code: def difference_of_restricted_mean_survival_time_test(
      model1, model2, t
  ):
      pass
  
imports: from itertools import combinations
  import warnings
  import numpy
  from scipy import stats
  import pandas
  from lifelines import utils
  from lifelines.utils import group_survival_table_from_events, string_rjustify, format_p_value, format_floats, interpolate_at_times_and_return_pandas, _expected_value_of_survival_up_to_t, _expected_value_of_survival_squared_up_to_t
  from lifelines import KaplanMeierFitter
label_desc: Use image node_id 6 for calling a global function with example usage: difference_of_restricted_mean_survival_time_test(model1, model2, t) without return types