demo bug fix, plotting works

demos/regression.py

@@ -3,7 +3,7 @@ import numpy as np
 import matplotlib.pyplot as plt
 import torch
 import supr
-from tspn.utils import drawnow, arrange_figs
+from supr.utils import drawnow
 from scipy.stats import norm
 
 #%% Dataset

supr/utils.py

@@ -9,6 +9,7 @@ from PyQt5 import QtWidgets
 
 # %%
 def drawnow():
+    plt.show(block=False)
     plt.gcf().canvas.draw()
     plt.gcf().canvas.flush_events()