| |
| |
| <!DOCTYPE html> |
| <html class="writer-html5" lang="en" > |
| <head> |
| <meta charset="utf-8"> |
| |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| |
| <title>SystemDSContext — SystemDS 2.0.0 documentation</title> |
| |
| |
| |
| <link rel="stylesheet" href="../../static/css/theme.css" type="text/css" /> |
| <link rel="stylesheet" href="../../static/pygments.css" type="text/css" /> |
| |
| |
| |
| |
| |
| |
| |
| <!--[if lt IE 9]> |
| <script src="../../static/js/html5shiv.min.js"></script> |
| <![endif]--> |
| |
| |
| <script type="text/javascript" id="documentation_options" data-url_root="../../" src="../../static/documentation_options.js"></script> |
| <script src="../../static/jquery.js"></script> |
| <script src="../../static/underscore.js"></script> |
| <script src="../../static/doctools.js"></script> |
| <script src="../../static/language_data.js"></script> |
| |
| <script type="text/javascript" src="../../static/js/theme.js"></script> |
| |
| |
| <link rel="index" title="Index" href="../../genindex.html" /> |
| <link rel="search" title="Search" href="../../search.html" /> |
| <link rel="next" title="Data Generators" href="../matrix/data_gen.html" /> |
| <link rel="prev" title="Algorithms" href="../operator/algorithms.html" /> |
| </head> |
| |
| <body class="wy-body-for-nav"> |
| |
| |
| <div class="wy-grid-for-nav"> |
| |
| <nav data-toggle="wy-nav-shift" class="wy-nav-side"> |
| <div class="wy-side-scroll"> |
| <div class="wy-side-nav-search" > |
| |
| |
| |
| <a href="../../index.html" class="icon icon-home" alt="Documentation Home"> SystemDS |
| |
| |
| |
| </a> |
| |
| |
| |
| |
| |
| |
| |
| <div role="search"> |
| <form id="rtd-search-form" class="wy-form" action="../../search.html" method="get"> |
| <input type="text" name="q" placeholder="Search docs" /> |
| <input type="hidden" name="check_keywords" value="yes" /> |
| <input type="hidden" name="area" value="default" /> |
| </form> |
| </div> |
| |
| |
| </div> |
| |
| |
| <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation"> |
| |
| |
| |
| |
| |
| |
| <p class="caption"><span class="caption-text">Getting Started:</span></p> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../../getting_started/install.html">Install SystemDS</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../getting_started/simple_examples.html">QuickStart</a></li> |
| </ul> |
| <p class="caption"><span class="caption-text">Guides</span></p> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../../guide/federated.html">Federated Environment</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../guide/algorithms.html">Built-in Algorithms</a></li> |
| </ul> |
| <p class="caption"><span class="caption-text">Onnx SystemDS</span></p> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../../onnx_systemds/onnx_systemds.html">QuickStart Onnx</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../../onnx_systemds/onnx_systemds_design.html">Design</a></li> |
| </ul> |
| <p class="caption"><span class="caption-text">API</span></p> |
| <ul class="current"> |
| <li class="toctree-l1"><a class="reference internal" href="../operator/algorithms.html">Algorithms</a></li> |
| <li class="toctree-l1 current"><a class="current reference internal" href="#">SystemDSContext</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../matrix/data_gen.html">Data Generators</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../matrix/matrix.html">Matrix</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../matrix/federated.html">Federated</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../operator/operation_node.html">Operation Node</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../onnx_systemds/convert.html">Convert</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../onnx_systemds/onnx_helper.html">Onnx Helper</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../onnx_systemds/operator_gen.html">Operator Gen</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../onnx_systemds/render.html">Render</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../onnx_systemds/util.html">Util</a></li> |
| </ul> |
| <p class="caption"><span class="caption-text">Internals API</span></p> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="../script_building/dag.html">Dag</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../script_building/script.html">Script</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../utils/converters.html">Converters</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="../utils/helpers.html">Helpers</a></li> |
| </ul> |
| |
| |
| |
| </div> |
| |
| </div> |
| </nav> |
| |
| <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> |
| |
| |
| <nav class="wy-nav-top" aria-label="top navigation"> |
| |
| <i data-toggle="wy-nav-top" class="fa fa-bars"></i> |
| <a href="../../index.html">SystemDS</a> |
| |
| </nav> |
| |
| |
| <div class="wy-nav-content"> |
| |
| <div class="rst-content"> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <div role="navigation" aria-label="breadcrumbs navigation"> |
| |
| <ul class="wy-breadcrumbs"> |
| |
| <li><a href="../../index.html" class="icon icon-home"></a> »</li> |
| |
| <li>SystemDSContext</li> |
| |
| |
| <li class="wy-breadcrumbs-aside"> |
| |
| |
| <a href="../../sources/api/context/systemds_context.rst.txt" rel="nofollow"> View page source</a> |
| |
| |
| </li> |
| |
| </ul> |
| |
| |
| <hr/> |
| </div> |
| <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> |
| <div itemprop="articleBody"> |
| |
| <div class="section" id="systemdscontext"> |
| <h1>SystemDSContext<a class="headerlink" href="#systemdscontext" title="Permalink to this headline">¶</a></h1> |
| <p>All operations using SystemDS need a java instance running. |
| The connection is ensured by an <code class="docutils literal notranslate"><span class="pre">SystemDSContext</span></code> object. |
| An <code class="docutils literal notranslate"><span class="pre">SystemDSContext</span></code> object can be created using:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">systemds.context</span> <span class="kn">import</span> <span class="n">SystemDSContext</span> |
| <span class="n">sds</span> <span class="o">=</span> <span class="n">SystemDSContext</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <p>When the calculations are finished the context has to be closed again:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sds</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> |
| </pre></div> |
| </div> |
| <p>Since it is annoying that it is always necessary to close the context, <code class="docutils literal notranslate"><span class="pre">SystemDSContext</span></code> |
| implements the python context management protocol, which supports the following syntax:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">with</span> <span class="n">SystemDSContext</span><span class="p">()</span> <span class="k">as</span> <span class="n">sds</span><span class="p">:</span> |
| <span class="c1"># do something with sds which is an SystemDSContext</span> |
| <span class="k">pass</span> |
| </pre></div> |
| </div> |
| <p>This will automatically close the <code class="docutils literal notranslate"><span class="pre">SystemDSContext</span></code> once the with-block is left.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Creating a context is an expensive procedure, because a sub-process starting a JVM might have to start, therefore |
| try to do this only once for your program, or always leave at least one context open.</p> |
| </div> |
| <dl class="py class"> |
| <dt id="systemds.context.SystemDSContext"> |
| <em class="property">class </em><code class="sig-prename descclassname">systemds.context.</code><code class="sig-name descname">SystemDSContext</code><a class="headerlink" href="#systemds.context.SystemDSContext" title="Permalink to this definition">¶</a></dt> |
| <dd><p>A context with a connection to a java instance with which SystemDS operations are executed. |
| The java process is started and is running using a random tcp port for instruction parsing.</p> |
| <dl class="py method"> |
| <dt id="systemds.context.SystemDSContext.__init__"> |
| <code class="sig-name descname">__init__</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#systemds.context.SystemDSContext.__init__" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Starts a new instance of SystemDSContext, in which the connection to a JVM systemds instance is handled |
| Any new instance of this SystemDS Context, would start a separate new JVM.</p> |
| <p>Standard out and standard error form the JVM is also handled in this class, filling up Queues, |
| that can be read from to get the printed statements from the JVM.</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="systemds.context.SystemDSContext.close"> |
| <code class="sig-name descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#systemds.context.SystemDSContext.close" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Close the connection to the java process and do necessary cleanup.</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="systemds.context.SystemDSContext.get_stderr"> |
| <code class="sig-name descname">get_stderr</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">lines</span><span class="p">:</span> <span class="n">int</span> <span class="o">=</span> <span class="default_value">1</span></em><span class="sig-paren">)</span><a class="headerlink" href="#systemds.context.SystemDSContext.get_stderr" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Getter for the stderr of the java subprocess |
| The output is taken from the stderr queue and returned in a new list. |
| :param lines: The number of lines to try to read from the stderr queue</p> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt id="systemds.context.SystemDSContext.get_stdout"> |
| <code class="sig-name descname">get_stdout</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">lines</span><span class="p">:</span> <span class="n">int</span> <span class="o">=</span> <span class="default_value">1</span></em><span class="sig-paren">)</span><a class="headerlink" href="#systemds.context.SystemDSContext.get_stdout" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Getter for the stdout of the java subprocess |
| The output is taken from the stdout queue and returned in a new list. |
| :param lines: The number of lines to try to read from the stdout queue</p> |
| </dd></dl> |
| |
| </dd></dl> |
| |
| </div> |
| |
| |
| </div> |
| |
| </div> |
| <footer> |
| |
| <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> |
| |
| <a href="../matrix/data_gen.html" class="btn btn-neutral float-right" title="Data Generators" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a> |
| |
| |
| <a href="../operator/algorithms.html" class="btn btn-neutral float-left" title="Algorithms" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a> |
| |
| </div> |
| |
| |
| <hr/> |
| |
| <div role="contentinfo"> |
| <p> |
| |
| © Copyright 2020, Apache SystemDS |
| |
| </p> |
| </div> |
| |
| |
| |
| Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a |
| |
| <a href="https://github.com/rtfd/sphinx_rtd_theme">theme</a> |
| |
| provided by <a href="https://readthedocs.org">Read the Docs</a>. |
| |
| </footer> |
| |
| </div> |
| </div> |
| |
| </section> |
| |
| </div> |
| |
| |
| <script type="text/javascript"> |
| jQuery(function () { |
| SphinxRtdTheme.Navigation.enable(true); |
| }); |
| </script> |
| |
| |
| |
| |
| |
| |
| </body> |
| </html> |