Minor code improvements

Author: pavlin-policar

openTSNE/tsne.py

@@ -1,7 +1,7 @@
 import inspect
 import logging
 import multiprocessing
-from collections import Iterable
+from collections.abc import Iterable
 from types import SimpleNamespace
 from time import time
 

tests/test_tsne.py

@@ -11,7 +11,8 @@
 from sklearn.model_selection import train_test_split
 
 import openTSNE
-from openTSNE import affinity, initialization
+from openTSNE import affinity
+from openTSNE import initialization
 from openTSNE.affinity import PerplexityBasedNN
 from openTSNE.nearest_neighbors import NNDescent
 from openTSNE.tsne import kl_divergence_bh, kl_divergence_fft