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  <h1>Source code for pyspark.ml.wrapper</h1><div class="highlight"><pre>
<span class="c">#</span>
<span class="c"># Licensed to the Apache Software Foundation (ASF) under one or more</span>
<span class="c"># contributor license agreements.  See the NOTICE file distributed with</span>
<span class="c"># this work for additional information regarding copyright ownership.</span>
<span class="c"># The ASF licenses this file to You under the Apache License, Version 2.0</span>
<span class="c"># (the &quot;License&quot;); you may not use this file except in compliance with</span>
<span class="c"># the License.  You may obtain a copy of the License at</span>
<span class="c">#</span>
<span class="c">#    http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c">#</span>
<span class="c"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c"># See the License for the specific language governing permissions and</span>
<span class="c"># limitations under the License.</span>
<span class="c">#</span>

<span class="kn">from</span> <span class="nn">abc</span> <span class="kn">import</span> <span class="n">ABCMeta</span>

<span class="kn">from</span> <span class="nn">pyspark</span> <span class="kn">import</span> <span class="n">SparkContext</span>
<span class="kn">from</span> <span class="nn">pyspark.sql</span> <span class="kn">import</span> <span class="n">DataFrame</span>
<span class="kn">from</span> <span class="nn">pyspark.ml.param</span> <span class="kn">import</span> <span class="n">Params</span>
<span class="kn">from</span> <span class="nn">pyspark.ml.pipeline</span> <span class="kn">import</span> <span class="n">Estimator</span><span class="p">,</span> <span class="n">Transformer</span><span class="p">,</span> <span class="n">Model</span>
<span class="kn">from</span> <span class="nn">pyspark.mllib.common</span> <span class="kn">import</span> <span class="n">inherit_doc</span><span class="p">,</span> <span class="n">_java2py</span><span class="p">,</span> <span class="n">_py2java</span>


<span class="k">def</span> <span class="nf">_jvm</span><span class="p">():</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Returns the JVM view associated with SparkContext. Must be called</span>
<span class="sd">    after SparkContext is initialized.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">jvm</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_jvm</span>
    <span class="k">if</span> <span class="n">jvm</span><span class="p">:</span>
        <span class="k">return</span> <span class="n">jvm</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="s">&quot;Cannot load _jvm from SparkContext. Is SparkContext initialized?&quot;</span><span class="p">)</span>


<span class="nd">@inherit_doc</span>
<span class="k">class</span> <span class="nc">JavaWrapper</span><span class="p">(</span><span class="n">Params</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Utility class to help create wrapper classes from Java/Scala</span>
<span class="sd">    implementations of pipeline components.</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="n">__metaclass__</span> <span class="o">=</span> <span class="n">ABCMeta</span>

    <span class="c">#: The wrapped Java companion object. Subclasses should initialize</span>
    <span class="c">#: it properly. The param values in the Java object should be</span>
    <span class="c">#: synced with the Python wrapper in fit/transform/evaluate/copy.</span>
    <span class="n">_java_obj</span> <span class="o">=</span> <span class="bp">None</span>

    <span class="nd">@staticmethod</span>
    <span class="k">def</span> <span class="nf">_new_java_obj</span><span class="p">(</span><span class="n">java_class</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Construct a new Java object.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
        <span class="n">java_obj</span> <span class="o">=</span> <span class="n">_jvm</span><span class="p">()</span>
        <span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="n">java_class</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">&quot;.&quot;</span><span class="p">):</span>
            <span class="n">java_obj</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">java_obj</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
        <span class="n">java_args</span> <span class="o">=</span> <span class="p">[</span><span class="n">_py2java</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">args</span><span class="p">]</span>
        <span class="k">return</span> <span class="n">java_obj</span><span class="p">(</span><span class="o">*</span><span class="n">java_args</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_make_java_param_pair</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">param</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Makes a Java parm pair.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
        <span class="n">param</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_resolveParam</span><span class="p">(</span><span class="n">param</span><span class="p">)</span>
        <span class="n">java_param</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">getParam</span><span class="p">(</span><span class="n">param</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
        <span class="n">java_value</span> <span class="o">=</span> <span class="n">_py2java</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">java_param</span><span class="o">.</span><span class="n">w</span><span class="p">(</span><span class="n">java_value</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_transfer_params_to_java</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Transforms the embedded params to the companion Java object.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">paramMap</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">extractParamMap</span><span class="p">()</span>
        <span class="k">for</span> <span class="n">param</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">param</span> <span class="ow">in</span> <span class="n">paramMap</span><span class="p">:</span>
                <span class="n">pair</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_make_java_param_pair</span><span class="p">(</span><span class="n">param</span><span class="p">,</span> <span class="n">paramMap</span><span class="p">[</span><span class="n">param</span><span class="p">])</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">pair</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_transfer_params_from_java</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Transforms the embedded params from the companion Java object.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
        <span class="k">for</span> <span class="n">param</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="p">:</span>
            <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">hasParam</span><span class="p">(</span><span class="n">param</span><span class="o">.</span><span class="n">name</span><span class="p">):</span>
                <span class="n">java_param</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">getParam</span><span class="p">(</span><span class="n">param</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
                <span class="n">value</span> <span class="o">=</span> <span class="n">_java2py</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">getOrDefault</span><span class="p">(</span><span class="n">java_param</span><span class="p">))</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_paramMap</span><span class="p">[</span><span class="n">param</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span>

    <span class="nd">@staticmethod</span>
    <span class="k">def</span> <span class="nf">_empty_java_param_map</span><span class="p">():</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Returns an empty Java ParamMap reference.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="n">_jvm</span><span class="p">()</span><span class="o">.</span><span class="n">org</span><span class="o">.</span><span class="n">apache</span><span class="o">.</span><span class="n">spark</span><span class="o">.</span><span class="n">ml</span><span class="o">.</span><span class="n">param</span><span class="o">.</span><span class="n">ParamMap</span><span class="p">()</span>


<span class="nd">@inherit_doc</span>
<span class="k">class</span> <span class="nc">JavaEstimator</span><span class="p">(</span><span class="n">Estimator</span><span class="p">,</span> <span class="n">JavaWrapper</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Base class for :py:class:`Estimator`s that wrap Java/Scala</span>
<span class="sd">    implementations.</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="n">__metaclass__</span> <span class="o">=</span> <span class="n">ABCMeta</span>

    <span class="k">def</span> <span class="nf">_create_model</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">java_model</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Creates a model from the input Java model reference.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">raise</span> <span class="ne">NotImplementedError</span><span class="p">()</span>

    <span class="k">def</span> <span class="nf">_fit_java</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dataset</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Fits a Java model to the input dataset.</span>
<span class="sd">        :param dataset: input dataset, which is an instance of</span>
<span class="sd">                        :py:class:`pyspark.sql.DataFrame`</span>
<span class="sd">        :param params: additional params (overwriting embedded values)</span>
<span class="sd">        :return: fitted Java model</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_transfer_params_to_java</span><span class="p">()</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">fit</span><span class="p">(</span><span class="n">dataset</span><span class="o">.</span><span class="n">_jdf</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_fit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dataset</span><span class="p">):</span>
        <span class="n">java_model</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_fit_java</span><span class="p">(</span><span class="n">dataset</span><span class="p">)</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_create_model</span><span class="p">(</span><span class="n">java_model</span><span class="p">)</span>


<span class="nd">@inherit_doc</span>
<span class="k">class</span> <span class="nc">JavaTransformer</span><span class="p">(</span><span class="n">Transformer</span><span class="p">,</span> <span class="n">JavaWrapper</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Base class for :py:class:`Transformer`s that wrap Java/Scala</span>
<span class="sd">    implementations.</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="n">__metaclass__</span> <span class="o">=</span> <span class="n">ABCMeta</span>

    <span class="k">def</span> <span class="nf">_transform</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">dataset</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_transfer_params_to_java</span><span class="p">()</span>
        <span class="k">return</span> <span class="n">DataFrame</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span><span class="n">dataset</span><span class="o">.</span><span class="n">_jdf</span><span class="p">),</span> <span class="n">dataset</span><span class="o">.</span><span class="n">sql_ctx</span><span class="p">)</span>


<span class="nd">@inherit_doc</span>
<span class="k">class</span> <span class="nc">JavaModel</span><span class="p">(</span><span class="n">Model</span><span class="p">,</span> <span class="n">JavaTransformer</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Base class for :py:class:`Model`s that wrap Java/Scala</span>
<span class="sd">    implementations. Subclasses should inherit this class before</span>
<span class="sd">    param mix-ins, because this sets the UID from the Java model.</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="n">__metaclass__</span> <span class="o">=</span> <span class="n">ABCMeta</span>

    <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">java_model</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Initialize this instance with a Java model object.</span>
<span class="sd">        Subclasses should call this constructor, initialize params,</span>
<span class="sd">        and then call _transformer_params_from_java.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">JavaModel</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">__init__</span><span class="p">()</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span> <span class="o">=</span> <span class="n">java_model</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">uid</span> <span class="o">=</span> <span class="n">java_model</span><span class="o">.</span><span class="n">uid</span><span class="p">()</span>

    <span class="k">def</span> <span class="nf">copy</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">extra</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Creates a copy of this instance with the same uid and some</span>
<span class="sd">        extra params. This implementation first calls Params.copy and</span>
<span class="sd">        then make a copy of the companion Java model with extra params.</span>
<span class="sd">        So both the Python wrapper and the Java model get copied.</span>
<span class="sd">        :param extra: Extra parameters to copy to the new instance</span>
<span class="sd">        :return: Copy of this instance</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="n">extra</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
            <span class="n">extra</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">()</span>
        <span class="n">that</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">JavaModel</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="n">extra</span><span class="p">)</span>
        <span class="n">that</span><span class="o">.</span><span class="n">_java_obj</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_empty_java_param_map</span><span class="p">())</span>
        <span class="n">that</span><span class="o">.</span><span class="n">_transfer_params_to_java</span><span class="p">()</span>
        <span class="k">return</span> <span class="n">that</span>

    <span class="k">def</span> <span class="nf">_call_java</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">):</span>
        <span class="n">m</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_java_obj</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span>
        <span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
        <span class="n">java_args</span> <span class="o">=</span> <span class="p">[</span><span class="n">_py2java</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">arg</span><span class="p">)</span> <span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">args</span><span class="p">]</span>
        <span class="k">return</span> <span class="n">_java2py</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">m</span><span class="p">(</span><span class="o">*</span><span class="n">java_args</span><span class="p">))</span>
</pre></div>

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