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Releases

0.9.6dev

New features

  • Implement CG solvers for partial FGW (PR #687)
  • Added feature grad=last_step for ot.solvers.solve (PR #693)
  • Automatic PR labeling and release file update check (PR #704)

Closed issues

  • Fixed ot.mapping solvers which depended on deprecated cvxpy ECOS solver (PR #692, Issue #668)
  • Fixed numerical errors in ot.gmm (PR #690, Issue #689)
  • Add version number to the documentation (PR #696)
  • Update doc for default regularization in ot.unbalanced sinkhorn solvers (Issue #691, PR #700)

0.9.5

November 2024

This new release contains several new features, starting with a novel Gaussian Mixture Model Optimal Transport (GMM-OT) solver to compare GMM while enforcing the transport plan to remain a GMM, that benefits from a closed-form solution making it practical for high-dimensional matching problems. We also extended our general unbalanced OT solvers to support any non-negative reference measure in the regularization terms, before adding the novel translation invariant UOT solver showcasing a higher convergence speed. We also implemented several new solvers and enhanced existing ones to perform OT across spaces. These include a semi-relaxed FGW barycenter solver, coupled with new initialization heuristics for the inner divergence computation, to perform graph partitioning or dictionary learning. Followed by novel unbalanced FGW and Co-optimal transport solvers to promote robustness to outliers in such matching problems. And we finally updated the implementation of partial GW now supporting asymmetric structures and the KL divergence, while leveraging a new generic conditional gradient solver for partial transport problems enabling significant speed improvements. These latest updates required some modifications to the line search functions of our generic conditional gradient solver, paving the way for future improvements to other GW-based solvers. Last but not least, we implemented a pre-commit scheme to automatically correct common programming mistakes likely to be made by our future contributors.

This release also contains few bug fixes, concerning the support of any metric in ot.emd_1d / ot.emd2_1d, and the support of any weights in ot.gaussian.

Breaking change

  • Custom functions provided as parameter line_search to ot.optim.generic_conditional_gradient must now have the signature line_search(cost, G, deltaG, Mi, cost_G, df_G, **kwargs), adding as input df_G the gradient of the regularizer evaluated at the transport plan G. This change aims at improving speed of solvers having quadratic polynomial functions as regularizer such as the Gromov-Wassertein loss (PR #663).

New features

  • New linter based on pre-commit using ruff, codespell and yamllint (PR #681)
  • Added feature mass=True for nx.kl_div (PR #654)
  • Implemented Gaussian Mixture Model OT ot.gmm (PR #649)
  • Added feature semirelaxed_fgw_barycenters and generic FGW-related barycenter updates update_barycenter_structure and update_barycenter_feature (PR #659)
  • Added initialization heuristics for sr(F)GW problems via semirelaxed_init_plan, integrated in all sr(F)GW solvers (PR #659)
  • Improved ot.plot.plot1D_mat (PR #649)
  • Added nx.det (PR #649)
  • nx.sqrtm is now broadcastable (takes ..., d, d) inputs (PR #649)
  • Restructured ot.unbalanced module (PR #658)
  • Added ot.unbalanced.lbfgsb_unbalanced2 and add flexible reference measure c in all unbalanced solvers (PR #658)
  • Implemented Fused unbalanced Gromov-Wasserstein and unbalanced Co-Optimal Transport (PR #677)
  • Notes before depreciating partial Gromov-Wasserstein function in ot.partial moved to ot.gromov (PR #663)
  • Create ot.gromov._partial add new features loss_fun = "kl_loss" and symmetry=False to all solvers while increasing speed + updating adequatly ot.solvers (PR #663)
  • Added ot.unbalanced.sinkhorn_unbalanced_translation_invariant (PR #676)

Closed issues

  • Fixed ot.gaussian ignoring weights when computing means (PR #649, Issue #648)
  • Fixed ot.emd_1d and ot.emd2_1d incorrectly allowing any metric (PR #670, Issue #669)

0.9.4

June 2024

This new release contains several new features and bug fixes. Among the new features we have novel Quantized FGW solvers that can be used to speed up the computation of the FGW loss on large datasets or to promote a structure on the pairwise matrices. We also updated the continuous entropic mapping to provide efficient out-of-sample continuous mapping thanks to entropic regularization. We also have a new general unbalanced solvers for ot.solve and BFGS solver and illustrative example. Finally we have a new solver for the Low Rank Gromov-Wasserstein that can be used to compute the GW distance between two large scale datasets with a low rank approximation.

From a maintenance point of view, we now have a new option to install optional dependencies with pip install POT[all] and the specific backends or submodules' dependencies may also be installed individually. The pip options are: backend-jax, backend-tf, backend-torch, cvxopt, dr, gnn, plot, all. We also provide with this release support for NumPy 2.0 (the wheels should now be compatible with NumPy 2.0 and below). We also fixed several issues such as gradient sign errors for FGW solvers, empty weights for ot.emd2, and line-search in partial GW. We also split the test/test_gromov.py into test/gromov/ to make the tests more manageable.

New features

  • NumPy 2.0 support is added (PR #629)
  • New quantized FGW solvers ot.gromov.quantized_fused_gromov_wasserstein, ot.gromov.quantized_fused_gromov_wasserstein_samples and ot.gromov.quantized_fused_gromov_wasserstein_partitioned (PR #603)
  • ot.gromov._gw.solve_gromov_linesearch now has an argument to specify if the matrices are symmetric in which case the computation can be done faster (PR #607).
  • Continuous entropic mapping (PR #613)
  • New general unbalanced solvers for ot.solve and BFGS solver and illustrative example (PR #620)
  • Add gradient computation with envelope theorem to sinkhorn solver of ot.solve with grad='envelope' (PR #605).
  • Added support for Low rank Gromov-Wasserstein with ot.gromov.lowrank_gromov_wasserstein_samples (PR #614)
  • Optional dependencies may now be installed with pip install POT[all] The specific backends or submodules' dependencies may also be installed individually. The pip options are: backend-jax, backend-tf, backend-torch, cvxopt, dr, gnn, all. The installation of the cupy backend should be done with conda.

Closed issues

  • Fix gpu compatibility of sr(F)GW solvers when G0 is not None(PR #596)
  • Fix doc and example for lowrank sinkhorn (PR #601)
  • Fix issue with empty weights for ot.emd2 (PR #606, Issue #534)
  • Fix a sign error regarding the gradient of ot.gromov._gw.fused_gromov_wasserstein2 and ot.gromov._gw.gromov_wasserstein2 for the kl loss (PR #610)
  • Fix same sign error for sr(F)GW conditional gradient solvers (PR #611)
  • Split test/test_gromov.py into test/gromov/ (PR #619)
  • Fix (F)GW barycenter functions to support computing barycenter on 1 input + deprecate structures as lists (PR #628)
  • Fix line-search in partial GW and change default init to the interior of partial transport plans (PR #602)
  • Fix ot.da.sinkhorn_lpl1_mm compatibility with JAX (PR #592)
  • Fiw linesearch import error on Scipy 1.14 (PR #642, Issue #641)
  • Upgrade supported JAX versions from jax<=0.4.24 to jax<=0.4.30 (PR #643)

0.9.3

January 2024

Closed issues

  • Fixed an issue with cost correction for mismatched labels in ot.da.BaseTransport fit methods. This fix addresses the original issue introduced PR #587 (PR #593)

0.9.2

December 2023

This new release contains several new features and bug fixes. Among the new features we have a new solver for estimation of nearest Brenier potentials (SSNB) that can be used for OT mapping estimation (on small problems), new Bregman Alternated Projected Gradient solvers for GW and FGW, and new solvers for Bures-Wasserstein barycenters. We also provide a first solver for Low Rank Sinkhorn that will be ussed to provide low rak OT extensions in the next releases. Finally we have a new exact line-search for (F)GW solvers with KL loss that can be used to improve the convergence of the solvers.

We also have a new LazyTensor class that can be used to model OT plans and low rank tensors in large scale OT. This class is used to return the plan for the new wrapper for geomloss Sinkhorn solver on empirical samples that can lead to x10/x100 speedups on CPU or GPU and have a lazy implementation that allows solving very large problems of a few millions samples.

We also have a new API for solving OT problems from empirical samples with ot.solve_sample Finally we have a new API for Gromov-Wasserstein solvers with ot.solve_gromov function that centralizes most of the (F)GW methods with unified notation. Some example of how to use the new API below:

# Generate random data
xs, xt = np.random.randn(100, 2), np.random.randn(50, 2)

# Solve OT problem with empirical samples
sol = ot.solve_sample(xs, xt) # Exact OT betwen smaples with uniform weights
sol = ot.solve_sample(xs, xt, wa, wb) # Exact OT with weights given by user

sol = ot.solve_sample(xs, xt, reg= 1, metric='euclidean') # sinkhorn with euclidean metric

sol = ot.solve_sample(xs, xt, reg= 1, method='geomloss') # faster sinkhorn solver on CPU/GPU

sol = ot.solve_sample(x,x2, method='factored', rank=10) # compute factored OT

sol = ot.solve_sample(x,x2, method='lowrank', rank=10) # compute lowrank sinkhorn OT

value_bw = ot.solve_sample(xs, xt, method='gaussian').value # Bures-Wasserstein distance

# Solve GW problem
Cs, Ct = ot.dist(xs, xs), ot.dist(xt, xt) # compute cost matrices
sol = ot.solve_gromov(Cs,Ct) # Exact GW between samples with uniform weights

# Solve FGW problem
M = ot.dist(xs, xt) # compute cost matrix

# Exact FGW between samples with uniform weights
sol = ot.solve_gromov(Cs, Ct, M, loss='KL', alpha=0.7) # FGW with KL data fitting


# recover solutions objects
P = sol.plan # OT plan
u, v = sol.potentials # dual variables
value = sol.value # OT value

# for GW and FGW
value_linear = sol.value_linear # linear part of the loss
value_quad = sol.value_quad # quadratic part of the loss

Users are encouraged to use the new API (it is much simpler) but it might still be subjects to small changes before the release of POT 1.0 .

We also fixed a number of issues, the most pressing being a problem of GPU memory allocation when pytorch is installed that will not happen now thanks to Lazy initialization of the backends. We now also have the possibility to deactivate some backends using environment which prevents POT from importing them and can lead to large import speedup.

New features

  • Added support for Nearest Brenier Potentials (SSNB) (PR #526) + minor fix (PR #535)
  • Tweaked get_backend to ignore None inputs (PR #525)
  • Callbacks for generalized conditional gradient in ot.da.sinkhorn_l1l2_gl are now vectorized to improve performance (PR #507)
  • The linspace method of the backends now has the type_as argument to convert to the same dtype and device. (PR #533)
  • The convolutional_barycenter2d and convolutional_barycenter2d_debiased functions now work with different devices.. (PR #533)
  • New API for Gromov-Wasserstein solvers with ot.solve_gromov function (PR #536)
  • New LP solvers from scipy used by default for LP barycenter (PR #537)
  • Update wheels to Python 3.12 and remove old i686 arch that do not have scipy wheels (PR #543)
  • Upgraded unbalanced OT solvers for more flexibility (PR #539)
  • Add LazyTensor for modeling plans and low rank tensor in large scale OT (PR #544)
  • Add exact line-search for gromov_wasserstein and fused_gromov_wasserstein with KL loss (PR #556)
  • Add KL loss to all semi-relaxed (Fused) Gromov-Wasserstein solvers (PR #559)
  • Further upgraded unbalanced OT solvers for more flexibility and future use (PR #551)
  • New API function ot.solve_sample for solving OT problems from empirical samples (PR #563)
  • Wrapper for `geomloss`` solver on empirical samples (PR #571)
  • Add stop_criterion feature to (un)regularized (f)gw barycenter solvers (PR #578)
  • Add fixed_structure and fixed_features to entropic fgw barycenter solver (PR #578)
  • Add new BAPG solvers with KL projections for GW and FGW (PR #581)
  • Add Bures-Wasserstein barycenter in ot.gaussian and example (PR #582, PR #584)
  • Domain adaptation method SinkhornL1l2Transport now supports JAX backend (PR #587)
  • Added support for Low-Rank Sinkhorn Factorization (PR #568)

Closed issues

  • Fix line search evaluating cost outside of the interpolation range (Issue #502, PR #504)
  • Lazily instantiate backends to avoid unnecessary GPU memory pre-allocations on package import (Issue #516, PR #520)
  • Handle documentation and warnings when integers are provided to (f)gw solvers based on cg (Issue #530, PR #559)
  • Correct independence of fgw_barycenters to init_C and init_X (Issue #547, PR #566)
  • Avoid precision change when computing norm using PyTorch backend (Discussion #570, PR #572)
  • Create ot/bregman/repository (Issue #567, PR #569)
  • Fix matrix feature shape in entropic_fused_gromov_barycenters(Issue #574, PR #573)
  • Fix (fused) gromov-wasserstein barycenter solvers to support kl_loss(PR #576)

0.9.1

August 2023

This new release contains several new features and bug fixes.

New features include a new submodule ot.gnn that contains two new Graph neural network layers (compatible with Pytorch Geometric) for template-based pooling of graphs with an example on graph classification. Related to this, we also now provide FGW and semi relaxed FGW solvers for which the resulting loss is differentiable w.r.t. the parameter alpha. Other contributions on the (F)GW front include a new solver for the Proximal Point algorithm that can be used to solve entropic GW problems (using the parameter solver="PPA"), new solvers for entropic FGW barycenters, novels Sinkhorn-based solvers for entropic semi-relaxed (F)GW, the possibility to provide a warm-start to the solvers, and optional marginal weights of the samples (uniform weights ar used by default). Finally we added in the submodule ot.gaussian and ot.da new loss and mapping estimators for the Gaussian Gromov-Wasserstein that can be used as a fast alternative to GW and estimates linear mappings between unregistered spaces that can potentially have different size (See the update linear mapping example for an illustration).

We also provide a new solver for the Entropic Wasserstein Component Analysis that is a generalization of the celebrated PCA taking into account the local neighborhood of the samples. We also now have a new solver in ot.smooth for the sparsity-constrained OT (last plot) that can be used to find regularized OT plans with sparsity constraints. Finally we have a first multi-marginal solver for regular 1D distributions with a Monge loss (see here).

The documentation and testings have also been updated. We now have nearly 95% code coverage with the tests. The documentation has been updated and some examples have been streamlined to build more quickly and avoid timeout problems with CircleCI. We also added an optional CI on GPU for the master branch and approved PRs that can be used when a GPU runner is online.

Many other bugs and issues have been fixed and we want to thank all the contributors, old and new, who made this release possible. More details below.

New features

  • Added Bures Wasserstein distance in ot.gaussian (PR ##428)
  • Added Generalized Wasserstein Barycenter solver + example (PR #372), fixed graphical details on the example (PR #376)
  • Added Free Support Sinkhorn Barycenter + example (PR #387)
  • New API for OT solver using function ot.solve (PR #388)
  • Backend version of ot.partial and ot.smooth (PR #388)
  • Added argument for warmstart of dual vectors in Sinkhorn-based methods in ot.bregman (PR #437)

Closed issues

  • Fixed an issue with the documentation gallery sections (PR #395)
  • Fixed an issue where sinkhorn divergence did not have a gradients (Issue #393, PR #394)
  • Fixed an issue where we could not ask TorchBackend to place a random tensor on GPU (Issue #371, PR #373)
  • Fixed an issue where Sinkhorn solver assumed a symmetric cost matrix (Issue #374, PR #375)
  • Fixed an issue where hitting iteration limits would be reported to stderr by std::cerr regardless of Python's stderr stream status (PR #377)
  • Fixed an issue where the metric argument in ot.dist did not allow a callable parameter (Issue #378, PR #379)
  • Fixed an issue where the max number of iterations in ot.emd was not allowed to go beyond 2^31 (PR #380)
  • Fixed an issue where pointers would overflow in the EMD solver, returning an incomplete transport plan above a certain size (slightly above 46k, its square being roughly 2^31) (PR #381)
  • Error raised when mass mismatch in emd2 (PR #386)
  • Fixed an issue where a pytorch example would throw an error if executed on a GPU (Issue #389, PR #391)
  • Added a work-around for scipy's bug, where you cannot compute the Hamming distance with a "None" weight attribute. (Issue #400, PR #402)
  • Fixed an issue where the doc could not be built due to some changes in matplotlib's API (Issue #403, PR #402)
  • Replaced Numpy C Compiler with Setuptools C Compiler due to deprecation issues (Issue #408, PR #409)
  • Fixed weak optimal transport docstring (Issue #404, PR #410)
  • Fixed error with parameter log=Truefor SinkhornLpl1Transport (Issue #412, PR #413)
  • Fixed an issue about warn parameter in sinkhorn2 (PR #417)
  • Fix an issue where the parameter stopThr in empirical_sinkhorn_divergence was rendered useless by subcalls that explicitly specified stopThr=1e-9 (Issue #421, PR #422).
  • Fixed a bug breaking an example where we would try to make an array of arrays of different shapes (Issue #424, PR #425)

0.8.2

This releases introduces several new notable features. The less important but most exiting one being that we now have a logo for the toolbox (color and dark background) :

This logo is generated using with matplotlib and using the solution of an OT problem provided by POT (with ot.emd). Generating the logo can be done with a simple python script also provided in the documentation gallery.

New OT solvers include Weak OT and OT with factored coupling that can be used on large datasets. The Majorization Minimization solvers for non-regularized Unbalanced OT are now also available. We also now provide an implementation of GW and FGW unmixing and dictionary learning. It is now possible to use autodiff to solve entropic an quadratic regularized OT in the dual for full or stochastic optimization thanks to the new functions to compute the dual loss for entropic and quadratic regularized OT and reconstruct the OT plan on part or all of the data. They can be used for instance to solve OT problems with stochastic gradient or for estimating the dual potentials as neural networks.

On the backend front, we now have backend compatible functions and classes in the domain adaptation ot.da and unbalanced OT ot.unbalanced modules. This means that the DA classes can be used on tensors from all compatible backends. The free support Wasserstein barycenter solver is now also backend compatible.

Finally we have worked on the documentation to provide an update of existing examples in the gallery and and several new examples including GW dictionary learning weak Optimal Transport, NN based dual potentials estimation and Factored coupling OT. .

New features

  • Remove deprecated ot.gpu submodule (PR #361)
  • Update examples in the gallery (PR #359)
  • Add stochastic loss and OT plan computation for regularized OT and backend examples(PR #360)
  • Implementation of factored OT with emd and sinkhorn (PR #358)
  • A brand new logo for POT (PR #357)
  • Better list of related examples in quick start guide with minigallery (PR #334)
  • Add optional log-domain Sinkhorn implementation in WDA to support smaller values of the regularization parameter (PR #336)
  • Backend implementation for ot.lp.free_support_barycenter (PR #340)
  • Add weak OT solver + example (PR #341)
  • Add backend support for Domain Adaptation and Unbalanced solvers (PR #343)
  • Add (F)GW linear dictionary learning solvers + example (PR #319)
  • Add links to related PR and Issues in the doc release page (PR #350)
  • Add new minimization-maximization algorithms for solving exact Unbalanced OT + example (PR #362)

Closed issues

  • Fix mass gradient of ot.emd2 and ot.gromov_wasserstein2 so that they are centered (Issue #364, PR #363)
  • Fix bug in instantiating an autograd function ValFunction (Issue #337, PR #338)
  • Fix POT ABI compatibility with old and new numpy (Issue #346, PR #349)
  • Warning when feeding integer cost matrix to EMD solver resulting in an integer transport plan (Issue #345, PR #343)
  • Fix bug where gromov_wasserstein2 does not perform backpropagation with CUDA tensors (Issue #351, PR #352)

0.8.1.0

December 2021

This is a bug fix release that will remove the benchmarks module form the installation and correct the documentation generation.

Closed issues

  • Bug in documentation generation (tag VS master push, PR #332)
  • Remove installation of the benchmarks in global namespace (Issue #331, PR #333)

0.8.1

December 2021

This release fixes several bugs and introduces two new backends: Cupy and Tensorflow. Note that the tensorflow backend will work only when tensorflow has enabled the Numpy behavior (for transpose that is not by default in tensorflow). We also introduce a simple benchmark on CPU GPU for the sinkhorn solver that will be provided in the backend documentation.

This release also brings a few changes in dependencies and compatibility. First we removed tests for Python 3.6 that will not be updated in the future. Also note that POT now depends on Numpy (>= 1.20) because a recent change in ABI is making the wheels non-compatible with older numpy versions. If you really need an older numpy POT will work with no problems but you will need to build it from source.

As always we want to that the contributors who helped make POT better (and bug free).

New features

  • New benchmark for sinkhorn solver on CPU/GPU and between backends (PR #316)
  • New tensorflow backend (PR #316)
  • New Cupy backend (PR #315)
  • Documentation always up-to-date with README, RELEASES, CONTRIBUTING and CODE_OF_CONDUCT files (PR #316, PR #322).

Closed issues

  • Fix bug in older Numpy ABI (<1.20) (Issue #308, PR #326)
  • Fix bug in ot.dist function when non euclidean distance (Issue #305, PR #306)
  • Fix gradient scaling for functions using nx.set_gradients (Issue #309, PR #310)
  • Fix bug in generalized Conditional gradient solver and SinkhornL1L2 (Issue #311, PR #313)
  • Fix log error in gromov_barycenters (Issue #317, PR #3018)

0.8.0

November 2021

This new stable release introduces several important features.

First we now have an OpenMP compatible exact ot solver in ot.emd. The OpenMP version is used when the parameter numThreads is greater than one and can lead to nice speedups on multi-core machines.

Second we have introduced a backend mechanism that allows to use standard POT function seamlessly on Numpy, Pytorch and Jax arrays. Other backends are coming but right now POT can be used seamlessly for training neural networks in Pytorch. Notably we propose the first differentiable computation of the exact OT loss with ot.emd2 (can be differentiated w.r.t. both cost matrix and sample weights), but also for the classical Sinkhorn loss with ot.sinkhorn2, the Wasserstein distance in 1D with ot.wasserstein_1d, sliced Wasserstein with ot.sliced_wasserstein_distance and Gromov-Wasserstein with ot.gromov_wasserstein2. Examples of how this new feature can be used are now available in the documentation where the Pytorch backend is used to estimate a minimal Wasserstein estimator, a Generative Network (GAN), for a sliced Wasserstein gradient flow and optimizing the Gromov-Wassersein distance. Note that the Jax backend is still in early development and quite slow at the moment, we strongly recommend for Jax users to use the OTT toolbox when possible. As a result of this new feature, the old ot.gpu submodule is now deprecated since GPU implementations can be done using GPU arrays on the torch backends.

Other novel features include implementation for Sampled Gromov Wasserstein and Pointwise Gromov Wasserstein, Sinkhorn in log space with method='sinkhorn_log', Projection Robust Wasserstein, ans deviased Sinkorn barycenters.

This release will also simplify the installation process. We have now a pyproject.toml that defines the build dependency and POT should now build even when cython is not installed yet. Also we now provide pe-compiled wheels for linux aarch64 that is used on Raspberry PI and android phones and for MacOS on ARM processors.

Finally POT was accepted for publication in the Journal of Machine Learning Research (JMLR) open source software track and we ask the POT users to cite this paper from now on. The documentation has been improved in particular by adding a "Why OT?" section to the quick start guide and several new examples illustrating the new features. The documentation now has two version : the stable version https://pythonot.github.io/ corresponding to the last release and the master version https://pythonot.github.io/master that corresponds to the current master branch on GitHub.

As usual, we want to thank all the POT contributors (now 37 people have contributed to the toolbox). But for this release we thank in particular Nathan Cassereau and Kamel Guerda from the AI support team at IDRIS for their support to the development of the backend and OpenMP implementations.

New features

  • OpenMP support for exact OT solvers (PR #260)
  • Backend for running POT in numpy/torch + exact solver (PR #249)
  • Backend implementation of most functions in ot.bregman (PR #280)
  • Backend implementation of most functions in ot.optim (PR #282)
  • Backend implementation of most functions in ot.gromov (PR #294, PR #302)
  • Test for arrays of different type and device (CPU/GPU) (PR #304, #303)
  • Implementation of Sinkhorn in log space with method='sinkhorn_log' (PR #290)
  • Implementation of regularization path for L2 Unbalanced OT (PR #274)
  • Implementation of Projection Robust Wasserstein (PR #267)
  • Implementation of Debiased Sinkhorn Barycenters (PR #291)
  • Implementation of Sampled Gromov Wasserstein and Pointwise Gromov Wasserstein (PR #275)
  • Add pyproject.toml and build POT without installing cython first (PR #293)
  • Lazy implementation in log space for sinkhorn on samples (PR #259)
  • Documentation cleanup (PR #298)
  • Two up-to-date documentations for stable release and for master branch.
  • Building wheels on ARM for Raspberry PI and smartphones (PR #238)
  • Update build wheels to new version and new pythons (PR #236, #253)
  • Implementation of sliced Wasserstein distance (Issue #202, PR #203)
  • Add minimal build to CI and perform pep8 test separately (PR #210)
  • Speedup of tests and return run time (PR #262)
  • Add "Why OT" discussion to the documentation (PR #220)
  • New introductory example to discrete OT in the documentation (PR #191)
  • Add templates for Issues/PR on Github (PR#181)

Closed issues

  • Debug Memory leak in GAN example (#254)
  • DEbug GPU bug (Issue #284, #287, PR #288)
  • set_gradients method for JAX backend (PR #278)
  • Quicker GAN example for CircleCI build (PR #258)
  • Better formatting in Readme (PR #234)
  • Debug CI tests (PR #240, #241, #242)
  • Bug in Partial OT solver dummy points (PR #215)
  • Bug when Armijo linesearch (Issue #184, #198, #281, PR #189, #199, #286)
  • Bug Barycenter Sinkhorn (Issue 134, PR #195)
  • Infeasible solution in exact OT (Issues #126,#93, PR #217)
  • Doc for SUpport Barycenters (Issue #200, PR #201)
  • Fix labels transport in BaseTransport (Issue #207, PR #208)
  • Bug in emd_1d, non respected bounds (Issue #169, PR #170)
  • Removed Python 2.7 support and update codecov file (PR #178)
  • Add normalization for WDA and test it (PR #172, #296)
  • Cleanup code for new version of flake8 (PR #176)
  • Fixed requirements in setup.py (PR #174)
  • Removed specific MacOS flags (PR #175)

0.7.0

May 2020

This is the new stable release for POT. We made a lot of changes in the documentation and added several new features such as Partial OT, Unbalanced and Multi Sources OT Domain Adaptation and several bug fixes. One important change is that we have created the GitHub organization PythonOT that now owns the main POT repository https://github.com/PythonOT/POT and the repository for the new documentation is now hosted at https://PythonOT.github.io/.

This is the first release where the Python 2.7 tests have been removed. Most of the toolbox should still work but we do not offer support for Python 2.7 and will close related Issues.

A lot of changes have been done to the documentation that is now hosted on https://PythonOT.github.io/ instead of readthedocs. It was a hard choice but readthedocs did not allow us to run sphinx-gallery to update our beautiful examples and it was a huge amount of work to maintain. The documentation is now automatically compiled and updated on merge. We also removed the notebooks from the repository for space reason and also because they are all available in the example gallery. Note that now the output of the documentation build for each commit in the PR is available to check that the doc builds correctly before merging which was not possible with readthedocs.

The CI framework has also been changed with a move from Travis to Github Action which allows to get faster tests on Windows, MacOS and Linux. We also now report our coverage on Codecov.io and we have a reasonable 92% coverage. We also now generate wheels for a number of OS and Python versions at each merge in the master branch. They are available as outputs of this action. This will allow simpler multi-platform releases from now on.

In terms of new features we now have OTDA Classes for unbalanced OT, a new Domain adaptation class form multi domain problems (JCPOT), and several solvers to solve the Partial Optimal Transport problems.

This release is also the moment to thank all the POT contributors (old and new) for helping making POT such a nice toolbox. A lot of changes (also in the API) are coming for the next versions.

Features

  • New documentation on https://PythonOT.github.io/ (PR #160, PR #143, PR #144)
  • Documentation build on CircleCI with sphinx-gallery (PR #145,PR #146, #155)
  • Run sphinx gallery in CI (PR #146)
  • Remove notebooks from repo because available in doc (PR #156)
  • Build wheels in CI (#157)
  • Move from travis to GitHub Action for Windows, MacOS and Linux (PR #148, PR #150)
  • Partial Optimal Transport (PR#141 and PR #142)
  • Laplace regularized OTDA (PR #140)
  • Multi source DA with target shift (PR #137)
  • Screenkhorn algorithm (PR #121)

Closed issues

  • Add JMLR paper to the readme and Mathieu Blondel to the Acknoledgments (PR #231, #232)
  • Bug in Unbalanced OT example (Issue #127)
  • Clean Cython output when calling setup.py clean (Issue #122)
  • Various Macosx compilation problems (Issue #113, Issue #118, PR#130)
  • EMD dimension mismatch (Issue #114, Fixed in PR #116)
  • 2D barycenter bug for non square images (Issue #124, fixed in PR #132)
  • Bad value in EMD 1D (Issue #138, fixed in PR #139)
  • Log bugs for Gromov-Wassertein solver (Issue #107, fixed in PR #108)
  • Weight issues in barycenter function (PR #106)

0.6.0

July 2019

This is the first official stable release of POT and this means a jump to 0.6! The library has been used in the wild for a while now and we have reached a state where a lot of fundamental OT solvers are available and tested. It has been quite stable in the last months but kept the beta flag in its Pypi classifiers until now.

Note that this release will be the last one supporting officially Python 2.7 (See https://python3statement.org/ for more reasons). For next release we will keep the travis tests for Python 2 but will make them non necessary for merge in 2020.

The features are never complete in a toolbox designed for solving mathematical problems and research but with the new contributions we now implement algorithms and solvers from 24 scientific papers (listed in the README.md file). New features include a direct implementation of the empirical Sinkhorn divergence, a new efficient (Cython implementation) solver for EMD in 1D and corresponding Wasserstein 1D. We now also have implementations for Unbalanced OT and a solver for Unbalanced OT barycenters. A new variant of Gromov-Wasserstein divergence called Fused Gromov-Wasserstein has been also contributed with exemples of use on structured data and computing barycenters of labeld graphs.

A lot of work has been done on the documentation with several new examples corresponding to the new features and a lot of corrections for the docstrings. But the most visible change is a new quick start guide for POT that gives several pointers about which function or classes allow to solve which specific OT problem. When possible a link is provided to relevant examples.

We will also provide with this release some pre-compiled Python wheels for Linux 64bit on github and pip. This will simplify the install process that before required a C compiler and numpy/cython already installed.

Finally we would like to acknowledge and thank the numerous contributors of POT that has helped in the past build the foundation and are still contributing to bring new features and solvers to the library.

Features

  • Add compiled manylinux 64bits wheels to pip releases (PR #91)
  • Add quick start guide (PR #88)
  • Make doctest work on travis (PR #90)
  • Update documentation (PR #79, PR #84)
  • Solver for EMD in 1D (PR #89)
  • Solvers for regularized unbalanced OT (PR #87, PR#99)
  • Solver for Fused Gromov-Wasserstein (PR #86)
  • Add empirical Sinkhorn and empirical Sinkhorn divergences (PR #80)

Closed issues

  • Issue #59 fail when using "pip install POT" (new details in doc+ hopefully wheels)
  • Issue #85 Cannot run gpu modules
  • Issue #75 Greenkhorn do not return log (solved in PR #76)
  • Issue #82 Gromov-Wasserstein fails when the cost matrices are slightly different
  • Issue #72 Macosx build problem

0.5.0

Sep 2018

POT is 2 years old! This release brings numerous new features to the toolbox as listed below but also several bug correction.

Among the new features, we can highlight a non-regularized Gromov-Wasserstein solver, a new greedy variant of sinkhorn, non-regularized, convolutional (2D) and free support Wasserstein barycenters and smooth and stochastic implementation of entropic OT.

POT 0.5 also comes with a rewriting of ot.gpu using the cupy framework instead of the unmaintained cudamat. Note that while we tried to keed changes to the minimum, the OTDA classes were deprecated. If you are happy with the cudamat implementation, we recommend you stay with stable release 0.4 for now.

The code quality has also improved with 92% code coverage in tests that is now printed to the log in the Travis builds. The documentation has also been greatly improved with new modules and examples/notebooks.

This new release is so full of new stuff and corrections thanks to the old and new POT contributors (you can see the list in the readme).

Features

  • Add non regularized Gromov-Wasserstein solver (PR #41)
  • Linear OT mapping between empirical distributions and 90% test coverage (PR #42)
  • Add log parameter in class EMDTransport and SinkhornLpL1Transport (PR #44)
  • Add Markdown format for Pipy (PR #45)
  • Test for Python 3.5 and 3.6 on Travis (PR #46)
  • Non regularized Wasserstein barycenter with scipy linear solver and/or cvxopt (PR #47)
  • Rename dataset functions to be more sklearn compliant (PR #49)
  • Smooth and sparse Optimal transport implementation with entropic and quadratic regularization (PR #50)
  • Stochastic OT in the dual and semi-dual (PR #52 and PR #62)
  • Free support barycenters (PR #56)
  • Speed-up Sinkhorn function (PR #57 and PR #58)
  • Add convolutional Wassersein barycenters for 2D images (PR #64)
  • Add Greedy Sinkhorn variant (Greenkhorn) (PR #66)
  • Big ot.gpu update with cupy implementation (instead of un-maintained cudamat) (PR #67)

Deprecation

Deprecated OTDA Classes were removed from ot.da and ot.gpu for version 0.5 (PR #48 and PR #67). The deprecation message has been for a year here since 0.4 and it is time to pull the plug.

Closed issues

  • Issue #35 : remove import plot from ot/init.py (See PR #41)
  • Issue #43 : Unusable parameter log for EMDTransport (See PR #44)
  • Issue #55 : UnicodeDecodeError: 'ascii' while installing with pip

0.4

15 Sep 2017

This release contains a lot of contribution from new contributors.

Features

  • Automatic notebooks and doc update (PR #27)
  • Add gromov Wasserstein solver and Gromov Barycenters (PR #23)
  • emd and emd2 can now return dual variables and have max_iter (PR #29 and PR #25)
  • New domain adaptation classes compatible with scikit-learn (PR #22)
  • Proper tests with pytest on travis (PR #19)
  • PEP 8 tests (PR #13)

Closed issues

  • emd convergence problem du to fixed max iterations (#24)
  • Semi supervised DA error (#26)

0.3.1

11 Jul 2017

  • Correct bug in emd on windows

0.3

7 Jul 2017

  • emd* and sinkhorn* are now performed in parallel for multiple target distributions
  • emd and sinkhorn are for OT matrix computation
  • emd2 and sinkhorn2 are for OT loss computation
  • new notebooks for emd computation and Wasserstein Discriminant Analysis
  • relocate notebooks
  • update documentation
  • clean_zeros(a,b,M) for removimg zeros in sparse distributions
  • GPU implementations for sinkhorn and group lasso regularization

V0.2

7 Apr 2017

  • New dimensionality reduction method (WDA)
  • Efficient method emd2 returns only tarnsport (in paralell if several histograms given)

0.1.11

5 Jan 2017

  • Add sphinx gallery for better documentation
  • Small efficiency tweak in sinkhorn
  • Add simple tic() toc() functions for timing

0.1.10

7 Nov 2016

  • numerical stabilization for sinkhorn (log domain and epsilon scaling)

0.1.9

4 Nov 2016

  • Update classes and examples for domain adaptation
  • Joint OT matrix and mapping estimation

0.1.7

31 Oct 2016

  • Original Domain adaptation classes

0.1.3

  • pipy works

First pre-release

28 Oct 2016

It provides the following solvers:

  • OT solver for the linear program/ Earth Movers Distance.
  • Entropic regularization OT solver with Sinkhorn Knopp Algorithm.
  • Bregman projections for Wasserstein barycenter [3] and unmixing.
  • Optimal transport for domain adaptation with group lasso regularization
  • Conditional gradient and Generalized conditional gradient for regularized OT.

Some demonstrations (both in Python and Jupyter Notebook format) are available in the examples folder.