Make deprecation warnings print only once

theano/compile/module.py

@@ -23,10 +23,18 @@ import mode as get_mode
 #parts of theano do "from module import *"
 #So rather than printing out a warning if you import from this module, we
 #must stick a warning inside all of the components
+
 def deprecation_warning():
-    warnings.warn("theano modules are deprecated and will be removed in release 0.7",
-        stacklevel = 3)
+    # Make sure the warning is displayed only once.
+    if deprecation_warning.already_displayed:
+        return
+
+    warnings.warn(
+            "theano modules are deprecated and will be removed in release 0.7",
+            stacklevel=3)
+    deprecation_warning.already_displayed = True
 
+deprecation_warning.already_displayed = False
 
 
 def name_join(*args):

theano/tensor/randomstreams.py

@@ -11,8 +11,20 @@ from theano.gof import Container
 from theano.tensor import raw_random
 import warnings
 
+
 def deprecation_warning():
-    warnings.warn("RandomStreams is deprecated and will be removed in release 0.7. Use shared_randomstreams.RandomStreams or MRG_RandomStreams instead.",stacklevel = 3)
+    # Make sure the warning is displayed only once.
+    if deprecation_warning.already_displayed:
+        return
+
+    warnings.warn((
+        "RandomStreams is deprecated and will be removed in release 0.7. "
+        "Use shared_randomstreams.RandomStreams or "
+        "MRG_RandomStreams instead."),
+        stacklevel=3)
+    deprecation_warning.already_displayed = True
+
+deprecation_warning.already_displayed = False
 
 
 class RandomStreamsInstance(object):