Avoid storing bound methods as variables to prevent pickling problems

pymc3/distributions/transforms.py

@@ -5,7 +5,6 @@
 from . import distribution
 from ..math import logit, invlogit
 import numpy as np
-from functools import partial
 
 __all__ = ['transform', 'stick_breaking', 'logodds', 'interval',
           'lowerbound', 'upperbound', 'log', 'sum_to_1', 't_stick_breaking']
@@ -70,8 +69,13 @@ def __init__(self, dist, transform, *args, **kwargs):
             b = np.hstack(((np.atleast_1d(self.shape) == 1)[:-1], False))
             # force the last dim not broadcastable
             self.type = tt.TensorType(v.dtype, b)
-
-        self._repr_latex_ = partial(dist._repr_latex_, dist=dist)
+
+    def _repr_latex_(self, name=None, dist=None):
+        if name is None:
+            name = self.name
+        if dist is None:
+            dist = self.dist
+        return dist._repr_latex_(self, name=name, dist=dist)
 
     def logp(self, x):
         return (self.dist.logp(self.transform_used.backward(x)) +

pymc3/model.py

@@ -1,7 +1,6 @@
 import collections
 import threading
 import six
-from functools import partial
 
 import numpy as np
 import scipy.sparse as sps
@@ -823,7 +822,14 @@ def __init__(self, type=None, owner=None, index=None, name=None,
                                 methods=['random'],
                                 wrapper=InstanceMethod)
 
-            self._repr_latex_ = partial(distribution._repr_latex_, name=name, dist=distribution)
+    def _repr_latex_(self, name=None, dist=None):
+        if self.distribution is None:
+            return None
+        if name is None:
+            name = self.name
+        if dist is None:
+            dist = self.distribution
+        return self.distribution._repr_latex_(name=name, dist=dist)
 
     @property
     def init_value(self):
@@ -916,8 +922,15 @@ def __init__(self, type=None, owner=None, index=None, name=None, data=None,
                              inputs=[data], outputs=[self])
 
             self.tag.test_value = theano.compile.view_op(data).tag.test_value
-
-            self._repr_latex_ = partial(distribution._repr_latex_, name=name, dist=distribution)
+
+    def _repr_latex_(self, name=None, dist=None):
+        if self.distribution is None:
+            return None
+        if name is None:
+            name = self.name
+        if dist is None:
+            dist = self.distribution
+        return self.distribution._repr_latex_(name=name, dist=dist)
 
     @property
     def init_value(self):
@@ -1016,6 +1029,7 @@ def __init__(self, type=None, owner=None, index=None, name=None,
 
         if distribution is not None:
             self.model = model
+            self.distribution = distribution
 
             transformed_name = get_transformed_name(name, transform)
 
@@ -1032,7 +1046,14 @@ def __init__(self, type=None, owner=None, index=None, name=None,
                                 methods=['random'],
                                 wrapper=InstanceMethod)
 
-            self._repr_latex_ = partial(distribution._repr_latex_, name=name, dist=distribution)
+    def _repr_latex_(self, name=None, dist=None):
+        if self.distribution is None:
+            return None
+        if name is None:
+            name = self.name
+        if dist is None:
+            dist = self.distribution
+        return self.distribution._repr_latex_(name=name, dist=dist)
 
     @property
     def init_value(self):