Use PROTO_LITE when refactoring Paddle

It will significantly reduce binary size. It is useful for mobile
deployment.

paddle/framework/framework.proto

@@ -13,6 +13,7 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 syntax = "proto2";
+option optimize_for = LITE_RUNTIME;
 package paddle.framework;
 
 enum AttrType {

paddle/framework/op_desc.h

@@ -52,8 +52,6 @@ class OpDescBind {
   void SetOutput(const std::string &param_name,
                  const std::vector<std::string> &args);
 
-  std::string DebugString() { return this->Proto()->DebugString(); }
-
   bool HasAttr(const std::string &name) const {
     return attrs_.find(name) != attrs_.end();
   }

paddle/framework/program_desc.h

@@ -31,8 +31,6 @@ class ProgramDescBind {
 
   BlockDescBind *Block(size_t idx) { return blocks_[idx].get(); }
 
-  std::string DebugString() { return Proto()->DebugString(); }
-
   size_t Size() const { return blocks_.size(); }
 
   ProgramDesc *Proto();

paddle/operators/net_op.h

@@ -14,6 +14,7 @@ limitations under the License. */
 
 #pragma once
 
+#include <set>
 #include "paddle/framework/framework.pb.h"
 #include "paddle/framework/op_registry.h"
 

paddle/pybind/protobuf.cc

@@ -117,7 +117,6 @@ void BindProgramDesc(py::module &m) {
       .def("append_block", &ProgramDescBind::AppendBlock,
            py::return_value_policy::reference)
       .def("block", &ProgramDescBind::Block, py::return_value_policy::reference)
-      .def("__str__", &ProgramDescBind::DebugString)
       .def("num_blocks", &ProgramDescBind::Size);
 }
 
@@ -191,8 +190,6 @@ void BindOpDesc(py::module &m) {
       .def("output", &OpDescBind::Output)
       .def("output_names", &OpDescBind::OutputNames)
       .def("set_output", &OpDescBind::SetOutput)
-      .def("__str__", &OpDescBind::DebugString)
-      .def("__repr__", &OpDescBind::DebugString)
       .def("has_attr", &OpDescBind::HasAttr)
       .def("attr_type", &OpDescBind::GetAttrType)
       .def("attr_names", &OpDescBind::AttrNames)