TPOT will, on occasion, randomly fail

[ardunn]

For example:

Traceback (most recent call last):
  File "/global/scratch/ardunn/python/lib/python3.7/site-packages/fireworks/core/rocket.py", line 262, in run
    m_action = t.run_task(my_spec)
  File "/global/scratch/ardunn/codes/hmprivate/hmprivate/automatminer/benchmarking/tasks.py", line 107, in run_task
    results = pipe.benchmark(df, target, kfold, fold_subset=[fold])
  File "/global/scratch/ardunn/codes/automatminer/automatminer/utils/package_tools.py", line 76, in wrapper
    result = func(*args, **kwargs)
  File "/global/scratch/ardunn/codes/automatminer/automatminer/pipeline.py", line 234, in benchmark
    self.fit(train, target)
  File "/global/scratch/ardunn/codes/automatminer/automatminer/utils/package_tools.py", line 76, in wrapper
    result = func(*args, **kwargs)
  File "/global/scratch/ardunn/codes/automatminer/automatminer/pipeline.py", line 137, in fit
    self.learner.fit(df, target)
  File "/global/scratch/ardunn/codes/automatminer/automatminer/utils/package_tools.py", line 76, in wrapper
    result = func(*args, **kwargs)
  File "/global/scratch/ardunn/codes/automatminer/automatminer/automl/adaptors.py", line 125, in fit
    self._backend = self._backend.fit(X, y, **fit_kwargs)
  File "/global/scratch/ardunn/python/lib/python3.7/site-packages/tpot/base.py", line 693, in fit
    raise e
  File "/global/scratch/ardunn/python/lib/python3.7/site-packages/tpot/base.py", line 684, in fit
    self._update_top_pipeline()
  File "/global/scratch/ardunn/python/lib/python3.7/site-packages/tpot/base.py", line 758, in _update_top_pipeline
    raise RuntimeError('A pipeline has not yet been optimized. Please call fit() first.')
RuntimeError: A pipeline has not yet been optimized. Please call fit() first.

This happens infrequently enough for it to not be code-breaking, but frequently enough for it to be annyoing.