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<div class="section" id="torch-nn-utils-rnn-pack-sequence">
<h1>torch.nn.utils.rnn.pack_sequence<a class="headerlink" href="#torch-nn-utils-rnn-pack-sequence" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="torch.nn.utils.rnn.pack_sequence">
<code class="sig-prename descclassname">torch.nn.utils.rnn.</code><code class="sig-name descname">pack_sequence</code><span class="sig-paren">(</span><em class="sig-param">sequences</em>, <em class="sig-param">enforce_sorted=True</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/torch/nn/utils/rnn.html#pack_sequence"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.nn.utils.rnn.pack_sequence" title="Permalink to this definition">¶</a></dt>
<dd><p>Packs a list of variable length Tensors</p>
<p><code class="docutils literal notranslate"><span class="pre">sequences</span></code> should be a list of Tensors of size <code class="docutils literal notranslate"><span class="pre">L</span> <span class="pre">x</span> <span class="pre">*</span></code>, where <cite>L</cite> is
the length of a sequence and <cite>*</cite> is any number of trailing dimensions,
including zero.</p>
<p>For unsorted sequences, use <cite>enforce_sorted = False</cite>. If <code class="docutils literal notranslate"><span class="pre">enforce_sorted</span></code>
is <code class="docutils literal notranslate"><span class="pre">True</span></code>, the sequences should be sorted in the order of decreasing length.
<code class="docutils literal notranslate"><span class="pre">enforce_sorted</span> <span class="pre">=</span> <span class="pre">True</span></code> is only necessary for ONNX export.</p>
<p class="rubric">Example</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">torch.nn.utils.rnn</span> <span class="kn">import</span> <span class="n">pack_sequence</span>
<span class="gp">>>> </span><span class="n">a</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">tensor</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">])</span>
<span class="gp">>>> </span><span class="n">b</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">tensor</span><span class="p">([</span><span class="mi">4</span><span class="p">,</span><span class="mi">5</span><span class="p">])</span>
<span class="gp">>>> </span><span class="n">c</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">tensor</span><span class="p">([</span><span class="mi">6</span><span class="p">])</span>
<span class="gp">>>> </span><span class="n">pack_sequence</span><span class="p">([</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="p">])</span>
<span class="go">PackedSequence(data=tensor([ 1, 4, 6, 2, 5, 3]), batch_sizes=tensor([ 3, 2, 1]))</span>
</pre></div>
</div>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>sequences</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#list" title="(in Python v3.9)"><em>list</em></a><em>[</em><a class="reference internal" href="../tensors.html#torch.Tensor" title="torch.Tensor"><em>Tensor</em></a><em>]</em>) – A list of sequences of decreasing length.</p></li>
<li><p><strong>enforce_sorted</strong> (<a class="reference external" href="https://docs.python.org/3/library/functions.html#bool" title="(in Python v3.9)"><em>bool</em></a><em>, </em><em>optional</em>) – if <code class="docutils literal notranslate"><span class="pre">True</span></code>, checks that the input
contains sequences sorted by length in a decreasing order. If
<code class="docutils literal notranslate"><span class="pre">False</span></code>, this condition is not checked. Default: <code class="docutils literal notranslate"><span class="pre">True</span></code>.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>a <a class="reference internal" href="torch.nn.utils.rnn.PackedSequence.html#torch.nn.utils.rnn.PackedSequence" title="torch.nn.utils.rnn.PackedSequence"><code class="xref py py-class docutils literal notranslate"><span class="pre">PackedSequence</span></code></a> object</p>
</dd>
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