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<h1>Apache SystemDS<sup id="trademark">&trade;</sup> 2.2.0 Release Notes</h1>
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<h2 id="release-notes-for-systemds-220">Release notes for SystemDS 2.2.0</h2>
<p>SystemDS 2.2 is a minor release. This release contains major improvements to existing features,
a large number of performance and robustness fixes, and some experimental features to better
support the end-to-end data science lifecycle. In addition to that, this is the last release
with Java 8 and Spark 2.x.</p>
<p>The major changes (compared to SystemDS 2.1) include:</p>
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<li>Federated Backend: Extended operations and built-ins to support various workflows and algorithms.</li>
<li>Full support for compressed linear algebra.</li>
<li>Full support for multithreaded feature transformation.</li>
<li>Various performance improvements to existing builtins in SystemDS’s local, distributed, and native runtimes.</li>
<li>Performance and robustness fixes for eval. Parfor support for eval.</li>
<li>Robust performance test suite.</li>
<li>Asynchronous triggering of spark operations via prefetch and broadcast</li>
<li>New feature: Generating custom readers by example [experimental]</li>
<li>Robust release automation scripts with dry-run support.</li>
<li>Miscellaneous Improvements: Improved documentation, better testing, Python API, GPU backend.</li>
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