code: def setUp(self):
      np.random.seed(123269)
      self.n_nodes = 3
      self.n_realizations = 2
  
      self.events = [
          [
              np.cumsum(np.random.rand(4 + i))
              for i in range(self.n_nodes)
          ]
          for _ in range(self.n_realizations)
      ]
  
imports: import unittest
  import numpy
  from tick.hawkes.inference import HawkesEM
  from tick.hawkes.model.tests.model_hawkes_test_utils import hawkes_intensities, hawkes_log_likelihood
  from tick.hawkes import SimuHawkes, HawkesKernelTimeFunc, HawkesKernelExp, SimuHawkesExpKernels
  from tick.base import TimeFunction
label_desc: Use image node_id 1 for calling the Test obj's underlying member method code with example usage: obj.setUp() without return types