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<div class="section" id="module-apache_beam.transforms.deduplicate">
<span id="apache-beam-transforms-deduplicate-module"></span><h1>apache_beam.transforms.deduplicate module<a class="headerlink" href="#module-apache_beam.transforms.deduplicate" title="Permalink to this headline"></a></h1>
<p>a collection of ptransforms for deduplicating elements.</p>
<dl class="class">
<dt id="apache_beam.transforms.deduplicate.DeduplicatePerKey">
<em class="property">class </em><code class="descclassname">apache_beam.transforms.deduplicate.</code><code class="descname">DeduplicatePerKey</code><span class="sig-paren">(</span><em>processing_time_duration=None</em>, <em>event_time_duration=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/deduplicate.html#DeduplicatePerKey"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.deduplicate.DeduplicatePerKey" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p>
<p>A PTransform which deduplicates &lt;key, value&gt; pair over a time domain and
threshold. Values in different windows will NOT be considered duplicates of
each other. Deduplication is guaranteed with respect of time domain and
duration.</p>
<p>Time durations are required so as to avoid unbounded memory and/or storage
requirements within a runner and care might need to be used to ensure that the
deduplication time limit is long enough to remove duplicates but short enough
to not cause performance problems within a runner. Each runner may provide an
optimized implementation of their choice using the deduplication time domain
and threshold specified.</p>
<p>Does not preserve any order the input PCollection might have had.</p>
<dl class="method">
<dt id="apache_beam.transforms.deduplicate.DeduplicatePerKey.expand">
<code class="descname">expand</code><span class="sig-paren">(</span><em>pcoll</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/deduplicate.html#DeduplicatePerKey.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.deduplicate.DeduplicatePerKey.expand" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="class">
<dt id="apache_beam.transforms.deduplicate.Deduplicate">
<em class="property">class </em><code class="descclassname">apache_beam.transforms.deduplicate.</code><code class="descname">Deduplicate</code><span class="sig-paren">(</span><em>processing_time_duration=None</em>, <em>event_time_duration=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/deduplicate.html#Deduplicate"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.deduplicate.Deduplicate" title="Permalink to this definition"></a></dt>
<dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p>
<p>Similar to DeduplicatePerKey, the Deduplicate transform takes any arbitray
value as input and uses value as key to deduplicate among certain amount of
time duration.</p>
<dl class="method">
<dt id="apache_beam.transforms.deduplicate.Deduplicate.expand">
<code class="descname">expand</code><span class="sig-paren">(</span><em>pcoll</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/deduplicate.html#Deduplicate.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.deduplicate.Deduplicate.expand" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
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