[isort] add matplotlib to known 3rd party dependencies (#4800)

examples/benchmarking/plot_csv_file.py

@@ -3,9 +3,9 @@ from collections import defaultdict
 from dataclasses import dataclass, field
 from typing import Optional
 
+import matplotlib.pyplot as plt
 import numpy as np
 
-import matplotlib.pyplot as plt
 from transformers import HfArgumentParser
 
 

setup.cfg

@@ -9,6 +9,7 @@ known_third_party =
     fastprogress
     git
     h5py
+    matplotlib
     MeCab
     nltk
     numpy