docstr: Test calling odeint with y(t) values that are pytrees.
docstr_tok: ["Test","calling","odeint","with","y","(","t",")","values","that","are","pytrees","."]
code: def test_pytree_state(self):
      """Test calling odeint with y(t) values that are pytrees."""
  
      def dynamics(y, _t):
          return tree_map(jnp.negative, y)
  
      y0 = (np.array(-0.1), np.array([[[0.1]]]))
      ts = np.linspace(0.0, 1.0, 11)
      tol = 1e-1 if jtu.num_float_bits(np.float64) == 32 else 1e-3
  
      integrate = partial(odeint, dynamics)
      jtu.check_grads(
          integrate,
          (y0, ts),
          modes=["rev"],
          order=2,
          atol=tol,
          rtol=tol,
      )
  
imports: from functools import partial
  from absl.testing import absltest
  import numpy
  import jax
  from jax._src import test_util
  import jax.numpy
  from jax.experimental.ode import odeint
  from jax.tree_util import tree_map
  import scipy.integrate
  from jax import config
label_desc: Use image node_id 3 for calling the ODETest obj's underlying member method code with example usage: obj.test_pytree_state() and returns: tree_map