Source code for fonduer.features.models.feature

from sqlalchemy import Column, Float
from sqlalchemy.dialects import postgresql

from fonduer.meta import Meta
from fonduer.utils.models.annotation import AnnotationKeyMixin, AnnotationMixin


[docs]class FeatureKey(AnnotationKeyMixin, Meta.Base): # type: ignore """A feature's key that identifies the definition of the Feature.""" pass
[docs]class Feature(AnnotationMixin, Meta.Base): # type: ignore """An element of a representation of a Candidate in a feature space. A Feature's annotation key identifies the definition of the Feature, e.g., a function that implements it or the library name and feature name in an automatic featurization library. """ #: A list of floating point values for each Key. values = Column(postgresql.ARRAY(Float), nullable=False)