{
  "id": 478353,
  "title": "Why are the numbers of train EEG data and train spectrogram data different?",
  "url": "/competitions/hms-harmful-brain-activity-classification/discussion/478353",
  "author_name": "",
  "post_date": "2024-02-20T11:50:11.887315400Z",
  "votes": 1,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Why are the number of the train EEG set and the train spectrogram set different? I think spectrograms are generated from EEG data, so shouldn't the number of the two datasets be the same? However, the number of train EEG is 17,300, and spectrograms are 11,138. Is that okay?</p>",
  "messages": [
    {
      "id": "2660159",
      "postDate": "02/20/2024 11:50:11",
      "content": "<p>Why are the number of the train EEG set and the train spectrogram set different? I think spectrograms are generated from EEG data, so shouldn't the number of the two datasets be the same? However, the number of train EEG is 17,300, and spectrograms are 11,138. Is that okay?</p>",
      "rawMarkdown": "Why are the number of the train EEG set and the train spectrogram set different? I think spectrograms are generated from EEG data, so shouldn't the number of the two datasets be the same? However, the number of train EEG is 17,300, and spectrograms are 11,138. Is that okay?",
      "votes": null
    },
    {
      "id": "2660174",
      "postDate": "02/20/2024 12:09:25",
      "content": "<p>Because multiple EEG data may correspond to one spectrogram data.  These relationships are recorded by <code>offset_seconds</code>, <code>eeg_id</code>, and <code>spectrogram_id</code> in <code>train.csv</code>.  For a more detailed explanation, you can refer to <a href=\"https://www.kaggle.com/cdeotte\" target=\"_blank\">@cdeotte</a>'s <a href=\"https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/468010\" target=\"_blank\">analysis</a>.</p>",
      "rawMarkdown": "Because multiple EEG data may correspond to one spectrogram data.  These relationships are recorded by `offset_seconds`, `eeg_id`, and `spectrogram_id` in `train.csv`.  For a more detailed explanation, you can refer to [@cdeotte](https://www.kaggle.com/cdeotte)'s [analysis](https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/468010).",
      "votes": null
    },
    {
      "id": "2660179",
      "postDate": "02/20/2024 12:19:10",
      "content": "<p>Oh, this reference is good for me. Thanks Koolo!</p>",
      "rawMarkdown": "Oh, this reference is good for me. Thanks Koolo!",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 2660174,
      "author_name": "zijiangyang1116",
      "author_url": "",
      "post_date": "02/20/2024 12:09:25",
      "content": "<p>Because multiple EEG data may correspond to one spectrogram data.  These relationships are recorded by <code>offset_seconds</code>, <code>eeg_id</code>, and <code>spectrogram_id</code> in <code>train.csv</code>.  For a more detailed explanation, you can refer to <a href=\"https://www.kaggle.com/cdeotte\" target=\"_blank\">@cdeotte</a>'s <a href=\"https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/468010\" target=\"_blank\">analysis</a>.</p>",
      "votes": null,
      "replies": [
        {
          "id": 2660179,
          "author_name": "gobyeonggeon",
          "author_url": "",
          "post_date": "02/20/2024 12:19:10",
          "content": "<p>Oh, this reference is good for me. Thanks Koolo!</p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "2660159": "Why are the number of the train EEG set and the train spectrogram set different? I think spectrograms are generated from EEG data, so shouldn't the number of the two datasets be the same? However, the number of train EEG is 17,300, and spectrograms are 11,138. Is that okay?",
    "2660174": "Because multiple EEG data may correspond to one spectrogram data.  These relationships are recorded by `offset_seconds`, `eeg_id`, and `spectrogram_id` in `train.csv`.  For a more detailed explanation, you can refer to [@cdeotte](https://www.kaggle.com/cdeotte)'s [analysis](https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/468010).",
    "2660179": "Oh, this reference is good for me. Thanks Koolo!"
  },
  "source": "meta"
}