Preprocess.py throws SettingWithCopyWarning

[stefanDeveloper]

Running preprocess.py results in the following warning:

./src/data/preprocess.py:91: SettingWithCopyWarning: 
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/user_guide/indexing.html#returning-a-view-versus-a-copy
  mila_other_views_df['label'] = 0                                       # Mila images with alternative diagnoses
./src/data/preprocess.py:92: SettingWithCopyWarning: 
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/user_guide/indexing.html#returning-a-view-versus-a-copy
  fig1_covid_views_df['label'] = 1                                       # Figure 1 images with COVID-19 diagnosis