{
  "id": 8213,
  "title": "vowpal-wabbit produces different results with the same input",
  "url": "/competitions/acquire-valued-shoppers-challenge/discussion/8213",
  "author_name": "",
  "post_date": "2014-05-19T16:23:18.220Z",
  "votes": null,
  "comment_count": 2,
  "views": 1129,
  "content": "<p>Hi, everyone</p>\n<p>I am training my quantile regression model using vowpal-wabbit.</p>\n<p>But I found that if the objects in &nbsp;training set are permuted, vowpal-wabbit will produce totally different model. which makes me very confused...</p>",
  "messages": [
    {
      "id": "44837",
      "postDate": "05/19/2014 16:23:18",
      "content": "<p>Hi, everyone</p>\n<p>I am training my quantile regression model using vowpal-wabbit.</p>\n<p>But I found that if the objects in &nbsp;training set are permuted, vowpal-wabbit will produce totally different model. which makes me very confused...</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "44853",
      "postDate": "05/19/2014 23:28:04",
      "content": "<p>It is because vw is a sort of online learning algorithm, which update the model by looking at the example one by one. The order of the training model indeed affect the convergence of the optimization.</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "44855",
      "postDate": "05/19/2014 23:52:56",
      "content": "<p>Hmm, But it is highly unstable,</p>\n<p>Maybe I should check whether I have too much redundant &nbsp;features</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 44853,
      "author_name": "codingneo",
      "author_url": "",
      "post_date": "05/19/2014 23:28:04",
      "content": "<p>It is because vw is a sort of online learning algorithm, which update the model by looking at the example one by one. The order of the training model indeed affect the convergence of the optimization.</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 44855,
      "author_name": "user191111",
      "author_url": "",
      "post_date": "05/19/2014 23:52:56",
      "content": "<p>Hmm, But it is highly unstable,</p>\n<p>Maybe I should check whether I have too much redundant &nbsp;features</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "44837": "",
    "44853": "",
    "44855": ""
  },
  "source": "meta"
}