tree a1bd66e3fb01b30176e29518c3492dfa17ae9506
parent 8c51bcb63b93f148d9fb4b9ee671a34f202c174c
author James Kaufman <jhkauf@us.ibm.com> 1600194358 -0700
committer James Kaufman <jhkauf@us.ibm.com> 1600194358 -0700

fixed edge case bug when denominator is zero. Still need unnormalize
error to walk downhill.