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    rankdir="TB"
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        fillcolor="deepskyblue2"
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    "Lab1_ai_evaluation" -- "Lab4_simulate_datasets" [label=" 540 ", penwidth="8", color="#DC143CDB"];
    "Lab2_nlp_evaluation" -- "Lab4_simulate_datasets" [label=" 326 ", penwidth="5", color="#DC143CA5"];
    "Lab1_ai_evaluation" -- "Lab3_risk_safety_eval" [label=" 172 ", penwidth="2", color="#DC143C70"];
    "Lab2_nlp_evaluation" -- "Lab3_risk_safety_eval" [label=" 153 ", penwidth="2", color="#DC143C70"];
    "Lab3_risk_safety_eval" -- "Lab4_simulate_datasets" [label=" 137 ", penwidth="2", color="#DC143C70"];

}