[PHI decoupling] remove dependency on 2 header files in fluid from phi (#47842)

* rm "paddle/fluid/operators/eigen/eigen_function.h" in phi

* rm "paddle/fluid/operators/elementwise/elementwise_op_function.h" in phi

* Revert "rm "paddle/fluid/operators/elementwise/elementwise_op_function.h" in phi"

This reverts commit c4ba51225e3652f1d80925afba406612968f0ee9.

paddle/phi/kernels/cpu/scale_kernel.cc

@@ -21,8 +21,8 @@ limitations under the License. */
 #include "paddle/phi/kernels/funcs/eigen/common.h"
 
 // See Note [ Why still include the fluid headers? ]
-#include "paddle/fluid/operators/eigen/eigen_function.h"
 #include "paddle/phi/common/bfloat16.h"
+#include "paddle/phi/kernels/funcs/eigen/eigen_function.h"
 namespace phi {
 
 template <typename T, typename Context>
@@ -43,7 +43,7 @@ void ScaleKernel(const Context& dev_ctx,
   if (x.numel() <= 0 || (!x.IsInitialized())) {
     return;
   }
-  paddle::operators::EigenScale<std::decay_t<decltype(dev)>, T>::Eval(
+  phi::funcs::EigenScale<std::decay_t<decltype(dev)>, T>::Eval(
       dev,
       eigen_out,
       eigen_x,

paddle/phi/kernels/funcs/reduce_grad_functions.h

@@ -14,11 +14,11 @@
 
 #pragma once
 
-#include "paddle/fluid/operators/eigen/eigen_function.h"
 #include "paddle/phi/backends/cpu/cpu_context.h"
 #include "paddle/phi/core/dense_tensor.h"
 #include "paddle/phi/kernels/cpu/reduce.h"
 #include "paddle/phi/kernels/funcs/eigen/common.h"
+#include "paddle/phi/kernels/funcs/eigen/eigen_function.h"
 namespace phi {
 
 namespace funcs {

paddle/phi/kernels/gpu/dot_kernel.cu

@@ -19,8 +19,8 @@
 #include "paddle/phi/kernels/funcs/eigen/common.h"
 
 // See Note [ Why still include the fluid headers? ]
-#include "paddle/fluid/operators/eigen/eigen_function.h"
 #include "paddle/phi/common/complex.h"
+#include "paddle/phi/kernels/funcs/eigen/eigen_function.h"
 
 namespace phi {
 

paddle/phi/kernels/impl/dot_grad_kernel_impl.h

@@ -14,11 +14,11 @@ limitations under the License. */
 
 #pragma once
 
-#include "paddle/fluid/operators/eigen/eigen_function.h"
 #include "paddle/phi/core/dense_tensor.h"
 #include "paddle/phi/kernels/complex_kernel.h"
 #include "paddle/phi/kernels/funcs/complex_functors.h"
 #include "paddle/phi/kernels/funcs/eigen/common.h"
+#include "paddle/phi/kernels/funcs/eigen/eigen_function.h"
 
 namespace phi {
 

paddle/phi/kernels/impl/sign_kernel_impl.h

@@ -18,7 +18,7 @@ limitations under the License. */
 #include "paddle/phi/kernels/funcs/eigen/common.h"
 
 // See Note [ Why still include the fluid headers? ]
-#include "paddle/fluid/operators/eigen/eigen_function.h"
+#include "paddle/phi/kernels/funcs/eigen/eigen_function.h"
 
 namespace phi {
 
@@ -31,7 +31,7 @@ void SignKernel(const Context& dev_ctx,
   auto eigen_x = phi::EigenVector<T>::Flatten(x);
 
   auto& dev = *dev_ctx.eigen_device();
-  paddle::operators::EigenSign<std::decay_t<decltype(dev)>, T>::Eval(
+  phi::funcs::EigenSign<std::decay_t<decltype(dev)>, T>::Eval(
       dev, eigen_out, eigen_x);
 }