Using input.place() in GetExpectedKernel in slice_op (#25595)

* modify GetExpectedKernelType

* use input place

* add ENFORCE check

paddle/fluid/operators/slice_op.cc

@@ -148,9 +148,17 @@ class SliceOp : public framework::OperatorWithKernel {
  protected:
   framework::OpKernelType GetExpectedKernelType(
       const framework::ExecutionContext &ctx) const override {
+    auto *in_var = ctx.InputVar("Input");
+    if (in_var->IsType<framework::LoDTensor>()) {
+      auto &in_tensor = in_var->Get<framework::LoDTensor>();
+      PADDLE_ENFORCE_EQ(
+          in_tensor.IsInitialized(), true,
+          platform::errors::InvalidArgument(
+              "The tensor Input (Input) of Slice op is not initialized."));
+      return framework::OpKernelType(in_tensor.type(), in_tensor.place());
+    }
     return framework::OpKernelType(
-        OperatorWithKernel::IndicateVarDataType(ctx, "Input"),
-        ctx.device_context());
+        OperatorWithKernel::IndicateVarDataType(ctx, "Input"), ctx.GetPlace());
   }
   framework::OpKernelType GetKernelTypeForVar(
       const std::string &var_name, const Tensor &tensor,