diff --git a/cerebros/units/units.py b/cerebros/units/units.py
index 890d500..6641834 100644
--- a/cerebros/units/units.py
+++ b/cerebros/units/units.py
@@ -83,8 +83,13 @@ def __init__(self,
                  train_data_dtype=tf.float32,
                  *args,
                  **kwargs):
-
-        self.input_shape = input_shape
+        if isinstance(input_shape, int):
+            self.input_shape = (input_shape,)
+        elif isinstance(input_shape, str):
+            self.input_shape = (int(input_shape),)
+        else
+            _input_shape = [int(ax) for ax in input_shape]
+            self.input_shape = tuple(_input_shape)
         self.neural_network_layer = []
         self.base_models = base_models
         self.train_data_dtype = train_data_dtype
@@ -100,7 +105,7 @@ def __init__(self,
 
     def materialize(self):
 
-        self.raw_input = tf.keras.layers.Input(int(self.input_shape),
+        self.raw_input = tf.keras.layers.Input(self.input_shape,
                                                name=f"{self.name}_inp",
                                                dtype=self.train_data_dtype)
         print(f"$$$$$$>>>>> Base model: {self.base_models[self.unit_id]}")