add typehint

Signed-off-by: Praateek <praateekm@gmail.com>

nemo_curator/modules/fuzzy_dedup.py

@@ -122,7 +122,7 @@ def __init__(
         else:
             self._logger = logger
 
-    def generate_hash_permutations(self, n_permutations=260, seed=0):
+    def generate_hash_permutations(self, n_permutations=260, seed=0) -> np.ndarray:
         """
         Generate seeds for all minhash permutations based on the given seed.
         """