\begin{tikzpicture}
    \node[rectangle,draw] (ia) at (0,0) {IA};
    \node (ent) at (-2,0) {Entrée};
    \node (sor) at (2,0) {Sorties};
    \node (par) at (0,-1) {Paramètres};

    \draw[->] (ent) to (ia);
    \draw[->] (ia) to (sor);
    \draw[->] (par) to (ia);

    \node[align=left] (par) at (4,0) {Prédiction\\Décision\\Contenu};
    \draw [decorate,decoration = {brace}] (3,-0.6) --  (3,0.6);

\end{tikzpicture}