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| <h1>Apache SystemDS<sup id="trademark">™</sup> 1.2.0 Release Notes</h1> |
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| <p>The Apache SystemML 1.2.0 release was approved on Aug. 24th, 2018. The release includes enhancements, features, and additions as listed below.</p> |
| |
| <h3 id="new-builtin-functionsoperationsscriptsfeatures">New Builtin Functions/Operations/Scripts/Features</h3> |
| <ul> |
| <li>Factorization Machines</li> |
| <li>Support for functions with default parameters</li> |
| <li><code class="language-plaintext highlighter-rouge">exists()</code> for checking of existing variables</li> |
| <li>Triangular matrix functions: <code class="language-plaintext highlighter-rouge">lower.tri()</code> and <code class="language-plaintext highlighter-rouge">upper.tri()</code></li> |
| <li>New nary min/max operations</li> |
| <li><code class="language-plaintext highlighter-rouge">as.matrix()</code> over list of scalars</li> |
| <li>Function calls with named function arguments</li> |
| <li>Convolution operations (forward/backward)</li> |
| <li>Maxpooling operations (forward)</li> |
| <li>Support for bias_add and bias_mult</li> |
| <li>Global constants</li> |
| <li>Added support for rowProd/colProd</li> |
| <li>DML eval function</li> |
| <li>New data type list for lists and structs</li> |
| </ul> |
| |
| <h3 id="api">API</h3> |
| <ul> |
| <li>JMLC API extension for passing multiple dml scripts</li> |
| </ul> |
| |
| <h3 id="compiler--runtime">Compiler & Runtime</h3> |
| <ul> |
| <li>Code motion framework</li> |
| <li>Global subexpression elimination</li> |
| <li>Optional rewrite for hoisting loop-invariant operations</li> |
| <li>Improved IPA constant propagation and replacement</li> |
| <li>ParFor Data Partitioning Rewrite on Hops instead of Statements</li> |
| <li>New rewrites for chains of comparisons</li> |
| <li>Extended rewrite framework for codegen plans</li> |
| <li>Improved parfor optimizer rewrite for in-place-update</li> |
| <li>Rework function block recompilation</li> |
| <li>Support rowMeans in codegen row templates</li> |
| </ul> |
| |
| <h3 id="performance-improvements">Performance Improvements</h3> |
| <ul> |
| <li>Improved multi-threading of unary aggregates</li> |
| <li>Reuse of fair scheduler pools in local parfor workers</li> |
| <li>Performance issues Spark ctable(X,Y) w/ large num distinct</li> |
| <li>Performance instruction generation</li> |
| <li>Performance sample operations</li> |
| <li>Performance ultra-sparse block operations</li> |
| <li>New native tsmm operator and its integration</li> |
| <li>Multi-threaded unary operations (e.g., exp, log, sigmoid)</li> |
| </ul> |
| |
| <h3 id="bug-fixes">Bug Fixes</h3> |
| <ul> |
| <li>Memory leak buffer pool due to missing variable cleanup</li> |
| <li>Missing buffer pool serialization of compressed matrices</li> |
| <li>Compilation failure on inferring size of reshapes w/ zero rows/columns</li> |
| <li>Incorrect result for min/max over matrices with NaNs</li> |
| <li>Missing support for external functions with variable number of outputs</li> |
| <li>Reblock ultra-sparse matrix fails with index out of bounds</li> |
| <li>Performance issue CSE on DAGs w/ many root nodes (e.g., resnet200)</li> |
| <li>Non-fused bias_add builtin creates incorrect results over sparse inputs</li> |
| <li>Inconsistent namespace naming depending on OS</li> |
| <li>Codegen failing on three-way multi-aggregate</li> |
| <li>Codegen optimizer failing for MLogreg special cases</li> |
| <li>Failing matrix market to binary reblock with zero rows/columns</li> |
| </ul> |
| |
| <h3 id="deprecatedremovedcleanup">Deprecated/Removed/Cleanup</h3> |
| <ul> |
| <li>Opt level 4</li> |
| <li>File-based removeEmpty()</li> |
| <li>Cleanup exception handling apis/compiler/runtime</li> |
| </ul> |
| |
| <h3 id="experimental">Experimental</h3> |
| <ul> |
| <li>Parameter server: local backend and distributed</li> |
| <li>Sparsity estimators</li> |
| </ul> |
| |
| <h3 id="jira-release-notes"><a href="https://issues.apache.org/jira/secure/ReleaseNote.jspa?version=12342959&projectId=12319522">JIRA release notes</a></h3> |
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