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<h1>Source code for pyspark.mllib.common</h1><div class="highlight"><pre>
<span></span><span class="c1">#</span>
<span class="c1"># Licensed to the Apache Software Foundation (ASF) under one or more</span>
<span class="c1"># contributor license agreements. See the NOTICE file distributed with</span>
<span class="c1"># this work for additional information regarding copyright ownership.</span>
<span class="c1"># The ASF licenses this file to You under the Apache License, Version 2.0</span>
<span class="c1"># (the &quot;License&quot;); you may not use this file except in compliance with</span>
<span class="c1"># the License. You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="c1">#</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">Any</span><span class="p">,</span> <span class="n">Callable</span><span class="p">,</span> <span class="n">TYPE_CHECKING</span>
<span class="k">if</span> <span class="n">TYPE_CHECKING</span><span class="p">:</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">pyspark.mllib._typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">C</span><span class="p">,</span> <span class="n">JavaObjectOrPickleDump</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">py4j.protocol</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">py4j.protocol</span><span class="w"> </span><span class="kn">import</span> <span class="n">Py4JJavaError</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">py4j.java_gateway</span><span class="w"> </span><span class="kn">import</span> <span class="n">JavaObject</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">py4j.java_collections</span><span class="w"> </span><span class="kn">import</span> <span class="n">JavaArray</span><span class="p">,</span> <span class="n">JavaList</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">pyspark.context</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">pyspark</span><span class="w"> </span><span class="kn">import</span> <span class="n">RDD</span><span class="p">,</span> <span class="n">SparkContext</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">pyspark.serializers</span><span class="w"> </span><span class="kn">import</span> <span class="n">CPickleSerializer</span><span class="p">,</span> <span class="n">AutoBatchedSerializer</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">pyspark.sql</span><span class="w"> </span><span class="kn">import</span> <span class="n">DataFrame</span><span class="p">,</span> <span class="n">SparkSession</span>
<span class="c1"># Hack for support float(&#39;inf&#39;) in Py4j</span>
<span class="n">_old_smart_decode</span> <span class="o">=</span> <span class="n">py4j</span><span class="o">.</span><span class="n">protocol</span><span class="o">.</span><span class="n">smart_decode</span>
<span class="n">_float_str_mapping</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">&quot;nan&quot;</span><span class="p">:</span> <span class="s2">&quot;NaN&quot;</span><span class="p">,</span>
<span class="s2">&quot;inf&quot;</span><span class="p">:</span> <span class="s2">&quot;Infinity&quot;</span><span class="p">,</span>
<span class="s2">&quot;-inf&quot;</span><span class="p">:</span> <span class="s2">&quot;-Infinity&quot;</span><span class="p">,</span>
<span class="p">}</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_new_smart_decode</span><span class="p">(</span><span class="n">obj</span><span class="p">:</span> <span class="n">Any</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="nb">float</span><span class="p">):</span>
<span class="n">s</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
<span class="k">return</span> <span class="n">_float_str_mapping</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">s</span><span class="p">)</span>
<span class="k">return</span> <span class="n">_old_smart_decode</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
<span class="n">py4j</span><span class="o">.</span><span class="n">protocol</span><span class="o">.</span><span class="n">smart_decode</span> <span class="o">=</span> <span class="n">_new_smart_decode</span>
<span class="n">_picklable_classes</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">&quot;LinkedList&quot;</span><span class="p">,</span>
<span class="s2">&quot;SparseVector&quot;</span><span class="p">,</span>
<span class="s2">&quot;DenseVector&quot;</span><span class="p">,</span>
<span class="s2">&quot;DenseMatrix&quot;</span><span class="p">,</span>
<span class="s2">&quot;Rating&quot;</span><span class="p">,</span>
<span class="s2">&quot;LabeledPoint&quot;</span><span class="p">,</span>
<span class="p">]</span>
<span class="c1"># this will call the MLlib version of pythonToJava()</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_to_java_object_rdd</span><span class="p">(</span><span class="n">rdd</span><span class="p">:</span> <span class="n">RDD</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">JavaObject</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Return a JavaRDD of Object by unpickling</span>
<span class="sd"> It will convert each Python object into Java object by Pickle, whenever the</span>
<span class="sd"> RDD is serialized in batch or not.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">rdd</span> <span class="o">=</span> <span class="n">rdd</span><span class="o">.</span><span class="n">_reserialize</span><span class="p">(</span><span class="n">AutoBatchedSerializer</span><span class="p">(</span><span class="n">CPickleSerializer</span><span class="p">()))</span>
<span class="k">assert</span> <span class="n">rdd</span><span class="o">.</span><span class="n">ctx</span><span class="o">.</span><span class="n">_jvm</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="k">return</span> <span class="n">rdd</span><span class="o">.</span><span class="n">ctx</span><span class="o">.</span><span class="n">_jvm</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">mllib</span><span class="o">.</span><span class="n">api</span><span class="o">.</span><span class="n">python</span><span class="o">.</span><span class="n">SerDe</span><span class="o">.</span><span class="n">pythonToJava</span><span class="p">(</span><span class="n">rdd</span><span class="o">.</span><span class="n">_jrdd</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_py2java</span><span class="p">(</span><span class="n">sc</span><span class="p">:</span> <span class="n">SparkContext</span><span class="p">,</span> <span class="n">obj</span><span class="p">:</span> <span class="n">Any</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">JavaObject</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Convert Python object into Java&quot;&quot;&quot;</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">RDD</span><span class="p">):</span>
<span class="n">obj</span> <span class="o">=</span> <span class="n">_to_java_object_rdd</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">DataFrame</span><span class="p">):</span>
<span class="n">obj</span> <span class="o">=</span> <span class="n">obj</span><span class="o">.</span><span class="n">_jdf</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">SparkContext</span><span class="p">):</span>
<span class="n">obj</span> <span class="o">=</span> <span class="n">obj</span><span class="o">.</span><span class="n">_jsc</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
<span class="n">obj</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">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">obj</span><span class="p">]</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">JavaObject</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="p">(</span><span class="nb">int</span><span class="p">,</span> <span class="nb">float</span><span class="p">,</span> <span class="nb">bool</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">,</span> <span class="nb">str</span><span class="p">)):</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="nb">bytearray</span><span class="p">(</span><span class="n">CPickleSerializer</span><span class="p">()</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">obj</span><span class="p">))</span>
<span class="k">assert</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="n">obj</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</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">mllib</span><span class="o">.</span><span class="n">api</span><span class="o">.</span><span class="n">python</span><span class="o">.</span><span class="n">SerDe</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="k">return</span> <span class="n">obj</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_java2py</span><span class="p">(</span><span class="n">sc</span><span class="p">:</span> <span class="n">SparkContext</span><span class="p">,</span> <span class="n">r</span><span class="p">:</span> <span class="s2">&quot;JavaObjectOrPickleDump&quot;</span><span class="p">,</span> <span class="n">encoding</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;bytes&quot;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Any</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">r</span><span class="p">,</span> <span class="n">JavaObject</span><span class="p">):</span>
<span class="n">clsName</span> <span class="o">=</span> <span class="n">r</span><span class="o">.</span><span class="n">getClass</span><span class="p">()</span><span class="o">.</span><span class="n">getSimpleName</span><span class="p">()</span>
<span class="c1"># convert RDD into JavaRDD</span>
<span class="k">if</span> <span class="n">clsName</span> <span class="o">!=</span> <span class="s2">&quot;JavaRDD&quot;</span> <span class="ow">and</span> <span class="n">clsName</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s2">&quot;RDD&quot;</span><span class="p">):</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">r</span><span class="o">.</span><span class="n">toJavaRDD</span><span class="p">()</span>
<span class="n">clsName</span> <span class="o">=</span> <span class="s2">&quot;JavaRDD&quot;</span>
<span class="k">assert</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="k">if</span> <span class="n">clsName</span> <span class="o">==</span> <span class="s2">&quot;JavaRDD&quot;</span><span class="p">:</span>
<span class="n">jrdd</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</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">mllib</span><span class="o">.</span><span class="n">api</span><span class="o">.</span><span class="n">python</span><span class="o">.</span><span class="n">SerDe</span><span class="o">.</span><span class="n">javaToPython</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
<span class="k">return</span> <span class="n">RDD</span><span class="p">(</span><span class="n">jrdd</span><span class="p">,</span> <span class="n">sc</span><span class="p">)</span>
<span class="k">if</span> <span class="n">clsName</span> <span class="o">==</span> <span class="s2">&quot;Dataset&quot;</span><span class="p">:</span>
<span class="k">return</span> <span class="n">DataFrame</span><span class="p">(</span><span class="n">r</span><span class="p">,</span> <span class="n">SparkSession</span><span class="o">.</span><span class="n">_getActiveSessionOrCreate</span><span class="p">())</span>
<span class="k">if</span> <span class="n">clsName</span> <span class="ow">in</span> <span class="n">_picklable_classes</span><span class="p">:</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</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">mllib</span><span class="o">.</span><span class="n">api</span><span class="o">.</span><span class="n">python</span><span class="o">.</span><span class="n">SerDe</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">r</span><span class="p">,</span> <span class="p">(</span><span class="n">JavaArray</span><span class="p">,</span> <span class="n">JavaList</span><span class="p">)):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</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">mllib</span><span class="o">.</span><span class="n">api</span><span class="o">.</span><span class="n">python</span><span class="o">.</span><span class="n">SerDe</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
<span class="k">except</span> <span class="n">Py4JJavaError</span><span class="p">:</span>
<span class="k">pass</span> <span class="c1"># not pickable</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">r</span><span class="p">,</span> <span class="p">(</span><span class="nb">bytearray</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">)):</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">CPickleSerializer</span><span class="p">()</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="nb">bytes</span><span class="p">(</span><span class="n">r</span><span class="p">),</span> <span class="n">encoding</span><span class="o">=</span><span class="n">encoding</span><span class="p">)</span>
<span class="k">return</span> <span class="n">r</span>
<span class="k">def</span><span class="w"> </span><span class="nf">callJavaFunc</span><span class="p">(</span>
<span class="n">sc</span><span class="p">:</span> <span class="n">pyspark</span><span class="o">.</span><span class="n">context</span><span class="o">.</span><span class="n">SparkContext</span><span class="p">,</span> <span class="n">func</span><span class="p">:</span> <span class="n">Callable</span><span class="p">[</span><span class="o">...</span><span class="p">,</span> <span class="s2">&quot;JavaObjectOrPickleDump&quot;</span><span class="p">],</span> <span class="o">*</span><span class="n">args</span><span class="p">:</span> <span class="n">Any</span>
<span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Any</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Call Java Function&quot;&quot;&quot;</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">a</span><span class="p">)</span> <span class="k">for</span> <span class="n">a</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">func</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="w"> </span><span class="nf">callMLlibFunc</span><span class="p">(</span><span class="n">name</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">:</span> <span class="n">Any</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Any</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Call API in PythonMLLibAPI&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">getOrCreate</span><span class="p">()</span>
<span class="k">assert</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="n">api</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">sc</span><span class="o">.</span><span class="n">_jvm</span><span class="o">.</span><span class="n">PythonMLLibAPI</span><span class="p">(),</span> <span class="n">name</span><span class="p">)</span>
<span class="k">return</span> <span class="n">callJavaFunc</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">api</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">)</span>
<span class="k">class</span><span class="w"> </span><span class="nc">JavaModelWrapper</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Wrapper for the model in JVM</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__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="n">JavaObject</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">getOrCreate</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_java_model</span> <span class="o">=</span> <span class="n">java_model</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sc</span><span class="o">.</span><span class="n">_gateway</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_sc</span><span class="o">.</span><span class="n">_gateway</span><span class="o">.</span><span class="n">detach</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_java_model</span><span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">call</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="nb">str</span><span class="p">,</span> <span class="o">*</span><span class="n">a</span><span class="p">:</span> <span class="n">Any</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Any</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Call method of java_model&quot;&quot;&quot;</span>
<span class="k">return</span> <span class="n">callJavaFunc</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sc</span><span class="p">,</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_java_model</span><span class="p">,</span> <span class="n">name</span><span class="p">),</span> <span class="o">*</span><span class="n">a</span><span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">inherit_doc</span><span class="p">(</span><span class="bp">cls</span><span class="p">:</span> <span class="s2">&quot;C&quot;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s2">&quot;C&quot;</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> A decorator that makes a class inherit documentation from its parents.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">func</span> <span class="ow">in</span> <span class="nb">vars</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="c1"># only inherit docstring for public functions</span>
<span class="k">if</span> <span class="n">name</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s2">&quot;_&quot;</span><span class="p">):</span>
<span class="k">continue</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">func</span><span class="o">.</span><span class="vm">__doc__</span><span class="p">:</span>
<span class="k">for</span> <span class="n">parent</span> <span class="ow">in</span> <span class="bp">cls</span><span class="o">.</span><span class="vm">__bases__</span><span class="p">:</span>
<span class="n">parent_func</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">parent</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">parent_func</span> <span class="ow">and</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">parent_func</span><span class="p">,</span> <span class="s2">&quot;__doc__&quot;</span><span class="p">,</span> <span class="kc">None</span><span class="p">):</span>
<span class="n">func</span><span class="o">.</span><span class="vm">__doc__</span> <span class="o">=</span> <span class="n">parent_func</span><span class="o">.</span><span class="vm">__doc__</span>
<span class="k">break</span>
<span class="k">return</span> <span class="bp">cls</span>
</pre></div>
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