| commit | 498aef6c5915c8256da44a041049cc4a59a84d41 | [log] [tgz] |
|---|---|---|
| author | Matthias Boehm <mboehm7@gmail.com> | Wed May 20 23:37:12 2020 +0200 |
| committer | Matthias Boehm <mboehm7@gmail.com> | Wed May 20 23:37:12 2020 +0200 |
| tree | c790be2293dca5b184841fca2faaf4b79867e9d1 | |
| parent | f1bffeb299eec6a57d5290fd12c81ba92c9f03e2 [diff] |
[SYSTEMDS-339] Fix robustness lineage tracing/parsing, part I This patch adds steplm as a new parfor lineage tracing/parsing test case and fixes many related lineage tracing/parsing issues: 1) Parfor Lineage Merge: robustness against empty first worker (no lineage for result variable, e.g., due to conditional control flow) 2) Lineage Tracing: support for replace, rexpand 3) Lineage Parsing: support for seq, ifelse, log, log_nz, groupedagg, rmempty, replace, rexpand 4) Steplm: Improved initialization of parfor result variables to avoid cycles and stackoverflow errors in overwrite scenarios. 5) Minor: parsing of ternary operator codes However, additional fixes are required for lineage tracing wrt default handling in functions, literal replacement during dynamic recompilation, and better overwrite support in matrix indexing (currently this creates lineage cycles).
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
Status and Build: SystemDS is still in pre-alpha status. The original code base was forked from Apache SystemML 1.2 in September 2018. We will continue to support linear algebra programs over matrices, while replacing the underlying data model and compiler, as well as substantially extending the supported functionalities. Until the first release, you can build your own snapshot via Apache Maven: mvn clean package -P distribution.
