N-BEST SEARCH
N-best Decoding
- Similar to Viterbi
- Generate list of best possible hypotheses
- Re-evaluate list with knowledge sources
Issues
- Advantage --- Allows diverse knowledge sources to
choose the most optimal hypothesis
- Problem --- Favors shorter hypotheses
- Sub-optimal modifications alleviate problem
Lattice N-best Search
- First pass --- Create lattice of possible
hypotheses
- Second pass --- Generate N-best hypotheses