Traceback (most recent call last):


 "/home/ubuntu/ray/python/ray/worker.py", line 1694, in fetch_and_execute_function_to_run

function = pickle.loads(serialized_function)


 "/home/ubuntu/ray/python/ray/tune/registry.py", line 12, in <module>

from ray.tune.trainable import Trainable, wrap_function


 "/home/ubuntu/ray/python/ray/tune/__init__.py", line 6, in <module>

from ray.tune.tune import run_experiments


 "/home/ubuntu/ray/python/ray/tune/tune.py", line 8, in <module>

from ray.tune.hyperband import HyperBandScheduler


 "/home/ubuntu/ray/python/ray/tune/hyperband.py", line 8, in <module>

from ray.tune.trial_scheduler import FIFOScheduler, TrialScheduler


 "/home/ubuntu/ray/python/ray/tune/trial_scheduler.py", line 5, in <module>

from ray.tune.trial import Trial


 "/home/ubuntu/ray/python/ray/tune/trial.py", line 15, in <module>

from ray.tune.registry import _default_registry, get_registry, TRAINABLE_CLASS
ImportError: cannot import name '_default_registry'

Traceback (most recent call last):


 "/home/spott/.local/venvs/pipsi/bin/pip", line 7, in <module>

from pip import main


 "/home/spott/.local/venvs/pipsi/lib/python3.6/site-packages/pip/__init__.py", line 28, in <module>

from pip.vcs import git, mercurial, subversion, bazaar
# noqa


 "/home/spott/.local/venvs/pipsi/lib/python3.6/site-packages/pip/vcs/mercurial.py", line 9, in <module>

from pip.download import path_to_url


 "/home/spott/.local/venvs/pipsi/lib/python3.6/site-packages/pip/download.py", line 36, in <module>

from pip.utils.glibc import libc_ver


 "/home/spott/.local/venvs/pipsi/lib/python3.6/site-packages/pip/utils/glibc.py", line 4, in <module>

import ctypes


 "/usr/lib/python3.6/ctypes/__init__.py", line 7, in <module>

from _ctypes import Union, Structure, Array
ImportError: /home/spott/.local/venvs/pipsi/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _PyUnicode_AsWideCharString
