diff --git a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.cc b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.cc
index 04b380ce55..a1805204c5 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.cc
+++ b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.cc
@@ -74,7 +74,7 @@ std::shared_ptr<SamplerObj> CacheLookupNode::SamplerCopy() {
   return std::static_pointer_cast<SamplerObj>(lookup_node_copy_);
 }
 
-Status CacheLookupNode::SamplerBuild(std::shared_ptr<SamplerRT> *out) {
+Status CacheLookupNode::SamplerBuild(std::shared_ptr<SamplerRT> *const out) {
   // Runtime cache lookup op should already been built, so we just return it here
   auto lookup_op = std::dynamic_pointer_cast<CacheLookupOp>(lookup_op_);
   *out = std::shared_ptr<SamplerRT>(lookup_op);
diff --git a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.h b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.h
index 129bc843b8..7c0e6643f3 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.h
+++ b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/cache_lookup_node.h
@@ -50,7 +50,7 @@ class CacheLookupNode : public DatasetNode, public SamplerObj {
   /// \brief a base class override function to convert a SamplerObj class into a runtime sampler object
   /// \param[out] out Shared pointer to the newly created Sampler
   /// \return The Status code of the function. It returns OK status if sampler is created successfully.
-  Status SamplerBuild(std::shared_ptr<SamplerRT> *out) override;
+  Status SamplerBuild(std::shared_ptr<SamplerRT> *const out) override;
 
   /// \brief a base class override function to copy a SamplerObj class
   /// \return Shared pointers to the newly copied SamplerObj
diff --git a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.cc b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.cc
index 701cdf3e59..af16967d54 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.cc
+++ b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.cc
@@ -42,7 +42,7 @@ namespace dataset {
 // Constructor
 SamplerObj::SamplerObj() {}
 
-Status SamplerObj::BuildChildren(std::shared_ptr<SamplerRT> *sampler) {
+Status SamplerObj::BuildChildren(std::shared_ptr<SamplerRT> *const sampler) {
   for (auto child : children_) {
     std::shared_ptr<SamplerRT> sampler_rt = nullptr;
     RETURN_IF_NOT_OK(child->SamplerBuild(&sampler_rt));
@@ -133,7 +133,7 @@ std::shared_ptr<mindrecord::ShardOperator> DistributedSamplerObj::BuildForMindDa
 }
 #endif
 
-Status DistributedSamplerObj::to_json(nlohmann::json *out_json) {
+Status DistributedSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "DistributedSampler";
   args["num_shards"] = num_shards_;
@@ -170,7 +170,7 @@ Status PKSamplerObj::ValidateParams() {
   return Status::OK();
 }
 
-Status PKSamplerObj::to_json(nlohmann::json *out_json) {
+Status PKSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "PKSampler";
   args["num_val"] = num_val_;
@@ -222,13 +222,12 @@ PreBuiltSamplerObj::PreBuiltSamplerObj(std::shared_ptr<mindrecord::ShardOperator
 
 Status PreBuiltSamplerObj::ValidateParams() { return Status::OK(); }
 
-Status PreBuiltSamplerObj::SamplerBuild(std::shared_ptr<SamplerRT> *sampler) {
+Status PreBuiltSamplerObj::SamplerBuild(std::shared_ptr<SamplerRT> *const sampler) {
   Status s = BuildChildren(&sp_);
   if (s.IsOk())
     *sampler = sp_;
   else
     *sampler = nullptr;
-  // FIXME: what to do with sp_ if status is not OK?
   return s;
 }
 
@@ -253,7 +252,7 @@ std::shared_ptr<SamplerObj> PreBuiltSamplerObj::SamplerCopy() {
   return sampler;
 }
 
-Status PreBuiltSamplerObj::to_json(nlohmann::json *out_json) {
+Status PreBuiltSamplerObj::to_json(nlohmann::json *const out_json) {
   RETURN_IF_NOT_OK(sp_->to_json(out_json));
   return Status::OK();
 }
@@ -270,7 +269,7 @@ Status RandomSamplerObj::ValidateParams() {
   return Status::OK();
 }
 
-Status RandomSamplerObj::to_json(nlohmann::json *out_json) {
+Status RandomSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "RandomSampler";
   args["replacement"] = replacement_;
@@ -325,7 +324,7 @@ Status SequentialSamplerObj::ValidateParams() {
   return Status::OK();
 }
 
-Status SequentialSamplerObj::to_json(nlohmann::json *out_json) {
+Status SequentialSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "SequentialSampler";
   args["start_index"] = start_index_;
@@ -389,7 +388,7 @@ std::shared_ptr<mindrecord::ShardOperator> SubsetSamplerObj::BuildForMindDataset
   return mind_sampler;
 }
 #endif
-Status SubsetSamplerObj::to_json(nlohmann::json *out_json) {
+Status SubsetSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "SubsetSampler";
   args["indices"] = indices_;
@@ -428,7 +427,7 @@ std::shared_ptr<mindrecord::ShardOperator> SubsetRandomSamplerObj::BuildForMindD
 }
 #endif
 
-Status SubsetRandomSamplerObj::to_json(nlohmann::json *out_json) {
+Status SubsetRandomSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "SubsetRandomSampler";
   args["indices"] = indices_;
@@ -474,7 +473,7 @@ Status WeightedRandomSamplerObj::ValidateParams() {
   return Status::OK();
 }
 
-Status WeightedRandomSamplerObj::to_json(nlohmann::json *out_json) {
+Status WeightedRandomSamplerObj::to_json(nlohmann::json *const out_json) {
   nlohmann::json args;
   args["sampler_name"] = "WeightedRandomSampler";
   args["weights"] = weights_;
diff --git a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.h b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.h
index e0eb109d8d..01a6823098 100644
--- a/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.h
+++ b/mindspore/ccsrc/minddata/dataset/engine/ir/datasetops/source/samplers/samplers_ir.h
@@ -65,7 +65,7 @@ class SamplerObj {
   /// \return the Status code returned
   Status AddChildSampler(std::shared_ptr<SamplerObj> child);
 
-  virtual Status to_json(nlohmann::json *out_json) { return Status::OK(); }
+  virtual Status to_json(nlohmann::json *const out_json) { return Status::OK(); }
 
   std::vector<std::shared_ptr<SamplerObj>> GetChild() { return children_; }
 
@@ -80,7 +80,7 @@ class SamplerObj {
   /// \brief A function that calls build on the children of this sampler
   /// \param[in] sampler The samplerRT object built from this sampler
   /// \return the Status code returned
-  Status BuildChildren(std::shared_ptr<SamplerRT> *sampler);
+  Status BuildChildren(std::shared_ptr<SamplerRT> *const sampler);
 
   std::vector<std::shared_ptr<SamplerObj>> children_;
 };
@@ -111,7 +111,7 @@ class DistributedSamplerObj : public SamplerObj {
   /// \brief Get the arguments of node
   /// \param[out] out_json JSON string of all attributes
   /// \return Status of the function
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status ValidateParams() override;
 
@@ -152,7 +152,7 @@ class PKSamplerObj : public SamplerObj {
   /// \brief Get the arguments of node
   /// \param[out] out_json JSON string of all attributes
   /// \return Status of the function
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status ValidateParams() override;
 
@@ -171,7 +171,7 @@ class PreBuiltSamplerObj : public SamplerObj {
 
   ~PreBuiltSamplerObj() = default;
 
-  Status SamplerBuild(std::shared_ptr<SamplerRT> *sampler) override;
+  Status SamplerBuild(std::shared_ptr<SamplerRT> *const sampler) override;
 
 #ifndef ENABLE_ANDROID
   std::shared_ptr<mindrecord::ShardOperator> BuildForMindDataset() override;
@@ -181,7 +181,7 @@ class PreBuiltSamplerObj : public SamplerObj {
 
   Status ValidateParams() override;
 
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
  private:
   std::shared_ptr<SamplerRT> sp_;
@@ -213,7 +213,7 @@ class RandomSamplerObj : public SamplerObj {
   /// \brief Get the arguments of node
   /// \param[out] out_json JSON string of all attributes
   /// \return Status of the function
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status ValidateParams() override;
 
@@ -246,7 +246,7 @@ class SequentialSamplerObj : public SamplerObj {
   /// \brief Get the arguments of node
   /// \param[out] out_json JSON string of all attributes
   /// \return Status of the function
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status ValidateParams() override;
 
@@ -278,7 +278,7 @@ class SubsetSamplerObj : public SamplerObj {
   /// \brief Get the arguments of node
   /// \param[out] out_json JSON string of all attributes
   /// \return Status of the function
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status ValidateParams() override;
 
@@ -293,7 +293,7 @@ class SubsetRandomSamplerObj : public SubsetSamplerObj {
 
   ~SubsetRandomSamplerObj() = default;
 
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status SamplerBuild(std::shared_ptr<SamplerRT> *sampler) override;
 
@@ -331,7 +331,7 @@ class WeightedRandomSamplerObj : public SamplerObj {
   /// \brief Get the arguments of node
   /// \param[out] out_json JSON string of all attributes
   /// \return Status of the function
-  Status to_json(nlohmann::json *out_json) override;
+  Status to_json(nlohmann::json *const out_json) override;
 
   Status ValidateParams() override;