Adds type hint for normalize_values function

1 files changed, 2 insertions, 1 deletions

diff --git a/gn3/computations/correlations.py b/gn3/computations/correlations.py
index d38946e..37c70e9 100644
--- a/gn3/computations/correlations.py
+++ b/gn3/computations/correlations.py
@@ -3,6 +3,7 @@ import math
 import multiprocessing
 from contextlib import closing
 
+from typing import Generator
 from typing import List
 from typing import Tuple
 from typing import Optional
@@ -38,7 +39,7 @@ def map_shared_keys_to_values(target_sample_keys: List,
     return target_dataset_data
 
 
-def normalize_values(a_values: List, b_values: List):
+def normalize_values(a_values: List, b_values: List) -> Tuple[Generator, Generator]:
     """
     :param a_values: list of primary strain values
     :param b_values: a list of target strain values