Mdthbs

I am very new to Latex. Can you help me with this diagram? I have been trying hard but still, I cannot make any progress. I will export the image from Inkscape to tikZ. If it works, I’ll publish the answer myself.

mwe (Credits to @Marmot)

    documentclass[tikz,border=3.14mm]{standalone}

usetikzlibrary{positioning,fit,shadows.blur,shapes.geometric,calc}

begin{document}

begin{tikzpicture}[font=sffamily,

 regentonne/.style={cylinder,aspect=0.3,draw,shape border rotate=90}]

 begin{scope}[nodes={align=center,fill=white,blur shadow}]

  node[regentonne] (A) {MovieLens\ Database};

  node[regentonne,right=10em of A] (B) {MovieLens\ Features};

  path (A) -- (B) node[midway,above=9em,regentonne] (C) {User--Item\ Pairs};

  node[anchor=north west,draw,minimum width=8em] at (B.west|-C.north) (D) {Collaborative\

  Filter\ Algorithms\[2em]SVD\ KNN};

  path let p1=($(D.south)-(B.north)$) in node[anchor=north west,draw,minimum width=8em] at 

  ([yshift=-y1]B.south-|D.west) (E) {Error Prediction\ Models\[2em]

  SVD\ KNN};

  node[right=5em of E,draw] (F) {Algorithm\ Selection};

  node[below=5em of F,draw] (G) {Predicted Rating};

  begin{scope}[>=stealth,thick,->]

   draw[rounded corners] (A) -| (C);

   draw[rounded corners] (D.-10) -| (F);

   path (A) edge (B) (B)  edge (B|-E.north) (D.-60) edge (E.north-|D.-60)

   (E) edge (F)  (F) edge (G) (C.east) edge (C.east-|D.west);

  end{scope}

 end{scope}

 path ($(F)+(5.5em,0)$) coordinate (aux);

 node[draw,inner sep=0.5em,dashed,fit=(B) (E) (F) (aux),

 label={[anchor=north east]north east:Meta learner}] (F1) {};

 node[draw,inner sep=0.5em,dashed,fit=(C) (E) (F1),

 label={[anchor=north east]north east:Recommender system}] (F2) {};

end{tikzpicture}

end{document}

You need to fill in some of the texts yourself.

documentclass[tikz,border=3.14mm]{standalone}

usepackage{tikzlings}

usetikzlibrary{positioning,shadows.blur,shapes.geometric,calc,fit}

tikzset{database/.style={cylinder,aspect=2,draw,fill,shape border rotate=90,path picture={

draw[white] let p1=($(path picture bounding box.north east)-(path picture bounding

box.south west)$) in 

foreach XX in {1,2,3}  {([yshift=-XX*y1/4]path picture bounding box.north west) 

arc(180:360:x1/2 and 0.25*x1/2)};

}}}

begin{document}

begin{tikzpicture}[font=sffamily]

 begin{scope}[nodes={draw,align=center},local bounding box=Canada]

  node[database,minimum size=6em,label={[name=DB]below:DB}] (db){};

  node[draw=blue,anchor=north] (MT) at ([xshift=-7em]db.west) {Model\ Training};

  node[draw=green!60!black,above=2em of MT] (PM)  {Prediction\

  Model};

  path (PM.north west) + (-3em,5em) (MT) + (0,-5em) (db.east) + (1em,0);

 end{scope}

 draw (Canada.south west) rectangle (Canada.north east) node[below

 left]{Recommendation Engine};

 path let p1=($(Canada.north)-(Canada.south)$) in 

 node[left=1em of Canada,minimum height=y1,inner ysep=0pt,draw] (Client) {Client};

 koala[shift={([xshift=-5em,yshift=-3em]Client.west)}]

 begin{scope}[thick,-latex,nodes={fill=white,align=center}]

  draw (Client.71) -| (db) node[pos=0.3]

  {user feedback\ (dots)};

  draw[green!60!black]  (db.west) -- ++(-2em,0) |- (PM) 

   node[pos=0.2]{bla};

  draw[green!60!black]  (PM.west) -- ++(-1em,0) |- (Client.-70) 

   node[pos=0.2]{bla};

  draw[dashed,blue!80!black] (DB.south) -- ++ (0,-1.5em) -| (MT)

  node[pos=0.2]{User history};

  draw[dashed,blue!80!black] (MT) -- (PM);

 end{scope}

end{tikzpicture}

end{document}