efined-permutations" class="nav-link" data-scroll-target="#user-defined-permutations">User-defined permutations</a></li>
  <li><a href="#cross-validation-with-structured-data" id="toc-cross-validation-with-structured-data" class="nav-link" data-scroll-target="#cross-validation-with-structured-data">Cross-validation with structured data</a></li>
  <li><a href="#cross-validation-with-spatio-temporal-data" id="toc-cross-validation-with-spatio-temporal-data" class="nav-link" data-scroll-target="#cross-validatio