Set base_score in Learning API Python

Hi, can anyone tell me how to set base_score in learning API?
I know in scikit-learn API use param base_score to set initial prediction
but can i set in learning API too?
cause in this issue https://github.com/dmlc/xgboost/issues/799 set to mean of target value increase speed of training data

params['base_score'] = 0.5
xgboost.train(params, ...)
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