fixing ci

4 jobs for beta in 36 minutes and 43 seconds
Name Stage Failure
failed
test Test
  A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

See the caveats in the documentation: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy
df['value'] = transformations[transformation](df['value'])

-- Docs: http://doc.pytest.org/en/latest/warnings.html
======== 9 failed, 247 passed, 10 skipped, 8 warnings in 100.21 seconds ========
ERROR: Job failed: exit code 4