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

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




    "yao@apache.org" -- "dongjoon@apache.org" [label=" 13 ", penwidth="10", color="#00688bFF"];
    "cloud0fan@gmail.com" -- "dongjoon@apache.org" [label=" 7 ", penwidth="5", color="#00688bA5"];
    "yao@apache.org" -- "haejoon.lee@databricks.com" [label=" 6 ", penwidth="4", color="#00688b93"];
    "dongjoon@apache.org" -- "yangjie01@baidu.com" [label=" 5 ", penwidth="3", color="#00688b82"];
    "cloud0fan@gmail.com" -- "yao@apache.org" [label=" 4 ", penwidth="3", color="#00688b82"];
    "cloud0fan@gmail.com" -- "yangjie01@baidu.com" [label=" 4 ", penwidth="3", color="#00688b82"];
    "yao@apache.org" -- "yangjie01@baidu.com" [label=" 4 ", penwidth="3", color="#00688b82"];
    "dongjoon@apache.org" -- "haejoon.lee@databricks.com" [label=" 4 ", penwidth="3", color="#00688b82"];
    "haejoon.lee@databricks.com" -- "yangjie01@baidu.com" [label=" 4 ", penwidth="3", color="#00688b82"];
    "dongjoon@apache.org" -- "yikunkero@gmail.com" [label=" 4 ", penwidth="3", color="#00688b82"];
    "cloud0fan@gmail.com" -- "haejoon.lee@databricks.com" [label=" 3 ", penwidth="2", color="#00688b70"];
    "yao@apache.org" -- "yikunkero@gmail.com" [label=" 2 ", penwidth="1", color="#00688b5E"];
    "yikunkero@gmail.com" -- "cloud0fan@gmail.com" [label=" 2 ", penwidth="1", color="#00688b5E"];
    "yangjie01@baidu.com" -- "yikunkero@gmail.com" [label=" 1 ", penwidth="1", color="#00688b4C"];
    "haejoon.lee@databricks.com" -- "yikunkero@gmail.com" [label=" 1 ", penwidth="1", color="#00688b4C"];

}