code: def coxph_concordance_and_baseline():
      rossi = load_rossi()
  
      without_strata(rossi)
      with_strata(rossi)
  
file_path: h2o-3/h2o-py/tests/testdir_algos/coxph/pyunit_coxph_concordance_survival.py
imports: import sys
  import h2o
  from lifelines import CoxPHFitter
  from lifelines.datasets import load_rossi
  from pandas.testing import assert_frame_equal
  from tests import pyunit_utils
  from h2o.estimators.coxph import H2OCoxProportionalHazardsEstimator
label_desc: Use image node_id 1 for calling a global function with example usage: coxph_concordance_and_baseline() without return types