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# [Branched Schrödinger Bridge Matching](https://arxiv.org/abs/2506.09007) (ICLR 2026) 🌳
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[**Sophia Tang**](https://sophtang.github.io/), [**Yinuo Zhang**](https://www.linkedin.com/in/yinuozhang98/), [**Alexander Tong**](https://www.alextong.net/) and [**Pranam Chatterjee**](https://www.chatterjeelab.com/)
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This is the repository for [**Branched Schrödinger Bridge Matching**](https://arxiv.org/abs/2506.09007) (ICLR 2026) 🌳
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Predicting how a population evolves between an initial and final state is central to many problems in generative modeling, from simulating perturbation responses to modelling cell fate decisions 🧫. Existing approaches, such as flow matching and Schrödinger Bridge Matching, effectively learn mappings between two distributions by modelling a single stochastic path. However, these methods are **inherently limited to unimodal transitions and cannot capture branched or divergent evolution from a common origin to multiple distinct outcomes.**
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A key challenge in trajectory matching is reconstructing multi-modal marginals, particularly when modes diverge along distinct dynamical paths
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To address this, we introduce **Branched Schrödinger Bridge Matching (BranchSBM)** 🌳
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🌟 We define the **Branched Generalized Schrödinger Bridge problem** and introduce BranchSBM, a novel matching framework that learns optimal branched trajectories from an initial distribution to multiple target distributions.
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year={2026}
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}
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```
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To use this repository, you agree to abide by the MIT License.
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# [Branched Schrödinger Bridge Matching](https://arxiv.org/abs/2506.09007) (ICLR 2026) 🌳🧫
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[**Sophia Tang**](https://sophtang.github.io/), [**Yinuo Zhang**](https://www.linkedin.com/in/yinuozhang98/), [**Alexander Tong**](https://www.alextong.net/) and [**Pranam Chatterjee**](https://www.chatterjeelab.com/)
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This is the repository for [**Branched Schrödinger Bridge Matching**](https://arxiv.org/abs/2506.09007) (ICLR 2026) 🌳🧫. It is partially built on the [**Metric Flow Matching repo**](https://github.com/kkapusniak/metric-flow-matching) ([Kapusniak et al., 2024](https://arxiv.org/abs/2405.14780)).
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Predicting how a population evolves between an initial and final state is central to many problems in generative modeling, from simulating perturbation responses to modelling cell fate decisions 🧫. Existing approaches, such as flow matching and Schrödinger Bridge Matching, effectively learn mappings between two distributions by modelling a single stochastic path. However, these methods are **inherently limited to unimodal transitions and cannot capture branched or divergent evolution from a common origin to multiple distinct outcomes.**
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A key challenge in trajectory matching is reconstructing multi-modal marginals, particularly when modes diverge along distinct dynamical paths. Existing Schrödinger bridge and flow matching frameworks approximate multi-modal distributions by simulating many *independent* particle trajectories, which are susceptible to mode collapse, with particles concentrating on dominant high-density modes or traversing only low-energy intermediate paths.
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To address this, we introduce **Branched Schrödinger Bridge Matching (BranchSBM)** 🌳🧫, a novel framework that learns a set of diverging velocity fields to reconstruct multi-modal target distributions while simultaneously learning growth networks that allocate mass across branches. Guided by a time-dependent potential energy function Vt, BranchSBM captures diverging, energy-minimizing dynamics without requiring intermediate-time supervision and can generate the full branched evolution from a single initial sample.
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🌟 We define the **Branched Generalized Schrödinger Bridge problem** and introduce BranchSBM, a novel matching framework that learns optimal branched trajectories from an initial distribution to multiple target distributions.
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year={2026}
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}
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```
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To use this repository, you agree to abide by the MIT License.
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