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<section id="mlx-utils-tree-map">
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<h1>mlx.utils.tree_map<a class="headerlink" href="#mlx-utils-tree-map" title="Permalink to this heading"></a></h1>
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<dl class="py function">
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<dt class="sig sig-object py" id="mlx.utils.tree_map">
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<span class="sig-prename descclassname"><span class="pre">mlx.utils.</span></span><span class="sig-name descname"><span class="pre">tree_map</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">fn</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">tree</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">*</span></span><span class="n"><span class="pre">rest</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#mlx.utils.tree_map" title="Permalink to this definition"></a></dt>
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<dd><p>Applies <code class="docutils literal notranslate"><span class="pre">fn</span></code> to the leaves of the python tree <code class="docutils literal notranslate"><span class="pre">tree</span></code> and
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returns a new collection with the results.</p>
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<p>If <code class="docutils literal notranslate"><span class="pre">rest</span></code> is provided, every item is assumed to be a superset of <code class="docutils literal notranslate"><span class="pre">tree</span></code>
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and the corresponding leaves are provided as extra positional arguments to
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<code class="docutils literal notranslate"><span class="pre">fn</span></code>. In that respect, <a class="reference internal" href="#mlx.utils.tree_map" title="mlx.utils.tree_map"><code class="xref py py-meth docutils literal notranslate"><span class="pre">tree_map()</span></code></a> is closer to <a class="reference external" href="https://docs.python.org/3/library/itertools.html#itertools.starmap" title="(in Python v3.12)"><code class="xref py py-func docutils literal notranslate"><span class="pre">itertools.starmap()</span></code></a>
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than to <a class="reference external" href="https://docs.python.org/3/library/functions.html#map" title="(in Python v3.12)"><code class="xref py py-func docutils literal notranslate"><span class="pre">map()</span></code></a>.</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">mlx.nn</span> <span class="k">as</span> <span class="nn">nn</span>
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<span class="kn">from</span> <span class="nn">mlx.utils</span> <span class="kn">import</span> <span class="n">tree_map</span>
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<span class="n">model</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Linear</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">)</span>
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<span class="nb">print</span><span class="p">(</span><span class="n">model</span><span class="o">.</span><span class="n">parameters</span><span class="p">()</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span>
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<span class="c1"># dict_keys(['weight', 'bias'])</span>
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<span class="c1"># square the parameters</span>
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<span class="n">model</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">tree_map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="n">x</span><span class="o">*</span><span class="n">x</span><span class="p">,</span> <span class="n">model</span><span class="o">.</span><span class="n">parameters</span><span class="p">()))</span>
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</pre></div>
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<dl class="field-list simple">
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<dt class="field-odd">Parameters<span class="colon">:</span></dt>
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<dd class="field-odd"><ul class="simple">
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<li><p><strong>fn</strong> (<em>Callable</em>) – The function that processes the leaves of the tree</p></li>
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<li><p><strong>tree</strong> (<em>Any</em>) – The main python tree that will be iterated upon</p></li>
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<li><p><strong>rest</strong> (<em>Tuple</em><em>[</em><em>Any</em><em>]</em>) – Extra trees to be iterated together with tree</p></li>
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</ul>
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</dd>
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<dt class="field-even">Returns<span class="colon">:</span></dt>
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<dd class="field-even"><p>A python tree with the new values returned by <code class="docutils literal notranslate"><span class="pre">fn</span></code>.</p>
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