fixed scan hashing issue

theano/sandbox/scan.py

@@ -13,29 +13,24 @@ def info(*msg):
     _logger.info('INFO theano.scan: '+' '.join(msg))
 
 
-# Hashing a list; list used by scan are list of numbers, therefore a list 
-# can be hashed by hashing all elements in the list
-def hash_list(list):
+# Hashing a dictionary or a list or a tuple or any type that is hashable with
+# the hash() function
+def hash_listsDictsTuples(x):
     hash_value = 0
-    for v in list:
-        hash_value ^= hash(v)
-    return hash_value
-
-
-# Hashing a dictionary; the dictionary used by scan has as keys numbers and 
-# as values either numbers or list of numbers
-def hash_dict(dictionary):
-    hash_value = 0
-    for k,v in dictionary.iteritems():
-        # hash key
-        hash_value ^= hash(k)
-        if type(v) in (list,tuple):
-            hash_value ^= hash_list(v)
-        else:
-            hash_value ^= hash(v)
+    if type(x) == dict :
+        for k,v in x.iteritems():
+            hash_value ^= hash_listsDictsTuples(k)
+            hash_value ^= hash_listsDictsTuples(v)
+    elif type(x) in (list,tuple):
+        for v in x:
+            hash_value ^= hash_listsDictsTuples(v)
+    else:
+      try:
+        hash_value ^= hash(x)
+      except:
+        pass
     return hash_value
 
-
 def scan(fn, sequences, initial_states, non_sequences, inplace_map={}, 
          sequences_taps={}, outputs_taps = {},
          n_steps = theano.tensor.zero(), force_gradient = False, 
@@ -268,13 +263,13 @@ class Scan(theano.Op):
              hash(self.go_backwards) ^\
              hash(self.truncate_gradient) ^\
              hash(self.n_args) ^ \
-             hash_list(self.outputs) ^ \
-             hash_list(self.inputs) ^ \
-             hash_list(self.g_ins) ^ \
-             hash_list(self.g_outs) ^ \
-             hash_dict(self.seqs_taps) ^\
-             hash_dict(self.outs_taps) ^\
-             hash_dict(self.updates)
+             hash_listsDictsTuples(self.outputs) ^ \
+             hash_listsDictsTuples(self.inputs) ^ \
+             hash_listsDictsTuples(self.g_ins) ^ \
+             hash_listsDictsTuples(self.g_outs) ^ \
+             hash_listsDictsTuples(self.seqs_taps) ^\
+             hash_listsDictsTuples(self.outs_taps) ^\
+             hash_listsDictsTuples(self.updates)