diff --git a/read_cifar.py b/read_cifar.py
index 75954c0da929f019018a35d0eab7260e166c5d4d..f657c0392876393867a7f3158deee4b81a7a272b 100644
--- a/read_cifar.py
+++ b/read_cifar.py
@@ -29,13 +29,13 @@ def read_cifar(directory_path):
     for i in range(len(files)):
         fichier=directory_path+files[i]
         data_dict=unpickle(fichier)
-        M=data_dict[b'data']
+        D=data_dict[b'data']
         L=data_dict[b'labels']
         L=np.array(L)
-        data=np.vstack((X,M))
-        labels=np.hstack((Y,L))
-    data=X[N:2*N,]
-    labels=Y[A:,]
+        data=np.vstack((data,D))
+        labels=np.hstack((labels,L))
+    data=data[N:2*N,]
+    labels=labels[A:,]
     return data,labels
 
 def split_dataset(data,labels,split):