Breaking Change: Making key objects picklable

As mentioned in bob.bio.face!64 (merged) the small hacks made in bob.bio.base to handle pickled stuff is giving more headaches than it should.

So, I decided to make some key objects picklable.

bob/learn/em/test/test_picklability.py

+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+# Tiago de Freitas Pereira <tiago.pereira@idiap.ch>
+
+from bob.learn.em import GMMMachine, ISVBase
+import numpy
+import pickle
+
+
+def test_gmm_machine():
+    gmm_machine = GMMMachine(3,3) 
+    gmm_machine.means = numpy.arange(9).reshape(3,3).astype("float")
+    gmm_machine_after_pickle = pickle.loads(pickle.dumps(gmm_machine))
+    
+    assert numpy.allclose(gmm_machine_after_pickle.means, gmm_machine_after_pickle.means, 10e-3)
+    assert numpy.allclose(gmm_machine_after_pickle.variances, gmm_machine_after_pickle.variances, 10e-3)
+    assert numpy.allclose(gmm_machine_after_pickle.weights, gmm_machine_after_pickle.weights, 10e-3)
+
+
+def test_isv():
+    ubm = GMMMachine(3,3) 
+    ubm.means = numpy.arange(9).reshape(3,3).astype("float")
+    isv_base = ISVBase(ubm, 2)
+    isv_base.u = numpy.arange(18).reshape(9,2).astype("float")
+    isv_base.d = numpy.arange(9).astype("float")
+
+    isv_base_after_pickle = pickle.loads(pickle.dumps(isv_base))
+
+    assert numpy.allclose(isv_base.u, isv_base_after_pickle.u, 10e-3)
+    assert numpy.allclose(isv_base.d, isv_base_after_pickle.d, 10e-3)
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