Only one Horizontal line below the Caption of Algorithm in latex

Question

I want only one Horizontal line below the caption in latex algorithm but in my case it gives line below and above the caption as shown. How can I get the desired output ?

\documentclass[12pt,a4paper, oneside]{Thesis}
\usepackage[ruled, vlined, linesnumbered]{algorithm2e}
\begin{document}
\begin{algorithm}[H]
  \label{algo:datapacket}
  \caption{Algorithm for selecting the forwarder among PFNs.}
  % do something
\end{algorithm}
\end{document}

Answer 1

The macro that does the rule above the caption is \@algocf@pre@ruled. You can redefine it to do nothing:

\documentclass[12pt,a4paper, oneside]{article}
\usepackage[ruled, vlined, linesnumbered]{algorithm2e}

\makeatletter
\def\@algocf@pre@ruled{}%
\makeatother

\begin{document}

\begin{algorithm}[H]
  \caption{Algorithm for selecting the forwarder among PFNs.}
  \label{algo:datapacket}
  \While{Meaning of Life = 42}{
    Hello world!
  }
\end{algorithm}

\end{document}

Also, the \label has to be after the \caption.