Define specific exceptions

theano/compile/function_module.py

@@ -21,6 +21,12 @@ import logging
 _logger = logging.getLogger('theano.compile.function_module')
 
 
+class UnusedInputError(Exception):
+    """
+    A symbolic input passed to function is not needed
+    """
+    pass
+
 def alias_root(v):
     """Return the variable to which v is aliased by view_maps and destroy_maps"""
     if v.owner is None: return v
@@ -1110,7 +1116,7 @@ class FunctionMaker(object):
                 if on_unused_input == 'warn':
                     warnings.warn(msg % (i.variable, warn_msg), stacklevel=5)
                 elif on_unused_input == 'raise':
-                    raise ValueError(msg % (i.variable, err_msg))
+                    raise UnusedInputError(msg % (i.variable, err_msg))
                 else:
                     raise ValueError(("Invalid value for keyword "
                         "on_unused_input of theano.function: '%s'. "

theano/compile/pfunc.py

@@ -7,6 +7,7 @@ from profiling import ProfileStats
 
 from theano import config
 from theano.compile import orig_function, In, Out
+from theano.compile import UnusedInputError
 from theano.compile.sharedvalue import SharedVariable, shared
 from theano.gof import Container, Variable, generic, graph, Constant, Value
 from theano.gof.python25 import any
@@ -432,7 +433,7 @@ def pfunc(params, outputs=None, mode=None, updates=[], givens=[],
     for i, v in enumerate(in_variables):
         if v in in_variables[(i + 1):]:
             dup_v_i = in_variables.index(v, (i + 1))
-            raise ValueError(
+            raise UnusedInputError(
                     ("Variable %s is used twice in inputs to theano.function, "
                      "at indices %i and %i.  This would result in values "
                      "provided for it being ignored. Please do not duplicate "

theano/compile/tests/test_function_module.py

@@ -8,6 +8,8 @@ from theano import gof,config
 from theano.scalar import mul
 from theano.compile.io import In, Out
 from theano.compile import function
+from theano.compile import UnusedInputError
+from theano.gof import MissingInputError
 from theano.gof.python25 import all, any
 
 from theano import tensor
@@ -53,56 +55,53 @@ class T_function(unittest.TestCase):
 
     def test_missing_inputs(self):
 
-        MissingInputException = TypeError
-        UnusedInputException = ValueError
-
         def fn():
             x,s = T.scalars('xs')
             fn = function([], [x])
-        checkfor(self, fn, MissingInputException)
+        checkfor(self, fn, MissingInputError)
 
         def fn():
             x,s = T.scalars('xs')
             # Ignore unused input s, as it hides the other error
             fn = function([s], [x], on_unused_input='ignore')
-        checkfor(self, fn, MissingInputException)
+        checkfor(self, fn, MissingInputError)
 
         def fn():
             x,s = T.scalars('xs')
             fn = function([s], [x])
-        checkfor(self, fn, UnusedInputException)
+        checkfor(self, fn, UnusedInputError)
 
         def fn():
             x,s = T.scalars('xs')
             # Ignore unused input s, as it hides the other error
             fn = function([s], x, on_unused_input='ignore')
-        checkfor(self, fn, MissingInputException)
+        checkfor(self, fn, MissingInputError)
 
         def fn():
             x,s = T.scalars('xs')
             fn = function([s], x)
-        checkfor(self, fn, UnusedInputException)
+        checkfor(self, fn, UnusedInputError)
 
         def fn():
             x,s = T.scalars('xs')
             # Ignore unused input s, as it hides the other error
             fn = function([s], Out(x), on_unused_input='ignore')
-        checkfor(self, fn, MissingInputException)
+        checkfor(self, fn, MissingInputError)
 
         def fn():
             x,s = T.scalars('xs')
             fn = function([s], Out(x))
-        checkfor(self, fn, UnusedInputException)
+        checkfor(self, fn, UnusedInputError)
 
         def fn():
             x,s = T.scalars('xs')
             fn = function([In(x, update=s+x)], x)
-        checkfor(self, fn, MissingInputException)
+        checkfor(self, fn, MissingInputError)
 
         def fn():
             x,s = T.scalars('xs')
             fn = function([In(x, update=mul(s,s)+x)], x)
-        checkfor(self, fn, MissingInputException)
+        checkfor(self, fn, MissingInputError)
 
     def test_input_anon_singleton(self):
         x,s = T.scalars('xs')
@@ -378,14 +377,14 @@ class T_function(unittest.TestCase):
     def test_disconnected_input(self):
         a = T.scalar('a')
         v = T.vector('v')
-        self.assertRaises(ValueError, function, [a, v], v*2)
+        self.assertRaises(UnusedInputError, function, [a, v], v*2)
         f = function([a, v], v*2, on_unused_input='ignore')
 
     def test_masked_input(self):
         m = T.matrix('m')
         mt = m.T
         mt.name = 'm.T'
-        self.assertRaises(ValueError, function, [m, mt], mt*2)
+        self.assertRaises(UnusedInputError, function, [m, mt], mt*2)
         f = function([m, mt], mt*2, on_unused_input='ignore')
 
 

theano/gof/__init__.py

@@ -6,7 +6,7 @@ from cc import \
 import compiledir # adds config vars
 
 from env import \
-    InconsistencyError, Env
+    InconsistencyError, MissingInputError, Env
 
 from destroyhandler import \
     DestroyHandler 

theano/gof/env.py

@@ -15,6 +15,12 @@ class InconsistencyError(Exception):
     """
     pass
 
+class MissingInputError(Exception):
+    """
+    A symbolic input needed to compute the outputs is missing.
+    """
+    pass
+
 
 
 class Env(utils.object2):
@@ -213,7 +219,7 @@ class Env(utils.object2):
                 self.__import__(node)
         for r in variables:
             if r.owner is None and not isinstance(r, graph.Value) and r not in self.inputs:
-                raise TypeError("Undeclared input", r)
+                raise MissingInputError("Undeclared input", r)
             if not getattr(r, 'env', None) is self:
                 self.__setup_r__(r)
             self.variables.add(r)
@@ -285,12 +291,19 @@ class Env(utils.object2):
                             #handler code in the first place
                             assert path is not None
 
-                            raise TypeError('A variable that is an input to the graph was neither provided as an '
-                                    'input to the function nor given a value. A chain of variables leading from '
-                                    'this input to an output is '+str(path)+'. This chain may not be unique')
+                            raise MissingInputError((
+                                'A variable that is an input to the graph was '
+                                'neither provided as an input to the function '
+                                'nor given a value. A chain of variables '
+                                'leading from this input to an output is %s. '
+                                'This chain may not be unique' % str(path)))
 
                         #Standard error message
-                        raise TypeError("An input of the graph, used to compute "+str(node)+", was not provided and not given a value", r)
+                        raise MissingInputError((
+                            "An input of the graph, used to compute %s, "
+                            "was not provided and not given a value"
+                            % str(node)),
+                            r)
 
         for node in new_nodes:
             assert node not in self.nodes