Move the operation_mode enumeration to its own header

Author: Cydral

dlib/cuda/cudnn_dlibapi.h

@@ -3,9 +3,10 @@
 #ifndef DLIB_DNN_CuDNN_H_
 #define DLIB_DNN_CuDNN_H_
 
+#include <memory>
+#include "operation_mode.h"
 #ifdef DLIB_USE_CUDA
 #include "cuda_errors.h"
-#include <memory>
 #include "cuda_data_ptr.h"
 #endif // DLIB_USE_CUDA
 
@@ -14,17 +15,6 @@ namespace dlib
     class tensor;
     class resizable_tensor;
 
-    // ----------------------------------------------------------------------------------------
-
-    /*!
-        This enum is used to determine the mode of operation for certain functions
-        (such as gemm and softmax) in Dlib. It specifies whether the calculation
-        should be performed based on the matrix field in nr()xnc() or if the matrix
-        should be considered in num_samples()xk(). This helps in organizing tensor
-        computations more efficiently according to the required dimensions.
-    !*/
-    enum class operation_mode { CHANNEL_WISE = 0, PLANE_WISE = 1 };
-
 #ifdef DLIB_USE_CUDA
     namespace cuda 
     {

dlib/cuda/operation_mode.h

@@ -0,0 +1,23 @@
+// Copyright (C) 2024  Davis E. King ([email protected])
+// License: Boost Software License   See LICENSE.txt for the full license.
+#ifndef DLIB_CUDA_OPERATION_MODE_H
+#define DLIB_CUDA_OPERATION_MODE_H
+
+namespace dlib
+{
+// ----------------------------------------------------------------------------------------
+
+    /*!
+        This enum is used to determine the mode of operation for certain functions
+        (such as gemm and softmax) in Dlib. It specifies whether the calculation
+        should be performed based on the matrix field in nr()xnc() or if the matrix
+        should be considered in num_samples()xk(). This helps in organizing tensor
+        computations more efficiently according to the required dimensions.
+    */
+    enum class operation_mode { CHANNEL_WISE = 0, PLANE_WISE = 1 };
+
+// ----------------------------------------------------------------------------------------
+
+} // namespace dlib
+
+#endif // DLIB_CUDA_OPERATION_MODE_H