Strategies

strategy	The base class for tuning strategy.
basic	The basic tuning strategy.
mse	MSE tuning strategy.
mse_v2	The MSE_V2 tuning strategy.
hawq_v2	The HAWQ_V2 tuning strategy.
bayesian	The Bayesian tuning strategy.
exhaustive	The exhaustive tuning strategy.
random	The random tuning strategy.