Commits on Apr 4, 2024

1. Use stable sort when sorting values in forecaster …

   When Prophet prepares a dataframe for fitting or predicting,
   it runs a sort on the `ds` column.
   
   This changes the sort algorithm from the pandas default sort
   to mergesort, which is a stable sort.
   
   This is important in situations where multiple regressors
   are present and so the fitted dataframe is not unique by date.
   
   Users may do something like the following:
   
   ```.py
   df = <some dataframe>
   
   m = Prophet()
   m.add_regressor('x')
   m.fit(df)
   
   predict_df = m.predict(df)
   df['prediction'] = predict_df['yhat']
   ```
   
   In `m.predict(df)`, there is a call to `df.sort_values('ds')`.
   As this is not a stable sort, sometimes the `x` column above
   can get switched around, even if `df` is sorted. A stable sort
   addresses this.

   

   natl committed Apr 4, 2024
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