follow comment

python/paddle/fluid/layers/nn.py

@@ -1431,8 +1431,8 @@ def sequence_last_step(input):
 
 
 def pool2d(input,
-           pool_size,
-           pool_type,
+           pool_size=-1,
+           pool_type="max",
            pool_stride=1,
            pool_padding=0,
            global_pooling=False,
@@ -1447,6 +1447,11 @@ def pool2d(input,
             "Unknown pool_type: '%s'. It can only be 'max' or 'avg'.",
             str(pool_type))
 
+    if global_pooling is False and pool_size == -1:
+        raise ValueError(
+            "When the global_pooling is False, pool_size must be passed "
+            "and be a valid value. Received pool_size: " + str(pool_size))
+
     pool_size = utils.convert_to_list(pool_size, 2, 'pool_size')
     pool_padding = utils.convert_to_list(pool_padding, 2, 'pool_padding')
     pool_stride = utils.convert_to_list(pool_stride, 2, 'pool_stride')

python/paddle/fluid/layers/utils.py

@@ -47,7 +47,7 @@ def convert_to_list(value, n, name):
                 int(single_value)
             except (ValueError, TypeError):
                 raise ValueError(
-                    "The " + name + "'s must be a list or tuple of " + str(
+                    "The " + name + "'s type must be a list or tuple of " + str(
                         n) + " integers. Received: " + str(value) + " "
                     "including element " + str(single_value) + " of type" + " "
                     + str(type(single_value)))