code: def test_rosenbock_7d(self):
      self._check_algorithm(
          func=_rosenbrock,
          start_point=np.zeros(7),
          expected_argmin=np.ones(7),
      )
  
imports: import numpy
  import tensorflow.compat.v2
  import tf_quant_finance
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 9 for calling the ConjugateGradientTest obj's underlying member method code with example usage: obj.test_rosenbock_7d() without return types