Removed the FAST_RUN_NOGC mode as we should not create new special string.

theano/compile/profilemode.py

@@ -86,9 +86,9 @@ class ProfileMode(Mode):
                 failure = run_cthunk(th.cthunk)
                 dt = time.time() - t0
                 if failure:
-                    raise RuntimeError(('A C Op raised an exception.  PROFILE_MODE cannot'
+                    raise RuntimeError(('A C Op raised an exception.  ProfileMode cannot'
                         ' tell you what it was though.  Use a standard mode such as'
-                        ' FAST_RUN_NOGC to correct the problem.'))
+                        ' FAST_RUN to correct the problem.'))
             else:
                 t0 = time.time()
                 th()
@@ -105,9 +105,9 @@ class ProfileMode(Mode):
                 failure = run_cthunk(th.cthunk)
                 dt = time.time() - t0
                 if failure:
-                    raise RuntimeError(('A C Op raised an exception.  PROFILE_MODE cannot'
+                    raise RuntimeError(('A C Op raised an exception.  ProfileMode cannot'
                         ' tell you what it was though.  Use a standard mode such as'
-                        ' FAST_RUN_NOGC to correct the problem.'))
+                        ' FAST_RUN to correct the problem.'))
             else:
                 t0 = time.time()
                 th()

theano/configdefaults.py

@@ -49,7 +49,7 @@ AddConfigVar('force_device',
 AddConfigVar('mode',
         "Default compilation mode",
         EnumStr('Mode', 'ProfileMode', 'DebugMode', 'FAST_RUN',
-                'FAST_RUN_NOGC', 'FAST_COMPILE', 'PROFILE_MODE', 'DEBUG_MODE'))
+                'FAST_COMPILE', 'PROFILE_MODE', 'DEBUG_MODE'))
 
 # Test whether or not gcc is present: disable C code if it is not
 try: