fiftyone.core.service.DatabaseService failed to bind to or

Hi guys,

I hope you are doing great

🐛 Bug

If I import Trainer

from flash import Trainer

I got the following error:

{"t":{"$date":"2021-08-05T07:47:51.890Z"},"s":"I",  "c":"CONTROL",  "id":20697,   "ctx":"main","msg":"Renamed existing log file","attr":{"oldLogPath":"/home/zuppif/.fiftyone/var/lib/mongo/log/mongo.log","newLogPath":"/home/zuppif/.fiftyone/var/lib/mongo/log/mongo.log.2021-08-05T07-47-51"}}
Subprocess ['/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/db/bin/mongod', '--dbpath', '/home/zuppif/.fiftyone/var/lib/mongo', '--logpath', '/home/zuppif/.fiftyone/var/lib/mongo/log/mongo.log', '--port', '0', '--nounixsocket'] exited with error 100:
Uncaught exception
Traceback (most recent call last):
  File "/home/zuppif/gust-torchvision/playground.py", line 7, in <module>
    from flash import Trainer
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/flash/__init__.py", line 23, in <module>
    from flash.core.data.data_module import DataModule  # noqa: E402
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/flash/core/data/data_module.py", line 30, in <module>
    from flash.core.data.data_pipeline import DataPipeline, DefaultPreprocess, Postprocess, Preprocess
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/flash/core/data/data_pipeline.py", line 27, in <module>
    from flash.core.data.batch import _DeserializeProcessor, _Postprocessor, _Preprocessor, _Sequential, _SerializeProcessor
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/flash/core/data/batch.py", line 22, in <module>
    from flash.core.data.data_source import DefaultDataKeys
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/flash/core/data/data_source.py", line 47, in <module>
    from fiftyone.core.collections import SampleCollection
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/__init__.py", line 25, in <module>
    from fiftyone.__public__ import *
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/__public__.py", line 11, in <module>
    _database_service = fos.DatabaseService()
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/core/service.py", line 203, in __init__
    super().__init__()
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/core/service.py", line 81, in __init__
    self.start()
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/core/service.py", line 293, in start
    food.set_default_port(self.port)
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/core/service.py", line 283, in port
    return self._wait_for_child_port()
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/core/service.py", line 180, in _wait_for_child_port
    return find_port()
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/retrying.py", line 49, in wrapped_f
    return Retrying(*dargs, **dkw).call(f, *args, **kw)
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/retrying.py", line 212, in call
    raise attempt.get()
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/retrying.py", line 247, in get
    six.reraise(self.value[0], self.value[1], self.value[2])
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/six.py", line 719, in reraise
    raise value
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/retrying.py", line 200, in call
    attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
  File "/home/zuppif/gust-torchvision/venv/lib/python3.8/site-packages/fiftyone/core/service.py", line 178, in find_port
    raise ServiceListenTimeout(etau.get_class_name(self), port)
fiftyone.core.service.ServiceListenTimeout: fiftyone.core.service.DatabaseService failed to bind to or