{
  "id": 59071,
  "title": "particle_id = 0?",
  "url": "/competitions/trackml-particle-identification/discussion/59071",
  "author_name": "",
  "post_date": "2018-06-18T07:03:44.924712600Z",
  "votes": null,
  "comment_count": 4,
  "views": 0,
  "content": "<p>It might be that I have a bug in my data load, and I have not completely finished exhaustively checking that yet.  </p>\n\n<p>In the truth data set I found particle_id = 0, yet the particle data set did not have any particle_id = 0.  Has anyone else witnessed this?  If particle_id = 0 is true, what does it mean?</p>",
  "messages": [
    {
      "id": "344535",
      "postDate": "06/18/2018 07:03:44",
      "content": "<p>It might be that I have a bug in my data load, and I have not completely finished exhaustively checking that yet.  </p>\n\n<p>In the truth data set I found particle_id = 0, yet the particle data set did not have any particle_id = 0.  Has anyone else witnessed this?  If particle_id = 0 is true, what does it mean?</p>",
      "rawMarkdown": "It might be that I have a bug in my data load, and I have not completely finished exhaustively checking that yet.  \n\nIn the truth data set I found particle_id = 0, yet the particle data set did not have any particle_id = 0.  Has anyone else witnessed this?  If particle_id = 0 is true, what does it mean?",
      "votes": null
    },
    {
      "id": "344568",
      "postDate": "06/18/2018 08:37:09",
      "content": "<p>You should read the welcome message and the documents linked from it as this is abundantly discussed.  Particle_id 0 is for particles that are not of interest, i.e. not created by the experiment.</p>",
      "rawMarkdown": "You should read the welcome message and the documents linked from it as this is abundantly discussed.  Particle_id 0 is for particles that are not of interest, i.e. not created by the experiment.",
      "votes": null
    },
    {
      "id": "344592",
      "postDate": "06/18/2018 09:47:05",
      "content": "<p>you might want to use a string to cut on the particle_id and the use a boolean expression e.g.:  <b>particle_id==\"0\"</b></p>",
      "rawMarkdown": "you might want to use a string to cut on the particle_id and the use a boolean expression e.g.:  <b>particle_id==\"0\"</b>",
      "votes": null
    },
    {
      "id": "344992",
      "postDate": "06/19/2018 03:01:10",
      "content": "<p>Thanks, I missed this somehow.</p>",
      "rawMarkdown": "Thanks, I missed this somehow.",
      "votes": null
    },
    {
      "id": "345009",
      "postDate": "06/19/2018 04:06:19",
      "content": "<p>I found this explanation:</p>\n\n<p>\"particle_id: numerical identifier of the generating particle as defined in the particles file. A value of 0 means that the hit did not originate from a reconstructible particle, but e.g. from detector noise.\"</p>\n\n<p>from 'Event truth' here: <a href=\"https://www.kaggle.com/c/trackml-particle-identification/data\">https://www.kaggle.com/c/trackml-particle-identification/data</a> </p>\n\n<p>I think these could be used for training as negative/false examples.</p>",
      "rawMarkdown": "I found this explanation:\n\n\"particle_id: numerical identifier of the generating particle as defined in the particles file. A value of 0 means that the hit did not originate from a reconstructible particle, but e.g. from detector noise.\"\n\nfrom 'Event truth' here: https://www.kaggle.com/c/trackml-particle-identification/data \n\nI think these could be used for training as negative/false examples.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 344568,
      "author_name": "cpmpml",
      "author_url": "",
      "post_date": "06/18/2018 08:37:09",
      "content": "<p>You should read the welcome message and the documents linked from it as this is abundantly discussed.  Particle_id 0 is for particles that are not of interest, i.e. not created by the experiment.</p>",
      "votes": null,
      "replies": [
        {
          "id": 344992,
          "author_name": "chceight",
          "author_url": "",
          "post_date": "06/19/2018 03:01:10",
          "content": "<p>Thanks, I missed this somehow.</p>",
          "votes": null,
          "replies": []
        }
      ]
    },
    {
      "id": 344592,
      "author_name": "artemiosgeromitsos",
      "author_url": "",
      "post_date": "06/18/2018 09:47:05",
      "content": "<p>you might want to use a string to cut on the particle_id and the use a boolean expression e.g.:  <b>particle_id==\"0\"</b></p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 345009,
      "author_name": "chceight",
      "author_url": "",
      "post_date": "06/19/2018 04:06:19",
      "content": "<p>I found this explanation:</p>\n\n<p>\"particle_id: numerical identifier of the generating particle as defined in the particles file. A value of 0 means that the hit did not originate from a reconstructible particle, but e.g. from detector noise.\"</p>\n\n<p>from 'Event truth' here: <a href=\"https://www.kaggle.com/c/trackml-particle-identification/data\">https://www.kaggle.com/c/trackml-particle-identification/data</a> </p>\n\n<p>I think these could be used for training as negative/false examples.</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "344535": "It might be that I have a bug in my data load, and I have not completely finished exhaustively checking that yet.  \n\nIn the truth data set I found particle_id = 0, yet the particle data set did not have any particle_id = 0.  Has anyone else witnessed this?  If particle_id = 0 is true, what does it mean?",
    "344568": "You should read the welcome message and the documents linked from it as this is abundantly discussed.  Particle_id 0 is for particles that are not of interest, i.e. not created by the experiment.",
    "344592": "you might want to use a string to cut on the particle_id and the use a boolean expression e.g.:  <b>particle_id==\"0\"</b>",
    "344992": "Thanks, I missed this somehow.",
    "345009": "I found this explanation:\n\n\"particle_id: numerical identifier of the generating particle as defined in the particles file. A value of 0 means that the hit did not originate from a reconstructible particle, but e.g. from detector noise.\"\n\nfrom 'Event truth' here: https://www.kaggle.com/c/trackml-particle-identification/data \n\nI think these could be used for training as negative/false examples."
  },
  "source": "meta"
}