load op add seletedRows

paddle/fluid/operators/load_op.cc

@@ -44,6 +44,16 @@ class LoadOp : public framework::OperatorBase {
     PADDLE_ENFORCE(out_var != nullptr, "Output variable %s cannot be found",
                    out_var_name);
 
+    if (out_var->IsType<framework::LoDTensor>()) {
+      SaveLodTensor(filename, place, out_var);
+    } else if (out_var->IsType<framework::SelectedRows>()) {
+      SaveSelectedRows(filename, scope, place, out_var);
+    } else {
+      PADDLE_ENFORCE(
+          false,
+          "Load only support LoDTensor and SelectedRows, %s has wrong type",
+          iname);
+    }
     }
   }
 
@@ -91,7 +101,7 @@ class LoadOp : public framework::OperatorBase {
                         const platform::Place &place,
                         framework::Variable *var) const {
 
-    auto &selectedRows = var->Get<framework::SelectedRows>();
+    auto *selectedRows = var->GetMutable<framework::SelectedRows>();
 
     // get device context from pool
     platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();