[Biojava-dev] Training HMMs

Matthew Pocock matthew_pocock at yahoo.co.uk
Tue Aug 12 20:55:03 EDT 2003


Hi,

I've just found and fixed a bug in training HMMs with
dot (delete) states. The forwards/backwards matricies
were being incorrectly calculated for these
non-emission states, causing the training to fail in
odd ways. In many cases, where the dot states are used
in a constant context, this would have caused the
models to be aproximately correct. In other cases
where a dot state is used in very different contexts
in different parts of the sequence, e.g. profile HMMs,
this would have been catastrophic.

Good luck.

Matthew

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