diff --git a/m1_tf_test.py b/m1_tf_test.py
index 03dd641..ce63bf8 100644
--- a/m1_tf_test.py
+++ b/m1_tf_test.py
@@ -26,7 +26,7 @@ class ComputeSum(Layer):
       self.total.assign_add(tf.reduce_sum(inputs, axis=0))
       return self.total
 
-    def Build_Tree(self, data, depth = 0):
+  def call(self, data, depth = 0):
         n = len(data)
         return n
 
@@ -92,7 +92,7 @@ model.compile(optimizer='adam',
  loss=loss_fn,
  metrics=['accuracy'])
 these = model.fit(x_train, y_train, epochs=10)
-that = ComputeSum.Build_Tree(these)
+that = ComputeSum(len(these))
 those = that(these)
 outputs = tf.keras.layers.Dense(4, activation='softmax', name='predictions')(those)
 model = ComputeSumModel((tf.shape(these)[1],))