ZGen::ShiftReduce::Decoder Class Reference

#include <decoder.h>

Inheritance diagram for ZGen::ShiftReduce::Decoder:

Public Types
typedef std::pair< const StateItem *, const StateItem * >	decode_result_t

Public Member Functions
	Decoder (const option_t &opts, DecodeContext *ctx, Model *model, const Knowledge::PostagConstrain *constrain)
	~Decoder ()
decode_result_t	decode (const dependency_t *input, const action_sequence_t &gold_actions)

Protected Member Functions
virtual void	get_possible_actions (const StateItem &item)=0
virtual void	config_input (const dependency_t *input)=0
void	get_possible_shift_actions (const StateItem &item, int index, word_t word, postag_t postag)

Protected Attributes
const option_t &	opts
	The options. More...
Model *	model
	The model. More...
DecodeContext *	ctx
	The decode context. More...
action_sequence_t	possible_actions
	The cached possible actions. More...
packed_score_t	packed_score
	The cached packed score for transition. More...
scored_transition_t	candidate_transitions [kMaxBeamSize]
	The candidate state tuple: (from state, action, score) More...
const Knowledge::PostagConstrain *	constraint
	The postag constraints. More...

Member Typedef Documentation

typedef std::pair<const StateItem*, const StateItem*> ZGen::ShiftReduce::Decoder::decode_result_t

Constructor & Destructor Documentation

ZGen::ShiftReduce::Decoder::Decoder	(	const option_t &	opts,
		DecodeContext *	ctx,
		Model *	model,
		const Knowledge::PostagConstrain *	constrain
	)

ZGen::ShiftReduce::Decoder::~Decoder

(

)

Member Function Documentation

virtual void ZGen::ShiftReduce::Decoder::config_input ( const dependency_t *  input )

protectedpure virtual

Config the input onto the decoder.

Parameters

[in]

input

The pointer to the input instance.

Decoder::decode_result_t ZGen::ShiftReduce::Decoder::decode	(	const dependency_t *	input,
		const action_sequence_t &	gold_actions
	)

Perform the beam-search decoding.

Parameters

[in]	input	The input dependency instance.
[in]	gold_actions	The gold transition action (only actived in the learning process).

Returns

decode_result_t The decode result.

virtual void ZGen::ShiftReduce::Decoder::get_possible_actions ( const StateItem &  item )

protectedpure virtual

Get the possible actions from the current state. Store the possible actions in the possible_actions (action_collection_t)

Parameters

[in]

item

The input item

void ZGen::ShiftReduce::Decoder::get_possible_shift_actions ( const StateItem &  item, int  index, word_t  word, postag_t  postag  )

protected

Get the possible shift action from the current state, by refering the postag constrain. The possible actions is stored in possible_actions

Parameters

[in]	item	The input state item.
[in]	index	The index.
[in]	word	The word.
[in]	postag	The postag.

Member Data Documentation

scored_transition_t ZGen::ShiftReduce::Decoder::candidate_transitions[kMaxBeamSize]

protected

The candidate state tuple: (from state, action, score)

const Knowledge::PostagConstrain* ZGen::ShiftReduce::Decoder::constraint

protected

The postag constraints.

DecodeContext* ZGen::ShiftReduce::Decoder::ctx

protected

The decode context.

Model* ZGen::ShiftReduce::Decoder::model

protected

The model.

const option_t& ZGen::ShiftReduce::Decoder::opts

protected

The options.

packed_score_t ZGen::ShiftReduce::Decoder::packed_score

protected

The cached packed score for transition.

action_sequence_t ZGen::ShiftReduce::Decoder::possible_actions

protected

The cached possible actions.

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The documentation for this class was generated from the following files:

• src/shiftreduce/decode/decoder.h
• src/shiftreduce/decode/decoder.cc