diff --git a/src/preprocessing/data_traits.rs b/src/preprocessing/data_traits.rs
index 16924bb..38d9e3e 100644
--- a/src/preprocessing/data_traits.rs
+++ b/src/preprocessing/data_traits.rs
@@ -1,11 +1,12 @@
 //! Traits to indicate that float variables can be viewed as categorical
-//! This module assumes 
+//! This module assumes
 
 use crate::math::num::RealNumber;
 
 pub type CategoricalFloat = u16;
 
 // pub struct CategoricalFloat(u16);
+const ERROR_MARGIN: f64 = 0.001;
 
 pub trait Categorizable: RealNumber {
     type A;
@@ -13,11 +14,9 @@ pub trait Categorizable: RealNumber {
     fn to_category(self) -> CategoricalFloat;
 
     fn is_valid(self) -> bool;
-
 }
 
 impl Categorizable for f32 {
-
     type A = CategoricalFloat;
 
     fn to_category(self) -> CategoricalFloat {
@@ -26,20 +25,19 @@ impl Categorizable for f32 {
 
     fn is_valid(self) -> bool {
         let a = self.to_category();
-        a as f32 == self
+        (a as f32 - self).abs() < (ERROR_MARGIN as f32)
     }
 }
 
 impl Categorizable for f64 {
-
     type A = CategoricalFloat;
 
-    fn to_category(self) ->CategoricalFloat {
+    fn to_category(self) -> CategoricalFloat {
         self as CategoricalFloat
     }
 
     fn is_valid(self) -> bool {
         let a = self.to_category();
-        a as f64 == self
+        (a as f64 - self).abs() < ERROR_MARGIN
     }
-}
\ No newline at end of file
+}
diff --git a/src/preprocessing/mod.rs b/src/preprocessing/mod.rs
index c07b982..4a1abf3 100644
--- a/src/preprocessing/mod.rs
+++ b/src/preprocessing/mod.rs
@@ -1,5 +1,5 @@
 /// Transform a data matrix by replaceing all categorical variables with their one-hot vector equivalents
-pub mod categorical_encoders;
+pub mod categorical_encoder;
 mod data_traits;
 /// Encode a series (column, array) of categorical variables as one-hot vectors
 pub mod series_encoder;
diff --git a/src/preprocessing/series_encoder.rs b/src/preprocessing/series_encoder.rs
index 321f049..438d678 100644
--- a/src/preprocessing/series_encoder.rs
+++ b/src/preprocessing/series_encoder.rs
@@ -65,6 +65,7 @@ pub fn make_one_hot<T: RealNumber, V: BaseVector<T>>(
 /// println!("{:?}", enc_lv.get_categories());
 /// assert_eq!(enc_lv.transform_one::<f64>(&"dog"), enc_lm.transform_one::<f64>(&"dog"))
 /// ```
+#[derive(Debug, Clone)]
 pub struct SeriesOneHotEncoder<CategoryType> {
     category_map: HashMap<CategoryType, usize>,
     categories: Vec<CategoryType>,
@@ -134,7 +135,7 @@ impl<'a, CategoryType: 'a + Hash + Eq + Clone> SeriesOneHotEncoder<CategoryType>
         &self,
         categories: &'a [CategoryType],
     ) -> Vec<Option<Vec<U>>> {
-        let v = categories.iter().map(|a| a.clone());
+        let v = categories.iter().cloned();
         self.transform_iter(v)
     }