modify load op

paddle/fluid/operators/checkpoint_load_op.cc

@@ -62,7 +62,7 @@ class CheckpointLoadOp : public framework::OperatorBase {
       return;
     }
 
-    auto inp_var_names = Output("Out");
+    auto inp_var_names = Inputs("X");
     PADDLE_ENFORCE_GT(static_cast<int>(inp_var_names.size()), 0,
                       "The number of input variables should be greater than 0");
     // get device context from pool
@@ -102,7 +102,10 @@ class CheckpointLoadOpProtoMaker : public framework::OpProtoAndCheckerMaker {
  public:
   CheckpointLoadOpProtoMaker(OpProto *proto, OpAttrChecker *op_checker)
       : OpProtoAndCheckerMaker(proto, op_checker) {
-    AddOutput("Out", "(Tensor) The tensor need to be loaded");
+    AddInput(
+        "X",
+        "(vector) Input LoDTensors that need to be saved together in a file.")
+        .AsDuplicable();
     AddComment(R"DOC(
 CheckpointLoad operator