{
  "id": 583358,
  "title": "Clarification on Null Values in Thermopile and Time-of-Flight Columns for IMU-Only Sequences",
  "url": "/competitions/cmi-detect-behavior-with-sensor-data/discussion/583358",
  "author_name": "",
  "post_date": "2025-06-06T08:16:26.580642500Z",
  "votes": 2,
  "comment_count": 3,
  "views": 0,
  "content": "<blockquote>\n  <p>Expect approximately 3,500 sequences in the hidden test set.<br>\n  Half of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.</p>\n</blockquote>\n<p>I have two questions. I'd like to ask to be precise.</p>\n<ol>\n<li><p>For the 'IMU only' sequences, when the description says they 'contain null values,' does this mean that only some of the values in the thermopile and time-of-flight columns are null, not necessarily <strong>all of them</strong>?</p></li>\n<li><p>Conversely, for the other half of the sequences (the non-IMU-only ones), does this mean their thermopile and time-of-flight columns are complete and contain no null values at all?</p></li>\n</ol>",
  "messages": [
    {
      "id": "3218474",
      "postDate": "06/06/2025 08:16:26",
      "content": "<blockquote>\n  <p>Expect approximately 3,500 sequences in the hidden test set.<br>\n  Half of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.</p>\n</blockquote>\n<p>I have two questions. I'd like to ask to be precise.</p>\n<ol>\n<li><p>For the 'IMU only' sequences, when the description says they 'contain null values,' does this mean that only some of the values in the thermopile and time-of-flight columns are null, not necessarily <strong>all of them</strong>?</p></li>\n<li><p>Conversely, for the other half of the sequences (the non-IMU-only ones), does this mean their thermopile and time-of-flight columns are complete and contain no null values at all?</p></li>\n</ol>",
      "rawMarkdown": ">Expect approximately 3,500 sequences in the hidden test set.\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.\n\nI have two questions. I'd like to ask to be precise.\n\n1. For the 'IMU only' sequences, when the description says they 'contain null values,' does this mean that only some of the values in the thermopile and time-of-flight columns are null, not necessarily **all of them**?\n\n2. Conversely, for the other half of the sequences (the non-IMU-only ones), does this mean their thermopile and time-of-flight columns are complete and contain no null values at all?",
      "votes": null
    },
    {
      "id": "3218477",
      "postDate": "06/06/2025 08:20:54",
      "content": "<ol>\n<li>For 'IMU' only sequences, all values in the thermopile and time-of-flight columns are null.</li>\n<li>While I'm not entirely certain, most 'non-IMU-only' sequences should be complete. There may be a few null values, but not all entries are affected.</li>\n</ol>",
      "rawMarkdown": "1. For 'IMU' only sequences, all values in the thermopile and time-of-flight columns are null.\n2. While I'm not entirely certain, most 'non-IMU-only' sequences should be complete. There may be a few null values, but not all entries are affected.",
      "votes": null
    },
    {
      "id": "3218484",
      "postDate": "06/06/2025 08:32:14",
      "content": "<p>Thanks!</p>\n<blockquote>\n  <p>all values in the thermopile and time-of-flight columns are null.</p>\n</blockquote>\n<p>Was it mentioned anywhere that all the values are null, or could you check/confirm that?</p>",
      "rawMarkdown": "Thanks!\n\n>all values in the thermopile and time-of-flight columns are null.\n\nWas it mentioned anywhere that all the values are null, or could you check/confirm that?",
      "votes": null
    },
    {
      "id": "3218486",
      "postDate": "06/06/2025 08:35:44",
      "content": "<p>In the dataset description.<br>\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.</p>",
      "rawMarkdown": "In the dataset description.\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 3218477,
      "author_name": "hearttt",
      "author_url": "",
      "post_date": "06/06/2025 08:20:54",
      "content": "<ol>\n<li>For 'IMU' only sequences, all values in the thermopile and time-of-flight columns are null.</li>\n<li>While I'm not entirely certain, most 'non-IMU-only' sequences should be complete. There may be a few null values, but not all entries are affected.</li>\n</ol>",
      "votes": null,
      "replies": [
        {
          "id": 3218484,
          "author_name": "yudaiueno",
          "author_url": "",
          "post_date": "06/06/2025 08:32:14",
          "content": "<p>Thanks!</p>\n<blockquote>\n  <p>all values in the thermopile and time-of-flight columns are null.</p>\n</blockquote>\n<p>Was it mentioned anywhere that all the values are null, or could you check/confirm that?</p>",
          "votes": null,
          "replies": [
            {
              "id": 3218486,
              "author_name": "hearttt",
              "author_url": "",
              "post_date": "06/06/2025 08:35:44",
              "content": "<p>In the dataset description.<br>\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.</p>",
              "votes": null,
              "replies": []
            }
          ]
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "3218474": ">Expect approximately 3,500 sequences in the hidden test set.\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences.\n\nI have two questions. I'd like to ask to be precise.\n\n1. For the 'IMU only' sequences, when the description says they 'contain null values,' does this mean that only some of the values in the thermopile and time-of-flight columns are null, not necessarily **all of them**?\n\n2. Conversely, for the other half of the sequences (the non-IMU-only ones), does this mean their thermopile and time-of-flight columns are complete and contain no null values at all?",
    "3218477": "1. For 'IMU' only sequences, all values in the thermopile and time-of-flight columns are null.\n2. While I'm not entirely certain, most 'non-IMU-only' sequences should be complete. There may be a few null values, but not all entries are affected.",
    "3218484": "Thanks!\n\n>all values in the thermopile and time-of-flight columns are null.\n\nWas it mentioned anywhere that all the values are null, or could you check/confirm that?",
    "3218486": "In the dataset description.\nHalf of the hidden-test sequences are recorded with IMU only; the thermopile (thm_) and time-of-flight (tof__v*) columns are still present but contain null values for those sequences."
  },
  "source": "meta"
}