Support for PReLU with both one dim and multiple dims slope for fixin…

…g issue on gpufunctests (openvinotoolkit#74)

* [GPU] Support for PReLU with multiple dims slope tensor for GPU (openvinotoolkit#11782)

* reshape a slope tensor of channel-wise prelu

* changed to follow prelu spec

* added unittests for prelu with multiple dims slope

* Update constant.cpp

Blanks are added.

* added comments about PReLU slope reshape policy

* added int8 prelu fusion tests

* Update PReLU slope reshape policy for 1-dims

Signed-off-by: Andrew Park <[email protected]>

Co-authored-by: Eddy Kim <[email protected]>

src/plugins/intel_gpu/src/plugin/ops/constant.cpp

@@ -117,9 +117,9 @@ static void CreateConstantOp(Program& p, const std::shared_ptr<ngraph::op::v0::C
         } else if (ngraph::is_type<ngraph::op::v0::PRelu>(outOp) && node.get_index() == 1) {
             // PReLU slope tensor reshape policy
             //
-            // 1. 1-dim slope is handled by 'getConstTensor'.
-            //   ex) [1] --> [1, 1, 1, 1]
-            //       [N] --> [1, N, 1, 1]
+            // 1. 1-dim slope is handled by replacing the output shape of constant with the input shape of PReLU.
+            //   ex) [1] --> [1, 1]
+            //       [N] --> [1, N]
             //
             // 2. Multi-dims slope tensor is handled by the numpy broadcasting rule that is defined at
             //    'https://docs.openvino.ai/latest/openvino_docs_ops_broadcast_rules.html'.