\begin{tikzpicture}[>=latex,line join=bevel,]
  \pgfsetlinewidth{1bp}
%%
\pgfsetcolor{black}
  % Edge: a -> b
  \draw [->] (82.074bp,27.164bp) .. controls (89.035bp,29.153bp) and (96.564bp,31.304bp)  .. (113.82bp,36.233bp);
  % Edge: aa -> b
  \draw [->] (93.314bp,66.212bp) .. controls (96.975bp,65.131bp) and (100.7bp,64.032bp)  .. (114.15bp,60.061bp);
  % Edge: c -> d
  \draw [->] (271bp,56.764bp) .. controls (271bp,54.301bp) and (271bp,51.838bp)  .. (271bp,39.25bp);
  % Edge: b -> c
  \draw [->] (197.54bp,58.267bp) .. controls (204.56bp,59.963bp) and (211.91bp,61.737bp)  .. (228.86bp,65.828bp);
  % Edge: d -> b
  \draw [->] (222.98bp,31.591bp) .. controls (217.84bp,32.832bp) and (212.59bp,34.099bp)  .. (197.54bp,37.733bp);
  % Node: aa
\begin{scope}
  \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
  \pgfsetstrokecolor{strokecol}
  \draw (50bp,79bp) ellipse (50bp and 25bp);
  \draw (50bp,79bp) node {$\begin{array}{c}\text{generate}\\\text{arbitrary initial}\\ \mu_h, u_i\end{array}$};
\end{scope}
  % Node: a
\begin{scope}
  \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
  \pgfsetstrokecolor{strokecol}
  \draw (50bp,18bp) ellipse (37bp and 18bp);
  \draw (50bp,18bp) node {generate $G_i$};
\end{scope}
  % Node: c
\begin{scope}
  \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
  \pgfsetstrokecolor{strokecol}
  \draw (271bp,76bp) ellipse (49bp and 19bp);
  \draw (271bp,76bp) node {$\begin{array}{c}\text{compute}\\ \text{new columns }c_i\end{array}$};
\end{scope}
  % Node: b
\begin{scope}
  \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
  \pgfsetstrokecolor{strokecol}
  \draw (155bp,48bp) ellipse (46bp and 25bp);
  \draw (155bp,48bp) node {$\begin{array}{c}\text{compute}\\ \text{weights }w_a\\ \text{of arcs }a \in A_i\end{array}$};
\end{scope}
  % Node: d
\begin{scope}
  \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
  \pgfsetstrokecolor{strokecol}
  \draw (271bp,20bp) ellipse (60bp and 19bp);
  \draw (271bp,20bp) node {$\begin{array}{c}\text{compute}\\ \text{dual variables }\mu_h, u_i\end{array}$};
\end{scope}
%
\end{tikzpicture}