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<h1>Source code for torch.accelerator</h1><div class="highlight"><pre>
<span></span><span class="sa">r</span><span class="sd">"""</span>
<span class="sd">This package introduces support for the current :ref:`accelerator<accelerators>` in python.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">typing_extensions</span> <span class="kn">import</span> <span class="n">deprecated</span>
<span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">from</span> <span class="nn">._utils</span> <span class="kn">import</span> <span class="n">_device_t</span><span class="p">,</span> <span class="n">_get_device_index</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span>
<span class="s2">"current_accelerator"</span><span class="p">,</span>
<span class="s2">"current_device_idx"</span><span class="p">,</span> <span class="c1"># deprecated</span>
<span class="s2">"current_device_index"</span><span class="p">,</span>
<span class="s2">"current_stream"</span><span class="p">,</span>
<span class="s2">"device_count"</span><span class="p">,</span>
<span class="s2">"is_available"</span><span class="p">,</span>
<span class="s2">"set_device_idx"</span><span class="p">,</span> <span class="c1"># deprecated</span>
<span class="s2">"set_device_index"</span><span class="p">,</span>
<span class="s2">"set_stream"</span><span class="p">,</span>
<span class="s2">"synchronize"</span><span class="p">,</span>
<span class="p">]</span>
<div class="viewcode-block" id="device_count"><a class="viewcode-back" href="../../generated/torch.accelerator.device_count.html#torch.accelerator.device_count">[docs]</a><span class="k">def</span> <span class="nf">device_count</span><span class="p">()</span> <span class="o">-></span> <span class="nb">int</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Return the number of current :ref:`accelerator<accelerators>` available.</span>
<span class="sd"> Returns:</span>
<span class="sd"> int: the number of the current :ref:`accelerator<accelerators>` available.</span>
<span class="sd"> If there is no available accelerators, return 0.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_deviceCount</span><span class="p">()</span></div>
<div class="viewcode-block" id="is_available"><a class="viewcode-back" href="../../generated/torch.accelerator.is_available.html#torch.accelerator.is_available">[docs]</a><span class="k">def</span> <span class="nf">is_available</span><span class="p">()</span> <span class="o">-></span> <span class="nb">bool</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Check if there is an available :ref:`accelerator<accelerators>`.</span>
<span class="sd"> Returns:</span>
<span class="sd"> bool: A boolean indicating if there is an available :ref:`accelerator<accelerators>`.</span>
<span class="sd"> Example::</span>
<span class="sd"> >>> assert torch.accelerator.is_available() "No available accelerators detected."</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">device_count</span><span class="p">()</span> <span class="o">></span> <span class="mi">0</span></div>
<div class="viewcode-block" id="current_accelerator"><a class="viewcode-back" href="../../generated/torch.accelerator.current_accelerator.html#torch.accelerator.current_accelerator">[docs]</a><span class="k">def</span> <span class="nf">current_accelerator</span><span class="p">()</span> <span class="o">-></span> <span class="n">torch</span><span class="o">.</span><span class="n">device</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Return the device of the current :ref:`accelerator<accelerators>`.</span>
<span class="sd"> Returns:</span>
<span class="sd"> torch.device: return the current accelerator as :class:`torch.device`.</span>
<span class="sd"> .. note:: The index of the returned :class:`torch.device` will be ``None``, please use</span>
<span class="sd"> :func:`torch.accelerator.current_device_index` to know the current index being used.</span>
<span class="sd"> And ensure to use :func:`torch.accelerator.is_available` to check if there is an available</span>
<span class="sd"> accelerator. If there is no available accelerator, this function will raise an exception.</span>
<span class="sd"> Example::</span>
<span class="sd"> >>> # xdoctest:</span>
<span class="sd"> >>> if torch.accelerator.is_available():</span>
<span class="sd"> >>> current_device = torch.accelerator.current_accelerator()</span>
<span class="sd"> >>> else:</span>
<span class="sd"> >>> current_device = torch.device("cpu")</span>
<span class="sd"> >>> if current_device.type == 'cuda':</span>
<span class="sd"> >>> is_half_supported = torch.cuda.has_half</span>
<span class="sd"> >>> elif current_device.type == 'xpu':</span>
<span class="sd"> >>> is_half_supported = torch.xpu.get_device_properties().has_fp16</span>
<span class="sd"> >>> elif current_device.type == 'cpu':</span>
<span class="sd"> >>> is_half_supported = True</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_getAccelerator</span><span class="p">()</span></div>
<div class="viewcode-block" id="current_device_index"><a class="viewcode-back" href="../../generated/torch.accelerator.current_device_index.html#torch.accelerator.current_device_index">[docs]</a><span class="k">def</span> <span class="nf">current_device_index</span><span class="p">()</span> <span class="o">-></span> <span class="nb">int</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Return the index of a currently selected device for the current :ref:`accelerator<accelerators>`.</span>
<span class="sd"> Returns:</span>
<span class="sd"> int: the index of a currently selected device.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_getDeviceIndex</span><span class="p">()</span></div>
<span class="n">current_device_idx</span> <span class="o">=</span> <span class="n">deprecated</span><span class="p">(</span>
<span class="s2">"Use `current_device_index` instead."</span><span class="p">,</span>
<span class="n">category</span><span class="o">=</span><span class="ne">FutureWarning</span><span class="p">,</span>
<span class="p">)(</span><span class="n">current_device_index</span><span class="p">)</span>
<div class="viewcode-block" id="set_device_index"><a class="viewcode-back" href="../../generated/torch.accelerator.set_device_index.html#torch.accelerator.set_device_index">[docs]</a><span class="k">def</span> <span class="nf">set_device_index</span><span class="p">(</span><span class="n">device</span><span class="p">:</span> <span class="n">_device_t</span><span class="p">,</span> <span class="o">/</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Set the current device index to a given device.</span>
<span class="sd"> Args:</span>
<span class="sd"> device (:class:`torch.device`, str, int): a given device that must match the current</span>
<span class="sd"> :ref:`accelerator<accelerators>` device type.</span>
<span class="sd"> .. note:: This function is a no-op if this device index is negative.</span>
<span class="sd"> """</span>
<span class="n">device_index</span> <span class="o">=</span> <span class="n">_get_device_index</span><span class="p">(</span><span class="n">device</span><span class="p">)</span>
<span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_setDeviceIndex</span><span class="p">(</span><span class="n">device_index</span><span class="p">)</span></div>
<span class="n">set_device_idx</span> <span class="o">=</span> <span class="n">deprecated</span><span class="p">(</span>
<span class="s2">"Use `set_device_index` instead."</span><span class="p">,</span>
<span class="n">category</span><span class="o">=</span><span class="ne">FutureWarning</span><span class="p">,</span>
<span class="p">)(</span><span class="n">set_device_index</span><span class="p">)</span>
<div class="viewcode-block" id="current_stream"><a class="viewcode-back" href="../../generated/torch.accelerator.current_stream.html#torch.accelerator.current_stream">[docs]</a><span class="k">def</span> <span class="nf">current_stream</span><span class="p">(</span><span class="n">device</span><span class="p">:</span> <span class="n">_device_t</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="o">/</span><span class="p">)</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="w"> </span><span class="sa">r</span><span class="sd">"""Return the currently selected stream for a given device.</span>
<span class="sd"> Args:</span>
<span class="sd"> device (:class:`torch.device`, str, int, optional): a given device that must match the current</span>
<span class="sd"> :ref:`accelerator<accelerators>` device type. If not given,</span>
<span class="sd"> use :func:`torch.accelerator.current_device_index` by default.</span>
<span class="sd"> Returns:</span>
<span class="sd"> torch.Stream: the currently selected stream for a given device.</span>
<span class="sd"> """</span>
<span class="n">device_index</span> <span class="o">=</span> <span class="n">_get_device_index</span><span class="p">(</span><span class="n">device</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
<span class="k">return</span> <span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_getStream</span><span class="p">(</span><span class="n">device_index</span><span class="p">)</span></div>
<div class="viewcode-block" id="set_stream"><a class="viewcode-back" href="../../generated/torch.accelerator.set_stream.html#torch.accelerator.set_stream">[docs]</a><span class="k">def</span> <span class="nf">set_stream</span><span class="p">(</span><span class="n">stream</span><span class="p">:</span> <span class="n">torch</span><span class="o">.</span><span class="n">Stream</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Set the current stream to a given stream.</span>
<span class="sd"> Args:</span>
<span class="sd"> stream (torch.Stream): a given stream that must match the current :ref:`accelerator<accelerators>` device type.</span>
<span class="sd"> .. note:: This function will set the current device index to the device index of the given stream.</span>
<span class="sd"> """</span>
<span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_setStream</span><span class="p">(</span><span class="n">stream</span><span class="p">)</span></div>
<div class="viewcode-block" id="synchronize"><a class="viewcode-back" href="../../generated/torch.accelerator.synchronize.html#torch.accelerator.synchronize">[docs]</a><span class="k">def</span> <span class="nf">synchronize</span><span class="p">(</span><span class="n">device</span><span class="p">:</span> <span class="n">_device_t</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="o">/</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sa">r</span><span class="sd">"""Wait for all kernels in all streams on the given device to complete.</span>
<span class="sd"> Args:</span>
<span class="sd"> device (:class:`torch.device`, str, int, optional): device for which to synchronize. It must match</span>
<span class="sd"> the current :ref:`accelerator<accelerators>` device type. If not given,</span>
<span class="sd"> use :func:`torch.accelerator.current_device_index` by default.</span>
<span class="sd"> .. note:: This function is a no-op if the current :ref:`accelerator<accelerators>` is not initialized.</span>
<span class="sd"> Example::</span>
<span class="sd"> >>> # xdoctest: +REQUIRES(env:TORCH_DOCTEST_CUDA)</span>
<span class="sd"> >>> assert torch.accelerator.is_available() "No available accelerators detected."</span>
<span class="sd"> >>> start_event = torch.Event(enable_timing=True)</span>
<span class="sd"> >>> end_event = torch.Event(enable_timing=True)</span>
<span class="sd"> >>> start_event.record()</span>
<span class="sd"> >>> tensor = torch.randn(100, device=torch.accelerator.current_accelerator())</span>
<span class="sd"> >>> sum = torch.sum(tensor)</span>
<span class="sd"> >>> end_event.record()</span>
<span class="sd"> >>> torch.accelerator.synchronize()</span>
<span class="sd"> >>> elapsed_time_ms = start_event.elapsed_time(end_event)</span>
<span class="sd"> """</span>
<span class="n">device_index</span> <span class="o">=</span> <span class="n">_get_device_index</span><span class="p">(</span><span class="n">device</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
<span class="n">torch</span><span class="o">.</span><span class="n">_C</span><span class="o">.</span><span class="n">_accelerator_synchronizeDevice</span><span class="p">(</span><span class="n">device_index</span><span class="p">)</span></div>
</pre></div>
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