code: def test_himmelblau_batch_all(self):
      self._check_algorithm(
          func=_himmelblau,
          start_point=[[1, 1], [-2, 2], [-1, -1], [1, -2]],
          expected_argmin=[
              [3, 2],
              [-2.805118, 3.131312],
              [-3.779310, -3.283186],
              [3.584428, -1.848126],
          ],
          gtol=1e-8,
      )
  
imports: import numpy
  import tensorflow.compat.v2
  import tf_quant_finance
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 16 for calling the ConjugateGradientTest obj's underlying member method code with example usage: obj.test_himmelblau_batch_all() without return types