remove an assert that seems to be too conservative

Author: yangchen-MS

Source/CNTKv2LibraryDll/proto/onnx/CNTKToONNX.cpp

@@ -2266,7 +2266,6 @@ void CNTKToONNXHelper::UpdateONNXType(CNTK::DataType dataType, onnx::TypeProto &
 std::string CNTKToONNXHelper::ToOPName(const FunctionPtr& src)
 {
     auto lookup = Operators::CntkToONNXLookup();
-    assert(lookup.count(src->OpName()) != 0);
 
     std::string opName = ToLegacyString(ToUTF8(src->OpName()));
     if (lookup.count(src->OpName()) == 1)
@@ -9147,4 +9146,4 @@ std::unordered_map<std::string, std::string> CNTKToONNXHelper::UniqueNodeNameSto
 std::unordered_set<std::string> CNTKToONNXHelper::UniqueNodeNameStorage::nodeNameSet;
 std::unordered_map<Variable, Variable> CNTKToONNXHelper::UniqueNodeNameStorage::compositeOutputsMap;
 std::unordered_map<Variable, Variable> CNTKToONNXHelper::compositeOutputsMap;
-std::unordered_set<CNTKToONNXHelper::PostProcessFlag, CNTKToONNXHelper::PostProcessFlagHash> CNTKToONNXHelper::postProcessFlags;
+std::unordered_set<CNTKToONNXHelper::PostProcessFlag, CNTKToONNXHelper::PostProcessFlagHash> CNTKToONNXHelper::postProcessFlags;