Data.CRF.Chain2.Tiers.Feature

Feature

data Feat

Feature; every feature is associated to a layer with ln identifier.

Constructors

TFeat3

Second-order transition feature.

Fields

• x1 :: !Lb
• x2 :: !Lb
• x3 :: !Lb
• ln :: !Int

TFeat2

First-order transition feature.

Fields

• x1 :: !Lb
• x2 :: !Lb
• ln :: !Int

TFeat1

Zero-order transition feature.

Fields

• x1 :: !Lb
• ln :: !Int

OFeat

Observation feature.

Fields

• ob :: !Ob
• x1 :: !Lb
• ln :: !Int

Instances

Eq Feat

Defined in Data.CRF.Chain2.Tiers.Core

Methods

(==) :: Feat -> Feat -> Bool

(/=) :: Feat -> Feat -> Bool

Ord Feat

Defined in Data.CRF.Chain2.Tiers.Core

Methods

compare :: Feat -> Feat -> Ordering

(<) :: Feat -> Feat -> Bool

(<=) :: Feat -> Feat -> Bool

(>) :: Feat -> Feat -> Bool

(>=) :: Feat -> Feat -> Bool

max :: Feat -> Feat -> Feat

min :: Feat -> Feat -> Feat

Show Feat

Defined in Data.CRF.Chain2.Tiers.Core

Methods

showsPrec :: Int -> Feat -> ShowS

show :: Feat -> String

showList :: [Feat] -> ShowS

Binary Feat

Defined in Data.CRF.Chain2.Tiers.Core

Methods

put :: Feat -> Put

get :: Get Feat

putList :: [Feat] -> Put

Feature extraction

presentFeats :: Xs -> Ys -> [(Feat, LogFloat)]

Features present in the dataset element together with corresponding occurence probabilities.

hiddenFeats :: Xs -> [Feat]

Features hidden in the dataset element.

obFeatsOn :: Xs -> Int -> CbIx -> [Feat]

Observation features on a given position and with respect to a given label (determined by index).

trFeatsOn :: Xs -> Int -> CbIx -> CbIx -> CbIx -> [Feat]

Transition features on a given position and with respect to a given labels (determined by indexes).

Feature selection

type FeatSel = Xs -> Ys -> [Feat]

A feature selection function type.

selectPresent :: FeatSel

The presentFeats adapted to fit feature selection specs.

selectHidden :: FeatSel

The hiddenFeats adapted to fit feature selection specs.