add prefetch and onPassEnd to PaddleApi.h

Author: jacquesqiao

paddle/api/GradientMachine.cpp

@@ -64,6 +64,14 @@ GradientMachine* GradientMachine::createByModelConfig(
   return GradientMachine::createFromPaddleModelPtr(confPtr, mode, types);
 }
 
+void GradientMachine::onPassEnd() { m->machine->onPassEnd(); }
+
+void GradientMachine::prefetch(const Arguments& inArgs) {
+  auto& in =
+      m->cast<std::vector<paddle::Argument>>(inArgs.getInternalArgumentsPtr());
+  m->machine->prefetch(in);
+}
+
 void GradientMachine::forward(const Arguments& inArgs,
                               Arguments* outArgs,
                               PassType passType) {

paddle/api/PaddleAPI.h

@@ -714,6 +714,16 @@ class GradientMachine {
       GradientMatchineCreateMode mode = CREATE_MODE_NORMAL,
       const std::vector<int>& parameterTypes = defaultParamTypes);
 
+  /**
+   * Prefetch row ids of sparse parameter.
+   */
+  void prefetch(const Arguments& inArgs);
+
+  /**
+   * Do some thing when train pass ended.
+   */
+  void onPassEnd();
+
   /**
    * The forward stage of GradientMachine.
    *