diff --git a/src/core/data/matrix.rs b/src/core/data/matrix.rs
index da114ba..f50ffd7 100644
--- a/src/core/data/matrix.rs
+++ b/src/core/data/matrix.rs
@@ -227,6 +227,13 @@ impl ops::Div<&Matrix> for Matrix{
 }
 
 impl Matrix{
+    pub fn abs(&mut self) {
+        for i in 0..self.rows{
+            for j in 0..self.columns{
+                self.data[i][j] = self.data[i][j].abs();
+            }
+        }
+    }
     pub fn clip(&mut self, clip_range: &Range<f32>){
         for i in 0..self.rows {
             for j in 0..self.columns {
diff --git a/src/core/layer/methods/errors.rs b/src/core/layer/methods/errors.rs
index 719414d..6ca816e 100644
--- a/src/core/layer/methods/errors.rs
+++ b/src/core/layer/methods/errors.rs
@@ -12,7 +12,10 @@ impl ErrorTypes{
             ErrorTypes::MeanAbsolute => {
                 let actual_matrix = Matrix::from(actual.to_param_2d());
                 let expected_matrix = Matrix::from(expected.to_param_2d());
-                Box::new((actual_matrix - &expected_matrix).transpose())
+
+                let res = (actual_matrix - &expected_matrix).transpose();
+
+                Box::new(res)
             },
             ErrorTypes::MeanSquared => {
                 let actual_matrix = Matrix::from(actual.to_param_2d());