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From Tokens to Trajectories: Parameter-Efficient Continuous Adaptation of Unified Multimodal Models

Summary

FlowShift converts pre-trained discrete unified multimodal models into continuous rectified-flow generators using LoRA and dual-objective velocity vector distillation, significantly improving image generation quality while preserving over 99.5% of multimodal understanding.

SourcearXiv Computer VisionAuthor: Gayatri Deshmukh, Onkar Susladkar, Adheesh Juvekar, Halil Kilicoglu, Ismini Lourentzou
From Tokens to Trajectories: Parameter-Efficient Continuous Adaptation of Unified Multimodal Models
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[Submitted on 3 Nov 2026]

Title:From Tokens to Trajectories: Parameter-Efficient Continuous Adaptation of Unified Multimodal Models

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Abstract:While discrete tokenization in Unified Multimodal Models (UMMs) establishes strong semantic reasoning, it introduces a strict quantization bottleneck that degrades fine-grained visual details, often resulting in structurally accurate but artifact-heavy images. We introduce FlowShift, a parameter-efficient post-training framework that bypasses this bottleneck by converting pre-trained discrete UMMs into continuous rectified-flow generators. Instead of discarding the backbone's semantic priors, FlowShift replaces discrete visual interfaces with continuous latent projections and applies LoRA to the attention layers. To efficiently boost visual quality without semantic drift, we propose Dual-Objective Velocity Vector Distillation (DOVD), which aligns the model with a high-fidelity continuous teacher and ground-truth continuous trajectories. This approach drastically improves perceptual quality while preserving prompt adherence and reasoning. When applied to leading discrete UMMs, FlowShift significantly improves COCO-30K FID and aesthetic scores, while retaining over 99.5% of multimodal understanding capabilities. Ablations confirm DOVD drives generation quality. Ultimately, FlowShift achieves high-fidelity continuous generation without sacrificing pre-trained semantic grounding.

Subjects:

Computer Vision and Pattern Recognition (cs.CV)

Cite as: arXiv:2611.05451 [cs.CV]

(or arXiv:2611.05451v1 [cs.CV] for this version)

https://doi.org/10.48550/arXiv.2611.05451

arXiv-issued DOI via DataCite

Submission history

From: Onkar Susladkar [view email] [v1] Tue, 3 Nov 2026 18:31:48 UTC (3,170 KB)

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Key points

  • FlowShift replaces discrete visual interfaces with continuous latent projections and applies LoRA to attention layers, retaining semantic priors.
  • Dual-objective velocity vector distillation (DOVD) aligns the model with a high-fidelity teacher and ground-truth continuous trajectories.
  • Significant improvements in COCO-30K FID and aesthetic scores with over 99.5% retention of multimodal understanding capabilities.

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