Fix segmentation fault bug in reduce ops (#22079)

* fix dim=[] bug in reduce ops

python/paddle/fluid/layers/nn.py

@@ -3882,9 +3882,9 @@ def reduce_sum(input, dim=None, keep_dim=False, name=None):
     if dim is not None and not isinstance(dim, list):
         dim = [dim]
     attrs = {
-        'dim': dim if dim != None else [0],
+        'dim': dim if dim != None and dim != [] else [0],
         'keep_dim': keep_dim,
-        'reduce_all': True if dim == None else False
+        'reduce_all': True if dim == None or dim == [] else False
     }
 
     if in_dygraph_mode():
@@ -3957,9 +3957,9 @@ def reduce_mean(input, dim=None, keep_dim=False, name=None):
     if dim is not None and not isinstance(dim, list):
         dim = [dim]
     attrs = {
-        'dim': dim if dim != None else [0],
+        'dim': dim if dim != None and dim != [] else [0],
         'keep_dim': keep_dim,
-        'reduce_all': True if dim == None else False
+        'reduce_all': True if dim == None or dim == [] else False
     }
 
     if in_dygraph_mode():
@@ -4034,9 +4034,9 @@ def reduce_max(input, dim=None, keep_dim=False, name=None):
         inputs={'X': input},
         outputs={'Out': out},
         attrs={
-            'dim': dim if dim != None else [0],
+            'dim': dim if dim != None and dim != [] else [0],
             'keep_dim': keep_dim,
-            'reduce_all': True if dim == None else False
+            'reduce_all': True if dim == None or dim == [] else False
         })
     return out
 
@@ -4095,9 +4095,9 @@ def reduce_min(input, dim=None, keep_dim=False, name=None):
         inputs={'X': input},
         outputs={'Out': out},
         attrs={
-            'dim': dim if dim != None else [0],
+            'dim': dim if dim != None and dim != [] else [0],
             'keep_dim': keep_dim,
-            'reduce_all': True if dim == None else False
+            'reduce_all': True if dim == None or dim == [] else False
         })
     return out
 
@@ -4157,9 +4157,9 @@ def reduce_prod(input, dim=None, keep_dim=False, name=None):
         inputs={'X': input},
         outputs={'Out': out},
         attrs={
-            'dim': dim if dim != None else [0],
+            'dim': dim if dim != None and dim != [] else [0],
             'keep_dim': keep_dim,
-            'reduce_all': True if dim == None else False
+            'reduce_all': True if dim == None or dim == [] else False
         })
     return out
 
@@ -4215,9 +4215,9 @@ def reduce_all(input, dim=None, keep_dim=False, name=None):
         inputs={'X': input},
         outputs={'Out': out},
         attrs={
-            'dim': dim if dim != None else [0],
+            'dim': dim if dim != None and dim != [] else [0],
             'keep_dim': keep_dim,
-            'reduce_all': True if dim == None else False
+            'reduce_all': True if dim == None or dim == [] else False
         })
     return out
 
@@ -4273,9 +4273,9 @@ def reduce_any(input, dim=None, keep_dim=False, name=None):
         inputs={'X': input},
         outputs={'Out': out},
         attrs={
-            'dim': dim if dim != None else [0],
+            'dim': dim if dim != None and dim != [] else [0],
             'keep_dim': keep_dim,
-            'reduce_all': True if dim == None else False
+            'reduce_all': True if dim == None or dim == [] else False
         })
     return out