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| <section id="frequency-sketches"> |
| <h1>Frequency Sketches<a class="headerlink" href="#frequency-sketches" title="Link to this heading"></a></h1> |
| <p>Frequency estimation involves determining how often an item has been seen in a stream. The library currently |
| offers two types of sketches for frequency estimation, one of which has two closely-related variants.</p> |
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| <li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">frequent_items_sketch</span></code>: Identifies the <em>Top K</em> or <em>heavy hitters</em> in a stream, those items whose weight is above a certain percentage of the entire stream. Does not necessarily provide an estimate for most items outside the heavy hitters.</p></li> |
| <li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">frequent_strings_sketch</span></code>: Like the items version but containing snly strings (an implementation from before the library handled generic objects).</p></li> |
| <li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">count_min_sketch</span></code>: Provides an estimate for any item, regardless of relative weight, but does not maintain a list of the heaviest items.</p></li> |
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