permutation</code> in the data block instead of the transformed data block and read it in as data. This allows an external program to control the blocking, allowing non-random partitions to be evaluated.</p>
</section>
<section id="cross-validation-with-structured-data" class="level3 unnumbered">
<h3 class="unnumbered anchored" data-anchor-id="cross-validation-with-structured-data">Cross-validation with structured data</h3>
<p>Cross-validation must be done with care if the data is inherently structured. For