Annotated Data (anndata)

anndata is a Python package designed for efficient handling of annotated data matrices, both in memory and on disk. Positioned between pandas and xarray, it offers robust features like sparse data support, lazy operations, and a PyTorch interface, making it a cornerstone in single-cell data analysis workflows. The library maintains an active development cycle with frequent patch releases to ensure stability and incorporate new features, building on stable minor and major versions.