diff --git a/R-package/src/R_object_helper.h b/R-package/src/R_object_helper.h
index a51927baf428..0d51902da1dd 100644
--- a/R-package/src/R_object_helper.h
+++ b/R-package/src/R_object_helper.h
@@ -102,8 +102,6 @@ typedef union { VECTOR_SER s; double align; } SEXPREC_ALIGN;
 
 #define R_REAL_PTR(x)  (reinterpret_cast<double*> DATAPTR(x))
 
-#define R_AS_INT(x)    (*(reinterpret_cast<int*> DATAPTR(x)))
-
 #define R_IS_NULL(x)   ((*reinterpret_cast<LGBM_SE>(x)).sxpinfo.type == 0)
 
 // 64bit pointer
diff --git a/R-package/src/lightgbm_R.cpp b/R-package/src/lightgbm_R.cpp
index 3bffdc40dda7..4d4adb84be3b 100644
--- a/R-package/src/lightgbm_R.cpp
+++ b/R-package/src/lightgbm_R.cpp
@@ -43,12 +43,12 @@ using LightGBM::Common::Join;
 using LightGBM::Common::Split;
 using LightGBM::Log;
 
-LGBM_SE EncodeChar(LGBM_SE dest, const char* src, LGBM_SE buf_len, LGBM_SE actual_len, size_t str_len) {
+LGBM_SE EncodeChar(LGBM_SE dest, const char* src, SEXP buf_len, LGBM_SE actual_len, size_t str_len) {
   if (str_len > INT32_MAX) {
     Log::Fatal("Don't support large string in R-package");
   }
   R_INT_PTR(actual_len)[0] = static_cast<int>(str_len);
-  if (R_AS_INT(buf_len) < static_cast<int>(str_len)) {
+  if (Rf_asInteger(buf_len) < static_cast<int>(str_len)) {
     return dest;
   }
   auto ptr = R_CHAR_PTR(dest);
@@ -79,9 +79,9 @@ SEXP LGBM_DatasetCreateFromFile_R(LGBM_SE filename,
 SEXP LGBM_DatasetCreateFromCSC_R(LGBM_SE indptr,
   LGBM_SE indices,
   LGBM_SE data,
-  LGBM_SE num_indptr,
-  LGBM_SE nelem,
-  LGBM_SE num_row,
+  SEXP num_indptr,
+  SEXP nelem,
+  SEXP num_row,
   LGBM_SE parameters,
   LGBM_SE reference,
   LGBM_SE out) {
@@ -90,9 +90,9 @@ SEXP LGBM_DatasetCreateFromCSC_R(LGBM_SE indptr,
   const int* p_indices = R_INT_PTR(indices);
   const double* p_data = R_REAL_PTR(data);
 
-  int64_t nindptr = static_cast<int64_t>(R_AS_INT(num_indptr));
-  int64_t ndata = static_cast<int64_t>(R_AS_INT(nelem));
-  int64_t nrow = static_cast<int64_t>(R_AS_INT(num_row));
+  int64_t nindptr = static_cast<int64_t>(Rf_asInteger(num_indptr));
+  int64_t ndata = static_cast<int64_t>(Rf_asInteger(nelem));
+  int64_t nrow = static_cast<int64_t>(Rf_asInteger(num_row));
   DatasetHandle handle = nullptr;
   CHECK_CALL(LGBM_DatasetCreateFromCSC(p_indptr, C_API_DTYPE_INT32, p_indices,
     p_data, C_API_DTYPE_FLOAT64, nindptr, ndata,
@@ -102,14 +102,14 @@ SEXP LGBM_DatasetCreateFromCSC_R(LGBM_SE indptr,
 }
 
 SEXP LGBM_DatasetCreateFromMat_R(LGBM_SE data,
-  LGBM_SE num_row,
-  LGBM_SE num_col,
+  SEXP num_row,
+  SEXP num_col,
   LGBM_SE parameters,
   LGBM_SE reference,
   LGBM_SE out) {
   R_API_BEGIN();
-  int32_t nrow = static_cast<int32_t>(R_AS_INT(num_row));
-  int32_t ncol = static_cast<int32_t>(R_AS_INT(num_col));
+  int32_t nrow = static_cast<int32_t>(Rf_asInteger(num_row));
+  int32_t ncol = static_cast<int32_t>(Rf_asInteger(num_col));
   double* p_mat = R_REAL_PTR(data);
   DatasetHandle handle = nullptr;
   CHECK_CALL(LGBM_DatasetCreateFromMat(p_mat, C_API_DTYPE_FLOAT64, nrow, ncol, COL_MAJOR,
@@ -120,11 +120,11 @@ SEXP LGBM_DatasetCreateFromMat_R(LGBM_SE data,
 
 SEXP LGBM_DatasetGetSubset_R(LGBM_SE handle,
   LGBM_SE used_row_indices,
-  LGBM_SE len_used_row_indices,
+  SEXP len_used_row_indices,
   LGBM_SE parameters,
   LGBM_SE out) {
   R_API_BEGIN();
-  int len = R_AS_INT(len_used_row_indices);
+  int len = Rf_asInteger(len_used_row_indices);
   std::vector<int> idxvec(len);
   // convert from one-based to  zero-based index
 #pragma omp parallel for schedule(static, 512) if (len >= 1024)
@@ -154,7 +154,7 @@ SEXP LGBM_DatasetSetFeatureNames_R(LGBM_SE handle,
 }
 
 SEXP LGBM_DatasetGetFeatureNames_R(LGBM_SE handle,
-  LGBM_SE buf_len,
+  SEXP buf_len,
   LGBM_SE actual_len,
   LGBM_SE feature_names) {
   R_API_BEGIN();
@@ -202,9 +202,9 @@ SEXP LGBM_DatasetFree_R(LGBM_SE handle) {
 SEXP LGBM_DatasetSetField_R(LGBM_SE handle,
   LGBM_SE field_name,
   LGBM_SE field_data,
-  LGBM_SE num_element) {
+  SEXP num_element) {
   R_API_BEGIN();
-  int len = static_cast<int>(R_AS_INT(num_element));
+  int len = static_cast<int>(Rf_asInteger(num_element));
   const char* name = R_CHAR_PTR(field_name);
   if (!strcmp("group", name) || !strcmp("query", name)) {
     std::vector<int32_t> vec(len);
@@ -387,10 +387,10 @@ SEXP LGBM_BoosterUpdateOneIter_R(LGBM_SE handle) {
 SEXP LGBM_BoosterUpdateOneIterCustom_R(LGBM_SE handle,
   LGBM_SE grad,
   LGBM_SE hess,
-  LGBM_SE len) {
+  SEXP len) {
   int is_finished = 0;
   R_API_BEGIN();
-  int int_len = R_AS_INT(len);
+  int int_len = Rf_asInteger(len);
   std::vector<float> tgrad(int_len), thess(int_len);
 #pragma omp parallel for schedule(static, 512) if (int_len >= 1024)
   for (int j = 0; j < int_len; ++j) {
@@ -433,7 +433,7 @@ SEXP LGBM_BoosterGetLowerBoundValue_R(LGBM_SE handle,
 }
 
 SEXP LGBM_BoosterGetEvalNames_R(LGBM_SE handle,
-  LGBM_SE buf_len,
+  SEXP buf_len,
   LGBM_SE actual_len,
   LGBM_SE eval_names) {
   R_API_BEGIN();
@@ -464,47 +464,47 @@ SEXP LGBM_BoosterGetEvalNames_R(LGBM_SE handle,
 }
 
 SEXP LGBM_BoosterGetEval_R(LGBM_SE handle,
-  LGBM_SE data_idx,
+  SEXP data_idx,
   LGBM_SE out_result) {
   R_API_BEGIN();
   int len;
   CHECK_CALL(LGBM_BoosterGetEvalCounts(R_GET_PTR(handle), &len));
   double* ptr_ret = R_REAL_PTR(out_result);
   int out_len;
-  CHECK_CALL(LGBM_BoosterGetEval(R_GET_PTR(handle), R_AS_INT(data_idx), &out_len, ptr_ret));
+  CHECK_CALL(LGBM_BoosterGetEval(R_GET_PTR(handle), Rf_asInteger(data_idx), &out_len, ptr_ret));
   CHECK_EQ(out_len, len);
   R_API_END();
 }
 
 SEXP LGBM_BoosterGetNumPredict_R(LGBM_SE handle,
-  LGBM_SE data_idx,
+  SEXP data_idx,
   LGBM_SE out) {
   R_API_BEGIN();
   int64_t len;
-  CHECK_CALL(LGBM_BoosterGetNumPredict(R_GET_PTR(handle), R_AS_INT(data_idx), &len));
+  CHECK_CALL(LGBM_BoosterGetNumPredict(R_GET_PTR(handle), Rf_asInteger(data_idx), &len));
   R_INT_PTR(out)[0] = static_cast<int>(len);
   R_API_END();
 }
 
 SEXP LGBM_BoosterGetPredict_R(LGBM_SE handle,
-  LGBM_SE data_idx,
+  SEXP data_idx,
   LGBM_SE out_result) {
   R_API_BEGIN();
   double* ptr_ret = R_REAL_PTR(out_result);
   int64_t out_len;
-  CHECK_CALL(LGBM_BoosterGetPredict(R_GET_PTR(handle), R_AS_INT(data_idx), &out_len, ptr_ret));
+  CHECK_CALL(LGBM_BoosterGetPredict(R_GET_PTR(handle), Rf_asInteger(data_idx), &out_len, ptr_ret));
   R_API_END();
 }
 
-int GetPredictType(LGBM_SE is_rawscore, LGBM_SE is_leafidx, LGBM_SE is_predcontrib) {
+int GetPredictType(SEXP is_rawscore, SEXP is_leafidx, SEXP is_predcontrib) {
   int pred_type = C_API_PREDICT_NORMAL;
-  if (R_AS_INT(is_rawscore)) {
+  if (Rf_asInteger(is_rawscore)) {
     pred_type = C_API_PREDICT_RAW_SCORE;
   }
-  if (R_AS_INT(is_leafidx)) {
+  if (Rf_asInteger(is_leafidx)) {
     pred_type = C_API_PREDICT_LEAF_INDEX;
   }
-  if (R_AS_INT(is_predcontrib)) {
+  if (Rf_asInteger(is_predcontrib)) {
     pred_type = C_API_PREDICT_CONTRIB;
   }
   return pred_type;
@@ -512,35 +512,35 @@ int GetPredictType(LGBM_SE is_rawscore, LGBM_SE is_leafidx, LGBM_SE is_predcontr
 
 SEXP LGBM_BoosterPredictForFile_R(LGBM_SE handle,
   LGBM_SE data_filename,
-  LGBM_SE data_has_header,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP data_has_header,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE parameter,
   LGBM_SE result_filename) {
   R_API_BEGIN();
   int pred_type = GetPredictType(is_rawscore, is_leafidx, is_predcontrib);
   CHECK_CALL(LGBM_BoosterPredictForFile(R_GET_PTR(handle), R_CHAR_PTR(data_filename),
-    R_AS_INT(data_has_header), pred_type, R_AS_INT(start_iteration), R_AS_INT(num_iteration), R_CHAR_PTR(parameter),
+    Rf_asInteger(data_has_header), pred_type, Rf_asInteger(start_iteration), Rf_asInteger(num_iteration), R_CHAR_PTR(parameter),
     R_CHAR_PTR(result_filename)));
   R_API_END();
 }
 
 SEXP LGBM_BoosterCalcNumPredict_R(LGBM_SE handle,
-  LGBM_SE num_row,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP num_row,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE out_len) {
   R_API_BEGIN();
   int pred_type = GetPredictType(is_rawscore, is_leafidx, is_predcontrib);
   int64_t len = 0;
-  CHECK_CALL(LGBM_BoosterCalcNumPredict(R_GET_PTR(handle), R_AS_INT(num_row),
-    pred_type, R_AS_INT(start_iteration), R_AS_INT(num_iteration), &len));
+  CHECK_CALL(LGBM_BoosterCalcNumPredict(R_GET_PTR(handle), Rf_asInteger(num_row),
+    pred_type, Rf_asInteger(start_iteration), Rf_asInteger(num_iteration), &len));
   R_INT_PTR(out_len)[0] = static_cast<int>(len);
   R_API_END();
 }
@@ -549,14 +549,14 @@ SEXP LGBM_BoosterPredictForCSC_R(LGBM_SE handle,
   LGBM_SE indptr,
   LGBM_SE indices,
   LGBM_SE data,
-  LGBM_SE num_indptr,
-  LGBM_SE nelem,
-  LGBM_SE num_row,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP num_indptr,
+  SEXP nelem,
+  SEXP num_row,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE parameter,
   LGBM_SE out_result) {
   R_API_BEGIN();
@@ -566,78 +566,80 @@ SEXP LGBM_BoosterPredictForCSC_R(LGBM_SE handle,
   const int* p_indices = R_INT_PTR(indices);
   const double* p_data = R_REAL_PTR(data);
 
-  int64_t nindptr = R_AS_INT(num_indptr);
-  int64_t ndata = R_AS_INT(nelem);
-  int64_t nrow = R_AS_INT(num_row);
+  int64_t nindptr = Rf_asInteger(num_indptr);
+  int64_t ndata = Rf_asInteger(nelem);
+  int64_t nrow = Rf_asInteger(num_row);
   double* ptr_ret = R_REAL_PTR(out_result);
   int64_t out_len;
   CHECK_CALL(LGBM_BoosterPredictForCSC(R_GET_PTR(handle),
     p_indptr, C_API_DTYPE_INT32, p_indices,
     p_data, C_API_DTYPE_FLOAT64, nindptr, ndata,
-    nrow, pred_type,  R_AS_INT(start_iteration), R_AS_INT(num_iteration), R_CHAR_PTR(parameter), &out_len, ptr_ret));
+    nrow, pred_type,  Rf_asInteger(start_iteration), Rf_asInteger(num_iteration), R_CHAR_PTR(parameter), &out_len, ptr_ret));
   R_API_END();
 }
 
 SEXP LGBM_BoosterPredictForMat_R(LGBM_SE handle,
   LGBM_SE data,
-  LGBM_SE num_row,
-  LGBM_SE num_col,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP num_row,
+  SEXP num_col,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE parameter,
   LGBM_SE out_result) {
   R_API_BEGIN();
   int pred_type = GetPredictType(is_rawscore, is_leafidx, is_predcontrib);
 
-  int32_t nrow = R_AS_INT(num_row);
-  int32_t ncol = R_AS_INT(num_col);
+  int32_t nrow = Rf_asInteger(num_row);
+  int32_t ncol = Rf_asInteger(num_col);
 
   const double* p_mat = R_REAL_PTR(data);
   double* ptr_ret = R_REAL_PTR(out_result);
   int64_t out_len;
   CHECK_CALL(LGBM_BoosterPredictForMat(R_GET_PTR(handle),
     p_mat, C_API_DTYPE_FLOAT64, nrow, ncol, COL_MAJOR,
-    pred_type, R_AS_INT(start_iteration), R_AS_INT(num_iteration), R_CHAR_PTR(parameter), &out_len, ptr_ret));
+    pred_type, Rf_asInteger(start_iteration), Rf_asInteger(num_iteration), R_CHAR_PTR(parameter), &out_len, ptr_ret));
 
   R_API_END();
 }
 
 SEXP LGBM_BoosterSaveModel_R(LGBM_SE handle,
-  LGBM_SE num_iteration,
-  LGBM_SE feature_importance_type,
+  SEXP num_iteration,
+  SEXP feature_importance_type,
   LGBM_SE filename) {
   R_API_BEGIN();
-  CHECK_CALL(LGBM_BoosterSaveModel(R_GET_PTR(handle), 0, R_AS_INT(num_iteration), R_AS_INT(feature_importance_type), R_CHAR_PTR(filename)));
+  CHECK_CALL(LGBM_BoosterSaveModel(R_GET_PTR(handle), 0, Rf_asInteger(num_iteration), Rf_asInteger(feature_importance_type), R_CHAR_PTR(filename)));
   R_API_END();
 }
 
 SEXP LGBM_BoosterSaveModelToString_R(LGBM_SE handle,
-  LGBM_SE num_iteration,
-  LGBM_SE feature_importance_type,
-  LGBM_SE buffer_len,
+  SEXP num_iteration,
+  SEXP feature_importance_type,
+  SEXP buffer_len,
   LGBM_SE actual_len,
   LGBM_SE out_str) {
   R_API_BEGIN();
   int64_t out_len = 0;
-  std::vector<char> inner_char_buf(R_AS_INT(buffer_len));
-  CHECK_CALL(LGBM_BoosterSaveModelToString(R_GET_PTR(handle), 0, R_AS_INT(num_iteration), R_AS_INT(feature_importance_type), R_AS_INT(buffer_len), &out_len, inner_char_buf.data()));
+  int64_t buf_len = static_cast<int64_t>(Rf_asInteger(buffer_len));
+  std::vector<char> inner_char_buf(buf_len);
+  CHECK_CALL(LGBM_BoosterSaveModelToString(R_GET_PTR(handle), 0, Rf_asInteger(num_iteration), Rf_asInteger(feature_importance_type), buf_len, &out_len, inner_char_buf.data()));
   EncodeChar(out_str, inner_char_buf.data(), buffer_len, actual_len, static_cast<size_t>(out_len));
   R_API_END();
 }
 
 SEXP LGBM_BoosterDumpModel_R(LGBM_SE handle,
-  LGBM_SE num_iteration,
-  LGBM_SE feature_importance_type,
-  LGBM_SE buffer_len,
+  SEXP num_iteration,
+  SEXP feature_importance_type,
+  SEXP buffer_len,
   LGBM_SE actual_len,
   LGBM_SE out_str) {
   R_API_BEGIN();
   int64_t out_len = 0;
-  std::vector<char> inner_char_buf(R_AS_INT(buffer_len));
-  CHECK_CALL(LGBM_BoosterDumpModel(R_GET_PTR(handle), 0, R_AS_INT(num_iteration), R_AS_INT(feature_importance_type), R_AS_INT(buffer_len), &out_len, inner_char_buf.data()));
+  int64_t buf_len = static_cast<int64_t>(Rf_asInteger(buffer_len));
+  std::vector<char> inner_char_buf(buf_len);
+  CHECK_CALL(LGBM_BoosterDumpModel(R_GET_PTR(handle), 0, Rf_asInteger(num_iteration), Rf_asInteger(feature_importance_type), buf_len, &out_len, inner_char_buf.data()));
   EncodeChar(out_str, inner_char_buf.data(), buffer_len, actual_len, static_cast<size_t>(out_len));
   R_API_END();
 }
diff --git a/R-package/src/lightgbm_R.h b/R-package/src/lightgbm_R.h
index c262c3172ca4..5ef54385f256 100644
--- a/R-package/src/lightgbm_R.h
+++ b/R-package/src/lightgbm_R.h
@@ -44,7 +44,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromFile_R(
 * \param indptr pointer to row headers
 * \param indices findex
 * \param data fvalue
-* \param nindptr number of cols in the matrix + 1
+* \param num_indptr number of cols in the matrix + 1
 * \param nelem number of nonzero elements in the matrix
 * \param num_row number of rows
 * \param parameters additional parameters
@@ -56,9 +56,9 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromCSC_R(
   LGBM_SE indptr,
   LGBM_SE indices,
   LGBM_SE data,
-  LGBM_SE nindptr,
-  LGBM_SE nelem,
-  LGBM_SE num_row,
+  SEXP num_indptr,
+  SEXP nelem,
+  SEXP num_row,
   LGBM_SE parameters,
   LGBM_SE reference,
   LGBM_SE out
@@ -67,8 +67,8 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromCSC_R(
 /*!
 * \brief create dataset from dense matrix
 * \param data matric data
-* \param nrow number of rows
-* \param ncol number columns
+* \param num_row number of rows
+* \param num_col number columns
 * \param parameters additional parameters
 * \param reference used to align bin mapper with other dataset, nullptr means not used
 * \param out created dataset
@@ -76,8 +76,8 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromCSC_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromMat_R(
   LGBM_SE data,
-  LGBM_SE nrow,
-  LGBM_SE ncol,
+  SEXP num_row,
+  SEXP num_col,
   LGBM_SE parameters,
   LGBM_SE reference,
   LGBM_SE out
@@ -95,7 +95,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromMat_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetSubset_R(
   LGBM_SE handle,
   LGBM_SE used_row_indices,
-  LGBM_SE len_used_row_indices,
+  SEXP len_used_row_indices,
   LGBM_SE parameters,
   LGBM_SE out
 );
@@ -119,7 +119,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetSetFeatureNames_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetFeatureNames_R(
   LGBM_SE handle,
-  LGBM_SE buf_len,
+  SEXP buf_len,
   LGBM_SE actual_len,
   LGBM_SE feature_names
 );
@@ -158,7 +158,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetSetField_R(
   LGBM_SE handle,
   LGBM_SE field_name,
   LGBM_SE field_data,
-  LGBM_SE num_element
+  SEXP num_element
 );
 
 /*!
@@ -343,7 +343,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterUpdateOneIterCustom_R(
   LGBM_SE handle,
   LGBM_SE grad,
   LGBM_SE hess,
-  LGBM_SE len
+  SEXP len
 );
 
 /*!
@@ -394,7 +394,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetLowerBoundValue_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEvalNames_R(
   LGBM_SE handle,
-  LGBM_SE buf_len,
+  SEXP buf_len,
   LGBM_SE actual_len,
   LGBM_SE eval_names
 );
@@ -408,7 +408,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEvalNames_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEval_R(
   LGBM_SE handle,
-  LGBM_SE data_idx,
+  SEXP data_idx,
   LGBM_SE out_result
 );
 
@@ -421,7 +421,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEval_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetNumPredict_R(
   LGBM_SE handle,
-  LGBM_SE data_idx,
+  SEXP data_idx,
   LGBM_SE out
 );
 
@@ -435,7 +435,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetNumPredict_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetPredict_R(
   LGBM_SE handle,
-  LGBM_SE data_idx,
+  SEXP data_idx,
   LGBM_SE out_result
 );
 
@@ -453,12 +453,12 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetPredict_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForFile_R(
   LGBM_SE handle,
   LGBM_SE data_filename,
-  LGBM_SE data_has_header,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP data_has_header,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE parameter,
   LGBM_SE result_filename
 );
@@ -475,12 +475,12 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForFile_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterCalcNumPredict_R(
   LGBM_SE handle,
-  LGBM_SE num_row,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP num_row,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE out_len
 );
 
@@ -493,7 +493,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterCalcNumPredict_R(
 * \param indptr pointer to row headers
 * \param indices findex
 * \param data fvalue
-* \param nindptr number of cols in the matrix + 1
+* \param num_indptr number of cols in the matrix + 1
 * \param nelem number of non-zero elements in the matrix
 * \param num_row number of rows
 * \param is_rawscore
@@ -507,14 +507,14 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForCSC_R(
   LGBM_SE indptr,
   LGBM_SE indices,
   LGBM_SE data,
-  LGBM_SE nindptr,
-  LGBM_SE nelem,
-  LGBM_SE num_row,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP num_indptr,
+  SEXP nelem,
+  SEXP num_row,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE parameter,
   LGBM_SE out_result
 );
@@ -526,8 +526,8 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForCSC_R(
 *               for leaf index, its length is equal to num_class * num_data * num_iteration
 * \param handle handle
 * \param data pointer to the data space
-* \param nrow number of rows
-* \param ncol number columns
+* \param num_row number of rows
+* \param num_col number columns
 * \param is_rawscore
 * \param is_leafidx
 * \param num_iteration number of iteration for prediction, <= 0 means no limit
@@ -537,13 +537,13 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForCSC_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForMat_R(
   LGBM_SE handle,
   LGBM_SE data,
-  LGBM_SE nrow,
-  LGBM_SE ncol,
-  LGBM_SE is_rawscore,
-  LGBM_SE is_leafidx,
-  LGBM_SE is_predcontrib,
-  LGBM_SE start_iteration,
-  LGBM_SE num_iteration,
+  SEXP num_row,
+  SEXP num_col,
+  SEXP is_rawscore,
+  SEXP is_leafidx,
+  SEXP is_predcontrib,
+  SEXP start_iteration,
+  SEXP num_iteration,
   LGBM_SE parameter,
   LGBM_SE out_result
 );
@@ -557,8 +557,8 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForMat_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterSaveModel_R(
   LGBM_SE handle,
-  LGBM_SE num_iteration,
-  LGBM_SE feature_importance_type,
+  SEXP num_iteration,
+  SEXP feature_importance_type,
   LGBM_SE filename
 );
 
@@ -571,9 +571,9 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterSaveModel_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterSaveModelToString_R(
   LGBM_SE handle,
-  LGBM_SE num_iteration,
-  LGBM_SE feature_importance_type,
-  LGBM_SE buffer_len,
+  SEXP num_iteration,
+  SEXP feature_importance_type,
+  SEXP buffer_len,
   LGBM_SE actual_len,
   LGBM_SE out_str
 );
@@ -587,9 +587,9 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterSaveModelToString_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterDumpModel_R(
   LGBM_SE handle,
-  LGBM_SE num_iteration,
-  LGBM_SE feature_importance_type,
-  LGBM_SE buffer_len,
+  SEXP num_iteration,
+  SEXP feature_importance_type,
+  SEXP buffer_len,
   LGBM_SE actual_len,
   LGBM_SE out_str
 );