IntelGPU backend: Power, Sigmoid and ReluBackprop operations (#1286)

* IntelGPU backend: Power, Sigmoid and ReluBackprop operations

* style changed to ReluBackprop

* Update intelgpu_backend.cpp

src/ngraph/runtime/intelgpu/intelgpu_backend.cpp

@@ -15,6 +15,7 @@
 *******************************************************************************/
 
 #include <CPP/activation.hpp>
+#include <CPP/activation_grad.hpp>
 #include <CPP/batch_norm.hpp>
 #include <CPP/convolution.hpp>
 #include <CPP/data.hpp>
@@ -338,6 +339,19 @@ bool runtime::intelgpu::IntelGPUBackend::compile(shared_ptr<Function> func)
         {
             do_unary_operation(topology, op, activation_relu);
         }
+        else if ("ReluBackprop" == op->description())
+        {
+            arguments_check(op, 2, 1);
+
+            const string& input = op->get_inputs().at(0).get_tensor().get_name();
+            const string& input_grad = op->get_inputs().at(1).get_tensor().get_name();
+            const string& output_name = op->get_outputs().begin()->get_tensor().get_name();
+            const cldnn_activation_additional_params& param = {0.f, 0.f};
+
+            const cldnn::activation_grad cldnn_activ_grad(
+                output_name, input_grad, input, activation_grad_relu, param);
+            topology.add(cldnn_activ_grad);
+        }
         else if ("Abs" == op->description())
         {
             do_unary_operation(topology, op, activation_abs);
@@ -350,10 +364,18 @@ bool runtime::intelgpu::IntelGPUBackend::compile(shared_ptr<Function> func)
         {
             do_unary_operation(topology, op, activation_hyperbolic_tan);
         }
+        else if ("Sigmoid" == op->description())
+        {
+            do_unary_operation(topology, op, activation_logistic);
+        }
         else if ("Subtract" == op->description())
         {
             do_eltwise_operation(topology, op, cldnn::eltwise_mode::sub);
         }
+        else if ("Power" == op->description())
+        {
+            do_eltwise_operation(topology, op, cldnn::eltwise_mode::pow);
+        }
         else if ("Pad" == op->description())
         {
             arguments_check(op, 2, 1);