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+from libcpp.string cimport string
+from libcpp.vector cimport vector
+from utils cimport WordID
+
+cdef extern from "decoder/hg.h":
+ cdef cppclass Hypergraph:
+ Hypergraph(Hypergraph)
+
+cdef extern from "decoder/viterbi.h":
+ cdef string ViterbiESentence(Hypergraph hg, vector[WordID]* trans)