title: Filtering in mlr3filters - where can I find details about the methods?
body: <p>I try to find details about the filtering methods that are mentioned here:</p>
  <p><a href="https://mlr3book.mlr-org.com/list-filters.html#list-filters" rel="nofollow noreferrer">https://mlr3book.mlr-org.com/list-filters.html#list-filters</a></p>
  <p><a href="https://mlr3filters.mlr-org.com/" rel="nofollow noreferrer">https://mlr3filters.mlr-org.com/</a></p>
  <p>Unfortunately, I could not find more detailed information, e.g. how is <code>information_gain</code> calculated and what parameter can I set.</p>
  <p>Where do I find details about this?</p>