moved titration ratio function to web code

tiger.py

@@ -124,6 +124,10 @@ def prediction_transform(predictions: np.array, **params):
     return 1 - predictions
 
 
+def titration_ratio(guide: np.array, parent: np.array):
+    return 1 - np.clip(parent - guide, a_min=0.01, a_max=0.99)
+
+
 def predict_on_target(transcript_seq: str, model: tf.keras.Model):
 
     # parse transcript sequence