<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _set_dense_defaults_and_eval(kwargs):
 """ Sets default values in kwargs if kwargs are not already given. Evaluates all values using eval Parameters kwargs : dict Dictionary of dense specific keyword args Returns ------- : dict Default, evaluated dictionary """


    kwargs['delimiter'] = kwargs.get('delimiter', ',')
    kwargs['na_values'] = kwargs.get('na_values', '')
    kwargs['nan_to_zero'] = kwargs.get('nan_to_zero', False)
    kwargs['drop_na'] = kwargs.get('drop_na', False)
    kwargs['label_col'] = kwargs.get('label_col', 'label')
    kwargs['count_col'] = kwargs.get('count_col', 'count')

    for key, val in kwargs.iteritems():
        try:
            kwargs[key] = eval(val)
        except:
            kwargs[key] = val

    return kwargs