\newcommand{\width}{0.2}
\newcommand{\height}{0.4}
\newcommand{\disty}{0.2}
\definecolor{colorbblue}{HTML}{0072B2}
\definecolor{colorbgreen}{HTML}{009E73}
\definecolor{colorborange}{HTML}{D55E00}


\tikzstyle{act}=[draw=black, fill=black!10]
\def \coldist {2.3}
\def \widthb {1.9}

\begin{tikzpicture}[scale=2]
    \draw[->, -Latex, line width=5pt]
        (1.0+0*\coldist, 0.2) --(1.0+0*\coldist, -0*\disty-1*\height-0.3) --(2.1+0*\coldist, -0*\disty-1*\height-0.3) --(2.2+0*\coldist, 0.2)
     -- (1.0+1*\coldist, 0.2) --(1.0+1*\coldist, -0*\disty-1*\height-0.3) --(2.1+1*\coldist, -0*\disty-1*\height-0.3) --(2.2+1*\coldist, 0.2)
     -- (1.0+2*\coldist, 0.2) --(1.0+2*\coldist, -0*\disty-1*\height-0.6);% --(2.1+4*\coldist, -4.3) --(2.2+4*\coldist, 0.5)
     % -- (1.0+5*\coldist, 0.5) --(1.0+5*\coldist, -4.5);

    \draw[act]       (0*\coldist,-0*\height-0*\disty) rectangle (0*\coldist+\widthb,-0*\disty-1*\height) node[pos=.5] {Preprocessing};
    \draw[act]       (1*\coldist,-0*\height-0*\disty) rectangle (1*\coldist+\widthb,-0*\disty-1*\height) node[pos=.5] {Feature Extraction};
    \draw[act]       (2*\coldist,-0*\height-0*\disty) rectangle (2*\coldist+\widthb,-0*\disty-1*\height) node[pos=.5] {Classification};

    \draw[draw=none, align=center] (0.5 + 0*\coldist,+0.5*\disty-0*\height) rectangle (0.5 + 0*\coldist,+0.5*\disty-0*\height) node[pos=.5] {Raw Text};
    \draw[draw=none, align=center] (1.0 + 0*\coldist,-0*\disty-2*\height) rectangle (1.0 + 0*\coldist,-2*\disty-2*\height) node[pos=.5] {Cleaned\\Text};
    \draw[draw=none, align=center] (1.0 + 1*\coldist,-0*\disty-2*\height) rectangle (1.0 + 1*\coldist,-2*\disty-2*\height) node[pos=.5] {Fixed-length\\float array};
    \draw[draw=none, align=center] (1.0 + 2*\coldist,-0*\disty-2*\height) rectangle (1.0 + 2*\coldist,-3*\disty-2*\height) node[pos=.5] {Language probabilities};
\end{tikzpicture}