GMTK reports an error of zero-variance as mentioned in Issue #103. For instance this can happen if one of the observation tracks is accidentally completely set to zero for all values.
It might be worth considering checking for this error earlier on, printing out a warning, or simply having a variance floor based on some other transformation such as a z-score (see PR #69).
Original report (BitBucket issue) by Eric Roberts (Bitbucket: ericr86, GitHub: ericr86).
GMTK reports an error of zero-variance as mentioned in Issue #103. For instance this can happen if one of the observation tracks is accidentally completely set to zero for all values.
It might be worth considering checking for this error earlier on, printing out a warning, or simply having a variance floor based on some other transformation such as a z-score (see PR #69).