{
  "id": 9892,
  "title": "Simplified problems, newbie questions",
  "url": "/competitions/galaxy-zoo-the-galaxy-challenge/discussion/9892",
  "author_name": "",
  "post_date": "2014-07-30T14:18:08.680Z",
  "votes": 2,
  "comment_count": 3,
  "views": 3154,
  "content": "<p>Hi,</p>\n<p>I am new to machine learning and want to get start with this competition. However, I had to simplify it a bit and tried to approach with another way.</p>\n<p>In my project, I only tried to classify 5 classes, which are: Completely Round (7.1); In Between (7.2); Cigar-Shaped (7.3); Disk-View Edge On (2.1) and Spiral Arm(4.1). I choose only picture with high probability of belonging to one of these classes (&gt;70%) and assume that as 100% (which, in my opinion, turns this problem into a complete clasification problem). I divided the training set into 2 parts. Part 1 (75% of original training set) will be used as my new training set. Part 2 will be used as test set and the result will be used in comparision with what I achieve. I intend to use &quot;K-nearest neighbor&quot; or &quot;Naive-Bayes&quot; method, so I have some questions to consider.</p>\n<p>+) Which features should I extract from those images ?</p>\n<p>+) Is there some better method to deal with this kind of problem ?</p>\n<p>If you have any idea about this problem, feel free to post it here also. I would love to know.</p>\n<p>Thanks for reading and I am sorry if this bothers you.</p>",
  "messages": [
    {
      "id": "51358",
      "postDate": "07/30/2014 14:18:08",
      "content": "<p>Hi,</p>\n<p>I am new to machine learning and want to get start with this competition. However, I had to simplify it a bit and tried to approach with another way.</p>\n<p>In my project, I only tried to classify 5 classes, which are: Completely Round (7.1); In Between (7.2); Cigar-Shaped (7.3); Disk-View Edge On (2.1) and Spiral Arm(4.1). I choose only picture with high probability of belonging to one of these classes (&gt;70%) and assume that as 100% (which, in my opinion, turns this problem into a complete clasification problem). I divided the training set into 2 parts. Part 1 (75% of original training set) will be used as my new training set. Part 2 will be used as test set and the result will be used in comparision with what I achieve. I intend to use &quot;K-nearest neighbor&quot; or &quot;Naive-Bayes&quot; method, so I have some questions to consider.</p>\n<p>+) Which features should I extract from those images ?</p>\n<p>+) Is there some better method to deal with this kind of problem ?</p>\n<p>If you have any idea about this problem, feel free to post it here also. I would love to know.</p>\n<p>Thanks for reading and I am sorry if this bothers you.</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "51360",
      "postDate": "07/30/2014 14:23:47",
      "content": "<p>I forgot to mention, I used NI LabVIEW to do the project :D</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "51369",
      "postDate": "07/30/2014 16:20:02",
      "content": "<p>Dear Minh,</p>\n<p>The Galaxy Challenge ended several months ago, so your entry unfortunately will not be considered for the competition. If you are interested in working with the data, you are welcome to still download it, but there is no prize money available at this point.&nbsp;</p>\n<p>- Kyle Willett</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "51377",
      "postDate": "07/30/2014 19:04:01",
      "content": "<p>Dear Kyle,</p>\n<p>I think you misunderstood a bit :D I am new to machine learning and I want to start with this project (which is simplified from Galaxy Zoo). I started this thread only to ask for ideas to solve my mentioned problems.</p>\n<p>Thank you anyway.</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 51360,
      "author_name": "minhdinh0",
      "author_url": "",
      "post_date": "07/30/2014 14:23:47",
      "content": "<p>I forgot to mention, I used NI LabVIEW to do the project :D</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 51369,
      "author_name": "willettk",
      "author_url": "",
      "post_date": "07/30/2014 16:20:02",
      "content": "<p>Dear Minh,</p>\n<p>The Galaxy Challenge ended several months ago, so your entry unfortunately will not be considered for the competition. If you are interested in working with the data, you are welcome to still download it, but there is no prize money available at this point.&nbsp;</p>\n<p>- Kyle Willett</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 51377,
      "author_name": "minhdinh0",
      "author_url": "",
      "post_date": "07/30/2014 19:04:01",
      "content": "<p>Dear Kyle,</p>\n<p>I think you misunderstood a bit :D I am new to machine learning and I want to start with this project (which is simplified from Galaxy Zoo). I started this thread only to ask for ideas to solve my mentioned problems.</p>\n<p>Thank you anyway.</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "51358": "",
    "51360": "",
    "51369": "",
    "51377": ""
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  "source": "meta"
}