[WIP] Update requirements file for project dependencies

[Copilot]

• Create models/ directory with __init__.py, gnn_model.py, clip_encoder.py
• Create utils/ directory with __init__.py, data_loader.py, preprocessing.py
• Create experiments/ directory with main_train.ipynb and zhiheng_test.ipynb
• Create requirements.txt
• Create train_script.py

Original prompt

/my_project
├── models/ # 存放各种模型定义 (GNN, CLIP encoder)
├── utils/ # 数据加载、预处理逻辑
├── experiments/ # 这里存放大家的 .ipynb 实验记录（每个人带上自己的名字）
│ ├── main_train.ipynb
│ └── zhiheng_test.ipynb
├── requirements.txt # 需要安装的包
└── train_script.py # 核心训练脚本

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