an><span class="keyword">val</span> shape_to_str : <span><span><span><span>int array</span> option</span> array</span> <span class="arrow">&#45;&gt;</span></span> string</span></code></div><div class="spec-doc"><p>helper function; return the input array in string format.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-node_to_str"><a href="#val-node_to_str" class="anchor"></a><code><span><span class="keyword">val</span> node_to_str : <span><span><a href="Shape/Type/index.html#