re-add np.int64 support for classic PAM

Author: kno10

kmedoids/__init__.py

@@ -362,6 +362,8 @@ def pam(diss, medoids, max_iter=100, init="build", random_state=None):
 			return KMedoidsResult(*_pam_swap_f64(diss, medoids.astype(np.uint64), max_iter))
 		elif dtype == np.int32:
 			return KMedoidsResult(*_pam_swap_i32(diss, medoids.astype(np.uint64), max_iter))
+		elif dtype == np.int64:
+			return KMedoidsResult(*_pam_swap_i64(diss, medoids.astype(np.uint64), max_iter))
 	raise ValueError("Input data not supported. Use a numpy array of floats.")
 
 def pammedsil(diss, medoids, max_iter=100, init="build", random_state=None):