le</span><span class="o">=</span><span class="p">(</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">0.05</span><span class="o">*</span><span class="mi">255</span><span class="p">),</span> <span class="n">per_channel</span><span class="o">=</span><span class="mf">0.5</span><span class="p">),</span>
    <span class="c1"># Make some images brighter and some darker.</span>
    <span class="c1"># In 20% of all cases, we sample the multiplier once per channel,</span>
    <span class="c1"