diff --git a/mace/core/operator.cc b/mace/core/operator.cc
index 883bc1eb828faaeeda015402d1f9f40059f28d5c..28b3bc4636135aedd8e009396f699847a3f24a9c 100644
--- a/mace/core/operator.cc
+++ b/mace/core/operator.cc
@@ -114,8 +114,7 @@ OpInitContext::OpInitContext(Workspace *ws, Device *device)
     : ws_(ws), device_(device) {}
 
 Operation::Operation(OpConstructContext *context)
-    : operator_def_(context->operator_def())
-{}
+    : operator_def_(context->operator_def()) {}
 
 MaceStatus Operation::Init(OpInitContext *context) {
   Workspace *ws = context->workspace();
@@ -142,7 +141,7 @@ MaceStatus Operation::Init(OpInitContext *context) {
       } else {
         output_type = static_cast<DataType>(
             ProtoArgHelper::GetOptionalArg<OperatorDef, int>(
-            *operator_def_, "T", static_cast<int>(DT_FLOAT)));
+                *operator_def_, "T", static_cast<int>(DT_FLOAT)));
       }
       outputs_.push_back(MACE_CHECK_NOTNULL(ws->CreateTensor(
           output_str, context->device()->allocator(), output_type)));
@@ -316,9 +315,11 @@ std::unique_ptr<Operation> OpRegistryBase::CreateOperation(
   MACE_CHECK(registry_.count(op_type) != 0,
              op_type, " operation is not registered.");
 
+  auto key_dtype =
+      (device_type == DeviceType::GPU && dtype == DT_HALF) ? DT_FLOAT : dtype;
   std::string key = OpKeyBuilder(op_type)
       .Device(device_type)
-      .TypeConstraint("T", dtype == DT_HALF ? DT_FLOAT : dtype)
+      .TypeConstraint("T", key_dtype)
       .Build();
   if (registry_.at(op_type)->creators.count(key) == 0) {
     LOG(FATAL) << "Key not registered: " << key;
@@ -327,7 +328,7 @@ std::unique_ptr<Operation> OpRegistryBase::CreateOperation(
 }
 
 OpConditionBuilder::OpConditionBuilder(const std::string &type)
-  : type_(type) {}
+    : type_(type) {}
 
 const std::string OpConditionBuilder::type() const {
   return type_;
@@ -339,13 +340,13 @@ OpConditionBuilder &OpConditionBuilder::SetDevicePlacerFunc(
   return *this;
 }
 
-OpConditionBuilder& OpConditionBuilder::SetInputMemoryTypeSetter(
+OpConditionBuilder &OpConditionBuilder::SetInputMemoryTypeSetter(
     OpRegistrationInfo::MemoryTypeSetter setter) {
   memory_type_setter_ = setter;
   return *this;
 }
 
-OpConditionBuilder& OpConditionBuilder::SetInputsDataFormatSelector(
+OpConditionBuilder &OpConditionBuilder::SetInputsDataFormatSelector(
     OpRegistrationInfo::DataFormatSelector selector) {
   data_format_selector_ = selector;
   return *this;