Holoviews

**May 9, 2023**

This release includes many new features, improvements, and bug fixes. Among the highlights are support for Bokeh 3.1 and Panel 1.0, both of which come with a wide range of new features and enhancements. Time series support has also been improved, with auto-ranging along one axis, a new downsample algorithm, and having WebGL enabled by default. In addition, the release includes various other enhancements and bug fixes.

We would like to thank the many users who contributed to this release by filing bug reports, providing new features, and bug fixes. We want to give a special shout-out to existing contributors ianthomas23, jlstevens, jordansamuels, maximlt, philippjfr, TheoMathurin, Yura52, and Hoxbro, as well as new contributors GeoVizNow, JRRudy1, keewis, michaelaye, and wendrul.

This minor version will be the last to support Python 3.7. The next minor version will require Python 3.8 or higher.
In the next release, `holoviews.annotate` will start giving a deprecation warning about its future move to the new package [HoloNote](https://github.com/holoviz/holonote).

New features:

- Support for Bokeh 3.1 and Panel 1.0 ([5388](https://github.com/holoviz/holoviews/pull/5388), [#5620](https://github.com/holoviz/holoviews/pull/5620), [#5640](https://github.com/holoviz/holoviews/pull/5640), [#5679](https://github.com/holoviz/holoviews/pull/5679), [#5683](https://github.com/holoviz/holoviews/pull/5683), [#5692](https://github.com/holoviz/holoviews/pull/5692), [#5703](https://github.com/holoviz/holoviews/pull/5703))
- Implement auto-ranging support along one axis ([5554](https://github.com/holoviz/holoviews/pull/5554), [#5609](https://github.com/holoviz/holoviews/pull/5609))
- Add Largest Triangle Three Buckets (LTTB) as a downsample algorithm ([5552](https://github.com/holoviz/holoviews/pull/5552))
- Enable WebGL by default ([5708](https://github.com/holoviz/holoviews/pull/5708))

Enhancements:

- Improve `legend_cols` support for Bokeh 3 ([5669](https://github.com/holoviz/holoviews/pull/5669))
- Add convenience `getter` interface to `opts` ([5606](https://github.com/holoviz/holoviews/pull/5606))
- Ensure `.stack` works on areas with different `vdims` ([5693](https://github.com/holoviz/holoviews/pull/5693))
- Add `muted` support to `PointPlot` like `hv.Scatter` ([5705](https://github.com/holoviz/holoviews/pull/5705))
- Automatic detect `comms` without calling `pn.extension()` ([5645](https://github.com/holoviz/holoviews/pull/5645))
- Add support for extra `Hovertool` variables in a Bokeh's `quadmesh` with 2D coordinates (with tests) ([5638](https://github.com/holoviz/holoviews/pull/5638))
- Change `hv.Rectangles` to internally use Bokeh `Quad` and not `Rect` to support logarithmic axis in WebGL ([5664](https://github.com/holoviz/holoviews/pull/5664), [#5702](https://github.com/holoviz/holoviews/pull/5702))

Bug fixes:

- Ensure `spatial_select` in non-zero indexed DataFrame is applied right ([5625](https://github.com/holoviz/holoviews/pull/5625))
- Fix error handling for plotting class lookups on empty `DynamicMap`/`HoloMap` ([5604](https://github.com/holoviz/holoviews/pull/5604))
- Fix `active_tools` to only be set for enabled tools ([5616](https://github.com/holoviz/holoviews/pull/5616))
- Fix legend display when using categorical `datashade` on GPU ([5631](https://github.com/holoviz/holoviews/pull/5631))
- Adding `GeoDataFrame` to `DataConversion` ([5325](https://github.com/holoviz/holoviews/pull/5325))
- Don't emit warnings when the toolbar is disabled ([5691](https://github.com/holoviz/holoviews/pull/5691))
- Don't try to find the closest match if the input is empty ([5700](https://github.com/holoviz/holoviews/pull/5700))
- Only use `long_name` if it is a string ([5646](https://github.com/holoviz/holoviews/pull/5646))
- Use Matplotlib's public API to list the colormaps ([5598](https://github.com/holoviz/holoviews/pull/5598))

Compatibility:

- Add Param 2.0 support ([5667](https://github.com/holoviz/holoviews/pull/5667), [#5641](https://github.com/holoviz/holoviews/pull/5641), [#5680](https://github.com/holoviz/holoviews/pull/5680), [#5704](https://github.com/holoviz/holoviews/pull/5704))
- Add Pandas 2.0 support ([5662](https://github.com/holoviz/holoviews/pull/5662))
- Update `types.functiontype` to `collections.abc.callable` ([5636](https://github.com/holoviz/holoviews/pull/5636))
- Improve error message for categorical data when used with `datashade` ([5643](https://github.com/holoviz/holoviews/pull/5643))
- Don't disable Jedi completion by default ([5701](https://github.com/holoviz/holoviews/pull/5701))

Documentation:

- Fix an incorrect number stated regarding available axis types ([5623](https://github.com/holoviz/holoviews/pull/5623))
- Fix `BoundsY` example ([5629](https://github.com/holoviz/holoviews/pull/5629))
- Fix formatting on FAQ ([5630](https://github.com/holoviz/holoviews/pull/5630))
- Fix anchor links ([5677](https://github.com/holoviz/holoviews/pull/5677))

Maintenance:

- Use `clean-notebook`, `codespell`, and `ruff` in `pre-commit` ([5594](https://github.com/holoviz/holoviews/pull/5594), [#5627](https://github.com/holoviz/holoviews/pull/5627), [#5653](https://github.com/holoviz/holoviews/pull/5653))
- General maintenance ([5607](https://github.com/holoviz/holoviews/pull/5607), [#5611](https://github.com/holoviz/holoviews/pull/5611), [#5612](https://github.com/holoviz/holoviews/pull/5612), [#5649](https://github.com/holoviz/holoviews/pull/5649))

Known issues:

- `BoxEditTool` is not yet supported with the new internals of `hv.Rectangle`.

Removals:

- Raise `DataError` for non-string column names in DataFrame ([5654](https://github.com/holoviz/holoviews/pull/5654))
- Remove deprecated tile sources ([5654](https://github.com/holoviz/holoviews/pull/5654))
- Removed support for `apply_groups` for old option groups signature ([5497](https://github.com/holoviz/holoviews/pull/5497))

**January 16, 2023**

This release contains a small number of enhancements and important bug fixes.
Many thanks to our new contributors mmorys, jj-github-jj, and sandhujasmine, but also our returning contributors droumis, jlstevens, MarcSkovMadsen, maximlt, philippjfr, stanwest, and Hoxbro.

Enhancements:

- Make lasso select mask values using a Dask-compatible method ([5568](https://github.com/holoviz/holoviews/pull/5568))
- Make plotly legend group unique ([5570](https://github.com/holoviz/holoviews/pull/5570))
- Set pan and wheel_zoom as the default Bokeh active tools ([5480](https://github.com/holoviz/holoviews/pull/5480))
- Enable rendering colorbars on bokeh `GraphPlot`s ([5585](https://github.com/holoviz/holoviews/pull/5585))
- Add Plotly `Scatter3d` documentation and fix colorbar title ([5418](https://github.com/holoviz/holoviews/pull/5418))

Bug fixes:

- Only trigger range-update once in callbacks ([5558](https://github.com/holoviz/holoviews/pull/5558))
- Ensure dynamically created subplots can be updated ([5555](https://github.com/holoviz/holoviews/pull/5555))
- Fix start of stack-level in deprecations ([5569](https://github.com/holoviz/holoviews/pull/5569))
- When sorting colormap records, replace None with an empty string ([5539](https://github.com/holoviz/holoviews/pull/5539))
- Fix annotator in Geoviews by adding deserialization of non-deserialized base64 data ([5587](https://github.com/holoviz/holoviews/pull/5587))
- Fix `hv.Empty` not working in `AdjointLayout` plot ([5584](https://github.com/holoviz/holoviews/pull/5584))
- Check for categorical data to histogram ([5540](https://github.com/holoviz/holoviews/pull/5540))
- Fix `clim_percentile` ([5495](https://github.com/holoviz/holoviews/pull/5495))

Compatibility:

- Compatibility with Shapely 2.0 ([5561](https://github.com/holoviz/holoviews/pull/5561))
- Compatibility with Numpy 1.24 ([5581](https://github.com/holoviz/holoviews/pull/5581))
- Compatibility with Ibis 4.0 ([5588](https://github.com/holoviz/holoviews/pull/5588))

Documentation:

- Installation instructions update ([5562](https://github.com/holoviz/holoviews/pull/5562))
- Use OSM for reference tile source in notebook documentation ([5536](https://github.com/holoviz/holoviews/pull/5536))
- Enhance Tiles example notebook ([5563](https://github.com/holoviz/holoviews/pull/5563))

Maintenance:

- Various fixes and general maintenance of the CI ([5384](https://github.com/holoviz/holoviews/pull/5384), [#5573](https://github.com/holoviz/holoviews/pull/5573), [#5576](https://github.com/holoviz/holoviews/pull/5576), [#5582](https://github.com/holoviz/holoviews/pull/5582))
- Updated codebase to modern Python conventions ([5509](https://github.com/holoviz/holoviews/pull/5509), [#5577](https://github.com/holoviz/holoviews/pull/5577))
- Renamed `master` branch to `main` ([5579](https://github.com/holoviz/holoviews/pull/5579))
- Update binder link and dependency pinning ([5583](https://github.com/holoviz/holoviews/pull/5583))
- Update copyright to only contain start year ([5580](https://github.com/holoviz/holoviews/pull/5580))

**December 6, 2022**

This release contains a small number of important bug fixes and
adds support for Python 3.11. Many thanks to our maintainers
Hoxbro, maximlt and jlstevens.

Bug Fixes:

- Fix for empty opts warning and incorrect clearing semantics
([5496](https://github.com/holoviz/holoviews/pull/5496))
- Fix potential race condition in the Options system
([5535](https://github.com/holoviz/holoviews/pull/5535))

Enhancements:

- Add support to Python 3.11
([5513](https://github.com/holoviz/holoviews/pull/5513))
- Cleanup the top `__init__` module
([5516](https://github.com/holoviz/holoviews/pull/5516))

Documentation:

- Fixes to release notes and CHANGELOG
([5506](https://github.com/holoviz/holoviews/pull/5506))

**November 3, 2022**

This release contains a small number of important bug fixes. Many thanks
to stanwest for his contribution and thank you to our maintainers
Hoxbro, maximlt, jlstevens, jbednar, and philippjfr.

Bug fixes:

- Fix support for jupyterlite
([5502](https://github.com/holoviz/holoviews/pull/5502))
- Improve error message for `hv.opts` without a plotting backend
([5494](https://github.com/holoviz/holoviews/pull/5494))
- Fix warnings exposed in CI logs
([5470](https://github.com/holoviz/holoviews/pull/5470))
- Thanks to maximlt for various CI fixes
([5484](https://github.com/holoviz/holoviews/pull/5484),
[5498](https://github.com/holoviz/holoviews/pull/5498),
[5485](https://github.com/holoviz/holoviews/pull/5485))

Enhancement:

- Allow Dimension objects to accept a dictionary specification
([5333](https://github.com/holoviz/holoviews/pull/5333))
- Refactor to remove iterrows for loop from `connect_edges_pd`
([5473](https://github.com/holoviz/holoviews/pull/5473))

Deprecations:

Promoted `DeprecationWarning` to `FutureWarning` when using pandas
`DataFrame`s with non-string column names. This will not change any
functionality but will start warning users about functionality that will
be deprecated in future.

- Upgrade warning for invalid dataframe column names
([5472](https://github.com/holoviz/holoviews/pull/5472))

**October 4, 2022**

This release contains a small number of important bug fixes. Many thanks
to all our new contributors MarcSkovMadsen, j-svensmark, ceball,
droumis, ddrinka, Jhsmit and stanwest as well as a special thanks to
Hoxbro for his many bug fixes. An additional thank you goes out to
maximlt, philippjfr, jbednar and jlstevens.

Enhancements:

- Sort output of `decimate` operation so that it can be used with connected Elements
(Curve, Area, etc.) ([5452](https://github.com/holoviz/holoviews/pull/5452))
- Ensure HoloViews is importable from a pyodide webworker
([5410](https://github.com/holoviz/holoviews/pull/5410))
- Add support for stepwise Area plots
([5390](https://github.com/holoviz/holoviews/pull/5390))
- Better error message for `hv.Cycle` when incompatible backend activated
([5379](https://github.com/holoviz/holoviews/pull/5379))
- Improvements to VSCode notebook support
([5398](https://github.com/holoviz/holoviews/pull/5398))
- Protect matplotlib tests from global styles
([5311](https://github.com/holoviz/holoviews/pull/5311))
- Faster hashing for arrays and pandas objects
([5455](https://github.com/holoviz/holoviews/pull/5455))
- Add pre-commit hooks to CI actions and fixes to pytest configuration
([5385](https://github.com/holoviz/holoviews/pull/5385),
[5440](https://github.com/holoviz/holoviews/pull/5440))

Bug Fixes:

- Allow import of numpy 1.12
([5367](https://github.com/holoviz/holoviews/pull/5367))
- Fixes handling of iterables in Overlays
([5320](https://github.com/holoviz/holoviews/pull/5320))
- Always return a string when using `hv.Dimension.pprint_value`
([5383](https://github.com/holoviz/holoviews/pull/5383))
- Support widgets in slices for `loc` and `iloc`
([5352](https://github.com/holoviz/holoviews/pull/5352))
- Take account of labeled dimension in Bokeh plotting classes
([5404](https://github.com/holoviz/holoviews/pull/5404))
- Fix handling of pandas `Period` ranges
([5393](https://github.com/holoviz/holoviews/pull/5393))
- Fixed declaration of `Scatter` to `Selection1DExpr`
([5413](https://github.com/holoviz/holoviews/pull/5413))
- Ensure rangesupdate event fires on all plots with linked axes
([5465](https://github.com/holoviz/holoviews/pull/5465))
- Fixed fallback to shapely spatial select
([5468](https://github.com/holoviz/holoviews/pull/5468))
- Many thanks to Hoxbro for many miscellaneous plotting fixes,
including fixes to plotting of `BoxWhisker`, `VectorField` elements
([5397](https://github.com/holoviz/holoviews/pull/5397),
[5450](https://github.com/holoviz/holoviews/pull/5450),
[5400](https://github.com/holoviz/holoviews/pull/5400),
[5409](https://github.com/holoviz/holoviews/pull/5409),
[5460](https://github.com/holoviz/holoviews/pull/5460)))
- Fixes to documentation building GitHub Action
([5320](https://github.com/holoviz/holoviews/pull/5456),
([5320](https://github.com/holoviz/holoviews/pull/5467)))

Documentation:

- Introduced module documentation
([5362](https://github.com/holoviz/holoviews/pull/5362))
- Remove Python 2 references from README
([5365](https://github.com/holoviz/holoviews/pull/5365))
- Update call to panel add_periodic_callback in Bokeh gallery example
([5436](https://github.com/holoviz/holoviews/pull/5436))
- Added reference to example in `RangeToolLink`
([5435](https://github.com/holoviz/holoviews/pull/5435))

API:

In future, HoloViews will not allow non-string values for pandas
DataFrame column names. This deprecation cycle starts by
issuing a `DeprecationWarning` that should not be visible to users.

- Issue DeprecationWarning for invalid DataFrame column types
([5457](https://github.com/holoviz/holoviews/pull/5457))