Total variation bounds for Schrödinger--Föllmer sampling of boundary-vanishing densities

Abstract

We derive total variation bounds for the Schrödinger--Föllmer sampler when the target density vanishes at the boundary of its support. This boundary behavior produces a terminal-time singularity in the drift near the boundary. We first prove a base estimate under a single quantitative hypothesis, finiteness of the relative Fisher information, without assuming boundedness or Lipschitz continuity of the drift. We then combine this estimate with a mixture regularization, thereby reducing the problem to determining the growth rate of the regularized Fisher information. For densities with an exact polynomial vanishing order on the boundary of a smooth bounded domain, we determine this growth rate and its leading constant. Orders above one yield the square-root rate in the number of steps, with a logarithmic loss at order one. For orders between one half and one, the rate exponent decreases continuously from one half toward one third. Finite mixtures of triangular kernel densities fall into the linear case.

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BibTeX

@misc{kaneko2026total,
  title = {{Total variation bounds for Schrödinger--Föllmer sampling of boundary-vanishing densities}},
  author = {Tatsuya Kaneko and Yumiharu Nakano},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.02542},
  eprint = {2611.02542},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.02542},
}

RIS

TY  - UNPB
TI  - Total variation bounds for Schrödinger--Föllmer sampling of boundary-vanishing densities
AU  - Tatsuya Kaneko
AU  - Yumiharu Nakano
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.02542
UR  - https://arxiv.org/abs/2611.02542
AB  - We derive total variation bounds for the Schrödinger--Föllmer sampler when the target density vanishes at the boundary of its support. This boundary behavior produces a terminal-time singularity in the drift near the boundary. We first prove a base estimate under a single quantitative hypothesis, finiteness of the relative Fisher information, without assuming boundedness or Lipschitz continuity of the drift. We then combine this estimate with a mixture regularization, thereby reducing the problem to determining the growth rate of the regularized Fisher information. For densities with an exact polynomial vanishing order on the boundary of a smooth bounded domain, we determine this growth rate and its leading constant. Orders above one yield the square-root rate in the number of steps, with a logarithmic loss at order one. For orders between one half and one, the rate exponent decreases continuously from one half toward one third. Finite mixtures of triangular kernel densities fall into the linear case.
ER  -

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