diff --git a/mindspore/ccsrc/minddata/dataset/engine/execution_tree.h b/mindspore/ccsrc/minddata/dataset/engine/execution_tree.h
index adf0dc98be..f7d09ce3d7 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/execution_tree.h
+++ b/mindspore/ccsrc/minddata/dataset/engine/execution_tree.h
@@ -211,7 +211,7 @@ class ExecutionTree {
 
   // Return the pointer to the TaskGroup
   // @return raw pointer to the TaskGroup
-  TaskGroup *AllTasks() const { return tg_.get(); }
+  TaskGroup *const AllTasks() const { return tg_.get(); }
 
   // Return if the ExecutionTree is at end of epoch status
   // @return bool - true is ExecutionTree is end of epoch status
diff --git a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/coco_node.cc b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/coco_node.cc
index 5d9953d8b7..e4fd99c4ab 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/coco_node.cc
+++ b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/coco_node.cc
@@ -65,7 +65,7 @@ Status CocoNode::ValidateParams() {
 
 // Function to build CocoNode
 Status CocoNode::Build(std::vector<std::shared_ptr<DatasetOp>> *node_ops) {
-  CocoOp::TaskType task_type;
+  CocoOp::TaskType task_type = CocoOp::TaskType::Detection;
   if (task_ == "Detection") {
     task_type = CocoOp::TaskType::Detection;
   } else if (task_ == "Stuff") {
@@ -74,6 +74,10 @@ Status CocoNode::Build(std::vector<std::shared_ptr<DatasetOp>> *node_ops) {
     task_type = CocoOp::TaskType::Keypoint;
   } else if (task_ == "Panoptic") {
     task_type = CocoOp::TaskType::Panoptic;
+  } else {
+    std::string err_msg = "Task type:'" + task_ + "' is not supported.";
+    MS_LOG(ERROR) << err_msg;
+    RETURN_STATUS_UNEXPECTED(err_msg);
   }
 
   std::unique_ptr<DataSchema> schema = std::make_unique<DataSchema>();
diff --git a/mindspore/ccsrc/minddata/dataset/engine/opt/post/auto_worker_pass.h b/mindspore/ccsrc/minddata/dataset/engine/opt/post/auto_worker_pass.h
index 9c336b5570..d965f103d2 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/opt/post/auto_worker_pass.h
+++ b/mindspore/ccsrc/minddata/dataset/engine/opt/post/auto_worker_pass.h
@@ -47,6 +47,9 @@ class AutoWorkerPass : public IRTreePass {
         max_num_workers_(8),
         thread_cnt_(GlobalContext::Instance()->config_manager()->num_cpu_threads()) {}
 
+  /// \brief destructor, by doing "= default", compiler will automatically generate the correct destructor
+  ~AutoWorkerPass() = default;
+
   Status RunOnTree(std::shared_ptr<DatasetNode> root_ir, bool *) override;
 
  private:
@@ -54,6 +57,10 @@ class AutoWorkerPass : public IRTreePass {
    public:
     explicit OpWeightPass(const std::map<std::string, float> &weight_profile)
         : IRNodePass(), weight_sum_(0), weight_profile_(weight_profile) {}
+
+    /// \brief destructor, by doing "= default", compiler will automatically generate the correct destructor
+    ~OpWeightPass() = default;
+
     // this is the base class function which contains the logic to handle most of the pipeline ops
     // pipeline ops although can't config num_workers it still runs 1 thread they need to be factored into weight
     Status Visit(std::shared_ptr<DatasetNode> node, bool *modified) override;
diff --git a/mindspore/ccsrc/minddata/dataset/engine/tree_adapter.h b/mindspore/ccsrc/minddata/dataset/engine/tree_adapter.h
index 2bee9be54a..b3a3b0fc3d 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/tree_adapter.h
+++ b/mindspore/ccsrc/minddata/dataset/engine/tree_adapter.h
@@ -51,15 +51,15 @@ class TreeAdapter {
   // 2. GetNext will return empty row when eoe/eof is obtained
   Status GetNext(TensorRow *);
 
-  // This function will return the root of the execution tree.
-  std::weak_ptr<DatasetOp> GetRoot() { return tree_ != nullptr ? tree_->root() : nullptr; }
+  // unique_ptr overloads operator bool(), will return false if it doesn't manage an object
+  std::weak_ptr<DatasetOp> GetRoot() { return tree_ ? tree_->root() : nullptr; }
 
   // This function will return the column_name_map once BuildAndPrepare() is called
   std::unordered_map<std::string, int32_t> GetColumnNameMap() const { return column_name_map_; }
 
   // This function returns the TaskGroup associated with ExeTree. This is needed by DeviceQueueConsumer
   // to be able to launch a thread. BuildAndPrepare needs to be called before this function
-  TaskGroup *AllTasks() const { return tree_ != nullptr ? tree_->AllTasks() : nullptr; }
+  TaskGroup *const AllTasks() const { return tree_ ? tree_->AllTasks() : nullptr; }
 
   Status Launch() const;