Cerebro 中可通过optdata 和 optreturn 两个参数来提升参数优化模式下的运行效率；同时多线程运行能比上述两种参数模式提供更好的效率提升。
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optdatas (default: True)
If True and optimizing (and the system can preload and use runonce, data preloading will be done only once in the main process to save time and resources. -
optreturn (default: True)
If True the optimization results will not be full Strategy objects (and all datas, indicators, observers …) but and object with the following attributes (same as in Strategy):-
params (or p) the strategy had for the execution
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analyzers the strategy has executed
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