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← Feature Selection Mini-Project Video - Intro to Machine Learning

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Showing Revision 3 created 05/25/2016 by Udacity Robot.

  1. Welcome to the mini project for feature selection.
  2. In one of the earlier videos in this lesson I told you about when I was working
  3. with the e-mail data, that there was a word that was effectively serving as
  4. a signature on the e-mails and I didn't initially realize it.
  5. Now, the mark of a good machine learner doesn't mean that they never make any
  6. mistakes or that their features are always perfect.
  7. It means that they're on the lookout for ways to check this and
  8. to figure out if there is a bug in there that they need to go in and fix.
  9. So in this case it would mean that there's a type of signature word,
  10. that we would need to go in and remove in order for
  11. us to, to feel like we were being fair in our supervised classification.
  12. So this was a really big learning experience for me.
  13. So I want to share it with you in this mini project.
  14. I'm going to sort of take you into my head as I was trying to
  15. figure out what was going on that I couldn't over fit this decision tree.
  16. And how I figured out that there was one feature or
  17. a couple features that were responsible for that.
  18. And then, specifically,
  19. how I figured out what words they were and how I removed them.
  20. So that's what you'll be doing in this mini project.