Merge branch 'master' into cyphers/dochow

CMakeLists.txt

@@ -60,6 +60,8 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 # set directory where the custom finders live
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
 
+include(var_functions)
+
 #-----------------------------------------------------------------------------------------------
 # Installation logic...
 #-----------------------------------------------------------------------------------------------
@@ -97,14 +99,15 @@ endif()
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
-SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -g")
-SET(CMAKE_CXX_FLAGS_RELEASE "-O3")
-SET(CMAKE_CXX_FLAGS_DEBUG  "-O0 -g")
 
-if ("${NGRAPH_WARNINGS_AS_ERRORS}" MATCHES "^ON$")
-    message(STATUS "Enabling warnings as errors")
+ngraph_var(NGRAPH_WARNINGS_AS_ERRORS DEFAULT "OFF")
+if ("${NGRAPH_WARNINGS_AS_ERRORS}" MATCHES "^(ON|TRUE)$")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
+    message(STATUS "Warnings as errors")
 endif()
+SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -g")
+SET(CMAKE_CXX_FLAGS_RELEASE "-O3")
+SET(CMAKE_CXX_FLAGS_DEBUG  "-O0 -g")
 
 # Set true if CPU backend is built by default
 if (NOT DEFINED NGRAPH_CPU_ENABLE)

cmake/Modules/var_functions.cmake

+# ******************************************************************************
+# Copyright 2017-2018 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.
+# ******************************************************************************
+
+# function check existence of cmake and environment variable and read their value
+# If the variable is not defined then the supplied default value used
+# example:
+#    ngraph_var(NGRAPH_VARIABLE_NAME DEFAULT "OFF")
+#        checks if variable NGRAPH_VARIABLE_NAME was passed in via the cmake command line
+#            if found then passed in value is used
+#            else checks for the existence of the environment variable NGRAPH_VARIABLE_NAME
+#                if found it's value is used
+#        if none of the above then the default value is used
+function(NGRAPH_VAR)
+    set(options)
+    set(oneValueArgs DEFAULT)
+    set(multiValueArgs)
+    cmake_parse_arguments(NGRAPH_VAR "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+    if (NOT DEFINED ${NGRAPH_VAR_UNPARSED_ARGUMENTS})
+        set(${NGRAPH_VAR_UNPARSED_ARGUMENTS} ${NGRAPH_VAR_DEFAULT} PARENT_SCOPE)
+        if(DEFINED ENV{${NGRAPH_VAR_UNPARSED_ARGUMENTS}})
+            set(${NGRAPH_VAR_UNPARSED_ARGUMENTS} $ENV{${NGRAPH_VAR_UNPARSED_ARGUMENTS}} PARENT_SCOPE)
+        endif()
+    endif()
+endfunction()

cmake/external_json.cmake

+# ******************************************************************************
+# Copyright 2017-2018 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.
+# ******************************************************************************
+
+# Enable ExternalProject CMake module
+include(ExternalProject)
+
+#------------------------------------------------------------------------------
+# Download json
+#------------------------------------------------------------------------------
+
+SET(JSON_GIT_REPO_URL https://github.com/nlohmann/json)
+SET(JSON_GIT_LABEL v3.1.1)
+
+# The 'BUILD_BYPRODUCTS' argument was introduced in CMake 3.2.
+if (${CMAKE_VERSION} VERSION_LESS 3.2)
+    ExternalProject_Add(
+        ext_json
+        GIT_REPOSITORY ${JSON_GIT_REPO_URL}
+        GIT_TAG ${JSON_GIT_LABEL}
+        # Disable install step
+        BUILD_COMMAND ""
+        INSTALL_COMMAND ""
+        UPDATE_COMMAND ""
+        )
+else()
+    ExternalProject_Add(
+        ext_json
+        GIT_REPOSITORY ${JSON_GIT_REPO_URL}
+        GIT_TAG ${JSON_GIT_LABEL}
+        # Disable install step
+        BUILD_COMMAND ""
+        INSTALL_COMMAND ""
+        UPDATE_COMMAND ""
+        )
+endif()
+
+#------------------------------------------------------------------------------
+
+get_filename_component(
+    JSON_INCLUDE_DIR
+    "${EXTERNAL_PROJECTS_ROOT}/ext_json-prefix/src/ext_json/include"
+    ABSOLUTE)
+set(JSON_INCLUDE_DIR "${JSON_INCLUDE_DIR}" PARENT_SCOPE)

src/ngraph/CMakeLists.txt

@@ -266,8 +266,9 @@ if (NGRAPH_CPU_ENABLE AND LLVM_INCLUDE_DIR AND MKLDNN_INCLUDE_DIR)
         DEPENDS resource_generator ext_eigen ext_llvm ext_mkldnn
         BYPRODUCTS
     )
-    add_dependencies(ngraph header_resource)
+    add_dependencies(ngraph header_resource ext_json)
     include_directories(${CMAKE_BINARY_DIR})
+    include_directories(SYSTEM ${JSON_INCLUDE_DIR})
 endif()
 
 if (NOT APPLE)

src/ngraph/runtime/cpu/cpu_tracing.hpp

@@ -21,8 +21,8 @@
 #include <string>
 #include <vector>
 
-#include "ngraph/json.hpp"
 #include "ngraph/runtime/cpu/cpu_external_function.hpp"
+#include "nlohmann/json.hpp"
 
 namespace ngraph
 {

src/ngraph/serializer.cpp

@@ -90,57 +90,6 @@ static std::shared_ptr<ngraph::Function>
 static json write(const ngraph::Function&);
 static json write(const ngraph::Node&);
 
-// There should be a map from element type names to element types so deserialization can
-// find the singletons and serialization can serialize by name.
-static const element::Type& to_ref(const element::Type& t)
-{
-    if (t == element::boolean)
-    {
-        return element::boolean;
-    }
-    if (t == element::f32)
-    {
-        return element::f32;
-    }
-    if (t == element::f64)
-    {
-        return element::f64;
-    }
-    if (t == element::i8)
-    {
-        return element::i8;
-    }
-    if (t == element::i16)
-    {
-        return element::i16;
-    }
-    if (t == element::i32)
-    {
-        return element::i32;
-    }
-    if (t == element::i64)
-    {
-        return element::i64;
-    }
-    if (t == element::u8)
-    {
-        return element::u8;
-    }
-    if (t == element::u16)
-    {
-        return element::u16;
-    }
-    if (t == element::u32)
-    {
-        return element::u32;
-    }
-    if (t == element::u64)
-    {
-        return element::u64;
-    }
-    throw runtime_error("type not valid");
-}
-
 static json write_element_type(const ngraph::element::Type& n)
 {
     json j;
@@ -148,12 +97,12 @@ static json write_element_type(const ngraph::element::Type& n)
     return j;
 }
 
-static const element::Type& read_element_type(const json& j)
+static element::Type read_element_type(const json& j)
 {
     size_t bitwidth = 0;
-    bool is_real;
-    bool is_signed;
-    string c_type_string;
+    bool is_real = false;
+    bool is_signed = false;
+    string c_type_string = "";
     if (j.is_object())
     {
         bitwidth = j.at("bitwidth").get<size_t>();
@@ -176,26 +125,7 @@ static const element::Type& read_element_type(const json& j)
             }
         }
     }
-    return to_ref(element::Type(bitwidth, is_real, is_signed, c_type_string));
-}
-
-static json write_tensor_type(const element::Type& element_type, const Shape& shape)
-{
-    json j;
-    j["element_type"] = write_element_type(element_type);
-    j["shape"] = shape;
-    return j;
-}
-
-static std::shared_ptr<const TensorViewType>
-    read_tensor_type(const json& j, const string& type, const string& sshape)
-{
-    const element::Type& et = read_element_type(j.at(type));
-    Shape shape =
-        j.count(sshape) > 0
-            ? Shape(j.at(sshape).get<vector<size_t>>())
-            : Shape{} /*HACK, so we could call read_tensor_type uniformly @ each callsite*/;
-    return make_shared<TensorViewType>(et, shape);
+    return element::Type(bitwidth, is_real, is_signed, c_type_string);
 }
 
 string ngraph::serialize(shared_ptr<ngraph::Function> func, size_t indent)
@@ -216,7 +146,7 @@ string ngraph::serialize(shared_ptr<ngraph::Function> func, size_t indent)
     }
     else
     {
-        rc = j.dump(indent);
+        rc = j.dump(static_cast<int>(indent));
     }
     return rc;
 }
@@ -405,14 +335,14 @@ static shared_ptr<ngraph::Function>
         {
             auto type_node_js =
                 node_js.count("element_type") == 0 ? node_js.at("value_type") : node_js;
-            auto& element_type = read_element_type(type_node_js.at("element_type"));
+            auto element_type = read_element_type(type_node_js.at("element_type"));
             auto shape = type_node_js.at("shape");
             auto value = node_js.at("value").get<vector<string>>();
             node = make_shared<op::Constant>(element_type, shape, value);
         }
         else if (node_op == "Convert")
         {
-            auto& target_type = read_element_type(node_js.at("target_type"));
+            auto target_type = read_element_type(node_js.at("target_type"));
             node = make_shared<op::Convert>(args[0], target_type);
         }
         else if (node_op == "Convolution")
@@ -662,7 +592,7 @@ static shared_ptr<ngraph::Function>
         {
             auto type_node_js =
                 node_js.count("element_type") == 0 ? node_js.at("value_type") : node_js;
-            auto& element_type = read_element_type(type_node_js.at("element_type"));
+            auto element_type = read_element_type(type_node_js.at("element_type"));
             auto shape = type_node_js.at("shape");
             node = make_shared<op::Parameter>(element_type, shape);
         }

src/ngraph/serializer.hpp

@@ -20,8 +20,8 @@
 #include <unordered_map>
 
 #include "ngraph/function.hpp"
-#include "ngraph/json.hpp"
 #include "ngraph/node.hpp"
+#include "nlohmann/json.hpp"
 
 namespace ngraph
 {

src/resource/CMakeLists.txt

@@ -37,7 +37,5 @@ if (NGRAPH_CPU_ENABLE)
         set(HEADER_SEARCH_DEFINES ${HEADER_SEARCH_DEFINES} "NGRAPH_TBB_ENABLE")
     endif()
 
-    message("HEADER_SEARCH_DEFINES ${HEADER_SEARCH_DEFINES}")
-
     set_source_files_properties(main.cpp PROPERTIES COMPILE_DEFINITIONS "${HEADER_SEARCH_DEFINES}")
 endif()

src/tools/CMakeLists.txt

@@ -26,13 +26,14 @@ if (NGRAPH_CPU_ENABLE)
 
     add_executable(nbench ${SRC})
     add_dependencies(nbench ngraph)
-    
+
     set(HEADER_SEARCH_DEFINES
         "NGRAPH_HEADERS_PATH=\"${NGRAPH_INCLUDE_PATH}\""
     )
-    
+
     target_link_libraries(nbench ngraph)
-    
+    include_directories(SYSTEM ${JSON_INCLUDE_DIR})
+
     set_source_files_properties(nbench.cpp PROPERTIES COMPILE_DEFINITIONS "${HEADER_SEARCH_DEFINES}")
 
 endif()

test/CMakeLists.txt

@@ -178,7 +178,8 @@ endif()
 target_link_libraries(unit-test ngraph libgtest pthread)
 target_link_libraries(unit-test ${CMAKE_DL_LIBS})
 
-add_dependencies(unit-test ngraph libgtest ext_eigen)
+add_dependencies(unit-test ngraph libgtest ext_eigen ext_json)
+include_directories(SYSTEM ${JSON_INCLUDE_DIR})
 
 add_custom_target(style-check
         COMMAND ${PROJECT_SOURCE_DIR}/maint/check-code-format.sh

test/argon_fusion.cpp

@@ -24,7 +24,6 @@
 
 #include "ngraph/file_util.hpp"
 #include "ngraph/graph_util.hpp"
-#include "ngraph/json.hpp"
 #include "ngraph/log.hpp"
 #include "ngraph/ngraph.hpp"
 #include "ngraph/ops/relu.hpp"
@@ -37,6 +36,7 @@
 #include "ngraph/runtime/argon/pass/argon_fusion.hpp"
 #include "ngraph/serializer.hpp"
 #include "ngraph/util.hpp"
+#include "nlohmann/json.hpp"
 #include "util/matcher.hpp"
 #include "util/test_tools.hpp"
 

test/backend_test.in.cpp

@@ -3055,7 +3055,7 @@ TEST(${BACKEND_NAME}, scalar_constant_float32)
     auto result = backend->make_primary_tensor_view(element::f32, Shape{});
 
     cf->call({}, {result});
-    EXPECT_EQ(vector<float>{4.8}, read_vector<float>(result));
+    EXPECT_EQ(vector<float>{4.8f}, read_vector<float>(result));
 }
 
 TEST(${BACKEND_NAME}, scalar_constant_int64)
@@ -3073,7 +3073,7 @@ TEST(${BACKEND_NAME}, scalar_constant_int64)
     auto result = backend->make_primary_tensor_view(element::i64, Shape{});
 
     cf->call({}, {result});
-    EXPECT_EQ(vector<int64_t>{{2112}}, read_vector<int64_t>(result));
+    EXPECT_EQ(vector<int64_t>{2112}, read_vector<int64_t>(result));
 }
 
 TEST(${BACKEND_NAME}, tensor_constant_float32)
@@ -3092,7 +3092,7 @@ TEST(${BACKEND_NAME}, tensor_constant_float32)
     auto result = backend->make_primary_tensor_view(element::f32, shape);
 
     cf->call({}, {result});
-    EXPECT_EQ((vector<float>{4.8, 4.7, -5.3, 0}), read_vector<float>(result));
+    EXPECT_EQ((vector<float>{4.8f, 4.7f, -5.3f, 0.0f}), read_vector<float>(result));
 }
 
 TEST(${BACKEND_NAME}, tensor_constant_int64)
@@ -3514,11 +3514,11 @@ TEST(${BACKEND_NAME}, sum_to_scalar_stable)
 
     // Create some tensors for input/output
     auto a = backend->make_primary_tensor_view(element::f32, shape);
-    copy_data(a, vector<float>{1e-6, -1, 0, 1});
+    copy_data(a, vector<float>{1e-6f, -1, 0, 1});
     auto result = backend->make_primary_tensor_view(element::f32, Shape{});
 
     cf->call({a}, {result});
-    EXPECT_TRUE(test::all_close(read_vector<float>(result), vector<float>{1e-6}, 5e-2f));
+    EXPECT_TRUE(test::all_close(read_vector<float>(result), vector<float>{1e-6f}, 5e-2f));
     // EXPECT_EQ(vector<float>{1e-6}, read_vector<float>(result));
 }
 
@@ -3539,13 +3539,13 @@ TEST(${BACKEND_NAME}, sum_3d_to_vector_stable)
 
     // Create some tensors for input/output
     auto a = backend->make_primary_tensor_view(element::f32, shape_a);
-    copy_data(a, vector<float>{1, 1,  1,  1,  1,  1,  1e-4, 1e-5, 1e-6, 1,  1,  1,  1, 1,
-                               1, -1, -1, -1, -1, -1, -1,   -1,   -1,   -1, -1, -1, -1});
+    copy_data(a, vector<float>{1, 1,  1,  1,  1,  1,  1e-4f, 1e-5f, 1e-6f, 1,  1,  1,  1, 1,
+                               1, -1, -1, -1, -1, -1, -1,    -1,    -1,    -1, -1, -1, -1});
     auto result = backend->make_primary_tensor_view(element::f32, shape_rt);
 
     cf->call({a}, {result});
     EXPECT_TRUE(
-        test::all_close(read_vector<float>(result), vector<float>{1e-4, 1e-5, 1e-6}, 5e-2f));
+        test::all_close(read_vector<float>(result), vector<float>{1e-4f, 1e-5f, 1e-6f}, 5e-2f));
 }
 
 TEST(${BACKEND_NAME}, sign)
@@ -3562,7 +3562,7 @@ TEST(${BACKEND_NAME}, sign)
 
     // Create some tensors for input/output
     auto a = backend->make_primary_tensor_view(element::f32, shape);
-    copy_data(a, vector<float>{1, -2, 0, -4.8f, 4.8f, -0.0});
+    copy_data(a, vector<float>{1, -2, 0, -4.8f, 4.8f, -0.0f});
     auto result = backend->make_primary_tensor_view(element::f32, shape);
 
     cf->call({a}, {result});

test/core_fusion.cpp

@@ -24,7 +24,6 @@
 
 #include "ngraph/file_util.hpp"
 #include "ngraph/graph_util.hpp"
-#include "ngraph/json.hpp"
 #include "ngraph/log.hpp"
 #include "ngraph/ngraph.hpp"
 #include "ngraph/ops/relu.hpp"
@@ -36,6 +35,7 @@
 #include "ngraph/pattern/op/label.hpp"
 #include "ngraph/serializer.hpp"
 #include "ngraph/util.hpp"
+#include "nlohmann/json.hpp"
 #include "util/matcher.hpp"
 #include "util/test_tools.hpp"
 

test/cpu_fusion.cpp

@@ -33,13 +33,13 @@
 #include "ngraph/pattern/op/label.hpp"
 //
 #include "ngraph/file_util.hpp"
-#include "ngraph/json.hpp"
 #include "ngraph/pass/reshape_elimination.hpp"
 #include "ngraph/pass/visualize_tree.hpp"
 #include "ngraph/runtime/cpu/ops/matmul_bias.hpp"
 #include "ngraph/runtime/cpu/pass/cpu_fusion.hpp"
 #include "ngraph/serializer.hpp"
 #include "ngraph/util.hpp"
+#include "nlohmann/json.hpp"
 #include "util/all_close.hpp"
 #include "util/matcher.hpp"
 #include "util/test_tools.hpp"
@@ -201,26 +201,26 @@ TEST(cpu_fusion, batchnorm_fprop_b1c2h2w2)
                             0.54488319f,
                             0.42365479f,
                             0.64589411f,
-                            0.4375872,
-                            0.89177299});
+                            0.4375872f,
+                            0.89177299f});
     auto _mean = backend->make_primary_tensor_view(element::f32, mean_shape);
-    copy_data(_mean, vector<float>{0.60291237, 0.59972727});
+    copy_data(_mean, vector<float>{0.60291237f, 0.59972727f});
     auto _var = backend->make_primary_tensor_view(element::f32, var_shape);
-    copy_data(_var, vector<float>{0.00472505, 0.03617825});
+    copy_data(_var, vector<float>{0.00472505f, 0.03617825f});
     auto _gamma = backend->make_primary_tensor_view(element::f32, gamma_shape);
     copy_data(_gamma, vector<float>{1.0f, 1.0f});
     auto _beta = backend->make_primary_tensor_view(element::f32, beta_shape);
     copy_data(_beta, vector<float>{0.0f, 0.0f});
     auto result = backend->make_primary_tensor_view(element::f32, shape_r);
 
-    vector<float> expected_result{-0.71498716,
-                                  1.48388731,
-                                  -0.00196938,
-                                  -0.76693159,
-                                  -0.91316032,
-                                  0.23943391,
-                                  -0.84090298,
-                                  1.51462936};
+    vector<float> expected_result{-0.71498716f,
+                                  1.48388731f,
+                                  -0.00196938f,
+                                  -0.76693159f,
+                                  -0.91316032f,
+                                  0.23943391f,
+                                  -0.84090298f,
+                                  1.51462936f};
     cf->call({_mean, _var, _input, _gamma, _beta}, {result});
     EXPECT_TRUE(test::all_close(expected_result, read_vector<float>(result)));
 }
@@ -255,12 +255,12 @@ TEST(cpu_fusion, batchnorm_fprop_b2c2h2w1)
                             0.54488319f,
                             0.42365479f,
                             0.64589411f,
-                            0.4375872,
-                            0.89177299});
+                            0.4375872f,
+                            0.89177299f});
     auto _mean = backend->make_primary_tensor_view(element::f32, mean_shape);
-    copy_data(_mean, vector<float>{0.60291237, 0.59972727});
+    copy_data(_mean, vector<float>{0.60291237f, 0.59972727f});
     auto _var = backend->make_primary_tensor_view(element::f32, var_shape);
-    copy_data(_var, vector<float>{0.00472505, 0.03617825});
+    copy_data(_var, vector<float>{0.00472505f, 0.03617825f});
     auto _gamma = backend->make_primary_tensor_view(element::f32, gamma_shape);
     copy_data(_gamma, vector<float>{1.0f, 1.0f});
     auto _beta = backend->make_primary_tensor_view(element::f32, beta_shape);
@@ -268,7 +268,7 @@ TEST(cpu_fusion, batchnorm_fprop_b2c2h2w1)
     auto result = backend->make_primary_tensor_view(element::f32, shape_r);
 
     vector<float> expected_result{
-        -0.714987, 1.48389, 0.015746, -0.284436, -2.36912, 0.56806, -0.840903, 1.51463};
+        -0.714987f, 1.48389f, 0.015746f, -0.284436f, -2.36912f, 0.56806f, -0.840903f, 1.51463f};
     cf->call({_mean, _var, _input, _gamma, _beta}, {result});
     EXPECT_TRUE(test::all_close(expected_result, read_vector<float>(result)));
 }

test/reshape_elimination.cpp

@@ -23,7 +23,6 @@
 #include "gtest/gtest.h"
 #include "ngraph/file_util.hpp"
 #include "ngraph/graph_util.hpp"
-#include "ngraph/json.hpp"
 #include "ngraph/log.hpp"
 #include "ngraph/ngraph.hpp"
 #include "ngraph/ops/sum.hpp"
@@ -35,6 +34,7 @@
 #include "ngraph/pattern/op/label.hpp"
 #include "ngraph/serializer.hpp"
 #include "ngraph/util.hpp"
+#include "nlohmann/json.hpp"
 #include "util/matcher.hpp"
 #include "util/test_tools.hpp"
 

test/serialize.cpp

@@ -20,10 +20,10 @@
 #include "gtest/gtest.h"
 
 #include "ngraph/file_util.hpp"
-#include "ngraph/json.hpp"
 #include "ngraph/ngraph.hpp"
 #include "ngraph/serializer.hpp"
 #include "ngraph/util.hpp"
+#include "nlohmann/json.hpp"
 #include "util/test_tools.hpp"
 
 using namespace std;
@@ -60,8 +60,8 @@ TEST(serialize, main)
     string js = serialize(h, 4);
 
     {
-        ofstream f("serialize_function.js");
-        f << js;
+        ofstream out("serialize_function.js");
+        out << js;
     }
 
     istringstream in(js);

test/util/all_close.hpp

@@ -36,8 +36,8 @@ namespace ngraph
         template <typename T>
         bool all_close(const std::vector<T>& a,
                        const std::vector<T>& b,
-                       T rtol = 1e-5f,
-                       T atol = 1e-8f)
+                       T rtol = static_cast<T>(1e-5),
+                       T atol = static_cast<T>(1e-8))
         {
             assert(a.size() == b.size());
             for (size_t i = 0; i < a.size(); ++i)

third-party/CMakeLists.txt

@@ -19,6 +19,7 @@ if(NOT DEFINED EXTERNAL_PROJECTS_ROOT)
 endif()
 
 include( ../cmake/external_gtest.cmake )
+include( ../cmake/external_json.cmake )
 include( ../cmake/external_eigen.cmake )
 include( ../cmake/external_mkldnn.cmake )
 if (NGRAPH_USE_PREBUILT_LLVM OR DEFINED LLVM_TARBALL_URL)