Add the option pdb to compute_test_value and compute_test_value_opt

theano/configdefaults.py

@@ -379,7 +379,7 @@ AddConfigVar('compute_test_value',
          "Constants, SharedVariables and the tag 'test_value' as inputs "
          "to the function. This helps the user track down problems in the "
          "graph before it gets optimized."),
-        EnumStr('off', 'ignore', 'warn', 'raise'),
+        EnumStr('off', 'ignore', 'warn', 'raise', 'pdb'),
         in_c_key=False)
 
 
@@ -387,7 +387,7 @@ AddConfigVar('compute_test_value_opt',
              ("For debugging Theano optimization only."
               " Same as compute_test_value, but is used"
               " durint Theano optimizatoin"),
-             EnumStr('off', 'ignore', 'warn', 'raise'),
+             EnumStr('off', 'ignore', 'warn', 'raise', 'pdb'),
              in_c_key=False)
 
 """Note to developers:

theano/gof/op.py

@@ -13,6 +13,7 @@ __contact__   = "theano-dev <theano-dev@googlegroups.com>"
 __docformat__ = "restructuredtext en"
 
 import logging
+import sys
 import warnings
 
 import theano
@@ -408,6 +409,9 @@ class PureOp(object):
                     elif config.compute_test_value == 'ignore':
                         # silently skip test
                         run_perform = False
+                    elif config.compute_test_value == 'pdb':
+                        import pdb
+                        pdb.post_mortem(sys.exc_info()[2])
                     else:
                         raise ValueError('%s is invalid for option config.compute_Test_value' % config.compute_test_value)