Holoviews

**June 13, 2024**

This release introduces a number of major new features and enhancements, including the ability to add popups to your Bokeh figures, which allows you to drill down into subsets of your data easily.
Additionally, this release retains and uses pandas (multi-)indexes without unnecessary copies, providing significant benefits for working with wide data.
A major focus of this release has also been to improve the time it takes to plot large datasets, both by updating the data pipeline and reducing the amount of data send to the browser.
Furthermore, we have improved the developer experience, making it easier to contribute to HoloViews, see the [developer guide](https://holoviews.org/developer_guide/index.html).
Lastly bugs have been squashed and enhancements made to the existing features.

Thank you to mirage007 and WesleyTheGeolien for their first contributions and to the returning contributors douglas-raillard-arm, jj-github-jj, and TheoMathurin.
Another thanks to the maintainers ahuang11, droumis, maximlt, philippjfr, and hoxbro.

New features:

- Add support for popups on selection streams ([6168](https://github.com/holoviz/holoviews/pull/6168), [#6207](https://github.com/holoviz/holoviews/pull/6207), [#6199](https://github.com/holoviz/holoviews/pull/6199))
- Add scalebar support ([6002](https://github.com/holoviz/holoviews/pull/6002))

Enhancements:

- Override Curve's count aggregator default to `self_intersect=False` ([6030](https://github.com/holoviz/holoviews/pull/6030))
- Zoom tools automatically vertically scaled on `subcoordinate_y` overlays ([6051](https://github.com/holoviz/holoviews/pull/6051))
- Use `tsdownsample` library for downsampling if available ([6059](https://github.com/holoviz/holoviews/pull/6059), [#6083](https://github.com/holoviz/holoviews/pull/6083))
- Add viewport downsample algorithm ([6017](https://github.com/holoviz/holoviews/pull/6017))
- Optimize `downsample1d` when data is shared between layers ([6075](https://github.com/holoviz/holoviews/pull/6075))
- Support dictionary cmaps for `ImageStack` ([6025](https://github.com/holoviz/holoviews/pull/6025))
- Expose `hit_dilation` in `PointPlot` ([6121](https://github.com/holoviz/holoviews/pull/6121))
- Improve autocompletion for lazy module ([6174](https://github.com/holoviz/holoviews/pull/6174))
- `Subcoordinate_y`: reverse the renderers by default ([6194](https://github.com/holoviz/holoviews/pull/6194))
- Add `hover_tooltips`, `hover_mode`, `hover_formatters` opts to easily modify hover ([6180](https://github.com/holoviz/holoviews/pull/6180))
- Expose setting hard navigable bounds ([6056](https://github.com/holoviz/holoviews/pull/6056))
- Add a zoom tool per `subcoordinate_y` group ([6122](https://github.com/holoviz/holoviews/pull/6122))
- Support all Bokeh Text style opts in `hv.Labels` and `hv.Text` ([6198](https://github.com/holoviz/holoviews/pull/6198))
- Implement support for retaining `Pandas` index ([6061](https://github.com/holoviz/holoviews/pull/6061))
- Add operation for group-wise normalisation ([6124](https://github.com/holoviz/holoviews/pull/6124))
- Allow Bars to be plotted on continuous axes ([6145](https://github.com/holoviz/holoviews/pull/6145))
- Add `min_interval` and `max_interval` to the `RangeToolLink` ([6134](https://github.com/holoviz/holoviews/pull/6134))
- Add support for rasterizing `geopandas` dataframes directly ([5958](https://github.com/holoviz/holoviews/pull/5958))
- Allow options for non-enabled backends ([6196](https://github.com/holoviz/holoviews/pull/6196))
- Support `ImageStack` in dynspread ([6024](https://github.com/holoviz/holoviews/pull/6024))
- Add support for `cticks` ([6257](https://github.com/holoviz/holoviews/pull/6257))
- Support title font size in Plotly backend ([5920](https://github.com/holoviz/holoviews/pull/5920))
- Hold rendering until a plot has been fully updated ([6265](https://github.com/holoviz/holoviews/pull/6265))
- Make `Dimension.label` source of truth for Dimension identity ([6262](https://github.com/holoviz/holoviews/pull/6262))
- Allow subcoordinates to be drawn from NdOverlay dimensions ([6209](https://github.com/holoviz/holoviews/pull/6209))
- Add stream transform ([6230](https://github.com/holoviz/holoviews/pull/6230))

Bug fixes:

- Don't show figures toolbar on `GridSpace` ([6127](https://github.com/holoviz/holoviews/pull/6127))
- Update merge_tool ([6141](https://github.com/holoviz/holoviews/pull/6141))
- Don't raise `KeyError` if options don't contain None ([6153](https://github.com/holoviz/holoviews/pull/6153))
- Force vdims to strings for `ImageStack` ([6155](https://github.com/holoviz/holoviews/pull/6155))
- Fixes to Bokeh `BoxWhisker` ([6169](https://github.com/holoviz/holoviews/pull/6169))
- Improve groupby behavior for operation `histogram` ([6172](https://github.com/holoviz/holoviews/pull/6172))
- Ensure plot ranges for all renderers are combined in auto-ranging ([6173](https://github.com/holoviz/holoviews/pull/6173))
- Ensure that the downsample algorithm `m4` n_out is always a multiple of 4 ([6195](https://github.com/holoviz/holoviews/pull/6195))
- Subcoordinate_y: respect `ylim` ([6190](https://github.com/holoviz/holoviews/pull/6190))
- Bug fix for player example pause button ([6212](https://github.com/holoviz/holoviews/pull/6212))
- Clone if a Tool is as Bokeh model ([6220](https://github.com/holoviz/holoviews/pull/6220))
- Fix violin plot in `Plotly` ([6237](https://github.com/holoviz/holoviews/pull/6237))
- Don't error on `TypeError` in `DaskInterface` when sorting ([6221](https://github.com/holoviz/holoviews/pull/6221))
- Fix `hv.help` if `Info.store` is `None` ([6250](https://github.com/holoviz/holoviews/pull/6250))
- Change how upper limit is taken for `color_levels` ([4898](https://github.com/holoviz/holoviews/pull/4898))
- Fix vectorfield hover ([6258](https://github.com/holoviz/holoviews/pull/6258))
- Ensure Range streams and `RangeToolLink` respect subcoordinate axis range ([6256](https://github.com/holoviz/holoviews/pull/6256))
- Fix pickling state ([6245](https://github.com/holoviz/holoviews/pull/6245))
- Fix colab rendering ([6269](https://github.com/holoviz/holoviews/pull/6269))
- Disable batching when `subcoordinate_y` is enabled ([6272](https://github.com/holoviz/holoviews/pull/6272))
- Ensure downsample works with non-contiguous arrays ([6271](https://github.com/holoviz/holoviews/pull/6271))
- Fix issue with range lookups in (y)-axis creation ([6274](https://github.com/holoviz/holoviews/pull/6274))

Dependencies updates:

- Update `param` minimum version to 2.0 ([6230](https://github.com/holoviz/holoviews/pull/6230))
- Update `numpy >=1.21`, `pandas >= 1.3`, and `Bokeh >=3.1` ([6253](https://github.com/holoviz/holoviews/pull/6253))

Compatibility:

- Update test for Bokeh 3.4 ([6130](https://github.com/holoviz/holoviews/pull/6130))
- Test with dask-expr ([6259](https://github.com/holoviz/holoviews/pull/6259), [#6149](https://github.com/holoviz/holoviews/pull/6149))
- Numpy 2.0 compatibility ([6238](https://github.com/holoviz/holoviews/pull/6238))
- Update to support cudf 2024.06 ([6263](https://github.com/holoviz/holoviews/pull/6263))

Documentation:

- Minor typos ([6179](https://github.com/holoviz/holoviews/pull/6179), [#6193](https://github.com/holoviz/holoviews/pull/6193))
- Update CSS for documentation ([6228](https://github.com/holoviz/holoviews/pull/6228))
- Fix links ([6246](https://github.com/holoviz/holoviews/pull/6246), [#6036](https://github.com/holoviz/holoviews/pull/6036))
- Document `subcoordinate_group_ranges` by extending the EEG Viewer demo ([6243](https://github.com/holoviz/holoviews/pull/6243))

Maintenance:

- Switch to Pixi for development / CI and hatchling for build system ([6182](https://github.com/holoviz/holoviews/pull/6182), [#6200](https://github.com/holoviz/holoviews/pull/6200), [#6251](https://github.com/holoviz/holoviews/pull/6251))
- Add `test-gpu` task for Pixi ([6217](https://github.com/holoviz/holoviews/pull/6217))
- Add `sync-git-tags` task to Pixi for sync git tags with upstream repo ([6215](https://github.com/holoviz/holoviews/pull/6215))
- Parallelize unit test ([6234](https://github.com/holoviz/holoviews/pull/6234))
- Use `psutil` for `pytest-xdist` `logical` option ([6213](https://github.com/holoviz/holoviews/pull/6213))
- Bump CI tests to use Python 3.12 ([5978](https://github.com/holoviz/holoviews/pull/5978))
- Only run test-suite on code change ([6035](https://github.com/holoviz/holoviews/pull/6035))
- Add skip statement to all steps to work with required ([6037](https://github.com/holoviz/holoviews/pull/6037))
- Add true if inputs.cache is not set ([6050](https://github.com/holoviz/holoviews/pull/6050))
- Dynamic generate unit test matrix and add cache option ([6043](https://github.com/holoviz/holoviews/pull/6043))
- Add prettier to markdown and yaml ([6040](https://github.com/holoviz/holoviews/pull/6040))
- Add taplo as toml formatter ([6227](https://github.com/holoviz/holoviews/pull/6227))
- Disable always on warnings ([6077](https://github.com/holoviz/holoviews/pull/6077))
- Updating Package workflow to a build and a publish step ([6031](https://github.com/holoviz/holoviews/pull/6031))
- Use the new conda package format ([6216](https://github.com/holoviz/holoviews/pull/6216))

**February 12, 2024**

This micro release includes bug fixes.

Bug fixes:

- Fix BoundsX and BoundsY regression ([6099](https://github.com/holoviz/holoviews/pull/6099))
- Fix rasterize regression ([6102](https://github.com/holoviz/holoviews/pull/6102))
- Fix link selection for empty Layout ([6110](https://github.com/holoviz/holoviews/pull/6110))
- Don't pin notebook in conda recipe for pyviz channel ([6108](https://github.com/holoviz/holoviews/pull/6108))

**February 5, 2024**

This micro release includes a number of bug fixes and documentation updates, as well as compatibility updates for xarray 2023.12 and Pandas 2.2.
Many thanks to the new contributors junietoc, JulianGiles, and magic-lantern, as well as the returning contributors ianthomas23, maximlt, TheoMathurin, philippjfr, ahuang11, and Hoxbro.

Enhancements:

- Update contour line calculations to use ContourPy's `LineType.ChunkCombinedNan` ([5985](https://github.com/holoviz/holoviews/pull/5985))
- Use sys.executable for `check_output` ([5983](https://github.com/holoviz/holoviews/pull/5983))
- Updates to `show_versions` ([6072](https://github.com/holoviz/holoviews/pull/6072), [#6081](https://github.com/holoviz/holoviews/pull/6081))

Bug fixes:

- Support `color_key` in `datashade` when intermediate step is an `ImageStack` ([5994](https://github.com/holoviz/holoviews/pull/5994))
- Fix hist on overlay ([5995](https://github.com/holoviz/holoviews/pull/5995))
- Set proper context before triggering streams ([6000](https://github.com/holoviz/holoviews/pull/6000))
- Support partial bound function ([6009](https://github.com/holoviz/holoviews/pull/6009))
- Add `norm` in `init_artists` in holoviews/plotting/mpl/raster.py ([6029](https://github.com/holoviz/holoviews/pull/6029))
- Fix linking elements that are transformed by a Compositor ([6003](https://github.com/holoviz/holoviews/pull/6003))
- Add datetime hover information for selector ([6023](https://github.com/holoviz/holoviews/pull/6023), [#6039](https://github.com/holoviz/holoviews/pull/6039))
- Only evaluate `rx` if it is a Reactive Expression ([6014](https://github.com/holoviz/holoviews/pull/6014))
- Ensure partial methods can be used as dmap callables ([6063](https://github.com/holoviz/holoviews/pull/6063))
- Del frame after stack level is found in `deprecated` ([6085](https://github.com/holoviz/holoviews/pull/6085))

Compatibility:

- Compatibility updates with xarray 2023.12 ([6026](https://github.com/holoviz/holoviews/pull/6026))
- Add extra check to detect if we are in jupyterlite ([6007](https://github.com/holoviz/holoviews/pull/6007))
- Compatibility updates with Pandas 2.2 ([6074](https://github.com/holoviz/holoviews/pull/6074), [#6078](https://github.com/holoviz/holoviews/pull/6078))
- Add Comm `on_open` handler to initialize the server comm ([6076](https://github.com/holoviz/holoviews/pull/6076))

Documentation:

- Fix docs ([5996](https://github.com/holoviz/holoviews/pull/5996))
- Fix Param usage in the Plot and Renderers guide ([6001](https://github.com/holoviz/holoviews/pull/6001))
- Fixing URLs to bokeh project ([6005](https://github.com/holoviz/holoviews/pull/6005))
- Fix to broken urls in example gallery pages ([6038](https://github.com/holoviz/holoviews/pull/6038))
- Replace Google Analytics with GoatCounter ([6048](https://github.com/holoviz/holoviews/pull/6048))
- Add downloads badges ([6088](https://github.com/holoviz/holoviews/pull/6088))

Maintenance:

- Change to pytest-rerunfailures ([5984](https://github.com/holoviz/holoviews/pull/5984))
- Holoviews maintenance ([5987](https://github.com/holoviz/holoviews/pull/5987))
- Add `log_cli_level = "INFO"` to pytest ([5989](https://github.com/holoviz/holoviews/pull/5989))
- Add shell pre-commit hook ([5991](https://github.com/holoviz/holoviews/pull/5991))
- Enable Bugbear 904 ([5992](https://github.com/holoviz/holoviews/pull/5992))
- Part 1, modernize test suite ([5954](https://github.com/holoviz/holoviews/pull/5954))
- Enforce labels ([5996](https://github.com/holoviz/holoviews/pull/5997))
- Add lower pin to scipy ([6032](https://github.com/holoviz/holoviews/pull/6032))
- Skip Deploying_Bokeh_Apps.ipynb on Windows ([6070](https://github.com/holoviz/holoviews/pull/6070))
- Fix failing Windows tests ([6087](https://github.com/holoviz/holoviews/pull/6087))

**November 8, 2023**

This release contains a small number of bug fixes and compatibility updates — many thanks to philippjfr and Hoxbro for their contributions.

Bug fixes:

- Account for overlaid elements when using `subcoordinates_y` ([5950](https://github.com/holoviz/holoviews/pull/5950))
- Fix `groupby` option for vectorized annotations ([5956](https://github.com/holoviz/holoviews/pull/5956))
- Fix and improvements to `ImageStack` ([5961](https://github.com/holoviz/holoviews/pull/5961))
- Do not allow partial matches when updating `OverlayPlot` ([5962](https://github.com/holoviz/holoviews/pull/5962))
- Always ravel array in `unique_array` ([5969](https://github.com/holoviz/holoviews/pull/5969))

Compatibility:

- Update Stamen maps with new URL ([5967](https://github.com/holoviz/holoviews/pull/5967))
- Compatibility updates for Numpy 2.0 ([5979](https://github.com/holoviz/holoviews/pull/5979))

Maintenance:

- General maintenance ([5955](https://github.com/holoviz/holoviews/pull/5955))

**October 18, 2023**

This release includes new features, improvements, and bug fixes. Among these are the new elements. First is the `ImageStack` element allows you to easily visualize a 3D array, while the `VLines`, `HLines`, `VSpans`, and `HSpans` elements allow you to visualize vertical and horizontal lines and spans easily. In addition, this release includes support for subcoordinate systems in the y-axis and various other enhancements and bug fixes. This release adds support for the newest Python 3.12 and Bokeh 3.3 and drops support for Python 3.8 and Bokeh 2.

Many thanks to the new contributors MeggyCal, along with our returning contributors ahuang11, ianthomas23, jlstevens, maximlt, philippjfr, and Hoxbro.

New features:

- Implementation of `ImageStack` ([5751](https://github.com/holoviz/holoviews/pull/5751), [#5945](https://github.com/holoviz/holoviews/pull/5945))
- Adding vectorized `VLines`, `HLines`, `VSpans`, and `HSpans` elements ([5845](https://github.com/holoviz/holoviews/pull/5845), [#5911](https://github.com/holoviz/holoviews/pull/5911), [#5940](https://github.com/holoviz/holoviews/pull/5940))
- Implement support for subcoordinate systems in the y-axis ([5840](https://github.com/holoviz/holoviews/pull/5840))

Enhancements:

- Cycle through `text_color` when overlaying Labels ([5888](https://github.com/holoviz/holoviews/pull/5888))
- Drop requirements for `OrderedDict` ([5867](https://github.com/holoviz/holoviews/pull/5867), [#5890](https://github.com/holoviz/holoviews/pull/5890), [#5925](https://github.com/holoviz/holoviews/pull/5925))
- Allow to link to an `Overlay` ([5881](https://github.com/holoviz/holoviews/pull/5881))
- Use contourpy for contour calculations ([5910](https://github.com/holoviz/holoviews/pull/5910))
- Use browser information to set `pixel_ratio` in `ResampleOperation2D` ([5947](https://github.com/holoviz/holoviews/pull/5947))
- Avoid bounce back of events for `Range{X,Y,XY}` streams ([5946](https://github.com/holoviz/holoviews/pull/5946))

Bug fixes:

- Fix overlaying labels in Sankey diagram ([5864](https://github.com/holoviz/holoviews/pull/5864))
- Ensure the `PlotSize` stream works with undefined width/height ([5868](https://github.com/holoviz/holoviews/pull/5868))
- Fix test when only `python3` command is available ([5874](https://github.com/holoviz/holoviews/pull/5874))
- Try and except `get_extents` without the `dimension` argument and add kwargs to all `get_extents` ([5872](https://github.com/holoviz/holoviews/pull/5872))
- Enable `Mathjax` with `enable_mathjax` ([5904](https://github.com/holoviz/holoviews/pull/5904))
- Fix `histogram` operation on Ibis data ([5929](https://github.com/holoviz/holoviews/pull/5929))
- Raise exceptions in `compare_dataset` ([5932](https://github.com/holoviz/holoviews/pull/5932))
- Don't overlap objects in overlaid plot ([5942](https://github.com/holoviz/holoviews/pull/5942))

Compatibility:

- Param 2.0 support ([5865](https://github.com/holoviz/holoviews/pull/5865), [#5897](https://github.com/holoviz/holoviews/pull/5897), [#5906](https://github.com/holoviz/holoviews/pull/5906), [#5918](https://github.com/holoviz/holoviews/pull/5918))
- Pandas 2.1 support ([5877](https://github.com/holoviz/holoviews/pull/5877), [#5898](https://github.com/holoviz/holoviews/pull/5898), [#5880](https://github.com/holoviz/holoviews/pull/5880))
- Numpy 1.25 support ([5870](https://github.com/holoviz/holoviews/pull/5870))
- Replace `np.NaN` with `np.nan` for Numpy 2.0 ([5938](https://github.com/holoviz/holoviews/pull/5938))
- Bokeh 3.3 support ([5873](https://github.com/holoviz/holoviews/pull/5873), [#5923](https://github.com/holoviz/holoviews/pull/5923), [#5935](https://github.com/holoviz/holoviews/pull/5935))
- Dropping support for Bokeh 2 ([5891](https://github.com/holoviz/holoviews/pull/5891))
- Python 3.12 support ([5909](https://github.com/holoviz/holoviews/pull/5909))
- Dropping support for Python 3.8 ([5936](https://github.com/holoviz/holoviews/pull/5936))
- Matplotlib 3.8 compatibility ([5910](https://github.com/holoviz/holoviews/pull/5910), [#5924](https://github.com/holoviz/holoviews/pull/5924))
- Remove deprecations functions ([5915](https://github.com/holoviz/holoviews/pull/5915))

Documentation:

- Add _Linking Bokeh plots_ guide to the table of contents ([5900](https://github.com/holoviz/holoviews/pull/5900))

Maintenance:

- Remove warnings ([5854](https://github.com/holoviz/holoviews/pull/5854), [#5894](https://github.com/holoviz/holoviews/pull/5894))
- Add output of pre-commit hook in summary and add environment artifact ([5905](https://github.com/holoviz/holoviews/pull/5905))
- Improvements to test CI ([5917](https://github.com/holoviz/holoviews/pull/5917), [#5892](https://github.com/holoviz/holoviews/pull/5892))
- General maintenance update ([5889](https://github.com/holoviz/holoviews/pull/5889), [#5907](https://github.com/holoviz/holoviews/pull/5907), [#5934](https://github.com/holoviz/holoviews/pull/5934), [#5943](https://github.com/holoviz/holoviews/pull/5943))
- Update build of conda package ([5921](https://github.com/holoviz/holoviews/pull/5921), [#5922](https://github.com/holoviz/holoviews/pull/5922))
- Add sorting of imports ([5937](https://github.com/holoviz/holoviews/pull/5937))
- Enable Bugbear lint ([5861](https://github.com/holoviz/holoviews/pull/5861))