Arkouda v2026.02.27

Supported environments and dependencies

This release was tested in CI with the following language versions:

• Python: 3.10, 3.11, 3.12, 3.13
• Chapel: 2.4.0, 2.5.0, 2.6.0, 2.7.0

What's Changed

• Modernized CI: added Chapel 2.7, removed Chapel 2.4, reduced
  multi-dim testing scope, lowered CI RAM usage, and temporarily
  disabled Codecov. (#5358, #5387, #5389)

• Expanded NumPy alignment test coverage across utils, numeric, char,
  sorting, strings, generator, random, pdarray modules, segarray,
  dtypes, and related functionality. (#5292, #5245, #5242, #5285,
  #5287, #5297, #5294, #5272, #5278, #5252, #5258, #5261, #5255,
  #5269)

• Improved NumPy API consistency: aligned round, zeros/ones/full,
  added divide-by-zero warnings and regression fix, expanded in1d
  overloads, improved linspace, added ufunc interface and additional
  dunder operators. (#5415, #5175, #5380, #5382)

• Strengthened pandas ExtensionArray integration: enabled dtype=ak,
  expanded Series and Index accessors (groupby, argsort, apply,
  locate), improved value_counts, comparison methods, astype handling,
  and GroupBy reductions. (#5303, #5336, #5404, #5406, #5424, #5426,
  #5371, #5141, #5219, #5421, #5417, #5394)

• Fixed multiple pandas interop bugs involving index conversion and
  dtype handling, including RangeIndex issues and ak.bigint behavior.
  (#5410, #5419, #5428, #5413)

• Added ndarray return support for isna/isnull (including Categorical)
  and expanded ExtensionArray inherited method tests. (#5392, #5395,
  #5096)

• Performance improvements: bigint array transfer, CSV string reads,
  flatten benchmark improvements, benchmark v2 fixes, and updated
  benchmarks to use numNodes. (#5330, #5397, #5360, #5400)

• Added arkouda.core module and introduced deprecation warnings for
  old module structure. (#5366, #5362)

• Miscellaneous fixes including reverting balancedSegStringRetrieval
  and test/docstring fixes. (#5089, #5298, #5402)

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Full Changelog

v2026.02.02...v2026.02.27

Auto-generated release notes

What's Changed

• temporariy remove arkouda_multi-dim_test_coverage by @ajpotts in #5383
• Closes #5358: add Chapel 2.7 to the CI by @ajpotts in #5359
• Closes #5387: remove chapel 2.4 from the CI by @ajpotts in #5388
• Closes #5389: Reduce multi-dim testing to latest chapel version by @ajpotts in #5390
• Closes #5382: pdarray.invert and .abs by @ajpotts in #5384
• Attempts to reduce the compilation RAM for the multidim tests in the CI by @ajpotts in #5391
• Closes #5330: Improve ak.array Bigint array transfer performance by @1RyanK in #5334
• Adds special cases to ak.linspace by @drculhane in #5378
• Closes #5175: overloads for in1d by @1RyanK in #5341
• Closes #5292: alignment tests for arkouda.numpy.utils by @ajpotts in #5293
• Part 2 of #5096: unit tests for inherited functions in arkouda extension array by @ajpotts in #5342
• Closes #5362: Deprecation warnings to old module structure by @ajpotts in #5363
• makes sure docs folder exists in docstr-coverage by @ajpotts in #5385
• Aligns round function to numpy, adds unit tests by @drculhane in #5396
• Improve string reads from CSV files by @e-kayrakli in #5397
• Fixes bug 5298, so that generator.integers gives an error if asked for float by @drculhane in #5377
• Temporarily disable codecov by @ajpotts in #5398
• Closes #5219: improve astype in ak.pandas.extension by @ajpotts in #5222
• Aligns zeros and ones to numpy, adds and/or fixes overloads to zeros, ones, full by @drculhane in #5376
• Improve flatten benchmark by @ajpotts in #5360
• Closes #5096: unit tests for inherited functions in arkouda extension array by @ajpotts in #5102
• Closes #5245: alignment tests for arkouda.numpy.numeric by @ajpotts in #5251
• Closes #5303: Pandas ExtensionArray: allow dtype=ak for generic Arkouda-backed arrays by @ajpotts in #5304
• Closes #5242: alignment tests for arkouda.numpy.char by @ajpotts in #5244
• Closes #5285: alignment tests for arkouda.numpy.sorting by @ajpotts in #5286
• Closes #5392 and #5392: pandas extension update: adding ndarray return to the isna and isnull functions by @jaketrookman in #5337
• Closes #5287: alignment tests for arkouda.numpy.strings by @ajpotts in #5291
• Adds runtime warning on divide-by-zero. by @drculhane in #5315
• Closes #5380 add python dunder operator methods to arkouda array by @ajpotts in #5381
• More benchmark v2 fixes by @jabraham17 in #5400
• Creates interface for ufunc functions by @drculhane in #5399
• Closes #5373: where to allow bool_scalars by @ajpotts in #5374
• Closes #5336: ArkoudaExtensionArray.value_counts by @ajpotts in #5338
• Fix: #5402: make check-arrow fails with command not found by @ajpotts in #5403
• Closes #5366: arkouda.core module by @ajpotts in #5367
• Closes #5297: alignment tests for arkouda.numpy.generator by @ajpotts in #5299
• Closes #5294: alignment tests for arkouda.numpy.random.legacy by @ajpotts in #5296
• Closes #5406: Series accessor groupby by @ajpotts in #5407
• Closes #5404: ArkoudaExtensionArray._cmp_method by @ajpotts in #5405
• Closes #5272: alignment tests for arkouda.numpy.pdarraysetops by @ajpotts in #5274
• Closes #5278: alignment tests for arkouda.numpy.segarray by @ajpotts in #5284
• Closes #5252: alignment tests for arkouda.numpy.dtypes by @ajpotts in #5254
• Closes #5089: Add a balancedSegStringRetrieval function by @1RyanK in #5090
• Closes #5410: Bug: Arkouda-backed Series creates NumPy RangeIndex by @ajpotts in #5411
• Closes #5258 alignment tests for arkouda.numpy.pdarrayclass by @ajpotts in #5260
• Closes #5261: alignment tests for arkouda.numpy.pdarraycreation by @ajpotts in #5268
• Closes #5255: alignment tests for arkouda.numpy.err by @ajpotts in #5256
• Closes #5269: alignment tests for arkouda.numpy.pdarraymanipulation by @ajpotts in #5270
• Use numNodes instead of numLocales in benchmarks by @e-kayrakli in #5022
• Closes #5371: Add locate and from_return_msg to pd Series accessor by @ajpotts in #5372
• Closes #5415: Performance regresion from divide by zero check by @ajpotts in #5416
• Closes #5413: bug in pd.array when dtype is ak.bigint by @ajpotts in #5414
• Closes #5419: Bug: DataFrame.ak.to_ak() Does Not Convert Index to Arkouda-Backed Index by @ajpotts in #5420
• Closes #5417: Rename ArkoudaCategoricalArray to ArkoudaCategorical by @ajpotts in #5418
• Closes #5421: Support pandas Series and ArkoudaExtensionArray in GroupBy Reductions by @ajpotts in #5422
• Closes #5424: argsort to Series accessor by @ajpotts in #5425
• Closes #5426: apply to Series accessor by @ajpotts in #5427
• Closes #5141: Index pandas extension accessor add from_return_msg and other functions by @ajpotts in #5205
• Closes #5428: BUG: Pandas Series with dtype=ak Returns NumPy Index Values by @ajpotts in #5435
• _from_factorized to call _from_sequence by @ajpotts in #5436
• Revert "Closes #5089: Add a balancedSegStringRetrieval function" by @ajpotts in #5438
• fixes import statement in test_dataframe_docstrings by @ajpotts in #5439
• Closes #5394 and #5395: pandas extension update: adding ndarray return to isna and isnull to Categoical Extension Array by @jaketrookman in #5440

Full Changelog: v2026.02.02...v2026.02.27