Merge branch 'yanchen/rm-asserts'

Signed-off-by: Yang Chen <yanchen@microsoft.com>

Source/CNTKv2LibraryDll/proto/onnx/CNTKToONNX.cpp

@@ -2293,7 +2293,6 @@ 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)