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<div class="section" id="torch-block-diag">
<h1>torch.block_diag<a class="headerlink" href="#torch-block-diag" title="Permalink to this headline">¶</a></h1>
<dl class="function">
<dt id="torch.block_diag">
<code class="sig-prename descclassname">torch.</code><code class="sig-name descname">block_diag</code><span class="sig-paren">(</span><em class="sig-param">*tensors</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/torch/functional.html#block_diag"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#torch.block_diag" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a block diagonal matrix from provided tensors.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><p><strong>*tensors</strong> – One or more tensors with 0, 1, or 2 dimensions.</p>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><dl class="simple">
<dt>A 2 dimensional tensor with all the input tensors arranged in</dt><dd><p>order such that their upper left and lower right corners are
diagonally adjacent. All other elements are set to 0.</p>
</dd>
</dl>
</p>
</dd>
<dt class="field-odd">Return type</dt>
<dd class="field-odd"><p><a class="reference internal" href="../tensors.html#torch.Tensor" title="torch.Tensor">Tensor</a></p>
</dd>
</dl>
<p>Example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">torch</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">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">],</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</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">3</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="p">[</span><span class="mi">6</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">8</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">7</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">D</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">E</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="p">[</span><span class="mi">5</span><span class="p">],</span> <span class="p">[</span><span class="mi">6</span><span class="p">]])</span>
<span class="gp">>>> </span><span class="n">torch</span><span class="o">.</span><span class="n">block_diag</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="n">D</span><span class="p">,</span> <span class="n">E</span><span class="p">)</span>
<span class="go">tensor([[0, 1, 0, 0, 0, 0, 0, 0, 0, 0],</span>
<span class="go"> [1, 0, 0, 0, 0, 0, 0, 0, 0, 0],</span>
<span class="go"> [0, 0, 3, 4, 5, 0, 0, 0, 0, 0],</span>
<span class="go"> [0, 0, 6, 7, 8, 0, 0, 0, 0, 0],</span>
<span class="go"> [0, 0, 0, 0, 0, 7, 0, 0, 0, 0],</span>
<span class="go"> [0, 0, 0, 0, 0, 0, 1, 2, 3, 0],</span>
<span class="go"> [0, 0, 0, 0, 0, 0, 0, 0, 0, 4],</span>
<span class="go"> [0, 0, 0, 0, 0, 0, 0, 0, 0, 5],</span>
<span class="go"> [0, 0, 0, 0, 0, 0, 0, 0, 0, 6]])</span>
</pre></div>
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</dd></dl>
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