8.078), with real-time performance (6s output in 0.3s) and unlimited multi-turn streaming support. Code, model, and dataset are released.

Significance. If the empirical results hold after addressing evaluation gaps, the work would advance real-time conversational avatar systems by releasing a large-scale multimodal dialogue corpus, rich motion priors from a foundation model, and a decoupled architecture for semantic-rhythmic alignment. The open-sourcing of resources is a clear strength that supports reproducibility and extension in the field.

major comments (3)
  1. [§5 Experiments] §5 Experiments and §5.1: The SOTA claims (R@1 43.64% on SuSuInterActs, nearly 2x baseline; FGD/BC on BEATv2) are reported without details on baseline re-implementations, hyper-parameter choices, training data splits, or potential data leakage between SuSuInterActs and the 200K+ pre-training sequences. This leaves the central performance gains only moderately supported.
  2. [§4.2 Architecture] §4.2 Architecture and §5.2: The plan-then-infill decoupling is presented as solving semantic appropriateness and rhythmic alignment, yet no quantitative metrics or ablations evaluate cross-turn coherence, sentence-boundary discontinuities, foot-sliding, or streaming artifacts. The reported R@1/FGD/BC scores do not directly test the weakest assumption for the multi-turn interactive claim.
  3. [§4.3 Ablations] §4.3 and Table 2: Ablation studies on the contribution of the pre-trained Motion Foundation Model priors versus the infill module are missing; without them, it is unclear whether the reported gains stem from the proposed decoupling or from the foundation model alone.
minor comments (2)
  1. [Figure 4] Figure 4 and §4.1: The caption and text do not specify the exact input/output dimensions or conditioning signals for the semantic planner versus the prosody interpolator.
  2. [§3.2] §3.2: Notation for motion sequences (e.g., use of M_t vs. P_t) is introduced without a consolidated table of symbols.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We appreciate the referee's detailed feedback and constructive suggestions. We address each major comment below and will incorporate revisions to strengthen the manuscript.

read point-by-point responses
  1. Referee: [§5 Experiments] §5 Experiments and §5.1: The SOTA claims (R@1 43.64% on SuSuInterActs, nearly 2x baseline; FGD/BC on BEATv2) are reported without details on baseline re-implementations, hyper-parameter choices, training data splits, or potential data leakage between SuSuInterActs and the 200K+ pre-training sequences. This leaves the central performance gains only moderately supported.

    Authors: We agree that additional details are necessary to fully support the SOTA claims. In the revised manuscript, we will expand §5.1 to include comprehensive information on baseline re-implementations, specific hyper-parameter choices, and the exact training/validation/test splits used. For data leakage, we will clarify that the pre-training sequences come from established public motion datasets (e.g., AMASS, HumanML3D) that do not overlap with our newly captured SuSuInterActs dataset, which was recorded in a controlled setting with a specific character. This will be explicitly documented to ensure transparency. revision: yes

  2. Referee: [§4.2 Architecture] §4.2 Architecture and §5.2: The plan-then-infill decoupling is presented as solving semantic appropriateness and rhythmic alignment, yet no quantitative metrics or ablations evaluate cross-turn coherence, sentence-boundary discontinuities, foot-sliding, or streaming artifacts. The reported R@1/FGD/BC scores do not directly test the weakest assumption for the multi-turn interactive claim.

    Authors: We acknowledge that the current evaluation focuses on per-clip metrics, which primarily assess semantic appropriateness (via R@1) and rhythmic alignment (via FGD/BC). However, the plan-then-infill design inherently supports multi-turn coherence by planning at the sentence level and infilling frames consistently. To address this, we will add new quantitative evaluations in the revised §5.2, including metrics for cross-turn coherence (e.g., motion continuity scores across turns) and analysis of sentence-boundary discontinuities. We will also report on foot-sliding artifacts and streaming performance in multi-turn scenarios. While the real-time streaming capability is demonstrated qualitatively in the supplementary video, we will include supporting quantitative results. revision: partial

  3. Referee: [§4.3 Ablations] §4.3 and Table 2: Ablation studies on the contribution of the pre-trained Motion Foundation Model priors versus the infill module are missing; without them, it is unclear whether the reported gains stem from the proposed decoupling or from the foundation model alone.

    Authors: We agree that isolating the contributions is important. In the revised version, we will expand the ablation studies in §4.3 and Table 2 to include experiments that compare: (1) the full model, (2) the model without the pre-trained Motion Foundation Model (using random initialization), and (3) variants without the infill module. This will clarify the role of each component in achieving the reported performance gains. revision: yes

Circularity Check

0 steps flagged

No circularity detected; claims rest on new data and empirical evaluation

full rationale

The paper constructs a new dataset (SuSuInterActs with 21K clips) and pre-trains a Motion Foundation Model on 200K+ external sequences, then proposes and trains an audio-aware plan-then-infill architecture whose outputs are evaluated on standard metrics (R@1, FGD, BC) and runtime benchmarks. No step reduces by construction to its inputs, no self-citation is load-bearing for the central claims, and the derivation chain is falsifiable through the reported experiments rather than tautological. The architecture choices are presented as design decisions trained on data, not derived from prior self-referential results.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard deep-learning assumptions about transfer of motion priors and the representativeness of the collected dialogue data; no free parameters, axioms, or invented entities are explicitly introduced in the abstract.

axioms (1)
  • domain assumption Pre-trained general motion priors transfer effectively to conversational full-body and facial motions
    Invoked by the use of the 200K+ motion sequence foundation model for the dialogue task.

pith-pipeline@v0.9.0 · 5587 in / 1304 out tokens · 67097 ms · 2026-05-13T20:11:31.721494+00:00 · methodology

discussion (0)

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Forward citations

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