When I run...
pipeline_output = make_pipeline()
factor_data = run_pipeline(pipeline_output, '2009-02-25', '2019-02-25')
factor_data_subset = factor_data.loc['2019-02-25':'2019-02-25', :]
I get the following error pop up, but it doesn't stop the backtest or pipeline from running.
2009-02-25 07:45 WARN numpy/lib/nanfunctions.py:1202: RuntimeWarning: Degrees of freedom <= 0 for slice.
But it shows up every time I run_pipeline. Can anyone shed some light on what this error means?
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