📖 Documentation

See https://qlib.readthedocs.io/en/latest/component/data.html#datahandlerlp:

In order to achieve so, Qlib provides a base class qlib.data.dataset.DataHandlerLP. The core idea of this class is that: we will have some leanable Processors which can learn the parameters of data processing(e.g., parameters for zscore normalization).
^^^^^^ learnable