Safe Haskell	None
Language	Haskell98

Data.CRF.Chain2.Tiers.DAG.Feature

Contents

Feature
Featre extraction
- Present features
- Hidden features
Feature selection
Indexing

Description

Feature extraction module for DAG-aware CRFs.

Synopsis

data Feat
- = TFeat3 {
  - x1 :: !Lb
  - x2 :: !Lb
  - x3 :: !Lb
  - ln :: !Int
  }
- | TFeat2 {
  - x1 :: !Lb
  - x2 :: !Lb
  - ln :: !Int
  }
- | TFeat1 {
  - x1 :: !Lb
  - ln :: !Int
  }
- | OFeat {
  - ob :: !Ob
  - x1 :: !Lb
  - ln :: !Int
  }
presentFeats :: DAG a (X, Y) -> [(Feat, LogFloat)]
data EdgeIx = EdgeIx {
- edgeID :: !EdgeID
- lbIx :: !CbIx
}
hiddenFeats :: DAG a X -> [Feat]
obFeatsOn :: DAG a X -> EdgeIx -> [Feat]
trFeatsOn :: DAG a X -> Maybe EdgeIx -> Maybe EdgeIx -> Maybe EdgeIx -> [Feat]
type FeatSel a = DAG a (X, Y) -> [Feat]
selectPresent :: FeatSel a
selectHidden :: FeatSel a
lbNum :: DAG a X -> EdgeID -> Int
lbIxs :: DAG a X -> EdgeID -> [CbIx]
edgeIxs :: DAG a X -> EdgeID -> [EdgeIx]
prevEdgeIxs :: DAG a X -> Maybe EdgeID -> [Maybe EdgeIx]
nextEdgeIxs :: DAG a X -> Maybe EdgeID -> [Maybe EdgeIx]
initialEdgeIxs :: DAG a X -> [EdgeIx]
finalEdgeIxs :: DAG a X -> [EdgeIx]

Feature

data Feat Source #

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 Source #
Instance details Defined in Data.CRF.Chain2.Tiers.Core Methods (==) :: Feat -> Feat -> Bool # (/=) :: Feat -> Feat -> Bool #
Ord Feat Source #
Instance details 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 Source #
Instance details Defined in Data.CRF.Chain2.Tiers.Core Methods showsPrec :: Int -> Feat -> ShowS # show :: Feat -> String # showList :: [Feat] -> ShowS #
Binary Feat Source #
Instance details Defined in Data.CRF.Chain2.Tiers.Core Methods put :: Feat -> Put # get :: Get Feat # putList :: [Feat] -> Put #

Featre extraction

Present features

presentFeats :: DAG a (X, Y) -> [(Feat, LogFloat)] Source #

Present Features of all kinds occurring in the given DAG.

Hidden features

data EdgeIx Source #

Edge with the corresponding label index.

Constructors

EdgeIx
Fields edgeID :: !EdgeID ID of an edge lbIx :: !CbIx Index of the corresponding complex label

Instances

Eq EdgeIx Source #
Instance details Defined in Data.CRF.Chain2.Tiers.DAG.Feature Methods (==) :: EdgeIx -> EdgeIx -> Bool # (/=) :: EdgeIx -> EdgeIx -> Bool #
Ord EdgeIx Source #
Instance details Defined in Data.CRF.Chain2.Tiers.DAG.Feature Methods compare :: EdgeIx -> EdgeIx -> Ordering # (<) :: EdgeIx -> EdgeIx -> Bool # (<=) :: EdgeIx -> EdgeIx -> Bool # (>) :: EdgeIx -> EdgeIx -> Bool # (>=) :: EdgeIx -> EdgeIx -> Bool # max :: EdgeIx -> EdgeIx -> EdgeIx # min :: EdgeIx -> EdgeIx -> EdgeIx #
Show EdgeIx Source #
Instance details Defined in Data.CRF.Chain2.Tiers.DAG.Feature Methods showsPrec :: Int -> EdgeIx -> ShowS # show :: EdgeIx -> String # showList :: [EdgeIx] -> ShowS #

hiddenFeats :: DAG a X -> [Feat] Source #

Features hidden in the dataset element.

obFeatsOn :: DAG a X -> EdgeIx -> [Feat] Source #

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

trFeatsOn Source #

Arguments

:: DAG a X
-> Maybe EdgeIx	Current EdgeIx
-> Maybe EdgeIx	Previous EdgeIx
-> Maybe EdgeIx	One before the previous EdgeIx
-> [Feat]

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

Feature selection

type FeatSel a = DAG a (X, Y) -> [Feat] Source #

A feature selection function type.

selectPresent :: FeatSel a Source #

The presentFeats adapted to fit feature selection specs.

selectHidden :: FeatSel a Source #

The hiddenFeats adapted to fit feature selection specs.

Indexing

lbNum :: DAG a X -> EdgeID -> Int Source #

Number of potential labels at the given position of the sentence.

lbIxs :: DAG a X -> EdgeID -> [CbIx] Source #

List of label indices at the given edge.

edgeIxs :: DAG a X -> EdgeID -> [EdgeIx] Source #

The list of EdgeIx's corresponding to the given edge.

prevEdgeIxs :: DAG a X -> Maybe EdgeID -> [Maybe EdgeIx] Source #

The list of EdgeIx's corresponding to the previous edges. If the argument edgeID is Nothing or if the list of previous edges is empty, the result will be a singleton list containing Nothing (which represents a special out-of-bounds EdgeIx).

nextEdgeIxs :: DAG a X -> Maybe EdgeID -> [Maybe EdgeIx] Source #

Similar to prevEdgeIxs but returns the succeeding edges.

initialEdgeIxs :: DAG a X -> [EdgeIx] Source #

Obtain the list of initial EdgeIxs.

finalEdgeIxs :: DAG a X -> [EdgeIx] Source #

Obtain the list of final EdgeIxs.