code: def load_transactions(input_file, **kwargs):
      
      delimiter = kwargs.get('delimiter', '\t')
      for transaction in csv.reader(input_file, delimiter=delimiter):
          yield transaction if transaction else ['']
docs: Load transactions and returns a generator for transactions.
  
      Arguments:
          input_file -- An input file.
  
      Keyword arguments:
          delimiter -- The delimiter of the transaction.