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<div class="section" id="module-torch.cuda">
<span id="torch-cuda"></span><h1>torch.cuda<a class="headerlink" href="#module-torch.cuda" title="Permalink to this headline">¶</a></h1>
<p>This package adds support for CUDA tensor types, that implement the same
function as CPU tensors, but they utilize GPUs for computation.</p>
<p>It is lazily initialized, so you can always import it, and use
<a class="reference internal" href="#torch.cuda.is_available" title="torch.cuda.is_available"><code class="xref py py-func docutils literal notranslate"><span class="pre">is_available()</span></code></a> to determine if your system supports CUDA.</p>
<p><a class="reference internal" href="notes/cuda.html#cuda-semantics"><span class="std std-ref">CUDA semantics</span></a> has more details about working with CUDA.</p>
<dl class="function">
<dt id="torch.cuda.current_blas_handle">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">current_blas_handle</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#current_blas_handle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.current_blas_handle" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns cublasHandle_t pointer to current cuBLAS handle</p>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.current_device">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">current_device</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#current_device"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.current_device" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the index of a currently selected device.</p>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.current_stream">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">current_stream</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#current_stream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.current_stream" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the currently selected <a class="reference internal" href="#torch.cuda.Stream" title="torch.cuda.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">Stream</span></code></a> for a given device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
the currently selected <a class="reference internal" href="#torch.cuda.Stream" title="torch.cuda.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">Stream</span></code></a> for the current device, given
by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>, if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code>
(default).</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.default_stream">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">default_stream</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#default_stream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.default_stream" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the default <a class="reference internal" href="#torch.cuda.Stream" title="torch.cuda.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">Stream</span></code></a> for a given device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
the default <a class="reference internal" href="#torch.cuda.Stream" title="torch.cuda.Stream"><code class="xref py py-class docutils literal notranslate"><span class="pre">Stream</span></code></a> for the current device, given by
<a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>, if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code>
(default).</p>
</dd>
</dl>
</dd></dl>
<dl class="class">
<dt id="torch.cuda.device">
<em class="property">class </em><code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">device</code><span class="sig-paren">(</span><em class="sig-param">device</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#device"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.device" title="Permalink to this definition">¶</a></dt>
<dd><p>Context-manager that changes the selected device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a>) – device index to select. It’s a no-op if
this argument is a negative integer or <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.device_count">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">device_count</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#device_count"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.device_count" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the number of GPUs available.</p>
</dd></dl>
<dl class="class">
<dt id="torch.cuda.device_of">
<em class="property">class </em><code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">device_of</code><span class="sig-paren">(</span><em class="sig-param">obj</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#device_of"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.device_of" title="Permalink to this definition">¶</a></dt>
<dd><p>Context-manager that changes the current device to that of given object.</p>
<p>You can use both tensors and storages as arguments. If a given object is
not allocated on a GPU, this is a no-op.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>obj</strong> (<a class="reference internal" href="tensors.html#torch.Tensor" title="torch.Tensor"><em>Tensor</em></a><em> or </em><em>Storage</em>) – object allocated on the selected device.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.empty_cache">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">empty_cache</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#empty_cache"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.empty_cache" title="Permalink to this definition">¶</a></dt>
<dd><p>Releases all unoccupied cached memory currently held by the caching
allocator so that those can be used in other GPU application and visible in
<cite>nvidia-smi</cite>.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p><a class="reference internal" href="#torch.cuda.empty_cache" title="torch.cuda.empty_cache"><code class="xref py py-func docutils literal notranslate"><span class="pre">empty_cache()</span></code></a> doesn’t increase the amount of GPU
memory available for PyTorch. See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for
more details about GPU memory management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.get_device_capability">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">get_device_capability</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#get_device_capability"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.get_device_capability" title="Permalink to this definition">¶</a></dt>
<dd><p>Gets the cuda capability of a device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – device for which to return the
device capability. This function is a no-op if this argument is
a negative integer. It uses the current device, given by
<a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>, if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code>
(default).</p>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>the major and minor cuda capability of the device</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/stdtypes.html#tuple" title="(in Python v3.7)">tuple</a>(<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)">int</a>, <a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)">int</a>)</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.get_device_name">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">get_device_name</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#get_device_name"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.get_device_name" title="Permalink to this definition">¶</a></dt>
<dd><p>Gets the name of a device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – device for which to return the
name. This function is a no-op if this argument is a negative
integer. It uses the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.init">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">init</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#init"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.init" title="Permalink to this definition">¶</a></dt>
<dd><p>Initialize PyTorch’s CUDA state. You may need to call
this explicitly if you are interacting with PyTorch via
its C API, as Python bindings for CUDA functionality will not
be until this initialization takes place. Ordinary users
should not need this, as all of PyTorch’s CUDA methods
automatically initialize CUDA state on-demand.</p>
<p>Does nothing if the CUDA state is already initialized.</p>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.ipc_collect">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">ipc_collect</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#ipc_collect"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.ipc_collect" title="Permalink to this definition">¶</a></dt>
<dd><p>Force collects GPU memory after it has been released by CUDA IPC.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Checks if any sent CUDA tensors could be cleaned from the memory. Force
closes shared memory file used for reference counting if there is no
active counters. Useful when the producer process stopped actively sending
tensors and want to release unused memory.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.is_available">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">is_available</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#is_available"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.is_available" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a bool indicating if CUDA is currently available.</p>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.max_memory_allocated">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">max_memory_allocated</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#max_memory_allocated"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.max_memory_allocated" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the maximum GPU memory occupied by tensors in bytes for a given
device.</p>
<p>By default, this returns the peak allocated memory since the beginning of
this program. <a class="reference internal" href="#torch.cuda.reset_max_memory_allocated" title="torch.cuda.reset_max_memory_allocated"><code class="xref py py-func docutils literal notranslate"><span class="pre">reset_max_memory_allocated()</span></code></a> can be used to
reset the starting point in tracking this metric. For example, these two
functions can measure the peak allocated memory usage of each iteration in a
training loop.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
statistic for the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for more details about GPU memory
management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.max_memory_cached">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">max_memory_cached</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#max_memory_cached"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.max_memory_cached" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the maximum GPU memory managed by the caching allocator in bytes
for a given device.</p>
<p>By default, this returns the peak cached memory since the beginning of this
program. <a class="reference internal" href="#torch.cuda.reset_max_memory_cached" title="torch.cuda.reset_max_memory_cached"><code class="xref py py-func docutils literal notranslate"><span class="pre">reset_max_memory_cached()</span></code></a> can be used to reset
the starting point in tracking this metric. For example, these two functions
can measure the peak cached memory amount of each iteration in a training
loop.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
statistic for the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for more details about GPU memory
management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.memory_allocated">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">memory_allocated</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#memory_allocated"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.memory_allocated" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the current GPU memory occupied by tensors in bytes for a given
device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
statistic for the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This is likely less than the amount shown in <cite>nvidia-smi</cite> since some
unused memory can be held by the caching allocator and some context
needs to be created on GPU. See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for more
details about GPU memory management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.memory_cached">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">memory_cached</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#memory_cached"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.memory_cached" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the current GPU memory managed by the caching allocator in bytes
for a given device.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
statistic for the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for more details about GPU memory
management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.reset_max_memory_allocated">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">reset_max_memory_allocated</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#reset_max_memory_allocated"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.reset_max_memory_allocated" title="Permalink to this definition">¶</a></dt>
<dd><p>Resets the starting point in tracking maximum GPU memory occupied by
tensors for a given device.</p>
<p>See <a class="reference internal" href="#torch.cuda.max_memory_allocated" title="torch.cuda.max_memory_allocated"><code class="xref py py-func docutils literal notranslate"><span class="pre">max_memory_allocated()</span></code></a> for details.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
statistic for the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for more details about GPU memory
management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.reset_max_memory_cached">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">reset_max_memory_cached</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#reset_max_memory_cached"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.reset_max_memory_cached" title="Permalink to this definition">¶</a></dt>
<dd><p>Resets the starting point in tracking maximum GPU memory managed by the
caching allocator for a given device.</p>
<p>See <a class="reference internal" href="#torch.cuda.max_memory_cached" title="torch.cuda.max_memory_cached"><code class="xref py py-func docutils literal notranslate"><span class="pre">max_memory_cached()</span></code></a> for details.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – selected device. Returns
statistic for the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>See <a class="reference internal" href="notes/cuda.html#cuda-memory-management"><span class="std std-ref">Memory management</span></a> for more details about GPU memory
management.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.set_device">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">set_device</code><span class="sig-paren">(</span><em class="sig-param">device</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#set_device"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.set_device" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the current device.</p>
<p>Usage of this function is discouraged in favor of <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref any py py-class docutils literal notranslate"><span class="pre">device</span></code></a>. In most
cases it’s better to use <code class="docutils literal notranslate"><span class="pre">CUDA_VISIBLE_DEVICES</span></code> environmental variable.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a>) – selected device. This function is a no-op
if this argument is negative.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.stream">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">stream</code><span class="sig-paren">(</span><em class="sig-param">stream</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#stream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.stream" title="Permalink to this definition">¶</a></dt>
<dd><p>Context-manager that selects a given stream.</p>
<p>All CUDA kernels queued within its context will be enqueued on a selected
stream.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>stream</strong> (<a class="reference internal" href="#torch.cuda.Stream" title="torch.cuda.Stream"><em>Stream</em></a>) – selected stream. This manager is a no-op if it’s
<code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Streams are per-device. If the selected stream is not on the
current device, this function will also change the current device to
match the stream.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.synchronize">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">synchronize</code><span class="sig-paren">(</span><em class="sig-param">device=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda.html#synchronize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.synchronize" title="Permalink to this definition">¶</a></dt>
<dd><p>Waits for all kernels in all streams on a CUDA device to complete.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – device for which to synchronize.
It uses the current device, given by <a class="reference internal" href="#torch.cuda.current_device" title="torch.cuda.current_device"><code class="xref py py-func docutils literal notranslate"><span class="pre">current_device()</span></code></a>,
if <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default).</p>
</dd>
</dl>
</dd></dl>
<div class="section" id="random-number-generator">
<h2>Random Number Generator<a class="headerlink" href="#random-number-generator" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="torch.cuda.get_rng_state">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">get_rng_state</code><span class="sig-paren">(</span><em class="sig-param">device='cuda'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#get_rng_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.get_rng_state" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the random number generator state of the specified GPU as a ByteTensor.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – The device to return the RNG state of.
Default: <code class="docutils literal notranslate"><span class="pre">'cuda'</span></code> (i.e., <code class="docutils literal notranslate"><span class="pre">torch.device('cuda')</span></code>, the current CUDA device).</p>
</dd>
</dl>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This function eagerly initializes CUDA.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.get_rng_state_all">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">get_rng_state_all</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#get_rng_state_all"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.get_rng_state_all" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a tuple of ByteTensor representing the random number states of all devices.</p>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.set_rng_state">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">set_rng_state</code><span class="sig-paren">(</span><em class="sig-param">new_state</em>, <em class="sig-param">device='cuda'</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#set_rng_state"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.set_rng_state" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the random number generator state of the specified GPU.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>new_state</strong> (<em>torch.ByteTensor</em>) – The desired state</p></li>
<li><p><strong>device</strong> (<a class="reference internal" href="tensor_attributes.html#torch.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – The device to set the RNG state.
Default: <code class="docutils literal notranslate"><span class="pre">'cuda'</span></code> (i.e., <code class="docutils literal notranslate"><span class="pre">torch.device('cuda')</span></code>, the current CUDA device).</p></li>
</ul>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.set_rng_state_all">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">set_rng_state_all</code><span class="sig-paren">(</span><em class="sig-param">new_states</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#set_rng_state_all"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.set_rng_state_all" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the random number generator state of all devices.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>new_state</strong> (<em>tuple of torch.ByteTensor</em>) – The desired state for each device</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.manual_seed">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">manual_seed</code><span class="sig-paren">(</span><em class="sig-param">seed</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#manual_seed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.manual_seed" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the seed for generating random numbers for the current GPU.
It’s safe to call this function if CUDA is not available; in that
case, it is silently ignored.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>seed</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a>) – The desired seed.</p>
</dd>
</dl>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>If you are working with a multi-GPU model, this function is insufficient
to get determinism. To seed all GPUs, use <a class="reference internal" href="#torch.cuda.manual_seed_all" title="torch.cuda.manual_seed_all"><code class="xref py py-func docutils literal notranslate"><span class="pre">manual_seed_all()</span></code></a>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.manual_seed_all">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">manual_seed_all</code><span class="sig-paren">(</span><em class="sig-param">seed</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#manual_seed_all"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.manual_seed_all" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the seed for generating random numbers on all GPUs.
It’s safe to call this function if CUDA is not available; in that
case, it is silently ignored.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>seed</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a>) – The desired seed.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.seed">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">seed</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#seed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.seed" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the seed for generating random numbers to a random number for the current GPU.
It’s safe to call this function if CUDA is not available; in that
case, it is silently ignored.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>If you are working with a multi-GPU model, this function will only initialize
the seed on one GPU. To initialize all GPUs, use <a class="reference internal" href="#torch.cuda.seed_all" title="torch.cuda.seed_all"><code class="xref py py-func docutils literal notranslate"><span class="pre">seed_all()</span></code></a>.</p>
</div>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.seed_all">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">seed_all</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#seed_all"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.seed_all" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets the seed for generating random numbers to a random number on all GPUs.
It’s safe to call this function if CUDA is not available; in that
case, it is silently ignored.</p>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.initial_seed">
<code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">initial_seed</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/random.html#initial_seed"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.initial_seed" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the current random seed of the current GPU.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This function eagerly initializes CUDA.</p>
</div>
</dd></dl>
</div>
<div class="section" id="communication-collectives">
<h2>Communication collectives<a class="headerlink" href="#communication-collectives" title="Permalink to this headline">¶</a></h2>
<dl class="function">
<dt id="torch.cuda.comm.broadcast">
<code class="sig-prename descclassname">torch.cuda.comm.</code><code class="sig-name descname">broadcast</code><span class="sig-paren">(</span><em class="sig-param">tensor</em>, <em class="sig-param">devices</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/comm.html#broadcast"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.comm.broadcast" title="Permalink to this definition">¶</a></dt>
<dd><p>Broadcasts a tensor to a number of GPUs.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>tensor</strong> (<a class="reference internal" href="tensors.html#torch.Tensor" title="torch.Tensor"><em>Tensor</em></a>) – tensor to broadcast.</p></li>
<li><p><strong>devices</strong> (<em>Iterable</em>) – an iterable of devices among which to broadcast.
Note that it should be like (src, dst1, dst2, …), the first element
of which is the source device to broadcast from.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A tuple containing copies of the <code class="docutils literal notranslate"><span class="pre">tensor</span></code>, placed on devices
corresponding to indices from <code class="docutils literal notranslate"><span class="pre">devices</span></code>.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.comm.broadcast_coalesced">
<code class="sig-prename descclassname">torch.cuda.comm.</code><code class="sig-name descname">broadcast_coalesced</code><span class="sig-paren">(</span><em class="sig-param">tensors</em>, <em class="sig-param">devices</em>, <em class="sig-param">buffer_size=10485760</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/comm.html#broadcast_coalesced"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.comm.broadcast_coalesced" title="Permalink to this definition">¶</a></dt>
<dd><p>Broadcasts a sequence tensors to the specified GPUs.
Small tensors are first coalesced into a buffer to reduce the number
of synchronizations.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>tensors</strong> (<em>sequence</em>) – tensors to broadcast.</p></li>
<li><p><strong>devices</strong> (<em>Iterable</em>) – an iterable of devices among which to broadcast.
Note that it should be like (src, dst1, dst2, …), the first element
of which is the source device to broadcast from.</p></li>
<li><p><strong>buffer_size</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a>) – maximum size of the buffer used for coalescing</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A tuple containing copies of the <code class="docutils literal notranslate"><span class="pre">tensor</span></code>, placed on devices
corresponding to indices from <code class="docutils literal notranslate"><span class="pre">devices</span></code>.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.comm.reduce_add">
<code class="sig-prename descclassname">torch.cuda.comm.</code><code class="sig-name descname">reduce_add</code><span class="sig-paren">(</span><em class="sig-param">inputs</em>, <em class="sig-param">destination=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/comm.html#reduce_add"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.comm.reduce_add" title="Permalink to this definition">¶</a></dt>
<dd><p>Sums tensors from multiple GPUs.</p>
<p>All inputs should have matching shapes.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>inputs</strong> (<em>Iterable</em><em>[</em><a class="reference internal" href="tensors.html#torch.Tensor" title="torch.Tensor"><em>Tensor</em></a><em>]</em>) – an iterable of tensors to add.</p></li>
<li><p><strong>destination</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – a device on which the output will be
placed (default: current device).</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A tensor containing an elementwise sum of all inputs, placed on the
<code class="docutils literal notranslate"><span class="pre">destination</span></code> device.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.comm.scatter">
<code class="sig-prename descclassname">torch.cuda.comm.</code><code class="sig-name descname">scatter</code><span class="sig-paren">(</span><em class="sig-param">tensor</em>, <em class="sig-param">devices</em>, <em class="sig-param">chunk_sizes=None</em>, <em class="sig-param">dim=0</em>, <em class="sig-param">streams=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/comm.html#scatter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.comm.scatter" title="Permalink to this definition">¶</a></dt>
<dd><p>Scatters tensor across multiple GPUs.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>tensor</strong> (<a class="reference internal" href="tensors.html#torch.Tensor" title="torch.Tensor"><em>Tensor</em></a>) – tensor to scatter.</p></li>
<li><p><strong>devices</strong> (<em>Iterable</em><em>[</em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>]</em>) – iterable of ints, specifying among which
devices the tensor should be scattered.</p></li>
<li><p><strong>chunk_sizes</strong> (<em>Iterable</em><em>[</em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>]</em><em>, </em><em>optional</em>) – sizes of chunks to be placed on
each device. It should match <code class="docutils literal notranslate"><span class="pre">devices</span></code> in length and sum to
<code class="docutils literal notranslate"><span class="pre">tensor.size(dim)</span></code>. If not specified, the tensor will be divided
into equal chunks.</p></li>
<li><p><strong>dim</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – A dimension along which to chunk the tensor.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A tuple containing chunks of the <code class="docutils literal notranslate"><span class="pre">tensor</span></code>, spread across given
<code class="docutils literal notranslate"><span class="pre">devices</span></code>.</p>
</dd>
</dl>
</dd></dl>
<dl class="function">
<dt id="torch.cuda.comm.gather">
<code class="sig-prename descclassname">torch.cuda.comm.</code><code class="sig-name descname">gather</code><span class="sig-paren">(</span><em class="sig-param">tensors</em>, <em class="sig-param">dim=0</em>, <em class="sig-param">destination=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/comm.html#gather"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.comm.gather" title="Permalink to this definition">¶</a></dt>
<dd><p>Gathers tensors from multiple GPUs.</p>
<p>Tensor sizes in all dimension different than <code class="docutils literal notranslate"><span class="pre">dim</span></code> have to match.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>tensors</strong> (<em>Iterable</em><em>[</em><a class="reference internal" href="tensors.html#torch.Tensor" title="torch.Tensor"><em>Tensor</em></a><em>]</em>) – iterable of tensors to gather.</p></li>
<li><p><strong>dim</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a>) – a dimension along which the tensors will be concatenated.</p></li>
<li><p><strong>destination</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – output device (-1 means CPU, default:
current device)</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A tensor located on <code class="docutils literal notranslate"><span class="pre">destination</span></code> device, that is a result of
concatenating <code class="docutils literal notranslate"><span class="pre">tensors</span></code> along <code class="docutils literal notranslate"><span class="pre">dim</span></code>.</p>
</dd>
</dl>
</dd></dl>
</div>
<div class="section" id="streams-and-events">
<h2>Streams and events<a class="headerlink" href="#streams-and-events" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="torch.cuda.Stream">
<em class="property">class </em><code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">Stream</code><a class="reference internal" href="_modules/torch/cuda/streams.html#Stream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Stream" title="Permalink to this definition">¶</a></dt>
<dd><p>Wrapper around a CUDA stream.</p>
<p>A CUDA stream is a linear sequence of execution that belongs to a specific
device, independent from other streams. See <a class="reference internal" href="notes/cuda.html#cuda-semantics"><span class="std std-ref">CUDA semantics</span></a> for
details.</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.torch.device" title="torch.torch.device"><em>torch.device</em></a><em> or </em><a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – a device on which to allocate
the stream. If <a class="reference internal" href="#torch.cuda.device" title="torch.cuda.device"><code class="xref py py-attr docutils literal notranslate"><span class="pre">device</span></code></a> is <code class="docutils literal notranslate"><span class="pre">None</span></code> (default) or a negative
integer, this will use the current device.</p></li>
<li><p><strong>priority</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#int" title="(in Python v3.7)"><em>int</em></a><em>, </em><em>optional</em>) – priority of the stream. Lower numbers
represent higher priorities.</p></li>
</ul>
</dd>
</dl>
<dl class="method">
<dt id="torch.cuda.Stream.query">
<code class="sig-name descname">query</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Stream.query"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Stream.query" title="Permalink to this definition">¶</a></dt>
<dd><p>Checks if all the work submitted has been completed.</p>
<dl class="field-list simple">
<dt class="field-odd">Returns</dt>
<dd class="field-odd"><p>A boolean indicating if all kernels in this stream are completed.</p>
</dd>
</dl>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Stream.record_event">
<code class="sig-name descname">record_event</code><span class="sig-paren">(</span><em class="sig-param">event=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Stream.record_event"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Stream.record_event" title="Permalink to this definition">¶</a></dt>
<dd><p>Records an event.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>event</strong> (<a class="reference internal" href="#torch.cuda.Event" title="torch.cuda.Event"><em>Event</em></a><em>, </em><em>optional</em>) – event to record. If not given, a new one
will be allocated.</p>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>Recorded event.</p>
</dd>
</dl>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Stream.synchronize">
<code class="sig-name descname">synchronize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Stream.synchronize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Stream.synchronize" title="Permalink to this definition">¶</a></dt>
<dd><p>Wait for all the kernels in this stream to complete.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This is a wrapper around <code class="docutils literal notranslate"><span class="pre">cudaStreamSynchronize()</span></code>: see
<a href="#id4"><span class="problematic" id="id5">`CUDA documentation`_</span></a> for more info.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Stream.wait_event">
<code class="sig-name descname">wait_event</code><span class="sig-paren">(</span><em class="sig-param">event</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Stream.wait_event"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Stream.wait_event" title="Permalink to this definition">¶</a></dt>
<dd><p>Makes all future work submitted to the stream wait for an event.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>event</strong> (<a class="reference internal" href="#torch.cuda.Event" title="torch.cuda.Event"><em>Event</em></a>) – an event to wait for.</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This is a wrapper around <code class="docutils literal notranslate"><span class="pre">cudaStreamWaitEvent()</span></code>: see <a href="#id6"><span class="problematic" id="id7">`CUDA
documentation`_</span></a> for more info.</p>
<p>This function returns without waiting for <code class="xref py py-attr docutils literal notranslate"><span class="pre">event</span></code>: only future
operations are affected.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Stream.wait_stream">
<code class="sig-name descname">wait_stream</code><span class="sig-paren">(</span><em class="sig-param">stream</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Stream.wait_stream"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Stream.wait_stream" title="Permalink to this definition">¶</a></dt>
<dd><p>Synchronizes with another stream.</p>
<p>All future work submitted to this stream will wait until all kernels
submitted to a given stream at the time of call complete.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>stream</strong> (<a class="reference internal" href="#torch.cuda.Stream" title="torch.cuda.Stream"><em>Stream</em></a>) – a stream to synchronize.</p>
</dd>
</dl>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This function returns without waiting for currently enqueued
kernels in <a class="reference internal" href="#torch.cuda.stream" title="torch.cuda.stream"><code class="xref py py-attr docutils literal notranslate"><span class="pre">stream</span></code></a>: only future operations are affected.</p>
</div>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="torch.cuda.Event">
<em class="property">class </em><code class="sig-prename descclassname">torch.cuda.</code><code class="sig-name descname">Event</code><a class="reference internal" href="_modules/torch/cuda/streams.html#Event"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event" title="Permalink to this definition">¶</a></dt>
<dd><p>Wrapper around a CUDA event.</p>
<p>CUDA events are synchronization markers that can be used to monitor the
device’s progress, to accurately measure timing, and to synchronize CUDA
streams.</p>
<p>The underlying CUDA events are lazily initialized when the event is first
recorded or exported to another process. After creation, only streams on the
same device may record the event. However, streams on any device can wait on
the event.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>enable_timing</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.7)"><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>
<li><p><strong>blocking</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.7)"><em>bool</em></a><em>, </em><em>optional</em>) – if <code class="docutils literal notranslate"><span class="pre">True</span></code>, <a class="reference internal" href="#torch.cuda.Event.wait" title="torch.cuda.Event.wait"><code class="xref py py-meth docutils literal notranslate"><span class="pre">wait()</span></code></a> will be blocking (default: <code class="docutils literal notranslate"><span class="pre">False</span></code>)</p></li>
<li><p><strong>interprocess</strong> (<span class="target" id="id2"></span>) – if <code class="docutils literal notranslate"><span class="pre">True</span></code>, the event can be shared between processes
(default: <code class="docutils literal notranslate"><span class="pre">False</span></code>)</p></li>
</ul>
</dd>
</dl>
<dl class="method">
<dt id="torch.cuda.Event.elapsed_time">
<code class="sig-name descname">elapsed_time</code><span class="sig-paren">(</span><em class="sig-param">end_event</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.elapsed_time"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.elapsed_time" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the time elapsed in milliseconds after the event was
recorded and before the end_event was recorded.</p>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Event.from_ipc_handle">
<em class="property">classmethod </em><code class="sig-name descname">from_ipc_handle</code><span class="sig-paren">(</span><em class="sig-param">device</em>, <em class="sig-param">handle</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.from_ipc_handle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.from_ipc_handle" title="Permalink to this definition">¶</a></dt>
<dd><p>Reconstruct an event from an IPC handle on the given device.</p>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Event.ipc_handle">
<code class="sig-name descname">ipc_handle</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.ipc_handle"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.ipc_handle" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns an IPC handle of this event. If not recorded yet, the event
will use the current device.</p>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Event.query">
<code class="sig-name descname">query</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.query"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.query" title="Permalink to this definition">¶</a></dt>
<dd><p>Checks if all work currently captured by event has completed.</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>
</dl>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Event.record">
<code class="sig-name descname">record</code><span class="sig-paren">(</span><em class="sig-param">stream=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.record"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.record" title="Permalink to this definition">¶</a></dt>
<dd><p>Records the event in a given stream.</p>
<p>Uses <code class="docutils literal notranslate"><span class="pre">torch.cuda.current_stream()</span></code> if no stream is specified. The
stream’s device must match the event’s device.</p>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Event.synchronize">
<code class="sig-name descname">synchronize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.synchronize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.synchronize" title="Permalink to this definition">¶</a></dt>
<dd><p>Waits for the event to complete.</p>
<p>Waits until the completion of all work currently captured in this event.
This prevents the CPU thread from proceeding until the event completes.</p>
<blockquote>
<div><div class="admonition note">
<p class="admonition-title">Note</p>
<p>This is a wrapper around <code class="docutils literal notranslate"><span class="pre">cudaEventSynchronize()</span></code>: see <a href="#id8"><span class="problematic" id="id9">`CUDA
documentation`_</span></a> for more info.</p>
</div>
</div></blockquote>
</dd></dl>
<dl class="method">
<dt id="torch.cuda.Event.wait">
<code class="sig-name descname">wait</code><span class="sig-paren">(</span><em class="sig-param">stream=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/torch/cuda/streams.html#Event.wait"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.cuda.Event.wait" title="Permalink to this definition">¶</a></dt>
<dd><p>Makes all future work submitted to the given stream wait for this
event.</p>