diff --git a/src/tosa_serialization_handler.cpp b/src/tosa_serialization_handler.cpp
index d84e0ab..d782213 100644
--- a/src/tosa_serialization_handler.cpp
+++ b/src/tosa_serialization_handler.cpp
@@ -446,16 +446,6 @@
     auto fb_tosa_version = fb_tosa_graph->version();
     auto fb_tosa_regions = fb_tosa_graph->regions();
 
-    std::vector<std::string> operator_inputs_container;
-    std::vector<std::string> operator_outputs_container;
-
-    std::vector<TosaSerializationBasicBlock*> region_blocks_container;
-
-    std::vector<TosaSerializationOperator*> block_operators_container;
-    std::vector<TosaSerializationTensor*> block_tensors_container;
-    std::vector<std::string> block_inputs_container;
-    std::vector<std::string> block_outputs_container;
-
     TosaAttributeBase* typed_attribute      = NULL;
     TosaSerializationOperator* new_operator = NULL;
     TosaSerializationBasicBlock* new_block  = NULL;
@@ -489,17 +479,21 @@
         auto region_name    = curr_region->name()->str();
         auto fb_tosa_blocks = curr_region->blocks();
 
-        new_region = new TosaSerializationRegion(curr_region->name()->str(), region_blocks_container);
+        new_region = new TosaSerializationRegion(curr_region->name()->str(), {});
         this->GetRegions().push_back(new_region);
 
         for (size_t i = 0; i < fb_tosa_blocks->size(); i++)
         {
+            std::vector<TosaSerializationOperator*> block_operators_container;
+            std::vector<TosaSerializationTensor*> block_tensors_container;
+            std::vector<std::string> block_inputs_container;
+            std::vector<std::string> block_outputs_container;
+
             auto curr_block = fb_tosa_blocks->Get(i);
 
             auto block_name = curr_block->name()->str();
 
             auto fb_tosa_operators = curr_block->operators();
-            block_operators_container.clear();
             for (size_t j = 0; j < fb_tosa_operators->size(); j++)
             {
                 auto curr_operator = fb_tosa_operators->Get(j);
@@ -508,9 +502,11 @@
                 auto attribute_type = curr_operator->attribute_type();
                 auto attribute      = curr_operator->attribute();
 
+                std::vector<std::string> operator_inputs_container;
+                std::vector<std::string> operator_outputs_container;
+
                 // input tensors
                 auto operator_inputs = curr_operator->inputs();
-                operator_inputs_container.clear();
                 if (operator_inputs)
                 {
                     for (size_t k = 0; k < operator_inputs->size(); k++)
@@ -522,7 +518,6 @@
 
                 // output tensors
                 auto operator_outputs = curr_operator->outputs();
-                operator_outputs_container.clear();
                 if (operator_outputs)
                 {
                     for (size_t k = 0; k < operator_outputs->size(); k++)
@@ -567,9 +562,6 @@
             auto block_inputs  = curr_block->inputs();
             auto block_outputs = curr_block->outputs();
 
-            block_inputs_container.clear();
-            block_outputs_container.clear();
-
             for (size_t j = 0; j < block_inputs->size(); j++)
             {
                 auto curr_block_input = block_inputs->Get(j);
@@ -582,7 +574,6 @@
             }
 
             auto fb_tosa_tensors = curr_block->tensors();
-            block_tensors_container.clear();
             for (size_t j = 0; j < fb_tosa_tensors->size(); j++)
             {
                 auto curr_tensor = fb_tosa_tensors->Get(j);
@@ -607,7 +598,7 @@
                                                         block_outputs_container);
             if (new_block)
             {
-                this->GetRegions()[0]->GetBlocks().push_back(new_block);
+                new_region->GetBlocks().push_back(new_block);
             }
             else
             {
@@ -637,26 +628,16 @@
     // regions
     std::vector<flatbuffers::Offset<TosaRegion>> fboffset_regions;
 
-    // blocks
-    std::vector<flatbuffers::Offset<TosaBasicBlock>> fboffset_blocks;
-    std::vector<flatbuffers::Offset<TosaOperator>> fboffset_block_operators;
-    std::vector<flatbuffers::Offset<TosaTensor>> fboffset_block_tensors;
-    std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_block_inputs;
-    std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_block_outputs;
-
-    // operators
-    std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_operator_inputs;
-    std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_operator_outputs;
-
     // translate TosaFlatbufferOperator to flatbuffers::Offset<TosaOperator>
     for (auto region : GetRegions())
     {
+        std::vector<flatbuffers::Offset<TosaBasicBlock>> fboffset_blocks;
         for (auto block : region->GetBlocks())
         {
-            fboffset_block_operators.clear();
-            fboffset_block_tensors.clear();
-            fboffset_block_inputs.clear();
-            fboffset_block_outputs.clear();
+            std::vector<flatbuffers::Offset<TosaOperator>> fboffset_block_operators;
+            std::vector<flatbuffers::Offset<TosaTensor>> fboffset_block_tensors;
+            std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_block_inputs;
+            std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_block_outputs;
             auto block_name = _builder.CreateString(block->GetName().c_str());
             for (auto tensor_str : block->GetInputs())
             {
@@ -672,8 +653,8 @@
             auto fb_block_outputs = _builder.CreateVector(fboffset_block_outputs);
             for (auto op : block->GetOperators())
             {
-                fboffset_operator_inputs.clear();
-                fboffset_operator_outputs.clear();
+                std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_operator_inputs;
+                std::vector<flatbuffers::Offset<flatbuffers::String>> fboffset_operator_outputs;
                 auto operator_op    = op->GetOp();
                 auto attribute_type = op->GetAttributeType();
                 for (auto tensor_str : op->GetInputTensorNames())