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> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">int</span></span></span><a class="headerlink" href="#voyager.Index.add_item" title="Link to this definition">#</a></dt>
<dd><p>Add a vector to this index.</p>
<dl class="field-list simple">
<dt class="field-odd">Paramete