Move hardcorded data to a constants module

src/model.py

@@ -1,8 +1,10 @@
 from tensorflow.keras import Model, Sequential, layers
 from tensorflow.keras.regularizers import l2
 
+from constants import BASES
 
-def build_model(hyper_parameters, bases="ACGT") -> Model:
+
+def build_model(hyper_parameters) -> Model:
     """
     Builds the CNN model
     """
@@ -39,6 +41,6 @@ def build_model(hyper_parameters, bases="ACGT") -> Model:
             ),
             layers.Dropout(rate=0.3),
             # Output layer with softmax activation
-            layers.Dense(units=len(bases), activation="softmax"),
+            layers.Dense(units=len(BASES), activation="softmax"),
         ]
     )