revert reshape op infershape (#39946)

paddle/fluid/operators/reshape_op.cc

@@ -476,6 +476,21 @@ class Reshape2Op : public ReshapeOp {
              const framework::VariableNameMap &outputs,
              const framework::AttributeMap &attrs)
       : ReshapeOp(type, inputs, outputs, attrs) {}
+  void InferShape(framework::InferShapeContext *ctx) const override {
+    PADDLE_ENFORCE_EQ(ctx->HasOutput("XShape"), true,
+                      platform::errors::InvalidArgument(
+                          "Output(XShape) of ReshapeOp should not be null."));
+    const auto &x_dims = ctx->GetInputDim("X");
+    std::vector<int64_t> xshape_dims(x_dims.size() + 1);
+    xshape_dims[0] = 0;
+    for (int i = 0; i < x_dims.size(); ++i) {
+      xshape_dims[i + 1] = x_dims[i];
+    }
+    ctx->SetOutputDim("XShape", phi::make_ddim(xshape_dims));
+    ctx->ShareLoD("X", /*->*/ "XShape");
+
+    ReshapeOp::InferShape(ctx);
+  }
 };
 
 class Reshape2OpMaker : public ReshapeOpMaker {
@@ -636,13 +651,10 @@ REGISTER_OP_CPU_KERNEL_FUNCTOR(reshape_grad, float, ops::ReshapeGradKernel,
                                ops::ReshapeGradKernel, int64_t,
                                ops::ReshapeGradKernel);
 
-DELCARE_INFER_SHAPE_FUNCTOR(reshape2, ReshapeInferShapeFunctor,
-                            PT_INFER_META(phi::ReshapeWithXShapeInferMeta));
-
 REGISTER_OPERATOR(reshape2, ops::Reshape2Op, ops::Reshape2OpMaker,
                   ops::Reshape2GradMaker<paddle::framework::OpDesc>,
                   ops::Reshape2GradMaker<paddle::imperative::OpBase>,
-                  ReshapeInferShapeFunctor, ops::ReshapeOpInplaceInferer);
+                  ops::ReshapeOpInplaceInferer);
 REGISTER_OPERATOR(reshape2_grad, ops::Reshape2GradOp,
                   ops::Reshape2DoubleGradMaker<paddle::framework::OpDesc>,
                   ops::Reshape2DoubleGradMaker<paddle::imperative::OpBase>,