{
  "id": 189493,
  "title": "Cross-Validation: But how? Threat of information losing?",
  "url": "/competitions/riiid-test-answer-prediction/discussion/189493",
  "author_name": "Ultron",
  "post_date": "2020-10-07T19:00:18.771000",
  "votes": 2,
  "comment_count": 0,
  "views": 0,
  "content": "<p>Considering the timestamp values, won't it cost us in losing information if we take cross-validation split into this data? <br>\n<img src=\"https://www.kaggleusercontent.com/kf/44116196/eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..Bh1WRE7R_FNGn20FO18V6A.AtlLL_ER-G0gE4iUO9xl2yy4OpMcMPExzlUHE4xAc0bvdP0Ba2nnw4Ql2psxxTGL2WZBwjkAtU7ylLsc9ANT9OvboJDLJ6pWJPbWsa0Iyv0vXkIneaA1jMRWAe4kkTMYYGbXUXVa3sRWVoeQJkuOOKiRvqxaRQ4hn1C5OdSSsJeXdp8vrt7EeiCbJtsPel7k-dDMzRBJtJ31wPEdH4APho-pzhgS1hxIL0513hLjNCwblLap-AeyD0t9vDxQP1lR6GY0w7rsnSaxkXxfZgGmtciaxHO2Novaw2diL61TAS-J8DfkuFMsbMDC1N4XI4MuSpLFfoXMI1g03HX8F486TOIE-PXVezMi_WbJzYEM4MWYxOet1y2aNaSLEmd_AY6MUcOE_ww6YGbx0yj_DJueHlnGN3yBlicf8dHR-X5JhPLyPCF_5pZt16MKYF1eGZfp2QpvYal0S7xKpJGu-ifFx2RN-yZoQkmb0afMYuh8AFuo1WIMsxwYu7oNJvZu99maLfGYLPHl2p5HPK6Bsa1jhpFPHgKXhBnMLm0YwMDJxXuD3s-UFtLiXrvlX29btC8i0PBjeqe9vixy_FZpN5OJRBeIg1zp8oP9ip4xC3vKB6FiSACxmwAq0LzjtfCsPOLelG7Kq9KH_ossEGEREynm5sFvis9vHMH_XnOKssUYa_4.fTUzVgiiK18OEG1W4kReqg/__results___files/__results___20_0.png\" alt=\"\"></p>\n<p>In the figure above, I tried plotting timestamp data grouped by <code>user_id</code> and that's what I found. So, how can we make sure all the activities of a particular user must fall into a single fold? The notebook can be found <a href=\"https://www.kaggle.com/mrutyunjaybiswal/understanding-the-answer-correctness-eda\" target=\"_blank\">here</a>.</p>",
  "messages": [
    {
      "id": 1041475,
      "postDate": "2020-10-07T19:00:18.770Z",
      "content": "<p>Considering the timestamp values, won't it cost us in losing information if we take cross-validation split into this data? <br>\n<img src=\"https://www.kaggleusercontent.com/kf/44116196/eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..Bh1WRE7R_FNGn20FO18V6A.AtlLL_ER-G0gE4iUO9xl2yy4OpMcMPExzlUHE4xAc0bvdP0Ba2nnw4Ql2psxxTGL2WZBwjkAtU7ylLsc9ANT9OvboJDLJ6pWJPbWsa0Iyv0vXkIneaA1jMRWAe4kkTMYYGbXUXVa3sRWVoeQJkuOOKiRvqxaRQ4hn1C5OdSSsJeXdp8vrt7EeiCbJtsPel7k-dDMzRBJtJ31wPEdH4APho-pzhgS1hxIL0513hLjNCwblLap-AeyD0t9vDxQP1lR6GY0w7rsnSaxkXxfZgGmtciaxHO2Novaw2diL61TAS-J8DfkuFMsbMDC1N4XI4MuSpLFfoXMI1g03HX8F486TOIE-PXVezMi_WbJzYEM4MWYxOet1y2aNaSLEmd_AY6MUcOE_ww6YGbx0yj_DJueHlnGN3yBlicf8dHR-X5JhPLyPCF_5pZt16MKYF1eGZfp2QpvYal0S7xKpJGu-ifFx2RN-yZoQkmb0afMYuh8AFuo1WIMsxwYu7oNJvZu99maLfGYLPHl2p5HPK6Bsa1jhpFPHgKXhBnMLm0YwMDJxXuD3s-UFtLiXrvlX29btC8i0PBjeqe9vixy_FZpN5OJRBeIg1zp8oP9ip4xC3vKB6FiSACxmwAq0LzjtfCsPOLelG7Kq9KH_ossEGEREynm5sFvis9vHMH_XnOKssUYa_4.fTUzVgiiK18OEG1W4kReqg/__results___files/__results___20_0.png\" alt=\"\"></p>\n<p>In the figure above, I tried plotting timestamp data grouped by <code>user_id</code> and that's what I found. So, how can we make sure all the activities of a particular user must fall into a single fold? The notebook can be found <a href=\"https://www.kaggle.com/mrutyunjaybiswal/understanding-the-answer-correctness-eda\" target=\"_blank\">here</a>.</p>",
      "rawMarkdown": "Considering the timestamp values, won't it cost us in losing information if we take cross-validation split into this data? \n![](https://www.kaggleusercontent.com/kf/44116196/eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..Bh1WRE7R_FNGn20FO18V6A.AtlLL_ER-G0gE4iUO9xl2yy4OpMcMPExzlUHE4xAc0bvdP0Ba2nnw4Ql2psxxTGL2WZBwjkAtU7ylLsc9ANT9OvboJDLJ6pWJPbWsa0Iyv0vXkIneaA1jMRWAe4kkTMYYGbXUXVa3sRWVoeQJkuOOKiRvqxaRQ4hn1C5OdSSsJeXdp8vrt7EeiCbJtsPel7k-dDMzRBJtJ31wPEdH4APho-pzhgS1hxIL0513hLjNCwblLap-AeyD0t9vDxQP1lR6GY0w7rsnSaxkXxfZgGmtciaxHO2Novaw2diL61TAS-J8DfkuFMsbMDC1N4XI4MuSpLFfoXMI1g03HX8F486TOIE-PXVezMi_WbJzYEM4MWYxOet1y2aNaSLEmd_AY6MUcOE_ww6YGbx0yj_DJueHlnGN3yBlicf8dHR-X5JhPLyPCF_5pZt16MKYF1eGZfp2QpvYal0S7xKpJGu-ifFx2RN-yZoQkmb0afMYuh8AFuo1WIMsxwYu7oNJvZu99maLfGYLPHl2p5HPK6Bsa1jhpFPHgKXhBnMLm0YwMDJxXuD3s-UFtLiXrvlX29btC8i0PBjeqe9vixy_FZpN5OJRBeIg1zp8oP9ip4xC3vKB6FiSACxmwAq0LzjtfCsPOLelG7Kq9KH_ossEGEREynm5sFvis9vHMH_XnOKssUYa_4.fTUzVgiiK18OEG1W4kReqg/__results___files/__results___20_0.png)\n\nIn the figure above, I tried plotting timestamp data grouped by `user_id` and that's what I found. So, how can we make sure all the activities of a particular user must fall into a single fold? The notebook can be found [here](https://www.kaggle.com/mrutyunjaybiswal/understanding-the-answer-correctness-eda).",
      "votes": 2
    }
  ],
  "comments": [],
  "raw_markdown_by_id": {
    "1041475": "Considering the timestamp values, won't it cost us in losing information if we take cross-validation split into this data? \n![](https://www.kaggleusercontent.com/kf/44116196/eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0..Bh1WRE7R_FNGn20FO18V6A.AtlLL_ER-G0gE4iUO9xl2yy4OpMcMPExzlUHE4xAc0bvdP0Ba2nnw4Ql2psxxTGL2WZBwjkAtU7ylLsc9ANT9OvboJDLJ6pWJPbWsa0Iyv0vXkIneaA1jMRWAe4kkTMYYGbXUXVa3sRWVoeQJkuOOKiRvqxaRQ4hn1C5OdSSsJeXdp8vrt7EeiCbJtsPel7k-dDMzRBJtJ31wPEdH4APho-pzhgS1hxIL0513hLjNCwblLap-AeyD0t9vDxQP1lR6GY0w7rsnSaxkXxfZgGmtciaxHO2Novaw2diL61TAS-J8DfkuFMsbMDC1N4XI4MuSpLFfoXMI1g03HX8F486TOIE-PXVezMi_WbJzYEM4MWYxOet1y2aNaSLEmd_AY6MUcOE_ww6YGbx0yj_DJueHlnGN3yBlicf8dHR-X5JhPLyPCF_5pZt16MKYF1eGZfp2QpvYal0S7xKpJGu-ifFx2RN-yZoQkmb0afMYuh8AFuo1WIMsxwYu7oNJvZu99maLfGYLPHl2p5HPK6Bsa1jhpFPHgKXhBnMLm0YwMDJxXuD3s-UFtLiXrvlX29btC8i0PBjeqe9vixy_FZpN5OJRBeIg1zp8oP9ip4xC3vKB6FiSACxmwAq0LzjtfCsPOLelG7Kq9KH_ossEGEREynm5sFvis9vHMH_XnOKssUYa_4.fTUzVgiiK18OEG1W4kReqg/__results___files/__results___20_0.png)\n\nIn the figure above, I tried plotting timestamp data grouped by `user_id` and that's what I found. So, how can we make sure all the activities of a particular user must fall into a single fold? The notebook can be found [here](https://www.kaggle.com/mrutyunjaybiswal/understanding-the-answer-correctness-eda)."
  }
}