update alpaca gpt4 to use dataset entry

[CloseChoice]

#2827

Update alpaca gpt4 to use dataset entry.

I ran

~$ python check_dataset_appearances.py -d alpaca_gpt4 --cache_dir .cache --mode sft
'Found the following occurances in TRAIN alpaca_gpt4:'
{   re.compile('\\[\\d+(?:,\\s*\\d+)*?\\]'): [   '[3, 45, 99, 2, 8, 6, 72]',
                                                 '[10, 8, 7, 4]',
                                                 '[1, 2, 3, 4, 5]',
                                                 '[7, 3, 4, 6, 2]']}
'Found the following occurances in VAL alpaca_gpt4:'
{   'openai': [   'u’re approved, get your API key.\n'
                  '\n'
                  '2. Install the `openai` library in your Python environment '
                  'using p']}

Checked all the occurances for the references, but all are programming related and have nothing to do with references, so this looks fine:

DatasetEntry(questions=['Re-order the integer list given in the input field such that 
                                         all odd numbers are first and even numbers are last.
                                         \n[2, 3, 8, 45, 6, 99, 72]'], 
                      answers=['[3, 45, 99, 2, 8, 6, 72]'],
                      context=None, 
                      lang=None, 
                      length=None, 
                      quality=None, 
                      humor=None, 
                      creativity=None)

[andreaskoepf]

ok .. nice!