diff --git a/mace/core/net.cc b/mace/core/net.cc
index 8a9c121aa864bd66a21ae6a1dade49466aaa1bd2..ec8afdd14f6a7abf8fbe4bd8d4b0bab4dd5e4e94 100644
--- a/mace/core/net.cc
+++ b/mace/core/net.cc
@@ -48,8 +48,6 @@ SerialNet::SerialNet(
         ProtoArgHelper::GetOptionalArg<OperatorDef, int>(
             operator_def, "device", static_cast<int>(device_type_));
     if (op_device == type) {
-      VLOG(3) << "Creating operator " << operator_def.name() << "("
-              << operator_def.type() << ")";
       OperatorDef temp_def(operator_def);
       std::unique_ptr<OperatorBase> op(
           op_registry->CreateOperator(temp_def, ws, type, mode));
diff --git a/mace/core/operator.cc b/mace/core/operator.cc
index 90013d7f30180f472fae9dba0f4385348ac9aac3..20769fa30bfb5e87eb21fdcbb0c3b98b98365570 100644
--- a/mace/core/operator.cc
+++ b/mace/core/operator.cc
@@ -62,6 +62,8 @@ std::unique_ptr<OperatorBase> OperatorRegistryBase::CreateOperator(
   const int op_mode_i = ProtoArgHelper::GetOptionalArg<OperatorDef, int>(
       operator_def, "mode", static_cast<int>(NetMode::NORMAL));
   const NetMode op_mode = static_cast<NetMode>(op_mode_i);
+  VLOG(3) << "Creating operator " << operator_def.name() << "("
+          << operator_def.type() << "<" << dtype << ">" << ")";
   if (op_mode == mode) {
     return registry_.Create(
         OpKeyBuilder(operator_def.type().data())
diff --git a/mace/kernels/opencl/cl/common.h b/mace/kernels/opencl/cl/common.h
index 8f4aa37fb3f9c6476fc2626e1f89224dbfc943c6..df34fee96c19909397ae96557f4cad3e0b9f9745 100644
--- a/mace/kernels/opencl/cl/common.h
+++ b/mace/kernels/opencl/cl/common.h
@@ -63,7 +63,7 @@ __constant sampler_t SAMPLER =
 
 inline float4 do_sigmoid(float4 in) {
   // native_func not support half
-  return native_recip(1.0 + native_exp(-in));
+  return native_recip(1.0f + native_exp(-in));
 }
 
 inline DATA_TYPE4 do_activation(DATA_TYPE4 in,
diff --git a/mace/python/tools/converter_tool/transformer.py b/mace/python/tools/converter_tool/transformer.py
index ba88217741f3396799d772257413aaaf365d018e..e254f3e47849ce381553ea3e29a1cc476b03eb39 100644
--- a/mace/python/tools/converter_tool/transformer.py
+++ b/mace/python/tools/converter_tool/transformer.py
@@ -104,6 +104,7 @@ class Transformer(base_converter.ConverterInterface):
         self._target_data_format = DataFormat.NHWC
         self._input_output_added = False
         self._opencl_max_image_size = [0, 0]
+        self._output_op_names = set()
         self._quantize_activation_info = {}
         self._quantized_tensor = set()
 
@@ -1388,6 +1389,7 @@ class Transformer(base_converter.ConverterInterface):
 
             ConverterUtil.add_data_type_arg(op_def, mace_pb2.DT_FLOAT)
             ConverterUtil.add_data_format_arg(op_def, DataFormat.NHWC)
+            self._output_op_names.add(op_def.name)
 
         self._input_output_added = True
 
@@ -1525,7 +1527,8 @@ class Transformer(base_converter.ConverterInterface):
                 data_type_arg.name = MaceKeyword.mace_op_data_type_str
                 data_type_arg.i = self._option.data_type
             elif data_type_arg.i != self._option.data_type \
-                    and data_type_arg.i == mace_pb2.DT_FLOAT:
+                    and data_type_arg.i == mace_pb2.DT_FLOAT \
+                    and op.name not in self._output_op_names:
                 data_type_arg.i = self._option.data_type
 
         return False