[Misc] Black auto fix. (#4679)

Co-authored-by: Steve <ubuntu@ip-172-31-34-29.ap-northeast-1.compute.internal>

examples/pytorch/stgcn_wave/sensors2graph.py

 import numpy as np
+
+
 def get_adjacency_matrix(distance_df, sensor_ids, normalized_k=0.1):
     """
     :param distance_df: data frame with three columns: [from, to, distance].