fix matplotlib to 3.1.1 to avoid python38 issues

vera121 · web-flow · commit 6630c1ea84a1 · 2022-11-25T16:56:20.000+08:00
diff --git a/python/requirements.txt b/python/requirements.txt
@@ -2,7 +2,7 @@ Cython>=0.19.2
 numpy
 scipy
 scikit-image==0.14.3
-matplotlib>=1.3.1
+matplotlib==3.1.1
 ipython>=3.0.0
 h5py>=2.2.0
 leveldb==0.20
