[mlpack-svn] [MLPACK] #358: hmm_convert fails for GMM HMM

[MLPACK Trac]

#358: hmm_convert fails for GMM HMM
--------------------------+-------------------------------------------------
 Reporter:  michaelfox99  |        Owner:  michaelfox99
     Type:  defect        |       Status:  new         
 Priority:  major         |    Milestone:  mlpack 1.1.0
Component:  mlpack        |     Keywords:              
 Blocking:                |   Blocked By:              
--------------------------+-------------------------------------------------
 HMMs are now stored in XML files as hierarchical models. This allows
 saving / loading of HMMs with arbitrary emission distributions as long as
 the distributions themselves implement Save() and Load() methods.

 The new XML files for the HMMs are not backwards compatible. Towards this
 end I added hmm_convert, an executable converter. While this works
 correctly for DiscreteDistribution and GaussianDistribution types, it is
 failing for GMM at runtime.

 {{{
 michael at michael-GA-78LMT-USB3:~/Documents$ hmm_convert -m old_model_1.xml
 -o model1.xml
 [DEBUG] Compiled with debugging symbols.
 *** Error in `hmm_convert': free(): invalid pointer: 0x00007feef54d7dc8
 ***
 Aborted (core dumped)
 }}}

 old_model_1.xml is a GMM HMM using the old flat format. This is despite
 GMM::Save() and GMM::Load() working just fine and hmm_convert being
 generic with respect to those calls. There are no explicit calls to free,
 so I suspect its happening in libxml2.

-- 
Ticket URL: <http://trac.research.cc.gatech.edu/fastlab/ticket/358>
MLPACK <www.fast-lab.org>
MLPACK is an intuitive, fast, and scalable C++ machine learning library developed at Georgia Tech.