removed unused generic builder

mlx-nn/src/utils.rs

@@ -52,22 +52,3 @@ pub(crate) fn get_mut_or_insert_with<'a>(
 
     map.get_mut(key).unwrap()
 }
-
-/// A generic builder type for optional fields.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct Builder<T> {
-    /// The inner value
-    pub inner: T,
-}
-
-impl<T> Builder<T> {
-    /// Creates a new builder
-    pub fn new(inner: T) -> Self {
-        Self { inner }
-    }
-
-    /// Builds the inner value
-    pub fn build(self) -> T {
-        self.inner
-    }
-}