arch.dot

digraph G {
        node [shape=box];

        User1 [shape=oval, label="Lily"];
        User2 [shape=oval, label="Bob"];
        User3 [shape=oval, label="Eva"];

        {rank = same; User1; User2; User3}

        Browser1 [label="Web browser"];
        Browser2 [label="Web browser"];

        {rank = same; Browser1, Browser2, Client}

        Jupyter [label="Jupyter Notebook server +\n SQLFlow magic command"];
        SQLFlow [label="SQLFlow server"];
        ModelZoo [label="Model Zoo server\n"];
        Argo [label="Tekton on Kubernetes\n(each workflow step is a container)"];
        AI [label="AI engine\n(Alibaba PAI, KubeFlow+Kuberntes, etc)"];
        DBMS [label="database system\n(Hive, MySQL, MaxCompute, etc)"];

        User1 -> Browser1;
        User2 -> Browser2;
        Browser1 -> Jupyter [label="SQL/Flow program"];
        Browser2 -> Jupyter;

        Jupyter -> SQLFlow [label="SQL/Flow program"];
        SQLFlow -> Argo [label="Argo workflow"];
        Argo -> DBMS [label="submit SQL statement"];
        Argo -> AI [label="submit AI job"];
        Argo -> DBMS [label="verify data schema"];

        Client [label="sqlflow command-line client"];

        User3 -> Client;
        Client -> SQLFlow [label="SQL/Flow program"];
        Client -> ModelZoo [label="share models or use shared models"];
}