# sourmash v3.0 release notes We are pleased to announce release 3.0 of sourmash! This release includes internal changes like the new Rust backend (replacing C++) and lays the groundwork for future improvements. The full documentation for this version is available at https://sourmash.readthedocs.io/en/v3.0.0/. Documentation for the latest released version is at http://sourmash.readthedocs.io/en/stable/. **This release is compatible with sourmash 2.0: the sourmash Python API, command-line, signature and databases file formats are all the same.** We are releasing 3.0 to indicate the build system and internal implementation changed. Please post questions about migrating to sourmash 3.0 in the [sourmash issue tracker](https://github.com/dib-lab/sourmash/issues/new). ## Highlighted changes since 2.0 This is a list of substantial new features and functionality since sourmash 2.0. For more details check the [releases page on GitHub](https://github.com/dib-lab/sourmash/releases). Features: - Replacing C++ with Rust ([#424](https://github.com/dib-lab/sourmash/pull/424)) - Create an `Index` abstract base class ([#556](https://github.com/dib-lab/sourmash/pull/556)) - Dayhoff and HP encoding for proteins ([#689](https://github.com/dib-lab/sourmash/pull/689)) ([#758](https://github.com/dib-lab/sourmash/pull/758)) - Add `sourmash signature filter` to do abundance filtering. ([#748](https://github.com/dib-lab/sourmash/pull/748)) - Parallelized compare function with multiprocessing ([#709](https://github.com/dib-lab/sourmash/pull/709)) - add compute signatures for 10x bam file ([#713](https://github.com/dib-lab/sourmash/pull/713)) Improvements: - improve error handling in `sourmash lca index`. ([#798](https://github.com/dib-lab/sourmash/pull/798)) - Include more base deps: numpy, scipy and matplotlib ([#770](https://github.com/dib-lab/sourmash/pull/770)) - use `bam2fasta` package to simplify `sourmash compute` ([#768](https://github.com/dib-lab/sourmash/pull/768)) - add a `--abundances-from` flag to sourmash signature intersect, to preserve abundances ([#747](https://github.com/dib-lab/sourmash/pull/747)) - Compare outputs can be saved to an output dir ([#715](https://github.com/dib-lab/sourmash/pull/715))