/* Copyright (C) 1997, 1998, 1999 Andrew McCallum   Written by:  Andrew Kachites McCallum <mccallum@cs.cmu.edu>   This file is part of the Bag-Of-Words Library, `libbow'.   This library is free software; you can redistribute it and/or   modify it under the terms of the GNU Library General Public License   as published by the Free Software Foundation, version 2.      This library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Library General Public License for more details.   You should have received a copy of the GNU Library General Public   License along with this library; if not, write to the Free Software   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA */#ifndef __BOW_EM_H#define __BOW_EM_H/* The method and parameters of EM weight settings. */extern rainbow_method bow_method_em;typedef enum {  bow_em_perturb_none = 0,  bow_em_perturb_with_gaussian,  bow_em_perturb_with_dirichlet} bow_em_perturb_method;extern bow_em_perturb_method bow_em_perturb_starting_point;extern int bow_em_num_em_runs;extern int em_cross_entropy;/* hack for scoring for perplexity calculation */extern int bow_em_calculating_perplexity;typedef struct _bow_em_pr_struct {  double score;  int correct;} bow_em_pr_struct;voidbow_em_perturb_weights (bow_barrel *doc_barrel, bow_barrel *vpc_barrel);intbow_em_pr_struct_compare (const void *x, const void *y);voidbow_em_compare_to_nb (bow_barrel *doc_barrel);voidbow_em_print_log_odds_ratio (bow_barrel *barrel, int num_to_print);/* Set the class prior probabilities by counting the number of   documents of each class. note this counts all train and unlabeled   docs.  Note that we're doing an m-estimate thing-y by starting   out as one doc each per class. */void bow_em_set_priors_using_class_probs (bow_barrel *vpc_barrel,					  bow_barrel *doc_barrel);#endif /* __BOW_EM_H */