documentclass[border=10pt]{standalone}
usepackage{tikz}
usetikzlibrary{shapes.geometric}
usetikzlibrary{arrows.meta}
begin{document}

begin{tikzpicture}
[auto,
decision/.style={diamond, draw=blue, thick, fill=blue!20,
text width=4.5em,align=flush center,
inner sep=1pt},
block/.style ={rectangle, draw=blue, thick, fill=blue!20,
text width=5em,align=center, rounded corners,
minimum height=4em},
line/.style ={draw, thick, -latex’,shorten >=2pt},
cloud/.style ={draw=red, thick, ellipse,fill=red!20,
minimum height=2em}]
matrix [column sep=5mm,row sep=7mm]
{
% row 1
node [cloud] (expert) {expert}; &
node [block] (init) {initialize model}; &
node [cloud] (system) {system}; \
% row 2
& node [block] (identify) {identify candidate model}; & \
% row 3
node [block] (update) {update model}; &
node [block] (evaluate) {evaluate candidate models}; & \
% row 4
& node [decision] (decide) {is best candidate}; & \
% row 5
& node [block] (stop) {stop}; & \
};
begin{scope}[every path/.style=line]
path (init) -- (identify);
path (identify) -- (evaluate);
path (evaluate) -- (decide);
path (update) |- (identify);
path (decide) -| node [near start] {yes} (update);
path (decide) -- node [midway] {no} (stop);
path [dashed] (expert) -- (init);
path [dashed] (system) -- (init);
path [dashed] (system) |- (evaluate);
end{scope}
end{tikzpicture}

end{document}