ANTsNormalizingFlows

An updated PyTorch package (from normflows) for discrete normalizing flows.

Quick start

import antsnormflows as nf

# Base distribution (2D diagonal Gaussian)
base = nf.distributions.base.DiagGaussian(2)

# Real NVP with simple MLP conditioner
flows = []
num_layers = 8
for _ in range(num_layers):
    param_map = nf.nets.MLP([1, 64, 64, 2], init_zeros=True)
    flows.append(nf.flows.AffineCouplingBlock(param_map))
    flows.append(nf.flows.Permute(2, mode="swap"))

model = nf.NormalizingFlow(base, flows)
loss = model.forward_kld(x)  # x: (batch, 2)
loss.backward()

Documentation

• Original documentation

Citation

If you use antsnormflows, please cite the corresponding papers:

• Stimper et al. (2023). normflows: A PyTorch Package for Normalizing Flows. Journal of Open Source Software, 8(86), 5361, JOSS.

  BibTeX

  @article{Stimper2023,
    author = {Stimper, Vincent and Liu, David and Campbell, Andrew and Berenz, Vincent and Ryll, Lukas and Schölkopf, Bernhard and Hernández-Lobato, José Miguel},
    title = {normflows: A PyTorch Package for Normalizing Flows},
    journal = {Journal of Open Source Software},
    volume = {8},
    number = {86},
    pages = {5361},
    publisher = {The Open Journal},
    doi = {10.21105/joss.05361},
    url = {https://doi.org/10.21105/joss.05361},
    year = {2023}
  }

• Tustison et al. (2026). Deep Computational Anatomy via Latent-Aligned Multiview Normalizing Flows. bioRxiv.

  BibTeX

  @article{Tustison2026.05.05.723039,
    author = {Tustison, Nicholas James and Avants, Brian B. and Cook, Philip A. and Gee, James C. and Stone, James R.},
    title = {Deep Computational Anatomy via Latent-Aligned Multiview Normalizing Flows},
    elocation-id = {2026.05.05.723039},
    year = {2026},
    doi = {10.64898/2026.05.05.723039},
    publisher = {Cold Spring Harbor Laboratory},
    url = {https://www.biorxiv.org/content/early/2026/05/10/2026.05.05.723039},
    eprint = {https://www.biorxiv.org/content/early/2026/05/10/2026.05.05.723039.full.pdf},
    journal = {bioRxiv}
  }