fixed defensive programming to not raise when compute_test_value =

theano/gof/op.py

@@ -563,3 +563,23 @@ def get_test_value(v):
             return v
         raise
 
+def missing_test_message(msg):
+    """ Displays msg, a message saying that some test_value is missing,
+    in the appropriate form based on config.compute_test_value:
+
+        off: the interactive debugger is off, so we do nothing
+        ignore: the interactive debugger is set to ignore missing inputs,
+                so do nothing
+        warn: display msg as a warning
+        raise: raise an AttributeError with msg as the exception text
+    """
+
+
+    action = config.compute_test_value
+
+    if action == 'raise':
+        raise AttributeError(msg)
+    elif action == 'warn':
+        warnings.warn(msg, stacklevel = 2)
+    else:
+        assert action in [ 'ignore', 'off' ]

theano/tensor/basic.py

@@ -20,7 +20,7 @@ from theano.gof import Apply, Constant, Op, Type, Value, Variable
 import elemwise
 from theano import scalar as scal
 from theano.gof.python25 import partial, any, all
-from theano.gof.op import get_test_value
+from theano.gof.op import get_test_value, missing_test_message
 from theano import compile, printing
 from theano.printing import pprint, min_informative_str
 
@@ -5227,23 +5227,27 @@ class Dot(Op):
             try:
                 iv0 = get_test_value(inputs[0])
             except AttributeError:
-                raise AttributeError('first input passed to Dot.R_op has no test value')
+                missing_test_message('first input passed to Dot.R_op has no test value')
+                debugger_available = False
 
             try:
                 iv1 = get_test_value(inputs[1])
             except AttributeError:
-                raise AttributeError('second input passed to Dot.R_op has no test value')
-
+                missing_test_message('second input passed to Dot.R_op has no test value')
+                debugger_available = False
 
             try:
                 ev0 = get_test_value(eval_points[0])
             except AttributeError:
-                raise AttributeError('first eval point passed to Dot.R_op has no test value')
+                missing_test_message('first eval point passed to Dot.R_op has no test value')
+                debugger_available = False
             try:
                 ev1 = get_test_value(eval_points[1])
             except AttributeError:
-                raise AttributeError('second eval point passed to Dot.R_op has no test value')
+                missing_test_message('second eval point passed to Dot.R_op has no test value')
+                debugger_available = False
 
+        if debugger_available:
             input_values = [ iv0, iv1]
             eval_point_values = [ ev0, ev1 ]