def __virtual__():
    return __virtualname__ if HAS_WHOOSH else False
Solve the optimization problem by policy iteration. See the
dataset/ETHPy150Open saltstack/salt/salt/search/whoosh_search.py/__virtual__--crossover with--dataset/ETHPy150Open QuantEcon/QuantEcon.py/quantecon/markov/ddp.py/DiscreteDP.policy_iteration