Wake Word Detection with Alignment-Free Lattice-Free MMI
Table 5: Effect of using alignments from Alignment-free LF-MMI for regular LF-MMI.
['FRR(%)', 'SNIPS (FAH=0.04)', 'Mobvoi (FAH=1.5)']
The experiment from the previous section motivates us to do an additional experiment investigating how the regular LF-MMI performs when it gets alignments from the alignment-free LF-MMI system instead of from a GMM model, and whether the regular LF-MMI training could further improve the performance as a refinement of our existing system. Note that as we already achieve FRR=0 at FAH=0.5 with SNIPS using our alignment-free LF-MMI system, we set the operating point at a smaller FAH (0.04) for it.