code: def test_custom_init(self):
      with chainer.using_config("dtype", "float16"):
          array = self._generate_array(numpy)
      self.assertEqual("float16", array.dtype)
  
imports: import os
  import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import initializers
  from chainer import testing
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 3 for calling the TestGenerateArray obj's underlying member method code with example usage: obj.test_custom_init() without return types