meta_data.json

{
    "sample_size": {
        "total": 4287008,
        "train": 3388758,
        "valid": 447520,
        "test": 450730
    },
    "vocab_size": {
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        "user_index": 10952,
        "item_id": 24323,
        "cate_id": 514,
        "user_id": 8471
    },
    "label": [
        "is_click"
    ],
    "max_len": {}
}