use kernel size in global_pooling. test=develop

paddle/fluid/operators/pool_op.cc

@@ -168,9 +168,10 @@ void Pool2dOpMaker::Make() {
                             "be ignored.");  // TODO(Chengduo): Add checker.
                                              // (Currently,
   // TypedAttrChecker don't support vector type.)
-  AddAttr<bool>("global_pooling",
-                "(bool, default false) Whether to use the global pooling. "
-                "If global_pooling = true, ksize and paddings will be ignored.")
+  AddAttr<bool>(
+      "global_pooling",
+      "(bool, default false) Whether to use the global pooling. "
+      "If global_pooling = true, kernel size and paddings will be ignored.")
       .SetDefault(false);
   AddAttr<std::vector<int>>("strides",
                             "(vector<int>, default {1, 1}), strides(height, "
@@ -182,7 +183,7 @@ void Pool2dOpMaker::Make() {
       "paddings",
       "(vector<int>, default {0,0}), paddings(height, width) of pooling "
       "operator."
-      "If global_pooling = true, paddings and ksize will be ignored.")
+      "If global_pooling = true, paddings and kernel size will be ignored.")
       .SetDefault({0, 0});
   AddAttr<bool>(
       "exclusive",
@@ -333,7 +334,7 @@ void Pool3dOpMaker::Make() {
   AddAttr<bool>(
       "global_pooling",
       "(bool, default false) Whether to use the global pooling. "
-      "If global_pooling = true, ksize and paddings will be ignored.")
+      "If global_pooling = true, kernel size and paddings will be ignored.")
       .SetDefault(false);
   AddAttr<std::vector<int>>(
       "strides",