Fixed indentation issue

model.py

@@ -69,14 +69,14 @@ kl_weight = tf.keras.backend.variable(0.125)
 
 
 class VAECost:
-    """
-    VAE cost with a schedule based on the Microsoft Research Blog's article
-    "Less pain, more gain: A simple method for VAE training with less of that KL-vanishing agony"
+  """
+  VAE cost with a schedule based on the Microsoft Research Blog's article
+  "Less pain, more gain: A simple method for VAE training with less of that KL-vanishing agony"
     
-    The KL weight increases linearly, until it meets a certain threshold and keeps constant
-    for the same number of epochs. After that, it decreases abruptly to zero again, and the
-    cycle repeats.
-    """
+  The KL weight increases linearly, until it meets a certain threshold and keeps constant
+  for the same number of epochs. After that, it decreases abruptly to zero again, and the
+  cycle repeats.
+  """
 
   def __init__(self, model):
     self.model = model