code: def _zero_boundary(t, locations):
      del t, locations
      return 0
  
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  import tf_quant_finance
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 2 for calling a global function with example usage: _zero_boundary(t, locations) and returns: int