<p>The codes looks good for me, it is nice to see the codes become easier to read and more consistent. If possible, could you split the pull request into two parts next time?Like "fix default output problem" and "fix some styles" rather than put them altogether.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">&mdash;<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/mlpack/mlpack/pull/680#issuecomment-224589552">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe/AJ4bFFkP0bXOB9AkHaEN0-rLbSCTR6_Zks5qJsRwgaJpZM4Iu0EJ">mute the thread</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/AJ4bFBfNX2ATUMZQorYClW8c4T3ysplWks5qJsRwgaJpZM4Iu0EJ.gif" width="1" /></p>
<div itemscope itemtype="http://schema.org/EmailMessage">
<div itemprop="action" itemscope itemtype="http://schema.org/ViewAction">
  <link itemprop="url" href="https://github.com/mlpack/mlpack/pull/680#issuecomment-224589552"></link>
  <meta itemprop="name" content="View Pull Request"></meta>
</div>
<meta itemprop="description" content="View this Pull Request on GitHub"></meta>
</div>