{
    "type": "recommendation",
    "user_id": "7ca9bc09d8799c603098ca36a9f66aa2",
    "candidate_category": "book",
    "candidate_list": [
        "1299199",
        "2576156",
        "30231807",
        "6464557",
        "12510888",
        "31748276",
        "26031171",
        "17796022",
        "18739563",
        "6347863",
        "34908732",
        "25905643",
        "13222303",
        "138643",
        "30838250",
        "2658978",
        "6541691",
        "23209952",
        "877910",
        "25813907"
    ],
    "loc": [
        -1,
        -1
    ],
    "data type": "real"
}