What’s new in boost-histogram

Version 1.1

User changes

  • Experimentally support list selection on categorical axes #577

  • Support Python 3.8 on Apple Silicon #600

  • Scaling and addition with a scalar affect flow bins too #580

  • Change sum_of_deltas_squared to _sum_of_deltas_squared (was an implementation detail) #602

Bug fixes

  • Fix “picking” on a flow bin #576

  • Better error message on getattr #596

Developer changes

  • Test on Python 3.10 beta releases #600

  • Provide a CMakeLists for quick standalone Boost.Histogram C++ experiments #591

  • Adding logging with pytest failure output #575

Version 1.0

Version 1.0.2

  • Fix scaling a weighted storage #559

  • Fix partial summation over a Categorical axis #564

  • Support running type checking from Python < 3.8 #542

Version 1.0.1

Subclassing Histogram changes

  • A family= is no longer required if you only subclass Histogram. #533

Bug fixes

  • Fix summing of Mean/WeightedMean accumulators #537

  • Added missing dependency on typing_extensions for Python 3.6 & 3.7 #529

Typing changes

  • Added Ellipsis support to typing. #525

  • Better typing for Views. #530

  • Fixed issue with Histogram copy constructor requiring metadata #532

Version 1.0.0

Dropped support for Python 2 and 3.5; removed large numbers of workarounds. Fully statically typed. API compatible with the final 0.x release for most uses, except for subclassing; subclassing histogram components now uses Python 3 class keyword syntax to set families.

User changes

  • Dropped Python 2.7 and 3.5 support #512

  • Removed deprecated .options from axes. Use .traits instead. #503

  • Full static typing available, UHI 0.1.2+ supported. #516, #517, #519, #520, #521, #523

Subclassing Histogram changes

  • Use keyword class family setting when subclassing histogram components instead of custom decorator. #513

  • Structure of internal repr creation changed and made slightly more public. #518

Bug fixes

  • Consistently show metadata= in repr if present; refactored internal repr handling #518

  • Minor typing related fixes for rare bugs (especially in numpy.py, #521)

Version 0.13

Version 0.13.2

  • Backport fix scaling a weighted storage

  • Backport fix partial summation over a Categorical axis

Version 0.13.1

  • Backport fix for Mean/WeightedMean summing.

  • Backport fix for boost_histogram.numpy density.

  • Backport missing metadata from the repr’s.

  • Ignore family= on Histogram subclassing to make subclassing Histogram only possible in 1.x + 0.x code.

Version 0.13.0

PlottableProtocol provides a way to plot in different libraries, and easy access to common quantities. This is expected to be the final release for Python 2, and mostly equivalent in API to 1.0.

User changes

  • Support for PlottableProtocol. You can now access .values(), .counts(), and .variances() on all storages; used by plotting libraries. .kind describes the Kind of the histogram (bh.Kind.COUNT or bh.Kind.MEAN). .options has been renamed to .traits, and a few more useful traits were added, like .discrete. Most other portions of the Protocol were already present. #476

  • Removed deprecated .rank on histograms (since 0.8). Use .ndim instead. #505

  • Supports converting user histogram objects that provide a _to_boost_histogram_ method. #483

  • A view=True parameter must now be passed to get a View instead of a standard NumPy values array from to_numpy(). #498

Bug fixes

  • Added additional support for typing, fixing a couple of rare Python 2 bugs in the process #493.

  • The resulting histogram from bh.numpy.* functions is now reducible #508

Developer changes

  • Use GitHub Actions for ARM compiling #474

  • Apple Silicon support (since 0.12) #495

  • Support compiling with C++17 #502

  • Rename NPY_NUM_BUILD_JOBS to CMAKE_BUILD_PARALLEL_LEVEL for consistency with other Scikit-HEP projects. #502

Version 0.12

Version 0.12.0

Pressing forward to 1.0.

User changes

  • You can now set all complex storages, either on a Histogram or a View with an (N+1)D array #475

  • Axes are now normal __dict__ classes, you can manipulate the __dict__ as normal. Axes construction now lets you either use the old metadata shortcut or the __dict__ inline. #477

Bug fixes

  • Fixed slicing projection with one-sided slices #479

  • Fixed issue if final bin of Variable histogram was infinite by updating to Boost 1.75 #470

  • NumPy arrays can be used for weights in bh.numpy #472

  • Vectorization for WeightedMean accumulators was broken #475

Developer changes

  • Bumped to pybind11 version #470

  • Black formatting used in notebooks too #470

Upgrade warning

If you are using Axis.options, please transition to Axis.traits. traits includes all the old options, along with some new traits, and matches the PlottableProtocol requirements.

Version 0.11

Version 0.11.1

Updating pybind11 to 2.6.0. #443 Features:

  • Python 3.9 support

  • PyPy2 / PyPy3.6 / PyPy3.7 support

  • Warnings on latest AppleClang fixed

  • 40% faster accumulator fills, simpler implementation

  • Segfaults when passing an object with a throwing repr fixed

  • kwargs replaced older workarounds (partially at the moment)

  • Using new py::type instead of pybind11::detail usage

  • Enhanced CMake support, finds conda and venv now, uses pybind11_find_import

  • Using setuptools support from pybind11 (previously vendored, so benefits have been available since 0.11.0)

Also cleans up SDists a bit. #467

Version 0.11.0

A release focused on preparing for the upcoming Hist 2.0 release.

User changes

  • Arbitrary items can be set on an axis or histogram. #450, #456

  • Subclasses can customize the conversion procedure. #456

Bug fixes

  • Fixed reading pickles from boost-histogram 0.6-0.8 #445

  • Minor correctness fix #446

  • Accidental install of typing on Python 3.5+ fixed

  • Scalar ND fill fixed #453

Developer changes

  • Updated to Boost 1.74 #442

  • CMake installs version.py now too #449

  • Updated setuptools infrastructure no longer requires NumPy #451

  • Some basic clang-tidy checks are now being run #455

Version 0.10

Version 0.10.2

Quick fix for extra print statement in fill.

Bug fixes

  • Fixed debugging print statement in fill. #438

Developer changes

  • Added CI/pre-commit check for print statements #438

  • Formatting CMakeLists now too #439

Version 0.10.1

Several fixes were made, mostly related to Weight storage histograms from Uproot 4.

Bug fixes

  • Reduction on h.axes.widths supported again #428

  • WeightedSumView supports standard array operations #432

  • Operations shallow copy (non-copyable metadata supported) #433

  • Pandas Series as samples/weights supported #434

  • Support NumPy scalars in operations #436

Version 0.10.0

This version was released during PyHEP 2020. Several improvements were made to usability when plotting and indexing.

User changes

  • AxesTuple array now support operations via ArrayTuple #414

  • Support sum and bh.rebin without slice #424

  • Nicer error messages in some cases #415

  • Made a few properties hidden for accumulators that were not public #418

  • Boolean now supports reduction, faster compile #422

  • AxesTuple now available publicly for subprojects #419

Bug fixes

  • Histograms support operations with arrays, no longer take the first element only #417

Version 0.9

Version 0.9.0

This version was released just before PyHEP 2020. Several important fixes were made, along with a few new features to better support downstream projects.

User changes

  • metadata supported and propagated on Histograms (slots added) #403

  • Added dd=True option in to_numpy #406

  • Deprecated cpp module removed #402

Developer changes

  • Subclasses can override axes generation #401

  • [dev] extra now installs pytest #401

Bug fixes

  • Fix numpy.histogramdd return structure #406

  • Travis deploy multi-arch fixes #399

  • Selecting on a bool axes supports 2D+ histograms #398

  • Warnings fixed on NumPy 1.19+ [#404][]

Version 0.8

Version 0.8.0

This version was released just before SciPy 2020 and Boost 1.74. Highlights include better accumulator views, simpler summing, better NumPy and Pandas compatibility, and sums on growing axes. Lots of backend work, including a new wheel building system, internal changes and better reliance on Boost.Histogram’s C++ tools for actions like cropping.

User changes

  • Weighted histogram cells can now be assigned directly from iterables #375

  • Weighted views can be summed and added #368

  • Sum is now identical to the built-in sum function #365

  • Adding growing axis is better supported #358

  • Slicing an AxesTuple now keeps the type #384

  • ndim replaces rank for NumPy compatibility #385

  • Any array-like supported in fill #391, any iterable can be used for Categories #392

  • Added Boolean axes, from Boost.Histogram 1.74 #390

  • Division between histograms is supported #393

  • More deprecated functionality removed

Bug fixes

  • Support older versions of CloudPickle (issue also fixed upstream) #343

  • Drop extra printout #338

  • Throw an error instead of returning an incorrect result in more places #386

Developer changes

  • Update Boost to 1.73 #359, pybind11 to 2.5.0 #351, Boost.Histogram to pre-1.74 #388

  • Cropping no longer uses workaround #373

  • Many more checks added to pre-commit #366

  • Deprecating cpp interface #391

  • Wheelbuilding migrated to cibuildwheel and GHA #361

Version 0.7

Version 0.7.0

This version removes deprecated functionality, and has several backend improvements. The most noticeable user-facing change is the multithreaded fill feature, which can enable significant speedups when you have a dataset that is much larger than the number of bins in your histogram and have free cores to use. Several small bugs have been fixed.

User changes

  • Added threads= keyword to .fill and NumPy functions; 0 for automatic, default is 1 #325

  • .metadata is now settable directly from the AxesTuple #303

  • Deprecated items from 0.5.x now dropped #301

  • cpp mode updates and fixes #317

Bug fixes

  • Dict indexing is now identical to positional indexing, fixes “picking” axes in dict #320

  • Passing samples=None is now always allowed in .fill #325

Developer changes

  • Build system update, higher requirements for developers (only) #314

    • Version is now obtained from setuptools_scm, no longer stored in repo

  • Removed futures requirement for Python 2 tests

  • Updated Boost.Histogram, cleaner code with fewer workarounds

Version 0.6

Version 0.6.2

Common analysis tasks are now better supported. Much more complete documentation. Now using development branch of Boost.Histogram again.

Bug fixes

  • Fix sum over category axes in indexing #298

  • Allow single category item selection #298

  • Allow slicing on axes without flow bins #288, #300

  • Sum repr no longer throws error #293

Developer changes

  • Now using scikit-hep/azure-wheel-helpers via subtree #292

Version 0.6.1

Examples and notebooks are now up to date with the current state of the library. Using Boost 1.72 release.

User changes

  • Slices and single values can be mixed in indexing #279

  • UHI locators supported on axes #280

Bug fixes

  • Properties on accumulator views now resolve correctly #273

  • Division of a histogram by a number is supported again #278

  • Setting a histogram with length one slice fixed #279

  • NumPy functions now work with NumPy ints in bins= #282

  • In-place addition avoids a copy #284

Version 0.6.0

This version fills out most of the remaining features missing from the 0.5.x series. You can now use all the storages without the original caveats; even the accumulators can be accessed array-at-a-time without copy, pickled quickly, and set array-at-a-time, as well.

The API has changed considerably, providing a more consistent experience in Python. Most of the classic API still works in this release, but will issue a warning and will be removed from the next release. Please use this release to transition existing 0.5.x code to the new API.

User changes

  • Histogram and Axis classes now follow PEP 8 naming scheme (histogram->Histogram, regular->Regular, int->Int64 etc.) #192, #255

  • You can now view a histogram with accumulators, with property access such as h.view().value #194

  • Circular variable and integer axes added #231

  • Split Category into StrCategory and IntCategory, now allows empty categories when growth=True #221

  • StrCategory fills are safer and faster #239, #244

  • Added axes transforms #192

  • Function(forward, inverse) transform added, allowing ultra-fast C function pointer transforms #231

  • You can now set histogram contents directly #250

  • You can now sum over a range with endpoints #185

  • h.axes now has the functions from axis as well. #183

  • bh.project has become bh.sum #185

  • .reduce(...) and the reducers in bh.algorithm have been removed in favor of dictionary based UHI slicing #259

  • bh.numpy module interface updates, histogram=bh.Histogram replaces cryptic bh=True, and density=True is now supported in NumPy mode #256

  • Added hist.copy() #218 and hist.shape #264

  • Signatures are much nicer in Python 3 #188

  • Reprs are better, various properties like __module__ are now set correctly #200

Bug fixes

  • Unlimited and AtomicInt storages now allow single item access #194

  • .view() now no longer makes a copy #194

  • Fixes related to string category axis fills #233, #230

  • Axes are no longer copies, support setting metadata #238, #246

  • Pickling accumulator storages is now comparable in performance simple storages #258

Developer changes

  • The linux wheels are now 10-20x smaller #229

  • The hist/axis classes are now pure Python, with a C++ object inside #183

  • Most internal names changed, core->_core, etc. #183

  • The uhi module is now tag. #183

  • boost_histogram.cpp as bh provides C++ high-compatibility mode. #183

  • Indexing tags now use full UHI instead of workarounds #185

  • Removed log and sqrt special axes types#231

  • Family and registration added, new casting system #200

Version 0.5

Version 0.5.2

User changes:

  • bh.loc supports an offset #164

  • Nicer reprs in several places #167

  • Deprecate .at and .axis #170

Bug fixes:

  • Use relative paths in setup.py to avoid resolving WSL paths on Windows #162, #163

  • Better pybind11 support for Python 3.8 #168

Developer changes:

  • Serialization code shared with Boost.Histogram #166

  • Avoid unused PEP 517 isolation for now #171 (may return with proper PEP 518 support eventually)

Version 0.5.1

User changes:

  • Removed the bh.indexed/h.indexed iterator #150

  • Added .axes AxisTuple, with direct access to properties #150

  • Cleaned up tab completion in IPython #150

Bug fixes:

  • Fixed a bug in the sdist missing Boost.Variant2 #154

  • Fixed filling on strided inputs #158

Version 0.5.0

First beta release and beginning of the changelog.

Known issues:

  • Unlimited storage does not support pickling or classic multiprocessing

  • Some non-simple storages do not support some forms of access, like .view

  • Indexing and the array versions (such as centers) are incomplete and subject to change

  • The numpy module is provisional and subject to change

  • Docstrings and signatures will improve in later versions (especially on Python 3)