Numerical noise in chmm.pyx

[jdemeyer]

On cicero:

sage -t -long  -force_lib devel/sage/sage/stats/hmm/chmm.pyx
**********************************************************************
File "/home/buildbot/build/sage/cicero-1/cicero_binary/build/sage-4.8.rc0/devel/sage-main/sage/stats/hmm/chmm.pyx", line 872:
    sage: m.baum_welch(v)
Expected:
    (-162.85437039799817, 49)
Got:
    (-162.8543703979982, 49)
**********************************************************************

I don't know what caused this, but the fix is so easy that I don't want to bother tracking it down.

Component: doctest coverage

Keywords: hidden markov model

Author: Jeroen Demeyer

Reviewer: Marshall Hampton

Merged: sage-4.8.rc0

Issue created by migration from https://trac.sagemath.org/ticket/12283

[jdemeyer]

comment:1

Attachment: 12283_chmm_noise.patch.gz

[sagetrac-mhampton]

comment:2

OK, I checked that this patch works for me; I did not check it on cicero but I think its clear that it fixes this particular problem.

[sagetrac-mhampton]

Reviewer: Marshall Hampton

[jdemeyer]

Merged: sage-4.8.rc0