div></div></div>
<p>
            To define properly datasets, the notion of <span class="bold"><strong>sample</strong></span>
            should be introduced first. A <span class="bold"><strong>sample</strong></span>
            is defined as <span class="emphasis"><em>polymorphic tuple</em></span>. The size of the
            tuple will be by definition the <span class="bold"><strong>arity</strong></span>
            of the sample itself.
          </p>
<p>
            A <span class="bold"><strong>dataset