code: def test_in1d_char_array(self):
      a = np.array(["a", "b", "c", "d", "e", "c", "e", "b"])
      b = np.array(["a", "c"])
  
      ec = np.array(
          [True, False, True, False, False, True, False, False]
      )
      c = in1d(a, b)
  
      assert_array_equal(c, ec)
  
imports: import numpy
  from numpy.testing import assert_array_equal, assert_equal, assert_raises, assert_raises_regex
  from numpy.lib.arraysetops import ediff1d, intersect1d, setxor1d, union1d, setdiff1d, unique, in1d, isin
  import pytest
label_desc: Use image node_id 10 for calling the TestSetOps obj's underlying member method code with example usage: obj.test_in1d_char_array() without return types