Dr. Mark Humphrys

School of Computing. Dublin City University.

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Missing
DCU student

CASE3 student Paul Bunbury is missing since Thur 2 Feb 2012.
See appeals on crime.ie and garda.ie and facebook.

He is a great coder. See DCU page and boards.ie page.
He won major coding contests in 2010 and 2011.
He is author of the brilliant "FloodItWorld".
DCU can confirm that in Jan 2012 he passed all 6 modules comfortably.


The Back-propagation algorithm

The back-prop algorithm for supervised learning from exemplars is:


Repeat:
  1. Send in inputs Ii for this exemplar.
  2. Calculate outputs yk
  3. Get given correct outputs Ok
  4. Measure E.

  5. wjk weights:
    1. Calculate all the   =   yk ( 1 - yk ) ( yk - Ok )
    2. Calculate all the   =     yj
    3. For all j,k:

  6. wij weights:
    1. Calculate all the   =   yj ( 1 - yj )   Σ k ( wjk )
    2. Calculate all the   =   Ii
    3. For all i,j:

  7. Repeat (next exemplar).


See sample code.



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