diff options
Diffstat (limited to 'decoder/ff.h')
| -rw-r--r-- | decoder/ff.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/decoder/ff.h b/decoder/ff.h index 3280592e..afa3dbca 100644 --- a/decoder/ff.h +++ b/decoder/ff.h @@ -17,11 +17,17 @@ class FeatureFunction { friend class ExternalFeature; public: std::string name_; // set by FF factory using usage() - FeatureFunction() : state_size_() {} - explicit FeatureFunction(int state_size) : state_size_(state_size) {} + FeatureFunction() : state_size_(), ignored_state_size_() {} + explicit FeatureFunction(int state_size, int ignored_state_size = 0) + : state_size_(state_size), ignored_state_size_(ignored_state_size) {} virtual ~FeatureFunction(); bool IsStateful() const { return state_size_ > 0; } int StateSize() const { return state_size_; } + // Returns the number of bytes in the state that should be ignored during + // search. When non-zero, the last N bytes in the state should be ignored when + // splitting a hypernode by the state. This allows the feature function to + // store some side data and later retrieve it via the state bytes. + int IgnoredStateSize() const { return ignored_state_size_; } // override this. not virtual because we want to expose this to factory template for help before creating a FF static std::string usage(bool show_params,bool show_details) { @@ -71,12 +77,17 @@ class FeatureFunction { SparseVector<double>* estimated_features, void* context) const; - // !!! ONLY call this from subclass *CONSTRUCTORS* !!! + // !!! ONLY call these from subclass *CONSTRUCTORS* !!! void SetStateSize(size_t state_size) { state_size_ = state_size; } + + void SetIgnoredStateSize(size_t ignored_state_size) { + ignored_state_size_ = ignored_state_size; + } + private: - int state_size_; + int state_size_, ignored_state_size_; }; #endif |