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 3745 2003-02-20 21:20:24Z mdewsnip $
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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 1.1 2003/02/20 21:18:24 mdewsnip
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45 | Addition of MG package for search and retrieval
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46 |
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47 | Revision 1.1 1999/08/10 21:18:16 sjboddie
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48 | renamed mg-1.3d directory mg
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49 |
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50 | Revision 1.2 1998/11/25 07:55:49 rjmcnab
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51 |
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52 | Modified mg to that you can specify the stemmer you want
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53 | to use via a command line option. You specify it to
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54 | mg_passes during the build process. The number of the
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55 | stemmer that you used is stored within the inverted
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56 | dictionary header and the stemmed dictionary header so
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57 | the correct stemmer is used in later stages of building
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58 | and querying.
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59 |
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60 | Revision 1.1 1998/11/17 09:35:22 rjmcnab
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61 | *** empty log message ***
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62 |
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63 | * Revision 1.4 1994/11/29 00:32:05 tes
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64 | * Committing the new merged files and changes.
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65 | *
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66 | * Revision 1.3 1994/10/20 03:57:00 tes
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67 | * I have rewritten the boolean query optimiser and abstracted out the
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68 | * components of the boolean query.
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69 | *
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70 | * Revision 1.2 1994/09/20 04:41:55 tes
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71 | * For version 1.1
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72 | *
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73 | */
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74 |
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75 | static char *RCSID = "$Id: mg_weights_build.c 3745 2003-02-20 21:20:24Z mdewsnip $";
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76 |
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77 | unsigned char bits = 8;
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78 | static char *file_name = "";
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79 | static char *text_file_name = "";
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80 | static unsigned long NumPara = 0;
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81 | static unsigned long StaticNumOfDocs = 0;
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82 |
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83 | unsigned long get_NumPara (void);
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84 | unsigned long get_StaticNumOfDocs (void);
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85 | void GenerateWeights (void);
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86 | void Make_weight_approx (void);
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87 | void Make_text_idx_wgt (void);
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88 |
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89 |
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90 | int main (int argc, char **argv)
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91 | {
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92 | ProgTime StartTime;
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93 | int ch;
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94 | opterr = 0;
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95 | msg_prefix = argv[0];
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96 | while ((ch = getopt (argc, argv, "f:t:d:b:sh")) != -1) /* [RJM 10/98 - Text Filename] */
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97 | switch (ch)
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98 | {
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99 | case 'f': /* input file */
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100 | file_name = optarg;
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101 | if (strlen(text_file_name) == 0) text_file_name = optarg;
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102 | break;
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103 | /* [RJM 10/98 - Text Filename] */
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104 | case 't': /* text input file */
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105 | text_file_name = optarg;
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106 | break;
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107 | case 'd':
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108 | set_basepath (optarg);
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109 | break;
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110 | case 'b':
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111 | bits = atoi (optarg);
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112 | if (bits > 32)
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113 | {
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114 | fprintf (stderr, "b may only take values 0-32\n");
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115 | exit (1);
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116 | }
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117 | break;
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118 | case 'h':
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119 | case '?':
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120 | fprintf (stderr, "usage: %s [-f input_file]"
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121 | "[-d data directory] [-b bits] [-s] [-h]\n", argv[0]);
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122 | exit (1);
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123 | }
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124 | GetTime (&StartTime);
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125 |
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126 | GenerateWeights ();
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127 |
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128 | Make_weight_approx ();
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129 |
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130 | Make_text_idx_wgt ();
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131 |
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132 | Message ("%s", ElapsedTime (&StartTime, NULL));
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133 |
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134 | return 0;
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135 | }
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136 |
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137 |
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138 |
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139 |
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140 | unsigned long
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141 | get_NumPara (void)
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142 | {
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143 | struct invf_dict_header idh;
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144 | FILE *invf_dict;
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145 | if (NumPara)
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146 | return (NumPara);
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147 | invf_dict = open_file (file_name, INVF_DICT_SUFFIX, "rb", MAGIC_STEM_BUILD,
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148 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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149 | fread ((char *) &idh, sizeof (idh), 1, invf_dict);
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150 | fclose (invf_dict);
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151 | NTOHUL2(idh.num_of_docs, NumPara); /* [RPAP - Jan 97: Endian Ordering] */
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152 | return NumPara;
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153 | }
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154 |
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155 |
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156 |
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157 | unsigned long
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158 | get_StaticNumOfDocs (void)
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159 | /* the static number of documents is the N parameter used to
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160 | * decode document gaps in the inverted file encoded using
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161 | * the Bblock method.
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162 | */
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163 | {
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164 | struct invf_dict_header idh;
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165 | FILE *invf_dict;
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166 | if (StaticNumOfDocs)
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167 | return (StaticNumOfDocs);
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168 | invf_dict = open_file (file_name, INVF_DICT_SUFFIX, "rb", MAGIC_STEM_BUILD,
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169 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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170 | fread ((char *) &idh, sizeof (idh), 1, invf_dict);
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171 | fclose (invf_dict);
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172 | NTOHUL2(idh.static_num_of_docs, StaticNumOfDocs); /* [RPAP - Jan 97: Endian Ordering] */
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173 | return StaticNumOfDocs;
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174 | }
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175 |
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176 |
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177 |
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178 | void GenerateWeights (void) {
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179 | FILE *dict, *invf, *f, *idx;
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180 | struct invf_dict_header idh;
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181 | struct invf_file_header ifh;
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182 | int i;
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183 | double logN;
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184 | float *DocWeights;
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185 |
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186 | /* make sure the globals NumPara and StaticNumOfDocs are loaded */
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187 | get_NumPara ();
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188 | get_StaticNumOfDocs ();
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189 |
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190 | /* check to see if the weights file has already been built */
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191 | if ((f = open_file (file_name, WEIGHTS_SUFFIX, "rb", MAGIC_WGHT,
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192 | MG_CONTINUE)) != NULL) {
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193 | fclose (f);
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194 | return;
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195 | }
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196 | Message ("The file \"%s.weight\" does not exist.", file_name);
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197 | Message ("Building the weight data from the file \"%s.invf\".", file_name);
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198 |
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199 | logN = log ((double) NumPara);
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200 |
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201 | /* allocate memory for the weights */
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202 | if (!(DocWeights = Xmalloc (sizeof (float) * (NumPara + 1))))
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203 | FatalError (1, "No memory for doc weights");
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204 | bzero ((char *) DocWeights, sizeof (float) * (NumPara + 1));
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205 |
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206 | /* open the .invf.dict file and read in its header */
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207 | dict = open_file (file_name, INVF_DICT_SUFFIX, "rb", MAGIC_STEM_BUILD,
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208 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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209 | fread ((char *) &idh, sizeof (idh), 1, dict);
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210 |
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211 | /* [RPAP - Jan 97: Endian Ordering] */
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212 | NTOHUL(idh.lookback);
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213 | NTOHUL(idh.dict_size);
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214 | NTOHUL(idh.total_bytes);
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215 | NTOHUL(idh.index_string_bytes);
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216 | NTOHD(idh.input_bytes); /* [RJM 07/97: 4G limit] */
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217 | NTOHUL(idh.num_of_docs);
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218 | NTOHUL(idh.static_num_of_docs);
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219 | NTOHUL(idh.num_of_words);
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220 | NTOHUL(idh.stemmer_num);
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221 | NTOHUL(idh.stem_method);
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222 |
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223 | /* open .invf.idx */
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224 | idx = open_file (file_name, INVF_IDX_SUFFIX, "rb", MAGIC_INVI,
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225 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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226 |
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227 | /* open .invf and read in its header */
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228 | invf = open_file (file_name, INVF_SUFFIX, "rb", MAGIC_INVF,
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229 | MG_ABORT);
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230 | fread ((char *) &ifh, sizeof (ifh), 1, invf);
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231 |
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232 | /* [RPAP - Jan 97: Endian Ordering] */
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233 | NTOHUL(ifh.no_of_words);
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234 | NTOHUL(ifh.no_of_ptrs);
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235 | NTOHUL(ifh.skip_mode);
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236 | for (i = 0; i <= 15; i++)
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237 | NTOHUL(ifh.params[i]);
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238 | NTOHUL(ifh.InvfLevel);
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239 |
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240 | /* make sure the inverted file does not contain skips and is not level 1 */
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241 | if (ifh.skip_mode != 0)
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242 | FatalError (0, "Can\'t make weights file from a skipped inverted file.");
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243 | if (ifh.InvfLevel == 1)
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244 | FatalError (0, "Can\'t make weights file from level 1 inverted file.");
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245 |
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246 | DECODE_START (invf)
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247 |
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248 | /* process each word adding its contributions to the document weights */
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249 | for (i = 0; i < ifh.no_of_words; i++)
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250 | {
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251 | u_char dummy1, dummy2[MAXSTEMLEN + 1];
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252 | unsigned long fcnt, wcnt, blk, CurrDoc, p, j;
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253 | float idf;
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254 |
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255 | /* give a little feedback every 4096 words */
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256 | if ((i & 0xfff) == 0)
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257 | fprintf (stderr, ".");
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258 |
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259 | /* read an entry for a word, just to get p value */
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260 | dummy1 = fgetc (dict);
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261 | dummy1 = fgetc (dict);
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262 | fread (dummy2, sizeof (u_char), dummy1, dict);
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263 | fread ((char *) &fcnt, sizeof (fcnt), 1, dict);
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264 | fread ((char *) &wcnt, sizeof (wcnt), 1, dict);
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265 |
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266 | dummy2[dummy1] = '\0';
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267 |
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268 | /* [RPAP - Jan 97: Endian Ordering] */
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269 | NTOHUL(fcnt);
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270 | NTOHUL(wcnt);
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271 |
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272 | p = fcnt;
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273 |
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274 | idf = logN - log ((double) fcnt);
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275 | blk = BIO_Bblock_Init (StaticNumOfDocs, p);
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276 | CurrDoc = 0;
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277 |
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278 | /* check the inverted file index entry for this word */
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279 | {
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280 | unsigned long loc;
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281 | fread ((char *) &loc, sizeof (loc), 1, idx);
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282 | NTOHUL(loc); /* [RPAP - Jan 97: Endian Ordering] */
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283 | if (ftell (invf) != loc)
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284 | {
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285 | FatalError (1, "Word %d %d != %d", i, ftell (invf), loc);
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286 | }
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287 | }
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288 |
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289 | for (j = 0; j < p; j++)
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290 | {
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291 | unsigned long x, tf;
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292 | BBLOCK_DECODE (x, blk);
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293 | CurrDoc += x;
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294 |
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295 | if (CurrDoc > idh.num_of_docs) {
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296 | FatalError (1, "CurrDoc = %d, number of documents = %d",
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297 | CurrDoc, idh.num_of_docs);
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298 | }
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299 |
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300 | if (ifh.InvfLevel >= 2)
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301 | {
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302 | double weight;
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303 | GAMMA_DECODE (tf);
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304 | weight = tf * idf;
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305 | DocWeights[CurrDoc - 1] += weight * weight;
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306 | }
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307 | }
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308 |
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309 | while (__btg)
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310 | DECODE_BIT;
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311 | }
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312 |
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313 | DECODE_DONE
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314 |
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315 | fclose (dict);
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316 | fclose (invf);
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317 | fprintf (stderr, "\n");
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318 |
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319 | /* [RPAP - Jan 97: Endian Ordering] */
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320 | for (i = 0; i < NumPara; i++)
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321 | HTONF(DocWeights[i]);
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322 |
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323 | f = create_file (file_name, WEIGHTS_SUFFIX, "wb", MAGIC_WGHT,
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324 | MG_ABORT);
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325 |
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326 | fwrite ((char *) DocWeights, sizeof (float), NumPara, f);
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327 | fclose (f);
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328 | Xfree (DocWeights);
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329 | }
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330 |
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331 |
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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 | void
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342 | Make_weight_approx (void)
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343 | {
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344 | int i, pos, max;
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345 | unsigned long buf;
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346 | double U, L, B;
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347 | FILE *approx, *exact;
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348 |
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349 | exact = open_file (file_name, WEIGHTS_SUFFIX, "rb", MAGIC_WGHT,
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350 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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351 |
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352 | /* calculate U and L */
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353 | L = 1e300;
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354 | U = 0;
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355 | for (i = 0; i < NumPara; i++)
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356 | {
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357 | float wgt;
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358 | fread ((char *) &wgt, sizeof (wgt), 1, exact);
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359 | NTOHF(wgt); /* [RPAP - Jan 97: Endian Ordering] */
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360 | wgt = sqrt (wgt);
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361 | if (wgt > U)
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362 | U = wgt;
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363 | if (wgt > 0 && wgt < L)
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364 | L = wgt;
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365 |
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366 | }
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367 | fseek (exact, sizeof (u_long), SEEK_SET);
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368 |
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369 | B = pow (U / L, pow (2.0, -(double) bits));
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370 |
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371 | fprintf (stderr, "L = %f\n", L);
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372 | fprintf (stderr, "U = %f\n", U);
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373 | fprintf (stderr, "B = %f\n", B);
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374 |
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375 |
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376 |
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377 | approx = create_file (file_name, APPROX_WEIGHTS_SUFFIX, "wb",
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378 | MAGIC_WGHT_APPROX, MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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379 |
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380 | fwrite ((char *) &bits, sizeof (bits), 1, approx);
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381 | HTOND(L); /* [RPAP - Jan 97: Endian Ordering] */
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382 | HTOND(B); /* [RPAP - Jan 97: Endian Ordering] */
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383 | fwrite ((char *) &L, sizeof (L), 1, approx);
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384 | fwrite ((char *) &B, sizeof (B), 1, approx);
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385 | NTOHD(L); /* [RPAP - Jan 97: Endian Ordering] */
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386 | NTOHD(B); /* [RPAP - Jan 97: Endian Ordering] */
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387 |
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388 | max = bits == 32 ? 0xffffffff : (1 << bits) - 1;
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389 | for (buf = pos = i = 0; i < NumPara; i++)
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390 | {
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391 | unsigned long fx;
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392 | float wgt;
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393 | fread ((char *) &wgt, sizeof (wgt), 1, exact);
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394 | NTOHF(wgt); /* [RPAP - Jan 97: Endian Ordering] */
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395 | wgt = sqrt (wgt);
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396 | if (wgt == 0)
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397 | {
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398 | wgt = L;
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399 | #ifndef QUIET
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400 | Message ("Warning: Document %d had a weight of 0.", i);
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401 | #endif
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402 | }
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403 | fx = (int) floor (log (wgt / L) / log (B));
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404 |
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405 | if (fx > max)
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406 | fx = max;
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407 |
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408 | buf |= (fx << pos);
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409 | pos += bits;
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410 |
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411 | if (pos >= MAXBITS)
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412 | {
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413 | HTONUL(buf);
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414 | fwrite ((char *) &buf, sizeof (buf), 1, approx);
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415 | buf = fx >> (bits - (pos - MAXBITS));
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416 | pos = pos - MAXBITS;
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417 | }
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418 | }
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419 | if (pos > 0)
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420 | {
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421 | /* [RPAP - Jan 97: Endian Ordering] */
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422 | HTONUL(buf);
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423 | fwrite ((char *) &buf, sizeof (buf), 1, approx);
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424 | }
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425 |
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426 | fclose (approx);
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427 | fclose (exact);
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428 | }
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429 |
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430 |
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431 |
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432 |
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433 |
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434 | void
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435 | Make_text_idx_wgt (void)
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436 | {
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437 | compressed_text_header cth;
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438 | int i;
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439 | FILE *idx_wgt, *idx, *para, *exact;
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440 |
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441 | idx_wgt = create_file (file_name, TEXT_IDX_WGT_SUFFIX, "wb", MAGIC_TEXI_WGT,
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442 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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443 |
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444 | /* [RJM 10/98 - Text Filename] */
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445 | idx = open_file (text_file_name, TEXT_IDX_SUFFIX, "rb", MAGIC_TEXI,
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446 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
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447 | if (fread (&cth, sizeof (cth), 1, idx) != 1)
|
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448 | FatalError (1, "Unable to read header of index file");
|
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449 |
|
---|
450 | /* [RPAP - Jan 97: Endian Ordering] */
|
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451 | NTOHUL(cth.num_of_docs);
|
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452 | NTOHD(cth.num_of_bytes); /* [RJM 07/97: 4G limit] */
|
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453 | NTOHUL(cth.num_of_words);
|
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454 | NTOHUL(cth.length_of_longest_doc);
|
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455 | NTOHD(cth.ratio);
|
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456 |
|
---|
457 | exact = open_file (file_name, WEIGHTS_SUFFIX, "rb", MAGIC_WGHT,
|
---|
458 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
459 |
|
---|
460 | get_NumPara ();
|
---|
461 | if (cth.num_of_docs != NumPara)
|
---|
462 | {
|
---|
463 | Message ("The number of documents does not equal "
|
---|
464 | "the number of paragraphs.");
|
---|
465 | Message ("Using the \"%s.invf.paragraph\" file\n", file_name);
|
---|
466 | para = open_file (file_name, INVF_PARAGRAPH_SUFFIX, "rb", MAGIC_PARAGRAPH,
|
---|
467 | MG_ABORT); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
468 | }
|
---|
469 | else
|
---|
470 | para = NULL;
|
---|
471 |
|
---|
472 | {
|
---|
473 | struct
|
---|
474 | {
|
---|
475 | unsigned long Start;
|
---|
476 | float Weight;
|
---|
477 | }
|
---|
478 | data;
|
---|
479 | for (i = 0; i < cth.num_of_docs; i++)
|
---|
480 | {
|
---|
481 | int count;
|
---|
482 | fread ((char *) &data.Start, sizeof (unsigned long), 1, idx);
|
---|
483 | if (para && i < cth.num_of_docs)
|
---|
484 | {
|
---|
485 | /* [RPAP - Jan 97: Endian Ordering] */
|
---|
486 | fread ((char *) &count, sizeof (count), 1, para);
|
---|
487 | NTOHSI(count);
|
---|
488 | }
|
---|
489 | else
|
---|
490 | count = 1;
|
---|
491 | while (count--)
|
---|
492 | {
|
---|
493 | fread ((char *) &data.Weight, sizeof (float), 1, exact);
|
---|
494 | NTOHF(data.Weight); /* [RPAP - Jan 97: Endian Ordering] */
|
---|
495 | data.Weight = sqrt (data.Weight);
|
---|
496 | HTONF(data.Weight); /* [RPAP - Jan 97: Endian Ordering] */
|
---|
497 | fwrite ((char *) &data, sizeof (data), 1, idx_wgt);
|
---|
498 | }
|
---|
499 | }
|
---|
500 | /* Write out the extra entry for the idx file */
|
---|
501 | fread ((char *) &data.Start, sizeof (unsigned long), 1, idx);
|
---|
502 | data.Weight = 0;
|
---|
503 | fwrite((char*)&data, sizeof(data), 1, idx_wgt);
|
---|
504 | }
|
---|
505 |
|
---|
506 | fclose (idx_wgt);
|
---|
507 | fclose (idx);
|
---|
508 | fclose (exact);
|
---|
509 | if (para)
|
---|
510 | fclose (para);
|
---|
511 | }
|
---|