n><span class="constructor">Batch</span> <span class="keyword">of</span> int</span></code></li><li id="type-typ.Epoch" class="def variant constructor anchored"><a href="#type-typ.Epoch" class="anchor"></a><code><span>| </span><span><span class="constructor">Epoch</span> <span class="keyword">of</span> float</span></code></li><li id="type-typ.Custom" class="def variant constructor anchored"><a href="#type-typ.Custom" class="anchor"></a><code><span>| </span><span><span class="constructor">Custom</span> <span 