CPU Direct Execution: Implement Sign

src/ngraph/runtime/cpu/cpu_builder.cpp

@@ -100,6 +100,7 @@
 #include "ngraph/runtime/cpu/kernel/not_equal.hpp"
 #include "ngraph/runtime/cpu/kernel/relu.hpp"
 #include "ngraph/runtime/cpu/kernel/result.hpp"
+#include "ngraph/runtime/cpu/kernel/sign.hpp"
 #include "ngraph/runtime/cpu/kernel/sqrt.hpp"
 #include "ngraph/runtime/cpu/kernel/subtract.hpp"
 #include "ngraph/runtime/cpu/op/convert_layout.hpp"
@@ -257,6 +258,12 @@ namespace ngraph
                 BUILD_UNARY_ELEMWISE_FUNCTOR(runtime::cpu::kernel::logical_not);
             }
 
+            template <>
+            void Builder::BUILDER_DECL(ngraph::op::Sign)
+            {
+                BUILD_UNARY_ELEMWISE_FUNCTOR(runtime::cpu::kernel::sign);
+            }
+
             template <>
             void Builder::BUILDER_DECL(ngraph::op::Constant)
             {
@@ -304,6 +311,7 @@ namespace ngraph
             REGISTER_OP_BUILDER(Exp);
             REGISTER_OP_BUILDER(Log);
             REGISTER_OP_BUILDER(Sqrt);
+            REGISTER_OP_BUILDER(Sign);
 
             REGISTER_OP_BUILDER(Not);
             REGISTER_OP_BUILDER(Equal);

src/ngraph/runtime/cpu/kernel/sign.hpp

+/*******************************************************************************
+* Copyright 2018 Intel Corporation
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*******************************************************************************/
+
+#pragma once
+
+#define EIGEN_USE_THREADS
+#include <unsupported/Eigen/CXX11/Tensor>
+
+#include "ngraph/runtime/cpu/kernel/eigen_thread_pool.hpp"
+
+namespace ngraph
+{
+    namespace runtime
+    {
+        namespace cpu
+        {
+            namespace kernel
+            {
+                template <typename ElementType>
+                void sign(void* input0, void* output, size_t count)
+                {
+                    Eigen::array<Eigen::Index, 1> out_dims, in_dims;
+
+                    out_dims[0] = in_dims[0] = count;
+
+                    Eigen::TensorMap<Eigen::Tensor<ElementType, 1, Eigen::RowMajor>> out(
+                        static_cast<ElementType*>(output), out_dims);
+                    Eigen::TensorMap<Eigen::Tensor<ElementType, 1, Eigen::RowMajor>> in0(
+                        static_cast<ElementType*>(input0), in_dims);
+
+                    out.device(eigen::global_thread_pool_device) = in0.sign();
+                }
+            }
+        }
+    }
+}