code: def test_univariate(self):
      self._check_algorithm(
          func=lambda x: (x[0] - 20) ** 2,
          start_point=[100.0],
          expected_argmin=[20.0],
      )
  
imports: 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 the ConjugateGradientTest obj's underlying member method code with example usage: obj.test_univariate() without return types