ord">val</span> default : <span>unit <span class="arrow">&#45;&gt;</span></span> <a href="#type-typ">typ</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-config"><a href="#val-config" class="anchor"></a><code><span><span class="keyword">val</span> config : 
  <span><span class="optlabel">?batch</span>:<a href="../Batch/index.html#type-typ">Batch.typ</a> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="optlabel">?gradient</span>:<a href="../Gradient