Serializer Pass (#1050)

* serializer pass

src/ngraph/CMakeLists.txt

@@ -125,6 +125,7 @@ set (SRC
     pass/validate_graph.cpp
     pass/visualize_tree.cpp
     pass/core_fusion.cpp
+    pass/serialize.cpp
     pass/zero_dim_tensor_elimination.cpp
     pattern/matcher.cpp
     runtime/aligned_buffer.cpp

src/ngraph/pass/manager.cpp

@@ -25,6 +25,7 @@
 #include "ngraph/op/reduce.hpp"
 #include "ngraph/pass/manager.hpp"
 #include "ngraph/pass/pass.hpp"
+#include "ngraph/pass/serialize.hpp"
 #include "ngraph/pass/visualize_tree.hpp"
 
 using namespace std;
@@ -37,6 +38,11 @@ ngraph::pass::Manager::Manager()
     {
         m_visualize = true;
     }
+    static const auto nest = std::getenv("NGRAPH_ENABLE_SERIALIZE_TRACING");
+    if (nest)
+    {
+        m_serialize = true;
+    }
 }
 
 ngraph::pass::Manager::~Manager()
@@ -93,17 +99,27 @@ void ngraph::pass::Manager::run_passes(shared_ptr<Function> func)
             }
         }
 
-        if (m_visualize)
+        if (m_visualize || m_serialize)
         {
-            //visualizations will be named after the outermost function
+            //visualizations and serializations will be named after the outermost function
             const size_t num_digits_in_pass_index = 3;
             std::string index_str = std::to_string(index);
             index_str = std::string(num_digits_in_pass_index - index_str.length(), '0') + index_str;
-            auto fname = fs.at(0)->get_name() + std::string("_") + index_str + std::string("_") +
-                         m_pass_names.at(index) + std::string(".") +
-                         pass::VisualizeTree::get_file_ext();
-            pass::VisualizeTree vt(fname);
-            vt.run_on_module(fs);
+            auto base_filename = fs.at(0)->get_name() + std::string("_") + index_str +
+                                 std::string("_") + m_pass_names.at(index) + std::string(".");
+
+            if (m_visualize)
+            {
+                pass::VisualizeTree vt(base_filename + pass::VisualizeTree::get_file_ext());
+                vt.run_on_module(fs);
+            }
+
+            if (m_serialize)
+            {
+                //no "." in the extension
+                pass::Serialization st(base_filename + "json");
+                st.run_on_module(fs);
+            }
         }
         index++;
     }

src/ngraph/pass/manager.hpp

@@ -48,7 +48,7 @@ public:
         auto pass = std::make_shared<T>(args...);
         auto pass_base = std::static_pointer_cast<PassBase>(pass);
         m_pass_list.push_back(pass_base);
-        if (m_visualize)
+        if (m_visualize || m_serialize)
         {
             m_pass_names.push_back(typeid(T).name());
         }
@@ -58,9 +58,11 @@ public:
 
     ManagerState& get_state();
     void set_pass_visualization(bool new_state) { m_visualize = new_state; }
+    void set_pass_serialization(bool new_state) { m_serialize = new_state; }
 private:
     std::vector<std::string> m_pass_names;
     std::vector<std::shared_ptr<PassBase>> m_pass_list;
     ManagerState m_state;
     bool m_visualize = false;
+    bool m_serialize = false;
 };

src/ngraph/pass/serialize.cpp

+/*******************************************************************************
+* 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.
+*******************************************************************************/
+
+#include <fstream>
+
+#include "ngraph/file_util.hpp"
+#include "ngraph/pass/serialize.hpp"
+#include "ngraph/serializer.hpp"
+#include "ngraph/util.hpp"
+#include "nlohmann/json.hpp"
+
+using namespace std;
+using namespace ngraph;
+
+pass::Serialization::Serialization(const string& name)
+    : m_name{name}
+{
+}
+
+bool pass::Serialization::run_on_module(vector<shared_ptr<Function>>& functions)
+{
+    //serializing the outermost functions
+    //also implicitly serializes any inner functions
+    serialize(m_name, functions.at(0), 4);
+    return false;
+}

src/ngraph/pass/serialize.hpp

+/*******************************************************************************
+* 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.
+*******************************************************************************/
+
+#pragma once
+
+#include <string>
+
+#include "ngraph/pass/pass.hpp"
+
+namespace ngraph
+{
+    namespace pass
+    {
+        class Serialization;
+    }
+}
+
+class ngraph::pass::Serialization : public ModulePass
+{
+public:
+    Serialization(const std::string& name);
+
+    virtual bool run_on_module(std::vector<std::shared_ptr<ngraph::Function>>&) override;
+
+private:
+    const std::string m_name;
+};