Fix PostOp dependency

In general src headers should not be included in any public header of
other modules.

Since there are modules (graph, tests) that rely on specific PostOp definitions
in the previous src/core/experimental/PostOp.h, export it to the public
arm_compute header

Resolves COMPMID-4974

Signed-off-by: SiCongLi <sicong.li@arm.com>
Change-Id: I0fa4da5108a34fe6bfff1e9d57839da4e51dc314
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6673
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/experimental/PostOp.h b/arm_compute/core/experimental/PostOps.h
similarity index 65%
rename from src/core/experimental/PostOp.h
rename to arm_compute/core/experimental/PostOps.h
index b29f67e..4ea90fc 100644
--- a/src/core/experimental/PostOp.h
+++ b/arm_compute/core/experimental/PostOps.h
@@ -21,22 +21,23 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-#ifndef ARM_COMPUTE_EXPERIMENTAL_POSTOP
-#define ARM_COMPUTE_EXPERIMENTAL_POSTOP
+#ifndef ARM_COMPUTE_EXPERIMENTAL_POSTOPS
+#define ARM_COMPUTE_EXPERIMENTAL_POSTOPS
 
 #include "arm_compute/core/experimental/IPostOp.h"
 
 #include "arm_compute/core/Types.h"
-#include "arm_compute/core/experimental/Types.h"
-#include "support/Cast.h"
 
 #include <vector>
 
-/** (EXPERIMENTAL_POST_OPS) */
 namespace arm_compute
 {
 namespace experimental
 {
+/** (EXPERIMENTAL_POST_OPS)
+ * Implementation of specific IPostOps
+*/
+
 template <typename TensorRelatedT>
 struct PostOpAct : public IPostOp<TensorRelatedT>
 {
@@ -156,63 +157,6 @@
     int            _prev_dst_pos;
     ConvertPolicy  _policy;
 };
-
-/** Transform a PostOpList of type FromTensorT to one of type ToTensorT */
-template <typename FromTensorT, typename ToTensorT>
-PostOpList<ToTensorT> transform_post_op_list_arguments(const PostOpList<FromTensorT> &post_ops, std::function<ToTensorT(FromTensorT)> transform_arg)
-{
-    PostOpList<ToTensorT> transformed_post_ops;
-    int                   op_idx = 0;
-    for(const auto &post_op : post_ops.get_list())
-    {
-        switch(post_op->type())
-        {
-            case PostOpType::Activation:
-            {
-                const auto _post_op = utils::cast::polymorphic_downcast<const PostOpAct<FromTensorT> *>(post_op.get());
-                transformed_post_ops.template push_back_op<PostOpAct<ToTensorT>>(_post_op->_act_info);
-                break;
-            }
-            case PostOpType::Eltwise_Add:
-            {
-                const auto _post_op = utils::cast::polymorphic_downcast<const PostOpEltwiseAdd<FromTensorT> *>(post_op.get());
-                transformed_post_ops.template push_back_op<PostOpEltwiseAdd<ToTensorT>>(transform_arg(_post_op->_addend), _post_op->_prev_dst_pos, _post_op->_policy);
-                break;
-            }
-            case PostOpType::Eltwise_PRelu:
-            {
-                const auto _post_op = utils::cast::polymorphic_downcast<const PostOpEltwisePRelu<FromTensorT> *>(post_op.get());
-                transformed_post_ops.template push_back_op<PostOpEltwisePRelu<ToTensorT>>(transform_arg(_post_op->_alpha_param), _post_op->_prev_dst_pos, _post_op->_policy);
-                break;
-            }
-            default:
-            {
-                ARM_COMPUTE_ERROR("Unsupported PostOpType");
-            }
-        }
-        ++op_idx;
-    }
-    return transformed_post_ops;
-}
-
-/** Get post op argument TensorType from post op argument index in a flattened, ordered post op argument list */
-inline TensorType get_post_op_arg_type(size_t index)
-{
-    ARM_COMPUTE_ERROR_ON_MSG(static_cast<int>(index) > EXPERIMENTAL_ACL_POST_OP_ARG_LAST - EXPERIMENTAL_ACL_POST_OP_ARG_FIRST, "Post Op argument index is out of range");
-    return static_cast<TensorType>(EXPERIMENTAL_ACL_POST_OP_ARG_FIRST + static_cast<int>(index));
-}
-
-template <typename T>
-PostOpTypeSequence get_post_op_sequence(const PostOpList<T> &post_ops)
-{
-    PostOpTypeSequence post_op_sequence;
-    for(const auto &op : post_ops.get_list())
-    {
-        post_op_sequence.push_back(op->type());
-    }
-    return post_op_sequence;
-}
-
 } // namespace experimental
 } // namespace arm_compute
-#endif //ARM_COMPUTE_EXPERIMENTAL_POSTOP
+#endif //ARM_COMPUTE_EXPERIMENTAL_POSTOPS
\ No newline at end of file
diff --git a/arm_compute/graph/backends/FunctionHelpers.h b/arm_compute/graph/backends/FunctionHelpers.h
index 55af056..1e420a8 100644
--- a/arm_compute/graph/backends/FunctionHelpers.h
+++ b/arm_compute/graph/backends/FunctionHelpers.h
@@ -24,6 +24,8 @@
 #ifndef ARM_COMPUTE_GRAPH_BACKENDS_DETAIL_FUNCTION_HELPERS_H
 #define ARM_COMPUTE_GRAPH_BACKENDS_DETAIL_FUNCTION_HELPERS_H
 
+#include "arm_compute/core/experimental/IPostOp.h"
+#include "arm_compute/core/experimental/PostOps.h"
 #include "arm_compute/graph/Logger.h"
 #include "arm_compute/graph/Tensor.h"
 #include "arm_compute/graph/TypePrinter.h"
diff --git a/src/core/CL/CLUtils.cpp b/src/core/CL/CLUtils.cpp
index 8dab8aa..5de9a55 100644
--- a/src/core/CL/CLUtils.cpp
+++ b/src/core/CL/CLUtils.cpp
@@ -28,7 +28,7 @@
 #include "support/StringSupport.h"
 
 #include "src/core/CL/CLUtils.h"
-#include "src/core/experimental/PostOp.h"
+#include "src/core/experimental/PostOpUtils.h"
 
 namespace arm_compute
 {
diff --git a/src/core/experimental/PostOpUtils.h b/src/core/experimental/PostOpUtils.h
new file mode 100644
index 0000000..53795db
--- /dev/null
+++ b/src/core/experimental/PostOpUtils.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_EXPERIMENTAL_POSTOPUTILS
+#define ARM_COMPUTE_EXPERIMENTAL_POSTOPUTILS
+
+#include "arm_compute/core/experimental/IPostOp.h"
+#include "arm_compute/core/experimental/PostOps.h"
+
+#include "arm_compute/core/experimental/Types.h"
+#include "support/Cast.h"
+
+#include <vector>
+
+/** (EXPERIMENTAL_POST_OPS) */
+namespace arm_compute
+{
+namespace experimental
+{
+/** Transform a PostOpList of type FromTensorT to one of type ToTensorT */
+template <typename FromTensorT, typename ToTensorT>
+PostOpList<ToTensorT> transform_post_op_list_arguments(const PostOpList<FromTensorT> &post_ops, std::function<ToTensorT(FromTensorT)> transform_arg)
+{
+    PostOpList<ToTensorT> transformed_post_ops;
+    int                   op_idx = 0;
+    for(const auto &post_op : post_ops.get_list())
+    {
+        switch(post_op->type())
+        {
+            case PostOpType::Activation:
+            {
+                const auto _post_op = utils::cast::polymorphic_downcast<const PostOpAct<FromTensorT> *>(post_op.get());
+                transformed_post_ops.template push_back_op<PostOpAct<ToTensorT>>(_post_op->_act_info);
+                break;
+            }
+            case PostOpType::Eltwise_Add:
+            {
+                const auto _post_op = utils::cast::polymorphic_downcast<const PostOpEltwiseAdd<FromTensorT> *>(post_op.get());
+                transformed_post_ops.template push_back_op<PostOpEltwiseAdd<ToTensorT>>(transform_arg(_post_op->_addend), _post_op->_prev_dst_pos, _post_op->_policy);
+                break;
+            }
+            case PostOpType::Eltwise_PRelu:
+            {
+                const auto _post_op = utils::cast::polymorphic_downcast<const PostOpEltwisePRelu<FromTensorT> *>(post_op.get());
+                transformed_post_ops.template push_back_op<PostOpEltwisePRelu<ToTensorT>>(transform_arg(_post_op->_alpha_param), _post_op->_prev_dst_pos, _post_op->_policy);
+                break;
+            }
+            default:
+            {
+                ARM_COMPUTE_ERROR("Unsupported PostOpType");
+            }
+        }
+        ++op_idx;
+    }
+    return transformed_post_ops;
+}
+
+/** Get post op argument TensorType from post op argument index in a flattened, ordered post op argument list */
+inline TensorType get_post_op_arg_type(size_t index)
+{
+    ARM_COMPUTE_ERROR_ON_MSG(static_cast<int>(index) > EXPERIMENTAL_ACL_POST_OP_ARG_LAST - EXPERIMENTAL_ACL_POST_OP_ARG_FIRST, "Post Op argument index is out of range");
+    return static_cast<TensorType>(EXPERIMENTAL_ACL_POST_OP_ARG_FIRST + static_cast<int>(index));
+}
+
+/** Get a sequence of PostOp Types from PostOpList */
+template <typename T>
+PostOpTypeSequence get_post_op_sequence(const PostOpList<T> &post_ops)
+{
+    PostOpTypeSequence post_op_sequence;
+    for(const auto &op : post_ops.get_list())
+    {
+        post_op_sequence.push_back(op->type());
+    }
+    return post_op_sequence;
+}
+
+} // namespace experimental
+} // namespace arm_compute
+#endif //ARM_COMPUTE_EXPERIMENTAL_POSTOPUTILS
diff --git a/src/gpu/cl/kernels/ClGemmMatrixMultiplyNativeKernel.cpp b/src/gpu/cl/kernels/ClGemmMatrixMultiplyNativeKernel.cpp
index 350312f..af79435 100644
--- a/src/gpu/cl/kernels/ClGemmMatrixMultiplyNativeKernel.cpp
+++ b/src/gpu/cl/kernels/ClGemmMatrixMultiplyNativeKernel.cpp
@@ -34,7 +34,7 @@
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "src/core/AccessWindowStatic.h"
 #include "src/core/CL/CLUtils.h"
-#include "src/core/experimental/PostOp.h"
+#include "src/core/experimental/PostOpUtils.h"
 #include "src/core/helpers/AutoConfiguration.h"
 #include "src/core/helpers/WindowHelpers.h"
 #include "src/core/utils/helpers/float_ops.h"
diff --git a/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedKernel.cpp b/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedKernel.cpp
index 52c8cd4..64e9933 100644
--- a/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedKernel.cpp
+++ b/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedKernel.cpp
@@ -34,7 +34,7 @@
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "src/core/CL/CLUtils.h"
 #include "src/core/CL/CLValidate.h"
-#include "src/core/experimental/PostOp.h"
+#include "src/core/experimental/PostOpUtils.h"
 #include "src/core/helpers/AutoConfiguration.h"
 #include "src/core/helpers/WindowHelpers.h"
 #include "src/core/utils/helpers/float_ops.h"
diff --git a/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedOnlyRhsKernel.cpp b/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedOnlyRhsKernel.cpp
index 633c263..aa80697 100644
--- a/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedOnlyRhsKernel.cpp
+++ b/src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedOnlyRhsKernel.cpp
@@ -27,7 +27,7 @@
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "src/core/CL/CLUtils.h"
 #include "src/core/CL/CLValidate.h"
-#include "src/core/experimental/PostOp.h"
+#include "src/core/experimental/PostOpUtils.h"
 #include "src/core/helpers/AutoConfiguration.h"
 #include "src/core/helpers/WindowHelpers.h"
 #include "src/core/utils/helpers/float_ops.h"
diff --git a/src/runtime/CL/functions/CLConvolutionLayer.cpp b/src/runtime/CL/functions/CLConvolutionLayer.cpp
index d75f54f..20d7292 100644
--- a/src/runtime/CL/functions/CLConvolutionLayer.cpp
+++ b/src/runtime/CL/functions/CLConvolutionLayer.cpp
@@ -29,6 +29,7 @@
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "arm_compute/runtime/CL/functions/CLFFTConvolutionLayer.h"
 #include "src/core/CL/ICLKernel.h"
+#include "src/core/experimental/PostOpUtils.h"
 #include "src/core/helpers/MemoryHelpers.h"
 #include "src/gpu/cl/operators/ClConv2d.h"
 
diff --git a/src/runtime/CL/functions/CLGEMMConvolutionLayer.cpp b/src/runtime/CL/functions/CLGEMMConvolutionLayer.cpp
index 1eabee6..ad5bfd8 100644
--- a/src/runtime/CL/functions/CLGEMMConvolutionLayer.cpp
+++ b/src/runtime/CL/functions/CLGEMMConvolutionLayer.cpp
@@ -31,7 +31,7 @@
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "arm_compute/core/utils/quantization/AsymmHelpers.h"
 #include "arm_compute/runtime/CL/CLScheduler.h"
-#include "src/core/experimental/PostOp.h"
+#include "src/core/experimental/PostOpUtils.h"
 #include "src/core/helpers/MemoryHelpers.h"
 #include "src/gpu/cl/operators/ClGemmConv2d.h"
 #include "support/Cast.h"
diff --git a/tests/validation/CL/ConvolutionLayer.cpp b/tests/validation/CL/ConvolutionLayer.cpp
index ff28ac0..10b6707 100644
--- a/tests/validation/CL/ConvolutionLayer.cpp
+++ b/tests/validation/CL/ConvolutionLayer.cpp
@@ -22,12 +22,12 @@
  * SOFTWARE.
  */
 #include "arm_compute/core/Types.h"
+#include "arm_compute/core/experimental/PostOps.h"
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "arm_compute/runtime/CL/CLTensor.h"
 #include "arm_compute/runtime/CL/CLTensorAllocator.h"
 #include "arm_compute/runtime/CL/functions/CLConvolutionLayer.h"
 #include "arm_compute/runtime/CL/functions/CLGEMMConvolutionLayer.h"
-#include "src/core/experimental/PostOp.h"
 #include "tests/CL/CLAccessor.h"
 #include "tests/PaddingCalculator.h"
 #include "tests/datasets/LargeConvolutionLayerDataset.h"
diff --git a/tests/validation/CL/GEMMMatrixMultiplyReshaped.cpp b/tests/validation/CL/GEMMMatrixMultiplyReshaped.cpp
index 37e25e9..e75a352 100644
--- a/tests/validation/CL/GEMMMatrixMultiplyReshaped.cpp
+++ b/tests/validation/CL/GEMMMatrixMultiplyReshaped.cpp
@@ -23,10 +23,10 @@
  */
 #include "arm_compute/core/KernelDescriptors.h"
 #include "arm_compute/core/Types.h"
+#include "arm_compute/core/experimental/PostOps.h"
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "arm_compute/runtime/CL/CLTensor.h"
 #include "arm_compute/runtime/CL/CLTensorAllocator.h"
-#include "src/core/experimental/PostOp.h"
 #include "src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedKernel.h"
 #include "src/gpu/cl/kernels/ClGemmReshapeLhsMatrixKernel.h"
 #include "src/gpu/cl/kernels/ClGemmReshapeRhsMatrixKernel.h"
diff --git a/tests/validation/CL/GEMMMatrixMultiplyReshapedOnlyRHS.cpp b/tests/validation/CL/GEMMMatrixMultiplyReshapedOnlyRHS.cpp
index 4c482b4..ca63d3a 100644
--- a/tests/validation/CL/GEMMMatrixMultiplyReshapedOnlyRHS.cpp
+++ b/tests/validation/CL/GEMMMatrixMultiplyReshapedOnlyRHS.cpp
@@ -23,10 +23,10 @@
  */
 #include "arm_compute/core/KernelDescriptors.h"
 #include "arm_compute/core/Types.h"
+#include "arm_compute/core/experimental/PostOps.h"
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "arm_compute/runtime/CL/CLTensor.h"
 #include "arm_compute/runtime/CL/CLTensorAllocator.h"
-#include "src/core/experimental/PostOp.h"
 #include "src/gpu/cl/kernels/ClGemmMatrixMultiplyReshapedOnlyRhsKernel.h"
 #include "src/gpu/cl/kernels/ClGemmReshapeRhsMatrixKernel.h"
 #include "tests/CL/CLAccessor.h"
diff --git a/tests/validation/fixtures/GEMMFixture.h b/tests/validation/fixtures/GEMMFixture.h
index fa27301..52cd675 100644
--- a/tests/validation/fixtures/GEMMFixture.h
+++ b/tests/validation/fixtures/GEMMFixture.h
@@ -28,7 +28,7 @@
 #include "arm_compute/core/TensorShape.h"
 #include "arm_compute/core/Types.h"
 #include "arm_compute/core/experimental/IPostOp.h"
-#include "src/core/experimental/PostOp.h"
+#include "src/core/experimental/PostOpUtils.h"
 #include "tests/AssetsLibrary.h"
 #include "tests/Globals.h"
 #include "tests/IAccessor.h"
diff --git a/tests/validation/reference/PostOps.cpp b/tests/validation/reference/PostOps.cpp
index a81b1c1..ecfed4c 100644
--- a/tests/validation/reference/PostOps.cpp
+++ b/tests/validation/reference/PostOps.cpp
@@ -25,7 +25,8 @@
 
 #include "arm_compute/core/Helpers.h"
 #include "arm_compute/core/Types.h"
-#include "src/core/experimental/PostOp.h"
+#include "arm_compute/core/experimental/PostOps.h"
+#include "support/Cast.h"
 #include "tests/validation/reference/ActivationLayer.h"
 #include "tests/validation/reference/ElementwiseOperations.h"
 
diff --git a/utils/TypePrinter.h b/utils/TypePrinter.h
index 9858478..e152cf6 100644
--- a/utils/TypePrinter.h
+++ b/utils/TypePrinter.h
@@ -37,11 +37,12 @@
 #include "arm_compute/core/TensorInfo.h"
 #include "arm_compute/core/Types.h"
 #include "arm_compute/core/experimental/IPostOp.h"
+#include "arm_compute/core/experimental/PostOps.h"
 #include "arm_compute/runtime/CL/CLTunerTypes.h"
 #include "arm_compute/runtime/CL/CLTypes.h"
 #include "arm_compute/runtime/FunctionDescriptors.h"
 #include "arm_compute/runtime/common/LSTMParams.h"
-#include "src/core/experimental/PostOp.h"
+#include "support/Cast.h"
 #include "support/StringSupport.h"
 #include <ostream>
 #include <sstream>