graph G {
    compound="true"
    rankdir="TB"
    bgcolor="white"
    fontname="Tahoma"

    node [
        fixedsize="false"
        fontname="Tahoma"
        color="white"
        fillcolor="deepskyblue2"
        fontcolor="black"
        shape="box"
        style="filled"
        penwidth="1.0"
    ]
    edge [
        fontname="Arial"
        color="#00688b"
        fontcolor="black"
        fontsize="12"
        arrowsize="0.5"
        penwidth="1.0"
    ]

    "[apache / singa-doc]" [fillcolor="deepskyblue2"];
    "[apache / singa-site]" [fillcolor="deepskyblue2"];



    "[apache / singa-site]" -- "[apache / singa-doc]" [label=" 2 ", penwidth="2", color="#00688b70"];
    "[apache / singa-doc]" -- "[apache / singa]" [label=" 2 ", penwidth="2", color="#00688b70"];
    "[apache / singa-site]" -- "[apache / singa]" [label=" 2 ", penwidth="2", color="#00688b70"];

}