diff --git a/oneflow/core/graph/chain_graph.cpp b/oneflow/core/graph/chain_graph.cpp
index a04b03571f8763f0c46dc9436023570d1f88fe83..c89f07958da7bd8584b53cb87ff382743cc6f1b5 100644
--- a/oneflow/core/graph/chain_graph.cpp
+++ b/oneflow/core/graph/chain_graph.cpp
@@ -350,7 +350,7 @@ void ChainGraph::BuildLossPrintStruct() {
 
 std::shared_ptr<const Operator> ConstructModelUpdateOp() {
   OperatorConf mdupdt_conf;
-  mdupdt_conf.set_name("model_update_" + NewUniqueId());
+  mdupdt_conf.set_name("md_update_" + NewUniqueId());
   const JobDesc* job_desc = JobDesc::Singleton();
   if (job_desc->IsTrain()) {
     const TrainConf& train_conf = job_desc->job_conf().train_conf();
diff --git a/oneflow/core/graph/task_node.cpp b/oneflow/core/graph/task_node.cpp
index d2f6089e64f5ffeb36f5446e27fe1a95a086d81a..e5023cbd37c40c842d6d246d3f0a88c783e31172 100644
--- a/oneflow/core/graph/task_node.cpp
+++ b/oneflow/core/graph/task_node.cpp
@@ -83,7 +83,9 @@ void TaskNode::ToProto(TaskProto* task_proto) {
   }
   auto consumed_regst_proto = task_proto->mutable_consumed_regst_desc_id();
   for (auto& pair : consumed_regsts_) {
-    int64_t regst_desc_id = pair.second.lock()->regst_desc_id();
+    std::shared_ptr<RegstDesc> regst = pair.second.lock();
+    if (!regst) { continue; }
+    int64_t regst_desc_id = regst->regst_desc_id();
     CHECK(consumed_regst_proto->insert({pair.first, regst_desc_id}).second);
   }
 }
diff --git a/oneflow/core/operator/op_conf.proto b/oneflow/core/operator/op_conf.proto
index 42fadc3ca0fa22a42e840e11ac5ebf4e7bbff202..e0be193216b7749814eb3ba8e3e1a007d74a0bff 100644
--- a/oneflow/core/operator/op_conf.proto
+++ b/oneflow/core/operator/op_conf.proto
@@ -43,8 +43,8 @@ message ConvolutionOpConf {
   optional int32 dilation_h = 11 [default = 1];
   optional int32 dilation_w = 12 [default = 1];
 
-  optional FillConf weight_fill = 14;
-  optional FillConf bias_fill = 15;
+  optional FillConf weight_fill = 13;
+  optional FillConf bias_fill = 14;
 }
 
 message InnerProductOpConf {
@@ -94,8 +94,8 @@ message SoftmaxOpConf {
 
 message SoftmaxLossOpConf {
   required string prediction = 1;
-  required string label = 3;
-  required string loss = 4;
+  required string label = 2;
+  required string loss = 3;
 }
 
 message MultinomialLogisticLossOpConf {
@@ -107,7 +107,7 @@ message MultinomialLogisticLossOpConf {
 message ConcatOpConf {
   repeated string in = 1;
   required string out = 2;
-  required int32 axis = 4;
+  required int32 axis = 3;
 }
 
 message CopyCommNetOpConf {
@@ -142,17 +142,17 @@ message BoxCloneConf {
 }
 
 message BoxingOpConf {
-  required string lbn = 2;
-  required int32 in_num = 3;
-  required int32 out_num = 4;
+  required string lbn = 1;
+  required int32 in_num = 2;
+  required int32 out_num = 3;
 
   oneof in_box {
-    BoxConcatConf concat_box = 5;
-    BoxAddConf add_box = 6;
+    BoxConcatConf concat_box = 4;
+    BoxAddConf add_box = 5;
   }
   oneof out_box {
-    BoxSplitConf split_box = 7;
-    BoxCloneConf clone_box = 8;
+    BoxSplitConf split_box = 6;
+    BoxCloneConf clone_box = 7;
   }
 }
 
diff --git a/oneflow/core/operator/operator.cpp b/oneflow/core/operator/operator.cpp
index c6013e3f8afe126e922a5bb3854d65aea4258bad..a9429f7d0d71d97f9ce9b722cebd7b657fee89a2 100644
--- a/oneflow/core/operator/operator.cpp
+++ b/oneflow/core/operator/operator.cpp
@@ -2,6 +2,20 @@
 
 namespace oneflow {
 
+namespace {
+
+DataType GetDataTypeFromBnInOpVec(
+    std::function<const BlobDesc*(const std::string&)> GetBlobDesc4BnInOp,
+    const std::vector<std::string>& bn_in_ops) {
+  for (const std::string& bn_in_op : bn_in_ops) {
+    const BlobDesc* blob_desc = GetBlobDesc4BnInOp(bn_in_op);
+    if (blob_desc) { return blob_desc->data_type(); }
+  }
+  return DataType::kInvalidDataType;
+}
+
+}  // namespace
+
 void Operator::InitFromOpConf(const OperatorConf& op_conf) {
   op_conf_ = op_conf;
   InitFromOpConf();
@@ -93,13 +107,12 @@ void Operator::GenKernelConf(
     kernel_conf->set_need_do_data_id(true);
   }
   kernel_conf->set_is_forward(is_forward);
-  if (output_bns_.empty() == false) {
-    kernel_conf->set_data_type(GetBlobDesc4BnInOp(output_bns_[0])->data_type());
-  } else if (input_bns_.empty() == false) {
-    kernel_conf->set_data_type(GetBlobDesc4BnInOp(input_bns_[0])->data_type());
-  } else {
-    kernel_conf->set_data_type(DataType::kInvalidDataType);
+  DataType data_type =
+      GetDataTypeFromBnInOpVec(GetBlobDesc4BnInOp, output_bns_);
+  if (data_type == DataType::kInvalidDataType) {
+    data_type = GetDataTypeFromBnInOpVec(GetBlobDesc4BnInOp, input_bns_);
   }
+  kernel_conf->set_data_type(data_type);
   VirtualGenKernelConf(GetBlobDesc4BnInOp, parallel_ctx, kernel_conf);
 }