If your game window is very easily frozen but the training is still running, the solution is here.

[hcchengithub]

If your game window is very easily frozen but the training is still running, the solution is here.
Wrapped Game Code\tetris_fun.py needs to add one line as shown below,

... snip ...
	def frame_step(self,input):
		# add this line 
		pygame.event.pump()
	
		self.movingLeft = False
		self.movingRight = False
... snip ...

Thanks to LeoLiu8023Am at
http://www.icourse163.org/learn/BIT-1001872001?tid=1001965001#/learn/forumdetail?pid=1003592809