#15711: DiscreteHiddenMarkovModel instances do not unpickle correctly
--------------------------+----------------------------
Reporter: ppurka | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: statistics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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From the [https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA
google notebook bug reports]
''As you can see in the following script, even though an unpickled
instance claims to be equal to the original, it behaves differently.
Worse, several of the functions (e.g., M2.transition_matrix()) throw
exceptions, and an exception is thrown if you just try to print the
object's value. ''
{{{
sage: from sage.stats.hmm.hmm import DIscreteHiddenMarkovModel
sage: M = DiscreteHiddenMarkovModel([[1.0]], [[0.1, 0.9]], [1.0])
sage: import pickle
sage: M2 = pickle.loads(pickle.dumps(M))
sage: M2 == M
True
sage: M.log_likelihood([1]*4)
-0.4214420626313051
sage: M2.log_likelihood([1]*4)
-inf
sage: M2.emission_matrix()
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-24-2ee08778d25e> in <module>()
----> 1 M2.emission_matrix()
/opt/sage-5.12-linux-64bit-fedora_release_16_verne-
x86_64-Linux/local/lib/python2.7/site-packages/sage/stats/hmm/hmm.so in
sage.stats.hmm.hmm.DiscreteHiddenMarkovModel.emission_matrix
(sage/stats/hmm/hmm.c:2760)()
/opt/sage-5.12-linux-64bit-fedora_release_16_verne-
x86_64-Linux/local/lib/python2.7/site-packages/sage/matrix/constructor.pyc
in _matrix_constructor(*args, **kwds)
641 raise ValueError, "entries has the wrong length"
642 elif len(args[0]) > 0:
--> 643 raise ValueError, "entries has the wrong length"
644
645 entries = args[0]
ValueError: entries has the wrong length
sage: M2
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-20-13669956a766> in <module>()
... (long trace deleted)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15711>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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