<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r68699218">src/mlpack/tests/imputation_test.cpp</a>:</p>
<pre style='color:#555'>> +BOOST_AUTO_TEST_CASE(MeanImputationTest)
> +{
> + arma::mat input("3.0 0.0 2.0 0.0;"
> + "5.0 6.0 0.0 6.0;"
> + "9.0 8.0 4.0 8.0;");
> + arma::mat outputT; // assume input is transposed
> + arma::mat output; // assume input is not transposed
> + double mappedValue = 0.0;
> +
> + MeanImputation<double> imputer;
> +
> + // transposed
> + imputer.Apply(input, outputT, mappedValue, 0/*dimension*/, true);
> +
> + BOOST_REQUIRE_CLOSE(outputT(0, 0), 3.0, 1e-5);
> + BOOST_REQUIRE_CLOSE(outputT(0, 1), 2.5, 1e-5);
</pre>
<p>the current implementation applies only to the given dimension (0 in this case)<br>
so, 0 is ignored and mean is going to be (3 + 2) / 2 = 2.5<br>
and it replaces 0 with 2.5.</p>
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