MIT6_047f08_rec03

MIT6_047f08_rec03 - MIT OpenCourseWare http/ocw.mit.edu...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 6.047 / 6.878 Computational Biology: Genomes, Networks, Evolution Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . 6.047/6.878 Fall 2008 Recitation 3 Notes Pouya Kheradpour September 19, 2008 1 Practical issues of machine learning There are many practical issues to deal with when performing machine learning. This is especially true in computational biology because the data sets are so complex that you have to be very careful that your results are meaningful. 1.1 Overfitting 1. In lecture we saw the example of having many clusters leading to a higher probability of the data. 2. This is an extremely, generally unavoidable problem with machine learning – more parameters leads to better training performance. 3. Using more parameters/features generally leads to more overfitting. (a) Always consider how much data you have and if it is enough to learn all the parameters your model has. If you have more features, it may be more likely that the classifier finds something that separates the data just by chance....
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This note was uploaded on 09/24/2010 for the course EECS 6.047 / 6. taught by Professor Manoliskellis during the Fall '08 term at MIT.

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MIT6_047f08_rec03 - MIT OpenCourseWare http/ocw.mit.edu...

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