diff --git a/VERSION b/VERSION
index 3d45b5c..b8061b5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.0.14
+2.0.15
diff --git a/lib/NGT/NGTQ/QuantizedBlobGraph.h b/lib/NGT/NGTQ/QuantizedBlobGraph.h
index 06a9962..0d7e16a 100644
--- a/lib/NGT/NGTQ/QuantizedBlobGraph.h
+++ b/lib/NGT/NGTQ/QuantizedBlobGraph.h
@@ -785,6 +785,11 @@ namespace QBG {
     std::vector<float> &rotatedQuery = searchContainer.objectVector;
     if (objectSpace.getObjectType() == typeid(float)) {
       memcpy(rotatedQuery.data(), searchContainer.object.getPointer(), rotatedQuery.size() * sizeof(float));
+    } else if (objectSpace.getObjectType() == typeid(uint8_t)) {
+      auto *ptr = static_cast<uint8_t*>(searchContainer.object.getPointer());   
+      for (size_t i = 0; i < rotatedQuery.size(); i++) {
+	rotatedQuery[i] = ptr[i];
+      }
 #ifdef NGT_HALF_FLOAT
     } else if (objectSpace.getObjectType() == typeid(NGT::float16)) {
       auto *ptr = static_cast<NGT::float16*>(searchContainer.object.getPointer());   
@@ -893,10 +898,13 @@ namespace QBG {
 	if (objectSpace.getObjectType() == typeid(float)) {
 	  distance = NGT::PrimitiveComparator::L2Float::compare(searchContainer.object.getPointer(), 
 							        neighborptr->second->getPointer(), dimension);
+	} else if (objectSpace.getObjectType() == typeid(uint8_t)) {
+	  distance = NGT::PrimitiveComparator::L2Uint8::compare(searchContainer.object.getPointer(), 
+							        neighborptr->second->getPointer(), dimension);
 #ifdef NGT_HALF_FLOAT
 	} else if (objectSpace.getObjectType() == typeid(NGT::float16)) { 
 	  distance = NGT::PrimitiveComparator::L2Float16::compare(searchContainer.object.getPointer(), 
-							           neighborptr->second->getPointer(), dimension);
+								  neighborptr->second->getPointer(), dimension);
 #endif
 	} else {
 	  assert(false);
@@ -1158,7 +1166,6 @@ namespace QBG {
       }
 
       const string com = "rm -rf " + indexPath + "/" + getWorkspaceName();
-      std::cerr << "pass com=" << com << std::endl;
       if (system(com.c_str()) == -1) {
 	std::cerr << "Warning. cannot remove the workspace directory. " << std::endl;
       }
diff --git a/lib/NGT/NGTQ/Quantizer.h b/lib/NGT/NGTQ/Quantizer.h
index 7c9c8fa..ad09a4e 100644
--- a/lib/NGT/NGTQ/Quantizer.h
+++ b/lib/NGT/NGTQ/Quantizer.h
@@ -658,13 +658,15 @@ class SerializableObject : public NGT::Object {
       dataSize = sizeof(float) * dimension;
 #endif
       break;
+#ifdef NGT_HALF_FLOAT
     case DataTypeFloat16:
 #ifdef NGTQ_QBG
-      dataSize = sizeof(float) * genuineDimension;
+      dataSize = sizeof(NGT::float16) * genuineDimension;
 #else
-      dataSize = sizeof(float) * dimension;
+      dataSize = sizeof(NGT::float16) * dimension;
 #endif
       break;
+#endif
     default:
       NGTThrowException("Quantizer constructor: Inner error. Invalid data type.");
       break;
@@ -2590,11 +2592,21 @@ class QuantizerInstance : public Quantizer {
 	quantizedObjectDistance = new QuantizedObjectDistanceUint8<uint32_t>;
       } else if (property.localIDByteSize == 2) {
 	quantizedObjectDistance = new QuantizedObjectDistanceUint8<uint16_t>;
+#ifdef NGTQ_QBG
+      } else if (property.localIDByteSize == 1) {
+	quantizedObjectDistance = new QuantizedObjectDistanceFloat<uint8_t>;
+#endif
       } else {
+	std::cerr << "Inconsistent localIDByteSize and ObjectType. " << property.localIDByteSize << ":" << globalProperty.objectType << std::endl;
 	abort();
       }
+#ifdef NGTQ_VECTOR_OBJECT
+      generateResidualObject = new GenerateResidualObjectFloat;
+      sizeoftype = sizeof(float);
+#else
       generateResidualObject = new GenerateResidualObjectUint8;
       sizeoftype = sizeof(uint8_t);
+#endif
     } else {
       cerr << "NGTQ::open: Fatal Inner Error: invalid object type. " << globalProperty.objectType << endl;
       cerr << "   check NGT version consistency between the caller and the library." << endl;