1 | /**************************************************************************
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2 | *
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3 | * mg_weights_build.c -- Program to build the document weights file
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4 | * Copyright (C) 1994 Neil Sharman
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5 | *
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6 | * This program is free software; you can redistribute it and/or modify
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7 | * it under the terms of the GNU General Public License as published by
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8 | * the Free Software Foundation; either version 2 of the License, or
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9 | * (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | *
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20 | * $Id: mg_weights_build.c 7400 2004-05-24 21:12:18Z kjdon $
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21 | *
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22 | **************************************************************************/
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23 |
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24 | #include "sysfuncs.h"
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25 | #include "memlib.h"
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26 | #include "messages.h"
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27 | #include "local_strings.h"
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28 | #include "bitio_gen.h"
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29 | #include "bitio_m.h"
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30 | #include "bitio_m_stdio.h"
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31 | #include "timing.h"
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32 | #include "netorder.h" /* [RPAP - Jan 97: Endian Ordering] */
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33 |
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34 | #include "mg_files.h"
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35 | #include "locallib.h"
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36 | #include "invf.h"
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37 | #include "text.h"
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38 | #include "words.h"
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39 |
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40 | #define MAXBITS (sizeof(unsigned long) * 8)
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41 |
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42 | /*
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43 | $Log$
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44 | Revision 1.2 2004/05/24 21:12:18 kjdon
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45 | changed a message
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46 |
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47 | Revision 1.1 2003/02/20 21:18:24 mdewsnip
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48 | Addition of MG package for search and retrieval
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49 |
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50 | Revision 1.1 1999/08/10 21:18:16 sjboddie
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51 | renamed mg-1.3d directory mg
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52 |
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53 | Revision 1.2 1998/11/25 07:55:49 rjmcnab
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54 |
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55 | Modified mg to that you can specify the stemmer you want
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56 | to use via a command line option. You specify it to
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57 | mg_passes during the build process. The number of the
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58 | stemmer that you used is stored within the inverted
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59 | dictionary header and the stemmed dictionary header so
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60 | the correct stemmer is used in later stages of building
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61 | and querying.
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62 |
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63 | Revision 1.1 1998/11/17 09:35:22 rjmcnab
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64 | *** empty log message ***
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65 |
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66 | * Revision 1.4 1994/11/29 00:32:05 tes
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67 | * Committing the new merged files and changes.
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68 | *
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69 | * Revision 1.3 1994/10/20 03:57:00 tes
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70 | * I have rewritten the boolean query optimiser and abstracted out the
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71 | * components of the boolean query.
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72 | *
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73 | * Revision 1.2 1994/09/20 04:41:55 tes
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74 | * For version 1.1
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75 | *
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76 | */
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77 |
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78 | static char *RCSID = "$Id: mg_weights_build.c 7400 2004-05-24 21:12:18Z kjdon $";
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79 |
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80 | unsigned char bits = 8;
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81 | static char *file_name = "";
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82 | static char *text_file_name = "";
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83 | static unsigned long NumPara = 0;
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84 | static unsigned long StaticNumOfDocs = 0;
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85 |
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86 | unsigned long get_NumPara (void);
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87 | unsigned long get_StaticNumOfDocs (void);
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88 | void GenerateWeights (void);
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89 | void Make_weight_approx (void);
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90 | void Make_text_idx_wgt (void);
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91 |
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92 |
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93 | int main (int argc, char **argv)
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94 | {
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95 | ProgTime StartTime;
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96 | int ch;
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97 | opterr = 0;
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98 | msg_prefix = argv[0];
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99 | while ((ch = getopt (argc, argv, "f:t:d:b:sh")) != -1) /* [RJM 10/98 - Text Filename] */
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100 | switch (ch)
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101 | {
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102 | case 'f': /* input file */
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103 | file_name = optarg;
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104 | if (strlen(text_file_name) == 0) text_file_name = optarg;
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105 | break;
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106 | /* [RJM 10/98 - Text Filename] */
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107 | case 't': /* text input file */
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108 | text_file_name = optarg;
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109 | break;
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110 | case 'd':
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111 | set_basepath (optarg);
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112 | break;
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113 | case 'b':
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114 | bits = atoi (optarg);
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115 | if (bits > 32)
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116 | {
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117 | fprintf (stderr, "b may only take values 0-32\n");
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118 | exit (1);
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119 | }
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120 | break;
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121 | case 'h':
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122 | case '?':
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123 | fprintf (stderr, "usage: %s [-f input_file]"
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124 | "[-d data directory] [-b bits] [-s] [-h]\n", argv[0]);
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125 | exit (1);
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126 | }
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127 | GetTime (&StartTime);
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128 |
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129 | GenerateWeights ();
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130 |
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131 | Make_weight_approx ();
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132 |
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133 | Make_text_idx_wgt ();
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134 |
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135 | Message ("%s", ElapsedTime (&StartTime, NULL));
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136 |
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137 | return 0;
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138 | }
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139 |
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140 |
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141 |
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142 |
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143 | unsigned long
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144 | get_NumPara (void)
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145 | {
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146 | struct invf_dict_header idh;
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147 | FILE *invf_dict;
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148 | if (NumPara)
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149 | return (NumPara);
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150 | invf_dict = open_file (file_name, INVF_DICT_SUFFIX, "rb", MAGIC_STEM_BUILD,
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151 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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152 | fread ((char *) &idh, sizeof (idh), 1, invf_dict);
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153 | fclose (invf_dict);
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154 | NTOHUL2(idh.num_of_docs, NumPara); /* [RPAP - Jan 97: Endian Ordering] */
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155 | return NumPara;
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156 | }
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157 |
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158 |
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159 |
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160 | unsigned long
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161 | get_StaticNumOfDocs (void)
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162 | /* the static number of documents is the N parameter used to
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163 | * decode document gaps in the inverted file encoded using
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164 | * the Bblock method.
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165 | */
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166 | {
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167 | struct invf_dict_header idh;
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168 | FILE *invf_dict;
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169 | if (StaticNumOfDocs)
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170 | return (StaticNumOfDocs);
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171 | invf_dict = open_file (file_name, INVF_DICT_SUFFIX, "rb", MAGIC_STEM_BUILD,
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172 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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173 | fread ((char *) &idh, sizeof (idh), 1, invf_dict);
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174 | fclose (invf_dict);
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175 | NTOHUL2(idh.static_num_of_docs, StaticNumOfDocs); /* [RPAP - Jan 97: Endian Ordering] */
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176 | return StaticNumOfDocs;
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177 | }
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178 |
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179 |
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180 |
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181 | void GenerateWeights (void) {
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182 | FILE *dict, *invf, *f, *idx;
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183 | struct invf_dict_header idh;
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184 | struct invf_file_header ifh;
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185 | int i;
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186 | double logN;
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187 | float *DocWeights;
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188 |
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189 | /* make sure the globals NumPara and StaticNumOfDocs are loaded */
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190 | get_NumPara ();
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191 | get_StaticNumOfDocs ();
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192 |
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193 | /* check to see if the weights file has already been built */
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194 | if ((f = open_file (file_name, WEIGHTS_SUFFIX, "rb", MAGIC_WGHT,
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195 | MG_CONTINUE)) != NULL) {
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196 | fclose (f);
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197 | return;
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198 | }
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199 | Message ("The file \"%s.weight\" does not exist.", file_name);
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200 | Message ("Building the weight data from the file \"%s.invf\".", file_name);
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201 |
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202 | logN = log ((double) NumPara);
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203 |
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204 | /* allocate memory for the weights */
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205 | if (!(DocWeights = Xmalloc (sizeof (float) * (NumPara + 1))))
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206 | FatalError (1, "No memory for doc weights");
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207 | bzero ((char *) DocWeights, sizeof (float) * (NumPara + 1));
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208 |
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209 | /* open the .invf.dict file and read in its header */
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210 | dict = open_file (file_name, INVF_DICT_SUFFIX, "rb", MAGIC_STEM_BUILD,
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211 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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212 | fread ((char *) &idh, sizeof (idh), 1, dict);
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213 |
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214 | /* [RPAP - Jan 97: Endian Ordering] */
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215 | NTOHUL(idh.lookback);
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216 | NTOHUL(idh.dict_size);
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217 | NTOHUL(idh.total_bytes);
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218 | NTOHUL(idh.index_string_bytes);
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219 | NTOHD(idh.input_bytes); /* [RJM 07/97: 4G limit] */
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220 | NTOHUL(idh.num_of_docs);
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221 | NTOHUL(idh.static_num_of_docs);
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222 | NTOHUL(idh.num_of_words);
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223 | NTOHUL(idh.stemmer_num);
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224 | NTOHUL(idh.stem_method);
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225 |
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226 | /* open .invf.idx */
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227 | idx = open_file (file_name, INVF_IDX_SUFFIX, "rb", MAGIC_INVI,
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228 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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229 |
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230 | /* open .invf and read in its header */
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231 | invf = open_file (file_name, INVF_SUFFIX, "rb", MAGIC_INVF,
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232 | MG_ABORT);
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233 | fread ((char *) &ifh, sizeof (ifh), 1, invf);
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234 |
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235 | /* [RPAP - Jan 97: Endian Ordering] */
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236 | NTOHUL(ifh.no_of_words);
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237 | NTOHUL(ifh.no_of_ptrs);
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238 | NTOHUL(ifh.skip_mode);
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239 | for (i = 0; i <= 15; i++)
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240 | NTOHUL(ifh.params[i]);
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241 | NTOHUL(ifh.InvfLevel);
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242 |
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243 | /* make sure the inverted file does not contain skips and is not level 1 */
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244 | if (ifh.skip_mode != 0)
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245 | FatalError (0, "Can\'t make weights file from a skipped inverted file.");
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246 | if (ifh.InvfLevel == 1)
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247 | FatalError (0, "Can\'t make weights file from level 1 inverted file.");
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248 |
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249 | DECODE_START (invf)
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250 |
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251 | /* process each word adding its contributions to the document weights */
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252 | for (i = 0; i < ifh.no_of_words; i++)
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253 | {
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254 | u_char dummy1, dummy2[MAXSTEMLEN + 1];
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255 | unsigned long fcnt, wcnt, blk, CurrDoc, p, j;
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256 | float idf;
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257 |
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258 | /* give a little feedback every 4096 words */
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259 | if ((i & 0xfff) == 0)
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260 | fprintf (stderr, ".");
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261 |
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262 | /* read an entry for a word, just to get p value */
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263 | dummy1 = fgetc (dict);
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264 | dummy1 = fgetc (dict);
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265 | fread (dummy2, sizeof (u_char), dummy1, dict);
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266 | fread ((char *) &fcnt, sizeof (fcnt), 1, dict);
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267 | fread ((char *) &wcnt, sizeof (wcnt), 1, dict);
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268 |
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269 | dummy2[dummy1] = '\0';
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270 |
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271 | /* [RPAP - Jan 97: Endian Ordering] */
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272 | NTOHUL(fcnt);
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273 | NTOHUL(wcnt);
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274 |
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275 | p = fcnt;
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276 |
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277 | idf = logN - log ((double) fcnt);
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278 | blk = BIO_Bblock_Init (StaticNumOfDocs, p);
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279 | CurrDoc = 0;
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280 |
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281 | /* check the inverted file index entry for this word */
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282 | {
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283 | unsigned long loc;
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284 | fread ((char *) &loc, sizeof (loc), 1, idx);
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285 | NTOHUL(loc); /* [RPAP - Jan 97: Endian Ordering] */
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286 | if (ftell (invf) != loc)
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287 | {
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288 | FatalError (1, "Word %d %d != %d", i, ftell (invf), loc);
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289 | }
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290 | }
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291 |
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292 | for (j = 0; j < p; j++)
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293 | {
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294 | unsigned long x, tf;
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295 | BBLOCK_DECODE (x, blk);
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296 | CurrDoc += x;
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297 |
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298 | if (CurrDoc > idh.num_of_docs) {
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299 | FatalError (1, "CurrDoc = %d, number of documents = %d",
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300 | CurrDoc, idh.num_of_docs);
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301 | }
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302 |
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303 | if (ifh.InvfLevel >= 2)
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304 | {
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305 | double weight;
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306 | GAMMA_DECODE (tf);
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307 | weight = tf * idf;
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308 | DocWeights[CurrDoc - 1] += weight * weight;
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309 | }
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310 | }
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311 |
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312 | while (__btg)
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313 | DECODE_BIT;
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314 | }
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315 |
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316 | DECODE_DONE
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317 |
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318 | fclose (dict);
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319 | fclose (invf);
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320 | fprintf (stderr, "\n");
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321 |
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322 | /* [RPAP - Jan 97: Endian Ordering] */
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323 | for (i = 0; i < NumPara; i++)
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324 | HTONF(DocWeights[i]);
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325 |
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326 | f = create_file (file_name, WEIGHTS_SUFFIX, "wb", MAGIC_WGHT,
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327 | MG_ABORT);
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328 |
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329 | fwrite ((char *) DocWeights, sizeof (float), NumPara, f);
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330 | fclose (f);
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331 | Xfree (DocWeights);
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332 | }
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333 |
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334 |
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335 |
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336 |
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337 |
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338 |
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339 |
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340 |
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341 |
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342 |
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343 |
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344 | void
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345 | Make_weight_approx (void)
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346 | {
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347 | int i, pos, max;
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348 | unsigned long buf;
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349 | double U, L, B;
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350 | FILE *approx, *exact;
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351 |
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352 | exact = open_file (file_name, WEIGHTS_SUFFIX, "rb", MAGIC_WGHT,
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353 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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354 |
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355 | /* calculate U and L */
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356 | L = 1e300;
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357 | U = 0;
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358 | for (i = 0; i < NumPara; i++)
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359 | {
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360 | float wgt;
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361 | fread ((char *) &wgt, sizeof (wgt), 1, exact);
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362 | NTOHF(wgt); /* [RPAP - Jan 97: Endian Ordering] */
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363 | wgt = sqrt (wgt);
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364 | if (wgt > U)
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365 | U = wgt;
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366 | if (wgt > 0 && wgt < L)
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367 | L = wgt;
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368 |
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369 | }
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370 | fseek (exact, sizeof (u_long), SEEK_SET);
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371 |
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372 | B = pow (U / L, pow (2.0, -(double) bits));
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373 |
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374 | fprintf (stderr, "L = %f\n", L);
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375 | fprintf (stderr, "U = %f\n", U);
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376 | fprintf (stderr, "B = %f\n", B);
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377 |
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378 |
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379 |
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380 | approx = create_file (file_name, APPROX_WEIGHTS_SUFFIX, "wb",
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381 | MAGIC_WGHT_APPROX, MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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382 |
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383 | fwrite ((char *) &bits, sizeof (bits), 1, approx);
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384 | HTOND(L); /* [RPAP - Jan 97: Endian Ordering] */
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385 | HTOND(B); /* [RPAP - Jan 97: Endian Ordering] */
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386 | fwrite ((char *) &L, sizeof (L), 1, approx);
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387 | fwrite ((char *) &B, sizeof (B), 1, approx);
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388 | NTOHD(L); /* [RPAP - Jan 97: Endian Ordering] */
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389 | NTOHD(B); /* [RPAP - Jan 97: Endian Ordering] */
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390 |
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391 | max = bits == 32 ? 0xffffffff : (1 << bits) - 1;
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392 | for (buf = pos = i = 0; i < NumPara; i++)
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393 | {
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394 | unsigned long fx;
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395 | float wgt;
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396 | fread ((char *) &wgt, sizeof (wgt), 1, exact);
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397 | NTOHF(wgt); /* [RPAP - Jan 97: Endian Ordering] */
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398 | wgt = sqrt (wgt);
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399 | if (wgt == 0)
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400 | {
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401 | wgt = L;
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402 | #ifndef QUIET
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403 | Message ("Warning: Document %d had a weight of 0.", i);
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404 | #endif
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405 | }
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406 | fx = (int) floor (log (wgt / L) / log (B));
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407 |
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408 | if (fx > max)
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409 | fx = max;
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410 |
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411 | buf |= (fx << pos);
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412 | pos += bits;
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413 |
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414 | if (pos >= MAXBITS)
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415 | {
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416 | HTONUL(buf);
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417 | fwrite ((char *) &buf, sizeof (buf), 1, approx);
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418 | buf = fx >> (bits - (pos - MAXBITS));
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419 | pos = pos - MAXBITS;
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420 | }
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421 | }
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422 | if (pos > 0)
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423 | {
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424 | /* [RPAP - Jan 97: Endian Ordering] */
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425 | HTONUL(buf);
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426 | fwrite ((char *) &buf, sizeof (buf), 1, approx);
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427 | }
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428 |
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429 | fclose (approx);
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430 | fclose (exact);
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431 | }
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432 |
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433 |
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434 |
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435 |
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436 |
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437 | void
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438 | Make_text_idx_wgt (void)
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439 | {
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440 | compressed_text_header cth;
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441 | int i;
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442 | FILE *idx_wgt, *idx, *para, *exact;
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443 |
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444 | idx_wgt = create_file (file_name, TEXT_IDX_WGT_SUFFIX, "wb", MAGIC_TEXI_WGT,
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445 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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446 |
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447 | /* [RJM 10/98 - Text Filename] */
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448 | idx = open_file (text_file_name, TEXT_IDX_SUFFIX, "rb", MAGIC_TEXI,
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449 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
|
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450 | if (fread (&cth, sizeof (cth), 1, idx) != 1)
|
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451 | FatalError (1, "Unable to read header of index file");
|
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452 |
|
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453 | /* [RPAP - Jan 97: Endian Ordering] */
|
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454 | NTOHUL(cth.num_of_docs);
|
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455 | NTOHD(cth.num_of_bytes); /* [RJM 07/97: 4G limit] */
|
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456 | NTOHUL(cth.num_of_words);
|
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457 | NTOHUL(cth.length_of_longest_doc);
|
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458 | NTOHD(cth.ratio);
|
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459 |
|
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460 | exact = open_file (file_name, WEIGHTS_SUFFIX, "rb", MAGIC_WGHT,
|
---|
461 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
|
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462 |
|
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463 | get_NumPara ();
|
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464 | if (cth.num_of_docs != NumPara)
|
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465 | {
|
---|
466 | Message ("The number of documents %d does not equal "
|
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467 | "the number of paragraphs %d.", cth.num_of_docs, NumPara);
|
---|
468 | Message ("Using the \"%s.invf.paragraph\" file\n", file_name);
|
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469 | para = open_file (file_name, INVF_PARAGRAPH_SUFFIX, "rb", MAGIC_PARAGRAPH,
|
---|
470 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
471 | }
|
---|
472 | else
|
---|
473 | para = NULL;
|
---|
474 |
|
---|
475 | {
|
---|
476 | struct
|
---|
477 | {
|
---|
478 | unsigned long Start;
|
---|
479 | float Weight;
|
---|
480 | }
|
---|
481 | data;
|
---|
482 | for (i = 0; i < cth.num_of_docs; i++)
|
---|
483 | {
|
---|
484 | int count;
|
---|
485 | fread ((char *) &data.Start, sizeof (unsigned long), 1, idx);
|
---|
486 | if (para && i < cth.num_of_docs)
|
---|
487 | {
|
---|
488 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
489 | fread ((char *) &count, sizeof (count), 1, para);
|
---|
490 | NTOHSI(count);
|
---|
491 | }
|
---|
492 | else
|
---|
493 | count = 1;
|
---|
494 | while (count--)
|
---|
495 | {
|
---|
496 | fread ((char *) &data.Weight, sizeof (float), 1, exact);
|
---|
497 | NTOHF(data.Weight); /* [RPAP - Jan 97: Endian Ordering] */
|
---|
498 | data.Weight = sqrt (data.Weight);
|
---|
499 | HTONF(data.Weight); /* [RPAP - Jan 97: Endian Ordering] */
|
---|
500 | fwrite ((char *) &data, sizeof (data), 1, idx_wgt);
|
---|
501 | }
|
---|
502 | }
|
---|
503 | /* Write out the extra entry for the idx file */
|
---|
504 | fread ((char *) &data.Start, sizeof (unsigned long), 1, idx);
|
---|
505 | data.Weight = 0;
|
---|
506 | fwrite((char*)&data, sizeof(data), 1, idx_wgt);
|
---|
507 | }
|
---|
508 |
|
---|
509 | fclose (idx_wgt);
|
---|
510 | fclose (idx);
|
---|
511 | fclose (exact);
|
---|
512 | if (para)
|
---|
513 | fclose (para);
|
---|
514 | }
|
---|