code: def test_hawkes_cumulants_tf_solve_l1(self):
      self._test_hawkes_cumulants_solve(
          Learner=HawkesCumulantMatchingTf,
          max_iter=8000,
          step=1e-5,
          solver="adam",
          penalty="l1",
          C=1e-6,
          tol=1e-16,
          R_significance_threshold=1.5e-0,  # relative magnitudes of R effectively not tested
          # relative magnitudes of baseline effectively not tested
          baseline_significance_threshold=1e-3,
          adjacency_significance_threshold=1.25e-6,
          significance_band_width=9e4,
      )
  
imports: import os
  import pickle
  import unittest
  import numpy
  from tick.base.inference import InferenceTest
  from tick.hawkes import HawkesCumulantMatching, HawkesCumulantMatchingTf, HawkesCumulantMatchingPyT
  from tick.hawkes.inference.hawkes_cumulant_matching import HawkesTheoreticalCumulant
label_desc: Use image node_id 8 for calling the Test obj's underlying member method code with example usage: obj.test_hawkes_cumulants_tf_solve_l1() without return types