IntelGPU backend: AvgPoolBackprop operation (#1497)

* IntelGPU backend: AvgPoolBackprop operation

* Requested changes done

* Make gen_window_loop() static & initiate win_elems_size through shape_size

src/ngraph/runtime/intelgpu/intelgpu_backend.cpp

@@ -514,6 +514,24 @@ bool runtime::intelgpu::IntelGPUBackend::compile(shared_ptr<Function> func)
                                  avg_pool->get_padding_below(),
                                  mode);
         }
+        else if ("AvgPoolBackprop" == op->description())
+        {
+            arguments_check(op, 1, 1);
+
+            const shared_ptr<op::AvgPoolBackprop> avg_pool_b =
+                static_pointer_cast<op::AvgPoolBackprop>(op);
+
+            do_avg_pool_backprop_operation(topology,
+                                           get_input_name(op, 0),
+                                           get_input_shape(op, 0),
+                                           get_output_name(op),
+                                           get_output_shape(op),
+                                           get_output_type(op),
+                                           avg_pool_b->get_window_shape(),
+                                           avg_pool_b->get_window_movement_strides(),
+                                           avg_pool_b->get_padding_below(),
+                                           avg_pool_b->get_include_padding_in_avg_computation());
+        }
         else if ("Broadcast" == op->description())
         {
             arguments_check(op, 1, 1);

src/ngraph/runtime/intelgpu/intelgpu_op_custom_kernels.hpp

@@ -54,6 +54,17 @@ namespace ngraph
                                                 const Shape& win_stride,
                                                 const Shape& pad_below);
 
+            void do_avg_pool_backprop_operation(cldnn::topology& topology,
+                                                const std::string& delta_name,
+                                                const Shape& delta_shape,
+                                                const std::string& output_name,
+                                                const Shape& output_shape,
+                                                const element::Type& output_type,
+                                                const Shape& win_shape,
+                                                const Shape& win_stride,
+                                                const Shape& pad_below,
+                                                const bool include_padding);
+
             void do_dot_operation(cldnn::topology& topology,
                                   const std::string& inputA_name,
                                   const Shape& inputA_shape,

src/ngraph/runtime/intelgpu/unit_test.manifest

@@ -7,10 +7,7 @@ backwards_abs
 backwards_atan
 backwards_avgpool_n1_c1_hw2x2
 backwards_avgpool_n1_c1_hw4x4
-backwards_avgpool_n2_c2_hw2x2_win_2x2_str_1x1_padding_numeric
 backwards_avgpool_n2_c2_hw4x4
-backwards_avgpool_n2_c2_hw4x4_numeric
-backwards_avgpool_n2_c2_hw4x4_win_2x2_str_1x1_numeric
 backwards_batch_norm_three_outputs
 backwards_ceiling
 backwards_dot_scalar_tensor