<s> from numpy import fromiter , int32 <EOL> from arsenal . alphabet import Alphabet <EOL> from crf import CRF <EOL> class StringCRF ( CRF ) : <EOL> """<STR_LIT>""" <EOL> def __init__ ( self , label_alphabet , feature_alphabet ) : <EOL> self . label_alphabet = label_alphabet <EOL> self . feature_alphabet = feature_alphabet <EOL> CRF . __init__ ( self , len ( self . label_alphabet ) , len ( self . feature_alphabet ) ) <EOL> def __call__ ( self , x ) : <EOL> return self . label_alphabet . lookup_many ( CRF . __call__ ( self , x ) ) <EOL> def preprocess ( self , data ) : <EOL> """<STR_LIT>""" <EOL> A = self . feature_alphabet . map <EOL> L = self . label_alphabet <EOL> for x in data : <EOL> if x . feature_table is None : <EOL> x . feature_table = f = { } <EOL> F = x . F <EOL> for i , y in L . enum ( ) : <EOL> f [ <NUM_LIT:0> , None , i ] = fromiter ( A ( F ( <NUM_LIT:0> , None , y ) ) , dtype = int32 ) <EOL> for t in xrange ( <NUM_LIT:1> , x . N ) : <EOL> for j , y in L . enum ( ) : <EOL> for i , yp in L . enum ( ) : <EOL> f [ t , i , j ] = fromiter ( A ( F ( t , yp , y ) ) , dtype = int32 ) <EOL> if x . target_features is None : <EOL> x . target_features = self . path_features ( x , list ( L . map ( x . truth ) ) ) <EOL> def build_domain ( data ) : <EOL> """<STR_LIT>""" <EOL> L = Alphabet ( ) <EOL> A = Alphabet ( ) <EOL> for x in data : <EOL> L . add_many ( x . truth ) <EOL> F = x . F <EOL> path = x . truth <EOL> A . add_many ( F ( <NUM_LIT:0> , None , path [ <NUM_LIT:0> ] ) ) <EOL> A . add_many ( k for t in xrange ( <NUM_LIT:1> , x . N ) for k in F ( t , path [ t - <NUM_LIT:1> ] , path [ t ] ) ) <EOL> L . freeze ( ) <EOL> A . stop_growth ( ) <EOL> return ( L , A ) <EOL> class Instance ( object ) : <EOL> def __init__ ( self , s , truth = None ) : <EOL> self . sequence = list ( s ) <EOL> self . truth = truth <EOL> self . N = len ( s ) <EOL> self . feature_table = None <EOL> self . target_features = None <EOL> def F ( self , t , yp , y ) : <EOL> """<STR_LIT>""" <EOL> for f in self . sequence [ t ] . attributes : <EOL> yield '<STR_LIT>' % ( y , f ) <EOL> yield '<STR_LIT>' % y <EOL> yield '<STR_LIT>' % ( yp , y ) </s>
