> <span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">],</span>  <span class="c1"># Protect 1st and 3rd features</span>
<span class="gp">... </span>    <span class="s1">&#39;alpha&#39;</span><span class="p">:</span> <span class="mf">0.95</span>
<span class="gp">... </span><span class="p">})</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">model</span><span class="o">.</span><span class="n">update</span><span class="p">({</span><span c