{
  "id": 21881,
  "title": "What does Add data that periodical hit the boundary mean",
  "url": "/competitions/facebook-v-predicting-check-ins/discussion/21881",
  "author_name": "",
  "post_date": "2016-06-25T06:39:59.880Z",
  "votes": null,
  "comment_count": 2,
  "views": 413,
  "content": "<p>Hi everyone\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !</p>",
  "messages": [
    {
      "id": "125057",
      "postDate": "06/25/2016 06:39:59",
      "content": "<p>Hi everyone\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !</p>",
      "rawMarkdown": "Hi everyone\r\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !",
      "votes": null
    },
    {
      "id": "125077",
      "postDate": "06/25/2016 14:12:05",
      "content": "<p>[quote=kuan chen;125057]</p>\n\n<p>Hi everyone\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !</p>\n\n<p>[/quote]\nThinking about the features are in a torus, you need to do either customized distance or do periodical extension of the data, knn or methods using only local measure will benefit from this.</p>",
      "rawMarkdown": "[quote=kuan chen;125057]\r\n\r\nHi everyone\r\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !\r\n\r\n[/quote]\r\nThinking about the features are in a torus, you need to do either customized distance or do periodical extension of the data, knn or methods using only local measure will benefit from this.",
      "votes": null
    },
    {
      "id": "125085",
      "postDate": "06/25/2016 14:59:42",
      "content": "<p>@w_________g</p>\n\n<p>Thank you. I got the it!!!</p>",
      "rawMarkdown": "w_________g\r\n\r\nThank you. I got the it!!!",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 125077,
      "author_name": "weizhezhang",
      "author_url": "",
      "post_date": "06/25/2016 14:12:05",
      "content": "<p>[quote=kuan chen;125057]</p>\n\n<p>Hi everyone\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !</p>\n\n<p>[/quote]\nThinking about the features are in a torus, you need to do either customized distance or do periodical extension of the data, knn or methods using only local measure will benefit from this.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 125085,
      "author_name": "kuanchen",
      "author_url": "",
      "post_date": "06/25/2016 14:59:42",
      "content": "<p>@w_________g</p>\n\n<p>Thank you. I got the it!!!</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "125057": "Hi everyone\r\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !",
    "125077": "[quote=kuan chen;125057]\r\n\r\nHi everyone\r\nI saw some script have this preprocessing by adding data that periodically hit the boundary, After working several weeks in this competition, I cannot quite understand this procedure.  Thank in advance !\r\n\r\n[/quote]\r\nThinking about the features are in a torus, you need to do either customized distance or do periodical extension of the data, knn or methods using only local measure will benefit from this.",
    "125085": "w_________g\r\n\r\nThank you. I got the it!!!"
  },
  "source": "meta"
}