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<section id="other-data-structures">
<h1>Other Data Structures<a class="headerlink" href="#other-data-structures" title="Link to this heading">#</a></h1>
<p>Our <a class="reference external" href="https://github.com/apache/arrow/tree/main/format">Flatbuffers protocol definition files</a> have metadata for some other data
structures defined to allow other kinds of applications to take advantage of
common interprocess communication machinery. These data structures are not
considered to be part of the columnar format.</p>
<p>An Arrow columnar implementation is not required to implement these
types.</p>
<section id="tensor-multi-dimensional-array">
<h2>Tensor (Multi-dimensional Array)<a class="headerlink" href="#tensor-multi-dimensional-array" title="Link to this heading">#</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Tensor</span></code> message types provides a way to write a
multidimensional array of fixed-size values (such as a NumPy ndarray).</p>
<p>When writing a standalone encapsulated tensor message, we use the
encapsulated IPC format defined in the <a class="reference internal" href="Columnar.html#format-columnar"><span class="std std-ref">Columnar Specification</span></a>, but additionally align the starting offset of the
tensor body to be a multiple of 64 bytes:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="n">metadata</span> <span class="n">prefix</span> <span class="ow">and</span> <span class="n">metadata</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">PADDING</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">tensor</span> <span class="n">body</span><span class="o">&gt;</span>
</pre></div>
</div>
</section>
<section id="sparse-tensor">
<h2>Sparse Tensor<a class="headerlink" href="#sparse-tensor" title="Link to this heading">#</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">SparseTensor</span></code> represents a multidimensional array whose elements
are generally almost all zeros.</p>
<p>When writing a standalone encapsulated sparse tensor message, we use
the encapsulated IPC format defined in the <a class="reference internal" href="Columnar.html#format-columnar"><span class="std std-ref">Columnar Specification</span></a>, but additionally align the starting offsets of the
sparse index and the sparse tensor body (if writing to a shared memory
region) to be multiples of 64 bytes:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="n">metadata</span> <span class="n">prefix</span> <span class="ow">and</span> <span class="n">metadata</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">PADDING</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">sparse</span> <span class="n">index</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">PADDING</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">sparse</span> <span class="n">tensor</span> <span class="n">body</span><span class="o">&gt;</span>
</pre></div>
</div>
<p>The contents of the sparse tensor index depends on what kind of sparse
format is used.</p>
</section>
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