code>(<strong><code>data_source</code></strong>, <strong><code>n_episodes</code></strong>, <strong><code>sequence_len</code></strong>, <strong><code>n_sequences</code></strong>, <strong><code>info_df</code></strong>, <strong><code>nburned</code></strong>=<em><code>100</code></em>) :: <code>Sampler</code></p>
</blockquote>
<p>Base class for all Samplers.</p>
<p>Every Sampler subclass has to provide an :meth:<code>__iter__</code> method, providing a
way to iterate over indices of dataset elements, and a :meth