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<div class="section" id="event">
<h1>Event<a class="headerlink" href="#event" title="Permalink to this heading">¶</a></h1>
<dl class="py class">
<dt class="sig sig-object py" id="torch.Event">
<em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">torch.</span></span><span class="sig-name descname"><span class="pre">Event</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">device</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">enable_timing</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#torch.Event" title="Permalink to this definition">¶</a></dt>
<dd><p>Query and record Stream status to identify or control dependencies across Stream and measure timing.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>device</strong> (<a class="reference internal" href="../tensor_attributes.html#torch.device" title="torch.device"><code class="xref py py-class docutils literal notranslate"><span class="pre">torch.device</span></code></a>, optional) – the desired device for the Event.
If not given, the current <a class="reference internal" href="../torch.html#accelerators"><span class="std std-ref">accelerator</span></a> type will be used.</p></li>
<li><p><strong>enable_timing</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.13)"><em>bool</em></a><em>, </em><em>optional</em>) – indicates if the event should measure time (default: <code class="docutils literal notranslate"><span class="pre">False</span></code>).</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>An torch.Event object.</p>
</dd>
<dt class="field-odd">Return type</dt>
<dd class="field-odd"><p><a class="reference internal" href="#torch.Event" title="torch.Event">Event</a></p>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">e_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Event</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
</pre></div>
</div>
<dl class="py method">
<dt class="sig sig-object py" id="torch.Event.elapsed_time">
<span class="sig-name descname"><span class="pre">elapsed_time</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">end_event</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/functions.html#float" title="(in Python v3.13)"><span class="pre">float</span></a></span></span><a class="headerlink" href="#torch.Event.elapsed_time" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the elapsed time in milliseconds between when this event and the <code class="xref py py-attr docutils literal notranslate"><span class="pre">end_event</span></code> are
each recorded via <a class="reference internal" href="torch.Stream.html#torch.Stream.record_event" title="torch.Stream.record_event"><code class="xref py py-func docutils literal notranslate"><span class="pre">torch.Stream.record_event()</span></code></a>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>end_event</strong> (<a class="reference internal" href="#torch.Event" title="torch.Event"><code class="xref py py-class docutils literal notranslate"><span class="pre">torch.Event</span></code></a>) – The ending event has been recorded.</p>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>Time between starting and ending event in milliseconds.</p>
</dd>
<dt class="field-odd">Return type</dt>
<dd class="field-odd"><p><a class="reference external" href="https://docs.python.org/3/library/functions.html#float" title="(in Python v3.13)">float</a></p>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">s_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Stream</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">e1_cuda</span> <span class="o">=</span> <span class="n">s_cuda</span><span class="o">.</span><span class="n">record_event</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">e2_cuda</span> <span class="o">=</span> <span class="n">s_cuda</span><span class="o">.</span><span class="n">record_event</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">ms</span> <span class="o">=</span> <span class="n">e1_cuda</span><span class="o">.</span><span class="n">elapsed_time</span><span class="p">(</span><span class="n">e2_cuda</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="torch.Event.query">
<span class="sig-name descname"><span class="pre">query</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.13)"><span class="pre">bool</span></a></span></span><a class="headerlink" href="#torch.Event.query" title="Permalink to this definition">¶</a></dt>
<dd><p>Check if the stream where this event was recorded already moved past the point where the event was recorded.
Always returns <code class="docutils literal notranslate"><span class="pre">True</span></code> if the Event was not recorded.</p>
<dl class="field-list simple">
<dt class="field-odd">Returns</dt>
<dd class="field-odd"><p>A boolean indicating if all work currently captured by event has completed.</p>
</dd>
<dt class="field-even">Return type</dt>
<dd class="field-even"><p><a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.13)">bool</a></p>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">s_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Stream</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">e_cuda</span> <span class="o">=</span> <span class="n">s_cuda</span><span class="o">.</span><span class="n">record_event</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">e_cuda</span><span class="o">.</span><span class="n">query</span><span class="p">()</span>
<span class="go">True</span>
</pre></div>
</div>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="torch.Event.record">
<span class="sig-name descname"><span class="pre">record</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">stream</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.13)"><span class="pre">None</span></a></span></span><a class="headerlink" href="#torch.Event.record" title="Permalink to this definition">¶</a></dt>
<dd><p>Record the event in a given stream. The stream’s device must match the event’s device.
This function is equivalent to <code class="docutils literal notranslate"><span class="pre">stream.record_event(self)</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>stream</strong> (<a class="reference internal" href="torch.Stream.html#torch.Stream" title="torch.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">torch.Stream</span></code></a>, optional) – A stream to be recorded.</p></li>
<li><p><strong>given</strong> (<em>If not</em>) – </p></li>
<li><p><strong>used.</strong> (<em>the current stream will be</em>) – </p></li>
</ul>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">e_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Event</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">e_cuda</span><span class="o">.</span><span class="n">record</span><span class="p">()</span>
</pre></div>
</div>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="torch.Event.synchronize">
<span class="sig-name descname"><span class="pre">synchronize</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.13)"><span class="pre">None</span></a></span></span><a class="headerlink" href="#torch.Event.synchronize" title="Permalink to this definition">¶</a></dt>
<dd><p>Wait for the event to complete. This prevents the CPU thread from proceeding until the event completes.</p>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">s_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Stream</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">e_cuda</span> <span class="o">=</span> <span class="n">s_cuda</span><span class="o">.</span><span class="n">record_event</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">e_cuda</span><span class="o">.</span><span class="n">synchronize</span><span class="p">()</span>
</pre></div>
</div>
</dd></dl>
<dl class="py method">
<dt class="sig sig-object py" id="torch.Event.wait">
<span class="sig-name descname"><span class="pre">wait</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">stream</span></span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">→</span> <span class="sig-return-typehint"><a class="reference external" href="https://docs.python.org/3/library/constants.html#None" title="(in Python v3.13)"><span class="pre">None</span></a></span></span><a class="headerlink" href="#torch.Event.wait" title="Permalink to this definition">¶</a></dt>
<dd><p>Make all future work submitted to the given stream wait for this event.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>stream</strong> (<a class="reference internal" href="torch.Stream.html#torch.Stream" title="torch.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">torch.Stream</span></code></a>, optional) – A stream to synchronize.</p></li>
<li><p><strong>given</strong> (<em>If not</em>) – </p></li>
<li><p><strong>used.</strong> (<em>the current stream will be</em>) – </p></li>
</ul>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">s1_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Stream</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">s2_cuda</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">Stream</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="s1">'cuda'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">e_cuda</span> <span class="o">=</span> <span class="n">s1_cuda</span><span class="o">.</span><span class="n">record</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">e_cuda</span><span class="o">.</span><span class="n">wait</span><span class="p">(</span><span class="n">s2</span><span class="p">)</span>
</pre></div>
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