merge CreateVar and GetOrCreateVar

paddle/framework/scope.h

@@ -19,7 +19,6 @@ limitations under the License. */
 #include <vector>
 
 #include "paddle/framework/variable.h"
-#include "paddle/platform/assert.h"
 
 namespace paddle {
 namespace framework {
@@ -44,9 +43,13 @@ class Scope {
   /// Create Variable in this Scope. Failed if Variable already been
   /// created.
   Variable* CreateVariable(const std::string& name) {
-    PADDLE_ASSERT(!HasVariable(name));
-    vars_[name] = std::unique_ptr<Variable>(new Variable());
-    return GetVariable(name);
+    auto var = GetVariable(name);
+    if (var) {
+      return var;
+    } else {
+      vars_[name] = std::unique_ptr<Variable>(new Variable());
+      return GetVariable(name);
+    }
   }
 
   /// Get Variable from this Scope, this function will recursive find Variable
@@ -62,16 +65,6 @@ class Scope {
     }
   }
 
-  /// Get Variable from scope, if Variable is not exist, creat one and return.
-  Variable* GetOrCreateVariable(const std::string& name) {
-    auto var = GetVariable(name);
-    if (var) {
-      return var;
-    } else {
-      return CreateVariable(name);
-    }
-  }
-
   /// Find if there is a Variable in this scope and it's parent scope
   bool HasVariable(const std::string& name) const {
     return (vars_.find(name) != vars_.end() ||

paddle/framework/scope_test.cc

@@ -24,18 +24,22 @@ TEST(Scope, Create) {
   Variable* var0 = scope->CreateVariable("");
   EXPECT_NE(var0, nullptr);
 
+  /// GetVariable will return nullptr if not exist.
   Variable* var1 = scope->GetVariable("a");
   EXPECT_EQ(var1, nullptr);
 
+  /// CreateVariable will return one.
   Variable* var2 = scope->CreateVariable("a");
+  EXPECT_NE(var2, nullptr);
 
-  ASSERT_DEATH({ scope->CreateVariable("a"); }, "");
-
+  /// Get the created variable.
   Variable* var3 = scope->GetVariable("a");
   EXPECT_EQ(var2, var3);
 
-  Variable* var4 = scope->GetOrCreateVariable("a");
-  EXPECT_EQ(var2, var4);
+  /// CreateVariable will just return the variable if it's
+  /// already exist.
+  Variable* var4 = scope->CreateVariable("a");
+  EXPECT_EQ(var4, var2);
 }
 
 TEST(Scope, Parent) {
@@ -48,6 +52,7 @@ TEST(Scope, Parent) {
   Variable* var0 = parent_scope->CreateVariable("a");
   EXPECT_NE(var0, nullptr);
 
+  /// GetVariable will get Variable from parent scope if exist.
   Variable* var1 = scope->GetVariable("a");
   EXPECT_EQ(var0, var1);
 }