有大佬在ubuntu20.04 用jupyter notebook 使用多线程并行优化cta回测，报错Uncaught exception in zmqstream callback， ValueError: Duplicate Signature: b'*'，windows没有这个问题，研究了一下，应该是jupyter 使用multiprocessing 导致的问题。暂时没找到解决办法。
具体报错：
[E 21:25:39.983 NotebookApp] Exception in callback functools.partial(<function ZMQStream._update_handler.<locals>.<lambda> at 0x7f90d499a5e0>)
Traceback (most recent call last):
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/tornado/ioloop.py", line 741, in _run_callback
ret = callback()
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/zmq/eventloop/zmqstream.py", line 548, in <lambda>
self.io_loop.add_callback(lambda : self._handle_events(self.socket, 0))
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/zmq/eventloop/zmqstream.py", line 462, in _handle_events
self._handle_recv()
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/zmq/eventloop/zmqstream.py", line 492, in _handle_recv
self._run_callback(callback, msg)
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/zmq/eventloop/zmqstream.py", line 444, in _run_callback
callback(args, kwargs)
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/zmq/eventloop/zmqstream.py", line 203, in <lambda>
self.on_recv(lambda msg: callback(self, msg), copy=copy)
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/notebook/services/kernels/handlers.py", line 442, in _on_zmq_reply
msg = self.session.deserialize(fed_msg_list)
File "/home/ubuntu/programs/anaconda3/lib/python3.8/site-packages/jupyter_client/session.py", line 923, in deserialize
raise ValueError("Duplicate Signature: %r" % signature)
ValueError: Duplicate Signature: b'b495da5b0364e1cbe145a514d1b547029e141e5e9ad9054944de573b5239434e'
