There and Back Again: Bidirectional Diffusion Bridges for Multimodality Translation
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Computer Science > Machine Learning
Title:There and Back Again: Bidirectional Diffusion Bridges for Multimodality Translation
Abstract:Multimodality translation (e.g., text-to-image) is a core generative AI task. However, existing approaches (1) follow generative paths that do not directly represent the source modality, limiting the flexibility of some sampling algorithms; and (2) are unidirectional, preventing inversion (e.g., image-to-text). We propose BIT: Bidirectional Image-Text Diffusion Bridges. In contrast to previous approaches, BIT starts directly from text and interpolates into images, providing (1) a source-aware generative path that enables diverse and flexible sampling algorithms; and (2) an endpoint-conditioned process that can be traversed from image to text, providing a unified, bidirectional generative framework. BIT is derived through stochastic calculus, yielding SDE forms amenable to simulation and tractable loss functions that scale to high dimensions. Our experiments show that BIT is competitive with denoising-diffusion and deterministic-flow baselines, and outperforms them on several vision--language and natural-science evaluations.
| Subjects: | Machine Learning (cs.LG) |
| Cite as: | arXiv:2608.27885 [cs.LG] |
| (or arXiv:2608.27885v1 [cs.LG] for this version) | |
| https://doi.org/10.48550/arXiv.2608.27885
arXiv-issued DOI via DataCite (pending registration)
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