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from libcpp.string cimport string
from libcpp.vector cimport vector
from utils cimport *
cimport decoder
include "vectors.pxi"
include "hypergraph.pxi"
include "lattice.pxi"
include "mteval.pxi"
SetSilent(True)
class ParseFailed(Exception): pass
cdef class Decoder:
cdef decoder.Decoder* dec
cdef DenseVector weights
def __cinit__(self, char* config):
decoder.register_feature_functions()
cdef istringstream* config_stream = new istringstream(config)
self.dec = new decoder.Decoder(config_stream)
del config_stream
self.weights = DenseVector()
self.weights.vector = &self.dec.CurrentWeightVector()
def __dealloc__(self):
del self.dec
property weights:
def __get__(self):
return self.weights
def __set__(self, weights):
if isinstance(weights, DenseVector):
self.weights.vector[0] = (<DenseVector> weights).vector[0]
elif isinstance(weights, SparseVector):
self.weights.vector.clear()
((<SparseVector> weights).vector[0]).init_vector(self.weights.vector)
elif isinstance(weights, dict):
for fname, fval in weights.items():
self.weights[fname] = fval
else:
raise TypeError('cannot initialize weights with %s' % type(weights))
def read_weights(self, cfg):
with open(cfg) as fp:
for line in fp:
fname, value = line.split()
self.weights[fname.strip()] = float(value)
def translate(self, sentence, grammar=None):
if isinstance(sentence, unicode):
inp = sentence.strip().encode('utf8')
elif isinstance(sentence, str):
inp = sentence.strip()
elif isinstance(sentence, Lattice):
inp = str(sentence) # PLF format
else:
raise TypeError('Cannot translate input type %s' % type(sentence))
if grammar:
self.dec.SetSentenceGrammarFromString(string(<char *> grammar))
cdef decoder.BasicObserver observer = decoder.BasicObserver()
self.dec.Decode(string(<char *>inp), &observer)
if observer.hypergraph == NULL:
raise ParseFailed()
cdef Hypergraph hg = Hypergraph()
hg.hg = new hypergraph.Hypergraph(observer.hypergraph[0])
return hg
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