{
  "id": 75875,
  "title": "Exluding rows with -33 target did not help LB",
  "url": "/competitions/elo-merchant-category-recommendation/discussion/75875",
  "author_name": "",
  "post_date": "2018-12-27T08:38:49.927899600Z",
  "votes": null,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Hi, All,\nTrain set has 2207 rows where target is -33.21928. I excluded these rows.\nCV improved drastically( RMSE 1.6!!) but LB got worse.\nHow can this be explained. Is it a matter of overfitting?</p>",
  "messages": [
    {
      "id": "445938",
      "postDate": "12/27/2018 08:38:49",
      "content": "<p>Hi, All,\nTrain set has 2207 rows where target is -33.21928. I excluded these rows.\nCV improved drastically( RMSE 1.6!!) but LB got worse.\nHow can this be explained. Is it a matter of overfitting?</p>",
      "rawMarkdown": "Hi, All,\nTrain set has 2207 rows where target is -33.21928. I excluded these rows.\nCV improved drastically( RMSE 1.6!!) but LB got worse.\nHow can this be explained. Is it a matter of overfitting?",
      "votes": null
    },
    {
      "id": "445953",
      "postDate": "12/27/2018 09:07:44",
      "content": "<p>Outliers are clearly included in the test set, but valid datasets of your CV may not included outliers.\nThat is why the difference between your CV and LB is big !</p>\n\n<p>Read this comment (especially number2).\n- <a href=\"https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425\">https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425</a></p>",
      "rawMarkdown": "Outliers are clearly included in the test set, but valid datasets of your CV may not included outliers.\nThat is why the difference between your CV and LB is big !\n\nRead this comment (especially number2).\n- [https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425](https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425)",
      "votes": null
    },
    {
      "id": "446307",
      "postDate": "12/27/2018 20:58:37",
      "content": "<p>Thanks  Kami</p>",
      "rawMarkdown": "Thanks  Kami",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 445953,
      "author_name": "kami634",
      "author_url": "",
      "post_date": "12/27/2018 09:07:44",
      "content": "<p>Outliers are clearly included in the test set, but valid datasets of your CV may not included outliers.\nThat is why the difference between your CV and LB is big !</p>\n\n<p>Read this comment (especially number2).\n- <a href=\"https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425\">https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425</a></p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 446307,
      "author_name": "antonspartan",
      "author_url": "",
      "post_date": "12/27/2018 20:58:37",
      "content": "<p>Thanks  Kami</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "445938": "Hi, All,\nTrain set has 2207 rows where target is -33.21928. I excluded these rows.\nCV improved drastically( RMSE 1.6!!) but LB got worse.\nHow can this be explained. Is it a matter of overfitting?",
    "445953": "Outliers are clearly included in the test set, but valid datasets of your CV may not included outliers.\nThat is why the difference between your CV and LB is big !\n\nRead this comment (especially number2).\n- [https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425](https://www.kaggle.com/c/elo-merchant-category-recommendation/discussion/73425)",
    "446307": "Thanks  Kami"
  },
  "source": "meta"
}