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Prefixer

Prepends a prefix on features names.

Parameters

  • prefix

    Type → str

Examples

from river import compose

x = {'a': 42, 'b': 12}
compose.Prefixer('prefix_').transform_one(x)

{'prefix_a': 42, 'prefix_b': 12}

Methods

learn_one

Update with a set of features x.

A lot of transformers don't actually have to do anything during the learn_one step because they are stateless. For this reason the default behavior of this function is to do nothing. Transformers that however do something during the learn_one can override this method.

Parameters

  • x — 'dict'

Returns

Transformer: self

transform_one

Transform a set of features x.

Parameters

  • x — 'dict'

Returns

dict: The transformed values.