Fixed the newly defined math function to actually work with cuda

src/linalg/mat.cu

@@ -53,10 +53,4 @@ __device__ float clamp(float value, float min, float max) {
 // Normalize a float to the range [0, 1]
 __device__ float normalize(float value, float min, float max) {
   return (value - min) / (max - min);
-}
-
-// Interpolate between two values
-template <typename T>
-__device__ T interpolate(T start, T end, float t) {
-  return start + t * (end - start);
-}
+}