diff --git a/common/convert_float_to_float16.cpp b/common/convert_float_to_float16.cpp
index 0cd0294..23a216e 100644
--- a/common/convert_float_to_float16.cpp
+++ b/common/convert_float_to_float16.cpp
@@ -6,7 +6,6 @@
 #include <cmath>
 #include <cstdint>
 #include <cstring>
-#include <limits>
 #include <memory>
 #include <optional>
 #include <string>
@@ -19,11 +18,7 @@
 
 #include <onnx/onnx_pb.h>
 
-
-void convert_float_to_float16(
-    ONNX_NAMESPACE::ModelProto & model,
-    bool force_fp16_initializers
-) noexcept;
+#include "convert_float_to_float16.h"
 
 
 namespace {
diff --git a/common/convert_float_to_float16.h b/common/convert_float_to_float16.h
new file mode 100644
index 0000000..670012a
--- /dev/null
+++ b/common/convert_float_to_float16.h
@@ -0,0 +1,19 @@
+#ifndef CONVERT_FLOAT_TO_FLOAT16_H
+#define CONVERT_FLOAT_TO_FLOAT16_H
+
+#include <string>
+#include <unordered_set>
+
+#include <onnx/onnx_pb.h>
+
+void convert_float_to_float16(
+    ONNX_NAMESPACE::ModelProto & model,
+    bool force_fp16_initializers
+    // , bool keep_io_types = True
+    // , bool disable_shape_infer = True
+    // , const std::optional<std::unordered_set<std::string>> op_block_list = DEFAULT_OP_BLOCK_LIST
+    // , const std::optional<std::unordered_set<std::string>> op_block_list = {}
+    , const std::unordered_set<std::string> & op_block_list
+) noexcept;
+
+#endif
diff --git a/common/onnx_utils.cpp b/common/onnx_utils.cpp
index 9c22898..5de7b67 100644
--- a/common/onnx_utils.cpp
+++ b/common/onnx_utils.cpp
@@ -8,6 +8,8 @@
 #include <onnx/onnx_pb.h>
 #include <onnx/shape_inference/implementation.h>
 
+#include "onnx_utils.h"
+
 
 using namespace std::string_literals;
 
diff --git a/common/onnx_utils.h b/common/onnx_utils.h
new file mode 100644
index 0000000..7041ab7
--- /dev/null
+++ b/common/onnx_utils.h
@@ -0,0 +1,18 @@
+#ifndef ONNX_UTILS_H
+#define ONNX_UTILS_H
+
+#include <cstdint>
+#include <string>
+#include <string_view>
+#include <variant>
+
+#include <onnx/onnx_pb.h>
+
+std::variant<std::string, ONNX_NAMESPACE::ModelProto> loadONNX(
+    const std::string_view & path,
+    int64_t tile_w,
+    int64_t tile_h,
+    bool path_is_serialization
+) noexcept;
+
+#endif
diff --git a/vsncnn/vs_ncnn.cpp b/vsncnn/vs_ncnn.cpp
index 8b06821..cabe182 100644
--- a/vsncnn/vs_ncnn.cpp
+++ b/vsncnn/vs_ncnn.cpp
@@ -22,17 +22,12 @@
 #include <net.h>
 #include <gpu.h>
 
-#include "config.h" // generated by cmake
 #include <onnx/common/version.h>
-#include "onnx2ncnn.hpp"
 
+#include "../common/onnx_utils.h"
+#include "onnx2ncnn.hpp"
 
-extern std::variant<std::string, ONNX_NAMESPACE::ModelProto> loadONNX(
-    const std::string_view & path,
-    int64_t tile_w,
-    int64_t tile_h,
-    bool path_is_serialization
-) noexcept;
+#include "config.h" // generated by cmake
 
 
 static const VSPlugin * myself = nullptr;
diff --git a/vsort/vs_onnxruntime.cpp b/vsort/vs_onnxruntime.cpp
index f463d27..2a62436 100644
--- a/vsort/vs_onnxruntime.cpp
+++ b/vsort/vs_onnxruntime.cpp
@@ -34,21 +34,10 @@ using namespace std::chrono_literals;
 #include <dml_provider_factory.h>
 #endif // ENABLE_DML
 
-#include "config.h"
-
+#include "../common/convert_float_to_float16.h"
+#include "../common/onnx_utils.h"
 
-extern std::variant<std::string, ONNX_NAMESPACE::ModelProto> loadONNX(
-    const std::string_view & path,
-    int64_t tile_w,
-    int64_t tile_h,
-    bool path_is_serialization
-) noexcept;
-
-extern void convert_float_to_float16(
-    ONNX_NAMESPACE::ModelProto & model,
-    bool force_fp16_initializers,
-    const std::unordered_set<std::string> & op_block_list
-) noexcept;
+#include "config.h"
 
 
 #ifdef ENABLE_COREML
diff --git a/vsov/vs_openvino.cpp b/vsov/vs_openvino.cpp
index 063c448..ce6dfe3 100644
--- a/vsov/vs_openvino.cpp
+++ b/vsov/vs_openvino.cpp
@@ -27,21 +27,10 @@
 #include <openvino/pass/visualize_tree.hpp>
 #endif // ENABLE_VISUALIZATION
 
-#include "config.h"
-
+#include "../common/convert_float_to_float16.h"
+#include "../common/onnx_utils.h"
 
-extern std::variant<std::string, ONNX_NAMESPACE::ModelProto> loadONNX(
-    const std::string_view & path,
-    int64_t tile_w,
-    int64_t tile_h,
-    bool path_is_serialization
-) noexcept;
-
-extern void convert_float_to_float16(
-    ONNX_NAMESPACE::ModelProto & model,
-    bool force_fp16_initializers,
-    const std::unordered_set<std::string> & op_block_list
-) noexcept;
+#include "config.h"
 
 
 using namespace std::string_literals;