/code></pre>
<p>As the example bernoulli model only contains a single parameter,
and as the default metric is <code>diag_e</code>, the inverse mass matrix is a <span class="math inline">\(1 \times 1\)</span> matrix,
and the length of the diagonal vector is also <span class="math inline">\(1\)</span>.</p>
<p>In contrast, if we run the eight schools example model with metric <code>dense_e</code>, the adaptation
comments section lists both the stepsize and the full <span class="math inline">\(10 \times 10\)</s