Collection < F > function ( ) { return features . keySet ( ) ; }
returns the list of features without values concode_field_sep Counter<F> features concode_elem_sep long serialVersionUID concode_elem_sep L label concode_elem_sep String id concode_field_sep Counter<F> asFeaturesCounter concode_elem_sep int hashCode concode_elem_sep double getFeatureCount concode_elem_sep boolean equals concode_elem_sep void setLabel concode_elem_sep void setID concode_elem_sep String toString concode_elem_sep L label concode_elem_sep String id concode_elem_sep Collection<L> labels