added few figures (#1088)

tikz/deep_GP_tikz.tex

@@ -0,0 +1,38 @@
+\documentclass[tikz, border=2pt]{standalone}
+\usepackage[utf8]{inputenc}
+\usepackage{tikz}
+\usetikzlibrary{positioning}
+
+% \title{deep_GP_tikz}
+% \author{Vishal Ghoniya}
+% \date{July 2022}
+
+\begin{document}
+% \maketitle
+\tikzstyle {hidden}=[circle,dashed, draw=black, minimum size=1cm]
+\tikzstyle {latent}=[circle, draw=black, minimum size=1cm]
+\tikzstyle {obs}=[circle, draw=black, fill=black!20, minimum size=1cm]
+\begin{tikzpicture}[-,>= stealth, node distance=3mm, thick]
+\node [obs] at (0,0) (rootobs) {$\textbf X$};
+    \node [obs, below=3cm of rootobs] (obs_0) {$\textbf x^*$};
+\node[latent, right=1cm of rootobs] (hid_1) {$\textbf F_1$} edge[<-] (rootobs);
+    \node[latent, below=3cm of hid_1] (hid_0) {$\textbf f_1^{*}$} 
+    edge[<-] (obs_0)
+    edge[<-] (hid_1);
+\node [hidden, right=1cm of hid_1] (hidden_1) {$\textbf K_2$} edge[<-] (hid_1);
+    \node[hidden, below=1cm of hidden_1] (hidden_10) {$\textbf k_2^*$} 
+    edge[<-] (hid_1)
+    edge[<-] (hid_0);
+    \node[hidden, below=1cm of hidden_10] (hidden_0) {$k_2^{**}$} edge[<-] (hid_0);
+
+\node [latent, right=1cm of hidden_1] (hid_11) {$\textbf f_2$} edge[<-] (hidden_1);
+\node [latent, below=3cm of hid_11] {$f_2^*$}
+    edge[<-] (hid_11)
+    edge[<-] (hidden_0)
+    edge[<-] (hidden_1)
+    edge[<-] (hidden_10);
+\node [obs, right=1cm of hid_11] {$\textbf y$} edge[<-] (hid_11);
+
+\end{tikzpicture}
+
+\end{document}

tikz/empirical_cdf_tikz.tex

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+\documentclass[tikz,border=2pt]{standalone}
+\usepackage[utf8]{inputenc}
+\usepackage{tikz}
+\usepackage{pgfplots}
+\usetikzlibrary{positioning}
+
+% \title{empirical_cdf_tikz}
+% \author{Vishal Ghoniya}
+% \date{July 2022}
+
+\pgfplotsset{compat=1.18}
+\begin{document}
+
+% \maketitle
+\begin{tikzpicture}[font={\small}]
+\begin{axis}[axis line style={opacity=0}, 
+    axis lines=left, ytick={0.0,0.2,...,1.0},
+    ymax=1.1, ymin=-0.1, 
+    xtick={0,1,...,4}, 
+    xmax=4.1, 
+    axis background/.style={fill=gray!10}, 
+    extra y ticks={0.1,0.5,0.7},
+    extra y tick labels={{$U^{(1)}$},{$U^{(2)}$},{$U^{(3)}$}}]
+\addplot+[const plot, no marks, thick, black] coordinates {(0,0) (1,0.3) (2,0.3) (2,0.8) (3,0.8) (3,0.8) (3,1) (4,1)};
+\addplot+[const plot, no marks, dashed, thick, black] coordinates {(0,0.1) (1,0.1)};
+\addplot+[const plot, no marks, dashed, thick, black] coordinates {(0,0.7) (2,0.7)};
+\addplot+[const plot, no marks, dashed, thick, black] coordinates {(0,0.5) (2,0.5)};
+\end{axis}
+
+\end{tikzpicture}
+\end{document}