TypeError: cannot pickle ‘_thread.lock‘ object问题

在执行milvus example时遇到如下报错：
Traceback (most recent call last):
File “/home/ygd/source2023/milvus-example/reverse_image_search/my.py”, line 91, in
.output(‘mr’)
File “/home/ygd/.local/lib/python3.10/site-packages/towhee/runtime/pipeline.py”, line 103, in output
dag_dict = deepcopy(self._dag)
File “/usr/lib/python3.10/copy.py”, line 146, in deepcopy
y = copier(x, memo)
File “/usr/lib/python3.10/copy.py”, line 231, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File “/usr/lib/python3.10/copy.py”, line 146, in deepcopy
y = copier(x, memo)
File “/usr/lib/python3.10/copy.py”, line 231, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File “/usr/lib/python3.10/copy.py”, line 146, in deepcopy
y = copier(x, memo)
File “/usr/lib/python3.10/copy.py”, line 231, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File “/usr/lib/python3.10/copy.py”, line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File “/usr/lib/python3.10/copy.py”, line 271, in _reconstruct
state = deepcopy(state, memo)
File “/usr/lib/python3.10/copy.py”, line 146, in deepcopy
y = copier(x, memo)
File “/usr/lib/python3.10/copy.py”, line 231, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File “/usr/lib/python3.10/copy.py”, line 161, in deepcopy
rv = reductor(4)
TypeError: cannot pickle ‘_thread.lock’ object
在网上查找无果，只能修改/home/ygd/.local/lib/python3.10/site-packages/towhee/runtime/pipeline.py，将deepcopy的地方修改为=进行直接赋值。从执行结果上看的确可以规避这个问题，但不知道是否有负面影响。