{
    "sample_size": {
        "total": 757207146,
        "train": 586117494,
        "valid": 17846140,
        "test": 153243512,
        "phase1_total_interactions": 976291071
    },
    "split_by_minimal_tail_with_positive_constraints": {
        "timezone": "Asia/Shanghai",
        "timestamp_unit": "s",
        "train_days": 226,
        "train_range": "2024-10-15 ~ 2025-05-28",
        "valid_days": 1,
        "valid_range": "2025-05-29 ~ 2025-05-29",
        "test_days": 68,
        "test_range": "2025-05-30 ~ 2025-08-05",
        "valid_click_pos": 841303,
        "valid_conversion_pos": 396010,
        "test_click_pos": 553866,
        "test_conversion_pos": 250843,
        "rule": "test=最后最短合法正样本时间段; valid=紧邻test的最短合法正样本时间段; 其余=train"
    },
    "user_filtering": {
        "min_user_interactions": 10,
        "dropped_all_negative_users": 2424604,
        "rule": "用户完整行为序列若既无 click 也无 conversion，则过滤"
    },
    "oov_filter": {
        "min_feat_count": 2,
        "applied_to": {
            "scalar_features": [
                "103",
                "104",
                "105",
                "109",
                "100",
                "101",
                "102",
                "112",
                "114",
                "115",
                "116",
                "117",
                "118",
                "119",
                "120",
                "121",
                "122"
            ],
            "list_features": [
                "106",
                "107",
                "108",
                "110"
            ]
        },
        "rule": "特征值出现次数 < min_feat_count 的统一映射为 0 (unknown/padding)",
        "freq_source": "基于日志中 user/item 出现次数 * 特征值计算"
    },
    "blocked_layout": {
        "train_blocks": 16,
        "valid_blocks": 8,
        "test_blocks": 8,
        "train": {
            "data_dir": "train/data",
            "user_info_dir": "train/user_info",
            "item_info_dir": "train/item_info"
        },
        "valid": {
            "data_dir": "valid/data",
            "user_info_dir": "valid/user_info",
            "item_info_dir": "valid/item_info"
        },
        "test": {
            "data_dir": "test/data",
            "user_info_dir": "test/user_info",
            "item_info_dir": "test/item_info"
        },
        "block_pair_rule": "同一 split 下，data/user_info/item_info 使用相同的 part-xxxxx 编号配对读取。",
        "local_index_rule": {
            "user_index": "block-local dense index, starts from 0",
            "item_index": "block-local dense index, 0 reserved for padding",
            "user_id": "global feature id, consistent across blocks",
            "item_id": "global feature id, consistent across blocks"
        }
    },
    "vocab_size": {
        "user_id": 7706779,
        "item_id": 17487677,
        "timestamp": 0,
        "action": 4,
        "103": 88,
        "104": 3,
        "105": 8,
        "109": 4,
        "106": 15,
        "107": 20,
        "108": 5,
        "110": 3,
        "100": 7,
        "101": 54,
        "102": 173463,
        "112": 31,
        "114": 34,
        "115": 989,
        "116": 21,
        "117": 559,
        "118": 1637,
        "119": 4951,
        "120": 4046,
        "121": 5041300,
        "122": 2389,
        "day_of_week": 8,
        "is_weekend": 3,
        "hour": 25
    },
    "label": [
        "is_click",
        "is_conversion"
    ],
    "action_vocab": {
        "click": 1,
        "conversion": 2,
        "exposure": 3
    },
    "action_vocab_desc": "编码后的 action 词表，用于 dataloader 基于 full_action_seq 构造 task-specific token masks。",
    "action_mapping": {
        "raw_action_type_to_name": {
            "0": "exposure",
            "1": "click",
            "2": "conversion"
        },
        "action_name_to_code": {
            "click": 1,
            "conversion": 2,
            "exposure": 3
        }
    },
    "user_info_schema": {
        "fields": [
            "user_index",
            "full_item_seq",
            "full_action_seq",
            "full_timestamp_seq"
        ],
        "desc": "这里的 user_index / full_item_seq 中的 item index 都是 block-local index；full_action_seq / full_timestamp_seq 为全局时间顺序序列。"
    },
    "item_info_schema": {
        "fields": [
            "item_index",
            "item_id",
            "100",
            "101",
            "102",
            "112",
            "114",
            "115",
            "116",
            "117",
            "118",
            "119",
            "120",
            "121",
            "122"
        ],
        "desc": "item_index 为 block-local index；item_id 为全局 item feature id，用于 embedding 一致性。"
    },
    "feature_schema": {
        "user_scalar_features": [
            "103",
            "104",
            "105",
            "109"
        ],
        "user_list_features": [
            "106",
            "107",
            "108",
            "110"
        ],
        "user_list_keep": 5,
        "user_list_storage": "single-column list[int] with fixed length",
        "user_scalar_encoding": "keep raw integer ids; vocab_size=max+1; OOV filtered",
        "user_list_encoding": "keep raw list[int]; vocab_size=max_sub_feature_id+1; OOV filtered",
        "item_static_features": [
            "100",
            "101",
            "102",
            "112",
            "114",
            "115",
            "116",
            "117",
            "118",
            "119",
            "120",
            "121",
            "122"
        ],
        "item_static_encoding": "keep raw integer ids; vocab_size=max+1; OOV filtered",
        "context_features": [
            "day_of_week",
            "is_weekend",
            "hour"
        ],
        "time_feature_encoding": {
            "day_of_week": "0~6 -> 1~7, 0 reserved for padding/unknown",
            "is_weekend": "0/1 -> 1~2, 0 reserved for padding/unknown",
            "hour": "0~23 -> 1~24, 0 reserved for padding/unknown"
        },
        "timestamp_kept_raw": true,
        "context_time_timezone": "Asia/Shanghai"
    },
    "max_len": {
        "full_item_seq": 100,
        "full_action_seq": 100,
        "full_timestamp_seq": 100
    },
    "raw_action_type_counter": {
        "0": 923826708,
        "1": 27813405,
        "2": 24650958
    }
}