Exempt np.random.mtrand.RandomState from NaN/inf/big_number checking in NanGuardMode.

theano/compile/nanguardmode.py

@@ -56,6 +56,8 @@ def contains_nan(arr):
     """
     if isinstance(arr, theano.gof.type.CDataType._cdata_type):
         return False
+    elif isinstance(arr, np.random.mtrand.RandomState):
+        return False
     return np.isnan(np.min(arr))
 
 
@@ -82,6 +84,8 @@ def contains_inf(arr):
     """
     if isinstance(arr, theano.gof.type.CDataType._cdata_type):
         return False
+    elif isinstance(arr, np.random.mtrand.RandomState):
+        return False
     return np.isinf(np.nanmax(arr)) or np.isinf(np.nanmin(arr))
 
 
@@ -164,6 +168,8 @@ class NanGuardMode(Mode):
                     err = (self.gpuabsmax(var.reshape(var.size)) > 1e10)
                 elif isinstance(var, theano.gof.type.CDataType._cdata_type):
                     err = False
+                elif isinstance(var, np.random.mtrand.RandomState):
+                    err = False
                 else:
                     err = (np.abs(var).max() > 1e10)
                 if err: