Move Abs InferShape to phi (#39762)

* Move Abs InferShaper to phi

* Fix CI error

paddle/fluid/operators/abs_op.cc

@@ -16,7 +16,10 @@
 #include <string>
 #include <unordered_map>
 #include <vector>
+#include "paddle/fluid/framework/infershape_utils.h"
 #include "paddle/fluid/framework/op_registry.h"
+#include "paddle/phi/core/infermeta_utils.h"
+#include "paddle/phi/infermeta/unary.h"
 #ifdef PADDLE_WITH_MKLDNN
 #include "paddle/fluid/platform/mkldnn_helper.h"
 #endif
@@ -27,16 +30,6 @@ namespace operators {
 class AbsOp : public framework::OperatorWithKernel {
  public:
   using framework::OperatorWithKernel::OperatorWithKernel;
-
-  void InferShape(framework::InferShapeContext* ctx) const override {
-    OP_INOUT_CHECK(ctx->HasInput("X"), "Input", "X", "abs");
-    OP_INOUT_CHECK(ctx->HasOutput("Out"), "Output", "Out", "abs");
-
-    auto in_dims = ctx->GetInputDim("X");
-
-    ctx->SetOutputDim("Out", in_dims);
-    ctx->ShareLoD("X", /*->*/ "Out");
-  }
 };
 
 class AbsOpMaker : public framework::OpProtoAndCheckerMaker {
@@ -148,11 +141,15 @@ class AbsDoubleGradOp : public framework::OperatorWithKernel {
 }  // namespace operators
 }  // namespace paddle
 
+DELCARE_INFER_SHAPE_FUNCTOR(abs, AbsInferShapeFunctor,
+                            PT_INFER_META(phi::UnchangedInferMeta));
+
 namespace ops = paddle::operators;
 
 REGISTER_OPERATOR(abs, ops::AbsOp, ops::AbsOpMaker,
                   ops::AbsGradMaker<paddle::framework::OpDesc>,
-                  ops::AbsGradMaker<paddle::imperative::OpBase>);
+                  ops::AbsGradMaker<paddle::imperative::OpBase>,
+                  AbsInferShapeFunctor);
 
 REGISTER_OPERATOR(abs_grad, ops::AbsGradOp,
                   ops::AbsDoubleGradMaker<paddle::framework::OpDesc>,