Add altair-upset

_upsetversions/altair-upset.md

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+---
+layout: default
+key: altair-upset
+name: Altair UpSet
+type: Library
+source: https://github.com/edmundmiller/altair-upset
+web: https://altair-upset.readthedocs.io/en/latest/
+image: altair-upset.png
+authors: "Edmund Miller"
+publication:
+language: Python
+license: MIT License
+maintained: true
+interactive: true
+inline-attribute-vis: false
+attribute-views: false
+aggregation: false
+item-queries: false
+set-queries: false
+shows-deviation: false
+export: true
+format-table: false
+format-list: false
+format-set-expression: false
+---
+
+This is an implementation of an UpSet Plot in [Altair](https://altair-viz.github.io/). It is a Python package based on [UpSet Altair](https://github.com/hms-dbmi/upset-altair-notebook). 
+
+Key features:
+
+- Dynamic filtering and exploration through color legends
+- Rich tooltips for detailed intersection analysis
+- Flexible sorting of exclusive intersections
+- Customizable visual elements
+- Seamless integration with both Jupyter notebooks and web applications via Vega compilation