启动bert-server报错TypeError: cannot unpack non-iterable NoneType object

I:VENTILATOR:[__i:__i: 67]:freeze, optimize and export graph, could take a while…
E:GRAPHOPT:[gra:opt:154]:fail to optimize the graph!
Traceback (most recent call last):
File “/usr/local/lib/python3.7/site-packages/bert_serving/server/graph.py”, line 42, in optimize_graph
tf = import_tf(verbose=args.verbose)
File “/usr/local/lib/python3.7/site-packages/bert_serving/server/helper.py”, line 186, in import_tf
tf.logging.set_verbosity(tf.logging.DEBUG if verbose else tf.logging.ERROR)
AttributeError: module ‘tensorflow’ has no attribute ‘logging’
Traceback (most recent call last):
File “/usr/local/bin/bert-serving-start”, line 10, in
sys.exit(main())
File “/usr/local/lib/python3.7/site-packages/bert_serving/server/cli/init.py”, line 4, in main
with BertServer(get_run_args()) as server:
File “/usr/local/lib/python3.7/site-packages/bert_serving/server/init.py”, line 71, in init
self.graph_path, self.bert_config = pool.apply(optimize_graph, (self.args,))
TypeError: cannot unpack non-iterable NoneType object

查了一圈，是因为tensorflow版本太高，我装的2.0的版本，换成1.15就好了

You should install TensorFlow >= 1.10 and <=1.15
1

参考
https://github.com/jina-ai/clip-as-service/issues/522