code: def euler_integrator(
      position: np.ndarray,
      momentum: np.ndarray,
      time_step: float,
      state_derivatives_fn: StateDerivativesFnType,
  ) -> Tuple[np.ndarray, np.ndarray]:
      """Implementation of an Euler integrator (see `abstract_integrator`)."""
      dposition_dt, dmomentum_dt = state_derivatives_fn(
          position, momentum
      )
      next_position = position + dposition_dt * time_step
      next_momentum = momentum + dmomentum_dt * time_step
      return next_position, next_momentum
  
imports: import functools
  from typing import Tuple, Callable
  from absl import app
  from frozendict import frozendict
  import jax
  import jax.numpy
  import jraph
  import matplotlib.pyplot
  import numpy
label_desc: Use image node_id 11 for calling a global function with example usage: euler_integrator(position, momentum, time_step, state_derivatives_fn) and returns: next_position,  next_momentum