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<section id="list">
<h1>List<a class="headerlink" href="#list" title="Link to this heading"></a></h1>
<p>A <code class="docutils literal notranslate"><span class="pre">List</span></code> is represented either by an <code class="docutils literal notranslate"><span class="pre">OperationNode</span></code>, or the derived class <code class="docutils literal notranslate"><span class="pre">List</span></code>.</p>
<p>List can contain any of the other types: frame, matrix, scalar and itself list.
The list can be handled like a dictionary or a list primitive, since both access patters are the same at
dml script level.</p>
<p>Although it is possible to generate lists with the function calls or object construction specified below,
the recommended way is to use the methods defined on <code class="docutils literal notranslate"><span class="pre">SystemDSContext</span></code>, to read in a list from disk,
or construct one using either constructors <cite>array</cite>, <cite>dict</cite> or <cite>list</cite> provided in <code class="docutils literal notranslate"><span class="pre">SystemDSContext</span></code>.</p>
<dl class="py class">
<dt class="sig sig-object py" id="systemds.operator.List">
<em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">systemds.operator.</span></span><span class="sig-name descname"><span class="pre">List</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">sds_context</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">func</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'list'</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">unnamed_input_nodes</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">Iterable</span><span class="p"><span class="pre">[</span></span><a class="reference internal" href="../../script_building/dag.html#systemds.script_building.dag.DAGNode" title="systemds.script_building.dag.DAGNode"><span class="pre">DAGNode</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">float</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">bool</span><span class="p"><span class="pre">]</span></span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">named_input_nodes</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">Dict</span><span class="p"><span class="pre">[</span></span><span class="pre">str</span><span class="p"><span class="pre">,</span></span><span class="w"> </span><a class="reference internal" href="../../script_building/dag.html#systemds.script_building.dag.DAGNode" title="systemds.script_building.dag.DAGNode"><span class="pre">DAGNode</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">float</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">bool</span><span class="p"><span class="pre">]</span></span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#systemds.operator.List" title="Link to this definition"></a></dt>
<dd><dl class="py method">
<dt class="sig sig-object py" id="systemds.operator.List.__init__">
<span class="sig-name descname"><span class="pre">__init__</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">sds_context</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">func</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'list'</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">unnamed_input_nodes</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">Iterable</span><span class="p"><span class="pre">[</span></span><a class="reference internal" href="../../script_building/dag.html#systemds.script_building.dag.DAGNode" title="systemds.script_building.dag.DAGNode"><span class="pre">DAGNode</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">float</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">bool</span><span class="p"><span class="pre">]</span></span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">named_input_nodes</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">Dict</span><span class="p"><span class="pre">[</span></span><span class="pre">str</span><span class="p"><span class="pre">,</span></span><span class="w"> </span><a class="reference internal" href="../../script_building/dag.html#systemds.script_building.dag.DAGNode" title="systemds.script_building.dag.DAGNode"><span class="pre">DAGNode</span></a><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">str</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">int</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">float</span><span class="w"> </span><span class="p"><span class="pre">|</span></span><span class="w"> </span><span class="pre">bool</span><span class="p"><span class="pre">]</span></span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#systemds.operator.List.__init__" title="Link to this definition"></a></dt>
<dd><p>Create general <cite>OperationNode</cite></p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>sds_context</strong> – The SystemDS context for performing the operations</p></li>
<li><p><strong>operation</strong> – The name of the DML function to execute</p></li>
<li><p><strong>unnamed_input_nodes</strong> – inputs identified by their position, not name</p></li>
<li><p><strong>named_input_nodes</strong> – inputs with their respective parameter name</p></li>
<li><p><strong>is_python_local_data</strong> – if the data is local in python e.g. Numpy arrays
that this operation node returns multiple values. If set remember to set the output_types value as well.</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="systemds.operator.List.compute">
<span class="sig-name descname"><span class="pre">compute</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">verbose</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">lineage</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">bool</span></span><span class="w"> </span><span class="o"><span class="pre">=</span></span><span class="w"> </span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><span class="pre">array</span></span></span><a class="headerlink" href="#systemds.operator.List.compute" title="Link to this definition"></a></dt>
<dd><p>Get result of this operation. Builds the dml script and executes it in SystemDS, before this method is called
all operations are only building the DAG without actually executing (lazy evaluation).</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>verbose</strong> – Can be activated to print additional information such as created DML-Script</p></li>
<li><p><strong>lineage</strong> – Can be activated to print lineage trace till this node</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>the output as an python builtin data type or numpy array</p>
</dd>
</dl>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="systemds.operator.List.pass_python_data_to_prepared_script">
<span class="sig-name descname"><span class="pre">pass_python_data_to_prepared_script</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">sds</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">var_name</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">str</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">prepared_script</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">JavaObject</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><span class="pre">None</span></span></span><a class="headerlink" href="#systemds.operator.List.pass_python_data_to_prepared_script" title="Link to this definition"></a></dt>
<dd><p>Passes data from python to the prepared script object.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>jvm</strong> – the java virtual machine object</p></li>
<li><p><strong>var_name</strong> – the variable name the data should get in java</p></li>
<li><p><strong>prepared_script</strong> – the prepared script</p></li>
</ul>
</dd>
</dl>
</dd></dl>
</dd></dl>
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