old_contents: from rsk_mind.datasource import CSVDatasource
  
  datasource = CSVDatasource('in.csv')
  dataset = datasource.read()
  dataset.setTransformer(1)
  dataset.applyTransformations()
  datasource = CSVDatasource('out.csv')
  datasource.write(dataset)
  
new_contents: from rsk_mind.datasource import CSVDatasource
  
  datasource = CSVDatasource('in.csv')
  dataset = datasource.read()
  dataset.applyTransformations()
  datasource = CSVDatasource('out.csv')
  datasource.write(dataset)
  
subject: Load source dataset and save transformed dataset