| commit | 87e4d502205919f1e3ee9aeb7838731e677e6ef0 | [log] [tgz] |
|---|---|---|
| author | Patrick Damme <pdamme@know-center.at> | Sat Jan 23 19:58:32 2021 +0100 |
| committer | Matthias Boehm <mboehm7@gmail.com> | Sat Jan 23 20:00:20 2021 +0100 |
| tree | b03e700fbf827beafa843b8438688807ebdfb052 | |
| parent | 0bf27eaad3ffb40da8e6bf87d42721f0a333ba19 [diff] |
[SYSTEMDS-2801] New rewrite for removing (par)for loops w/o iterations This commit adds a new StatementBlockRewriteRule removing (par)for-loops which are known to iterate over an empty sequence, and, thus, will not perform a single iteration. This works if the loop's from, to, and increment are constants (possibly DML script arguments, and after constant folding). Furthermore, OptimizerUtils has a new flag determining whether this rule shall be applied. In ProgramRewriter's default rule sequence, this new rule is inserted directly after the removal of unnecessary branches, since they have a lot in common. Merging subsequent blocks is done once afterwards if any of removing unnecessary branches or removing (par)for-loops shall be applied. Closes #1165.
Overview: SystemDS is a versatile system for the end-to-end data science lifecycle from data integration, cleaning, and feature engineering, over efficient, local and distributed ML model training, to deployment and serving. To this end, we aim to provide a stack of declarative languages with R-like syntax for (1) the different tasks of the data-science lifecycle, and (2) users with different expertise. These high-level scripts are compiled into hybrid execution plans of local, in-memory CPU and GPU operations, as well as distributed operations on Apache Spark. In contrast to existing systems - that either provide homogeneous tensors or 2D Datasets - and in order to serve the entire data science lifecycle, the underlying data model are DataTensors, i.e., tensors (multi-dimensional arrays) whose first dimension may have a heterogeneous and nested schema.
Quick Start Install, Quick Start and Hello World
Documentation: SystemDS Documentation
Python Documentation Python SystemDS Documentation
Issue Tracker Jira Dashboard
Status and Build: SystemDS is renamed from SystemML which is an Apache Top Level Project. To build from source visit SystemDS Install from source
