1 | /**********************************************************************
|
---|
2 | *
|
---|
3 | * Suffix.cpp -- Extract the repeated phrases in the input with suffix
|
---|
4 | * and prefix arrays (cgn & gwp's simpler algorithm,
|
---|
5 | * and kjm's improvements).
|
---|
6 | *
|
---|
7 | * Copyright 2000 Gordon W. Paynter
|
---|
8 | * Copyright 2000 The New Zealand Digital Library Project
|
---|
9 | *
|
---|
10 | * A component of the Greenstone digital library software
|
---|
11 | * from the New Zealand Digital Library Project at the
|
---|
12 | * University of Waikato, New Zealand.
|
---|
13 | *
|
---|
14 | * This program is free software; you can redistribute it and/or modify
|
---|
15 | * it under the terms of the GNU General Public License as published by
|
---|
16 | * the Free Software Foundation; either version 2 of the License, or
|
---|
17 | * (at your option) any later version.
|
---|
18 | *
|
---|
19 | * This program is distributed in the hope that it will be useful,
|
---|
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
22 | * GNU General Public License for more details.
|
---|
23 | *
|
---|
24 | * You should have received a copy of the GNU General Public License
|
---|
25 | * along with this program; if not, write to the Free Software
|
---|
26 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
---|
27 | *
|
---|
28 | *********************************************************************/
|
---|
29 |
|
---|
30 | #include <assert.h>
|
---|
31 | #include <math.h>
|
---|
32 | #include <stdio.h>
|
---|
33 | #include <stdlib.h>
|
---|
34 | #include <string.h>
|
---|
35 |
|
---|
36 | #if defined(GSDL_USE_IOS_H)
|
---|
37 | # include <fstream.h>
|
---|
38 | # include <iostream.h>
|
---|
39 | #else
|
---|
40 | # include <fstream>
|
---|
41 | # include <iostream>
|
---|
42 | #endif
|
---|
43 |
|
---|
44 | #if defined(GSDL_USE_STL_H)
|
---|
45 | # if defined(GSDL_USE_ALGO_H)
|
---|
46 | # include <algo.h>
|
---|
47 | # else
|
---|
48 | # include <algorithm.h>
|
---|
49 | # endif
|
---|
50 | # include <vector.h>
|
---|
51 | #else
|
---|
52 | # include <algorithm>
|
---|
53 | # include <vector>
|
---|
54 | #endif
|
---|
55 |
|
---|
56 | #include "suffix.h"
|
---|
57 | #include "phrase.h"
|
---|
58 |
|
---|
59 | // Global variables declared in suffix.h
|
---|
60 | cellcount inputLength;
|
---|
61 |
|
---|
62 | symbol *symbols;
|
---|
63 | symbol **suffixArray;
|
---|
64 | symbol **prefixArray;
|
---|
65 | check *suffixCheck;
|
---|
66 |
|
---|
67 | // the length of the check array
|
---|
68 | cellcount checkLength;
|
---|
69 |
|
---|
70 | // How many documents are in this collection?
|
---|
71 | cellcount numberOfDocuments;
|
---|
72 | symbol **documentArray;
|
---|
73 |
|
---|
74 |
|
---|
75 | // Do we accept any phrase, or do we eliminate those ending with stopwords ?
|
---|
76 | int phraseMode = ANYPHRASE; //STOPWORDS;
|
---|
77 |
|
---|
78 |
|
---|
79 | // The filestem of the collection's phindex directory
|
---|
80 | char collection[FILENAME_MAX];
|
---|
81 |
|
---|
82 |
|
---|
83 | // The ranges of the stopword and content-word symbols for the collection
|
---|
84 | symbol firstStopSymbol = 0;
|
---|
85 | symbol lastStopSymbol = 0;
|
---|
86 | symbol firstContentSymbol = 0;
|
---|
87 | symbol lastContentSymbol = 0;
|
---|
88 |
|
---|
89 |
|
---|
90 | // Some useful comparison functions, defined below.
|
---|
91 | int suffixCompare(const void *, const void *);
|
---|
92 | int prefixCompare(const void *, const void *);
|
---|
93 | int pointerCompare(const void *, const void *);
|
---|
94 |
|
---|
95 | // some bit manipulation functions for the check arrays, defined below
|
---|
96 | int getSuffixCheck(cellindex suff);
|
---|
97 | void setSuffixCheck(cellindex suff);
|
---|
98 |
|
---|
99 | // Functions for implementing "phrase memory". These let us "remember"
|
---|
100 | // each phrase that we've expanded without using too much memory.
|
---|
101 | void initialisePhraseMemory();
|
---|
102 | void rememberThisPhrase(cellindex index, cellcount length);
|
---|
103 | bool isPhraseStored(cellindex index, cellcount length);
|
---|
104 | void deletePhraseMemory();
|
---|
105 |
|
---|
106 |
|
---|
107 | // how much output do we want?
|
---|
108 | int verbosity = 1;
|
---|
109 |
|
---|
110 |
|
---|
111 | // Get a phrase's expansions
|
---|
112 | //
|
---|
113 | // Get the set of "minimal", "maximal", non-unique expansions of a
|
---|
114 | // phrase p, using the simpler algorithm that Craig and Gordon came up
|
---|
115 | // with at Google.
|
---|
116 | //
|
---|
117 | // Returns a vector of Expansions.
|
---|
118 |
|
---|
119 | void getExpansions(Phrase &p, vector<Phrase> &results) {
|
---|
120 |
|
---|
121 | // 1. Get the initial candidates
|
---|
122 | vector<Phrase> candidates;
|
---|
123 | p.initialSuffixCandidates(candidates);
|
---|
124 | int suffcands = candidates.size();
|
---|
125 | p.initialPrefixCandidates(candidates);
|
---|
126 |
|
---|
127 | if (candidates.size() == 0)
|
---|
128 | return;
|
---|
129 |
|
---|
130 | vector<Phrase>::iterator i;
|
---|
131 | for (i = candidates.begin(); i != candidates.end(), suffcands>0; ++i, --suffcands) {
|
---|
132 | i->expandWhileUniquePrefixExtension();
|
---|
133 | i->ensureSuffixFound();
|
---|
134 | }
|
---|
135 | for (i; i != candidates.end(); ++i) {
|
---|
136 | i->expandWhileUniqueSuffixExtension();
|
---|
137 | }
|
---|
138 |
|
---|
139 | // 3. Ensure minimality: ignore phrases whose subphrases are also found
|
---|
140 | results.clear();
|
---|
141 |
|
---|
142 | // Initialise the candidates, check array, and various variables.
|
---|
143 | sort(candidates.begin(), candidates.end(), isShorter);
|
---|
144 | memset(suffixCheck, 0, sizeof(check)*checkLength);
|
---|
145 | unsigned minimum_length = candidates.begin()->length;
|
---|
146 |
|
---|
147 | // Try to add each candidate to the results set, ignoring the non-minimal
|
---|
148 | for (vector<Phrase>::iterator candidate = candidates.begin();
|
---|
149 | candidate != candidates.end(); candidate++) {
|
---|
150 |
|
---|
151 | // Make a copy of candidate to mutilate while performing sub-phrase checks
|
---|
152 | Phrase temp_phrase(*candidate);
|
---|
153 | bool shorter_found = false;
|
---|
154 |
|
---|
155 | // Check for shorter and shorter versions of the tenporary phrase
|
---|
156 | while (temp_phrase.length >= minimum_length && !shorter_found) {
|
---|
157 | temp_phrase.ensureSuffixFound();
|
---|
158 | //if (suffixCheck[temp_phrase.firstSuffixIndex] == 0)
|
---|
159 | if (getSuffixCheck(temp_phrase.firstSuffixIndex)==0)
|
---|
160 | temp_phrase.shortenByOneAtPrefix();
|
---|
161 | else
|
---|
162 | shorter_found = true;
|
---|
163 |
|
---|
164 | // Possible efficiency here: we can finish if the prefix of c
|
---|
165 | // and temp_phrase are the same for candidate->length symbols.
|
---|
166 | }
|
---|
167 |
|
---|
168 | if (!shorter_found) {
|
---|
169 | results.push_back(*candidate);
|
---|
170 | candidate->ensureSuffixFound();
|
---|
171 | for (cellcount k = candidate->firstSuffixIndex; k <= candidate->lastSuffixIndex; ++k)
|
---|
172 | //suffixCheck[k] = candidate->length;
|
---|
173 | setSuffixCheck(k);
|
---|
174 | }
|
---|
175 | }
|
---|
176 | }
|
---|
177 |
|
---|
178 |
|
---|
179 | // suffixCompare
|
---|
180 | //
|
---|
181 | // Compare two pointers into a suffix array. We use this in the
|
---|
182 | // qsort function, so the input are pointers to pointers.
|
---|
183 | //
|
---|
184 | // Return -1 if (a < b), otherwise (a > b) so return +1,
|
---|
185 |
|
---|
186 | int suffixCompare(const void *cpa, const void *cpb) {
|
---|
187 |
|
---|
188 | // Cast then dereference pointers to suffix array elements
|
---|
189 | symbol *pa = (symbol *) cpa;
|
---|
190 | symbol *pb = (symbol *) cpb;
|
---|
191 | pa = (symbol *) *pa;
|
---|
192 | pb = (symbol *) *pb;
|
---|
193 |
|
---|
194 | // If the two elements are the same, examine the next one
|
---|
195 | while (*pa == *pb) {
|
---|
196 | *pa++;
|
---|
197 | *pb++;
|
---|
198 | }
|
---|
199 |
|
---|
200 | // Make the copmparison and return
|
---|
201 | if ( *pa < *pb) {
|
---|
202 | return -1;
|
---|
203 | } else {
|
---|
204 | return +1;
|
---|
205 | }
|
---|
206 | }
|
---|
207 |
|
---|
208 |
|
---|
209 | // prefixCompare
|
---|
210 | //
|
---|
211 | // Compare two pointers into a prefix array. We use this in the
|
---|
212 | // qsort function, so the input are pointers to pointers.
|
---|
213 | //
|
---|
214 | // Return -1 if (a > b), otherwise (a < b) so return +1,
|
---|
215 |
|
---|
216 | int prefixCompare(const void *cpa, const void *cpb) {
|
---|
217 |
|
---|
218 | // Cast then dereference pointers to prefix array elements
|
---|
219 | symbol *pa = (symbol *) cpa;
|
---|
220 | symbol *pb = (symbol *) cpb;
|
---|
221 | pa = (symbol *) *pa;
|
---|
222 | pb = (symbol *) *pb;
|
---|
223 |
|
---|
224 | // If the two elements are the same, examine the next one
|
---|
225 | while (*pa == *pb) {
|
---|
226 | *pa--;
|
---|
227 | *pb--;
|
---|
228 | }
|
---|
229 |
|
---|
230 | // Make the copmparison and return
|
---|
231 | if ( *pa > *pb) {
|
---|
232 | return -1;
|
---|
233 | } else {
|
---|
234 | return +1;
|
---|
235 | }
|
---|
236 | }
|
---|
237 |
|
---|
238 | // simpleCompare
|
---|
239 | //
|
---|
240 | // Compare two pointers based on the memory location they point to.
|
---|
241 |
|
---|
242 | int pointerCompare( const void *pa, const void *pb ) {
|
---|
243 |
|
---|
244 | symbol **a = (symbol **) pa;
|
---|
245 | symbol **b = (symbol **) pb;
|
---|
246 |
|
---|
247 | if (*a < *b) {
|
---|
248 | return -1;
|
---|
249 | } else if (*a > *b) {
|
---|
250 | return 1;
|
---|
251 | } else {
|
---|
252 | return 0;
|
---|
253 | }
|
---|
254 | }
|
---|
255 |
|
---|
256 | int getSuffixCheck(cellindex suff) {
|
---|
257 | cellindex cell = suff >> 3;
|
---|
258 | check remainder = suff & 0x07; // the last 3 bits
|
---|
259 | if (suffixCheck[cell]& (1 << remainder)) {
|
---|
260 | return 1;
|
---|
261 | }
|
---|
262 | return 0;
|
---|
263 | }
|
---|
264 | void setSuffixCheck(cellindex suff) {
|
---|
265 | cellindex cell = suff >> 3;
|
---|
266 | check remainder = suff & 0x07; // the last 3 bits
|
---|
267 | suffixCheck[cell] |= (1 << remainder);
|
---|
268 |
|
---|
269 | }
|
---|
270 |
|
---|
271 | // Read the clauses.numbers file into the "symbols" array.
|
---|
272 | //
|
---|
273 | // Each number in the file is a symbol number; it is essential that
|
---|
274 | // the first symbol (and no others) be COLLECTIONSTART and the last
|
---|
275 | // symbol (and no others) be COLLECTIONEND.
|
---|
276 | //
|
---|
277 | // Return the number of numbers in the array.
|
---|
278 |
|
---|
279 | int readNumbers() {
|
---|
280 |
|
---|
281 | char filename[FILENAME_MAX];
|
---|
282 | sprintf(filename, "%s/clauses.numbers", collection);
|
---|
283 | if (verbosity) {
|
---|
284 | cout << "Reading numbers file: " << filename << endl;
|
---|
285 | }
|
---|
286 |
|
---|
287 | // Open the numbers file
|
---|
288 | ifstream inFile1(filename, ios::in);
|
---|
289 | if (!inFile1) {
|
---|
290 | cerr << "File " << filename << " could not be opened\n";
|
---|
291 | exit(1);
|
---|
292 | }
|
---|
293 |
|
---|
294 | // Count the number of symbols
|
---|
295 | inputLength = 0;
|
---|
296 | symbol word;
|
---|
297 | while (inFile1 >> word) {
|
---|
298 | inputLength++;
|
---|
299 | }
|
---|
300 | inFile1.close();
|
---|
301 |
|
---|
302 | // Allocate the symbbols array
|
---|
303 | if (verbosity > 1) {
|
---|
304 | cout << "Allocating symbol arrays for " << inputLength << " symbols" << endl;
|
---|
305 | }
|
---|
306 | symbols = new symbol[inputLength];
|
---|
307 | if (symbols == NULL) {
|
---|
308 | cerr << "Suffix error: not enough memory to hold " << inputLength
|
---|
309 | << " symbols." << endl;
|
---|
310 | exit(2);
|
---|
311 | }
|
---|
312 |
|
---|
313 | // Read the numbers file into the numbers array
|
---|
314 | if (verbosity > 2) {
|
---|
315 | cout << "Reading the numbers" << endl;
|
---|
316 | }
|
---|
317 |
|
---|
318 | ifstream inFile2(filename, ios::in);
|
---|
319 | if (!inFile2) {
|
---|
320 | cerr << "File " << filename << " could not be opened\n";
|
---|
321 | exit(1);
|
---|
322 | }
|
---|
323 | cellcount next = 0;
|
---|
324 | numberOfDocuments = 0;
|
---|
325 | while (inFile2 >> word) {
|
---|
326 | symbols[next++] = word;
|
---|
327 | if (word == DOCUMENTSTART) {
|
---|
328 | numberOfDocuments++;
|
---|
329 | }
|
---|
330 | }
|
---|
331 | inFile2.close();
|
---|
332 |
|
---|
333 | // Make sure the numbers file is intact
|
---|
334 | assert(symbols[0] == COLLECTIONSTART);
|
---|
335 | assert(symbols[next-1] == COLLECTIONEND);
|
---|
336 |
|
---|
337 | return inputLength;
|
---|
338 | }
|
---|
339 |
|
---|
340 |
|
---|
341 |
|
---|
342 | // Get Document Occurrance statistics
|
---|
343 | //
|
---|
344 | // Given a phrase, what documents does it occur in?
|
---|
345 |
|
---|
346 | cellcount getDocumentOccurrances(const Phrase &p, cellcount *frequency) {
|
---|
347 |
|
---|
348 | // cout << "searching for \""<< p << "\" in documents "
|
---|
349 | // << 0 << "-" << numberOfDocuments - 1 << endl;
|
---|
350 |
|
---|
351 | // The number of documents in which this phrase occurs
|
---|
352 | cellcount df = 0;
|
---|
353 |
|
---|
354 | // Initialise the document frequency array
|
---|
355 | // for (cellindex i = 0; i < numberOfDocuments; i++) {
|
---|
356 | // frequency[i] = 0;
|
---|
357 | //}
|
---|
358 | memset(frequency, 0, sizeof(cellcount)*numberOfDocuments);
|
---|
359 |
|
---|
360 | // variables used to facilitate the search
|
---|
361 | cellindex begin;
|
---|
362 | cellindex end;
|
---|
363 | cellindex d;
|
---|
364 | symbol *target;
|
---|
365 | bool found;
|
---|
366 |
|
---|
367 | // search for the document in which each occurence of the phrase is found
|
---|
368 | for (cellcount j = p.firstSuffixIndex; j <= p.lastSuffixIndex; j++) {
|
---|
369 |
|
---|
370 | // cout << "looking for phrase at suffixArray[" << j << "]\n";
|
---|
371 |
|
---|
372 | target = suffixArray[j];
|
---|
373 | begin = 0;
|
---|
374 | end = numberOfDocuments - 1;
|
---|
375 | found = false;
|
---|
376 |
|
---|
377 | // Search for the occurence of a document delimiter that target
|
---|
378 | // occurs immediately after.
|
---|
379 | // We do this by performing a binary chop search on documentArray.
|
---|
380 | while (!found) {
|
---|
381 |
|
---|
382 | // cout << "searching for " << (cellindex) target << " in "
|
---|
383 | // << begin << " - " << end << endl;
|
---|
384 |
|
---|
385 | assert (begin <= end);
|
---|
386 |
|
---|
387 | // If the beginning and end of the interval are the same,
|
---|
388 | // then we've found the correct document
|
---|
389 | if (begin == end) {
|
---|
390 | if (frequency[begin] == 0) {
|
---|
391 | df++;
|
---|
392 | }
|
---|
393 | frequency[begin]++;
|
---|
394 | found = true;
|
---|
395 | }
|
---|
396 |
|
---|
397 | // Otherwise, examine a new document midway through the begin-end
|
---|
398 | // interval and see if it is the one.
|
---|
399 | else {
|
---|
400 | d = (begin + end) / 2;
|
---|
401 | if (target > documentArray[d]) {
|
---|
402 | // If target addrss is greater than this, but thisi sthe last document,
|
---|
403 | // then this must be the one we want. Or, if target is greater than
|
---|
404 | // this one but less then the next, this must be the one we wnat.
|
---|
405 | if ((d == numberOfDocuments - 1) || (target < documentArray[d+1])) {
|
---|
406 | if (frequency[d] == 0) {
|
---|
407 | df++;
|
---|
408 | }
|
---|
409 | frequency[d]++;
|
---|
410 | found = true;
|
---|
411 | } else {
|
---|
412 | // otherwise we know to search later in the document set
|
---|
413 | begin = d + 1;
|
---|
414 | }
|
---|
415 | } else {
|
---|
416 | // search earlier in the document set
|
---|
417 | end = d - 1;
|
---|
418 | }
|
---|
419 | }
|
---|
420 | }
|
---|
421 | }
|
---|
422 | return df;
|
---|
423 | }
|
---|
424 |
|
---|
425 |
|
---|
426 |
|
---|
427 |
|
---|
428 |
|
---|
429 |
|
---|
430 | // phraseExpansionMemory : Which phrases have we expanded?
|
---|
431 | //
|
---|
432 | // A set of utilities for keeping track of which phrases we have expanded.
|
---|
433 | // We don't want to expand a phrase more than once, after all.
|
---|
434 | //
|
---|
435 | // This REALLY ought to be in its own class, but it works so that's okay.
|
---|
436 | //
|
---|
437 | // Phrases are identified by their firstSuffixPosition and length.
|
---|
438 | //
|
---|
439 | // Functions provided are:
|
---|
440 | // void initialisePhraseMemory()
|
---|
441 | // void rememberThisPhrase(index, length)
|
---|
442 | // bool isPhraseStored(index, length)
|
---|
443 | // void deletePhraseMemory()
|
---|
444 | //
|
---|
445 | // Internally, we will have two separate cases:
|
---|
446 | //
|
---|
447 | // Phrases of length 1-8:
|
---|
448 | // unsigned char phraseMemory[inputLength]
|
---|
449 | // is an array where each cell "remembers" the corresponding index in the
|
---|
450 | // suffixArray, and each of the 8 bits of the cell correspond to the phrases
|
---|
451 | // of length 1, 2... 8.
|
---|
452 | // Eventually, we will make this disk-based (i.e. store the array in a file).
|
---|
453 | //
|
---|
454 | // Phrases of length 9+:
|
---|
455 | // file hashTableFile
|
---|
456 | // file listOfEntries
|
---|
457 | // The first file is a hash table; each phrase maps to one of its cells, which
|
---|
458 | // contains either 0 (empty, no occurence) or a number which is an entry number
|
---|
459 | // in the second file. This file contains a "list" of entries. Each consists of
|
---|
460 | // three numbers: the suffixArray index of the phrase, the length of the phrase,
|
---|
461 | // and the entry number of the next phrase with the same hash.
|
---|
462 | //
|
---|
463 |
|
---|
464 |
|
---|
465 | unsigned char *phraseMemory;
|
---|
466 |
|
---|
467 | void initialiseLongPhraseMemory();
|
---|
468 | void rememberThisLongPhrase(cellindex index, cellcount length);
|
---|
469 | bool isLongPhraseStored(cellindex index, cellcount length);
|
---|
470 | void deleteLongPhraseMemory();
|
---|
471 |
|
---|
472 |
|
---|
473 | void initialisePhraseMemory() {
|
---|
474 |
|
---|
475 | phraseMemory = new unsigned char[inputLength];
|
---|
476 |
|
---|
477 | // to begin with, everything is empty
|
---|
478 | // for (cellcount i = 0; i < inputLength; i++) {
|
---|
479 | // phraseMemory[i] = 0;
|
---|
480 | //}
|
---|
481 | memset(phraseMemory, 0, sizeof(char)*inputLength);
|
---|
482 |
|
---|
483 | // intialise the hashTable of long phrases
|
---|
484 | initialiseLongPhraseMemory();
|
---|
485 |
|
---|
486 | }
|
---|
487 |
|
---|
488 | void rememberThisPhrase(cellindex index, cellcount length) {
|
---|
489 |
|
---|
490 | // if the phrase is very long, use the file-based system
|
---|
491 | if (length > 8) {
|
---|
492 | rememberThisLongPhrase(index, length);
|
---|
493 | return;
|
---|
494 | }
|
---|
495 |
|
---|
496 | // create a char with just the bit corresponding to length set
|
---|
497 | unsigned char newbit = 1;
|
---|
498 | for (cellcount i = 1; i < length; i++) {
|
---|
499 | newbit <<= 1;
|
---|
500 | }
|
---|
501 |
|
---|
502 | // set that bit in the memory array at position index
|
---|
503 | phraseMemory[index] |= newbit;
|
---|
504 | }
|
---|
505 |
|
---|
506 |
|
---|
507 | bool isPhraseStored(cellindex index, cellcount length) {
|
---|
508 |
|
---|
509 | // if the phrase is very long, use the file-based system
|
---|
510 | if (length > 8) {
|
---|
511 | return isLongPhraseStored(index, length);
|
---|
512 | }
|
---|
513 |
|
---|
514 | // create a char with just the bit corresponding to length set
|
---|
515 | unsigned char newbit = 1;
|
---|
516 | for (cellcount i = 1; i < length; i++) {
|
---|
517 | newbit <<= 1;
|
---|
518 | }
|
---|
519 |
|
---|
520 | // retrurn true if that bit is set in memory arrayat position index
|
---|
521 | return (phraseMemory[index] & newbit);
|
---|
522 | }
|
---|
523 |
|
---|
524 | void deletePhraseMemory() {
|
---|
525 | delete phraseMemory;
|
---|
526 | deleteLongPhraseMemory();
|
---|
527 | }
|
---|
528 |
|
---|
529 |
|
---|
530 |
|
---|
531 | // Files etc used to store "long" equavlents of the above
|
---|
532 |
|
---|
533 | fstream hashTableFile;
|
---|
534 | char hashTableFileName[FILENAME_MAX];
|
---|
535 | fstream listOfEntries;
|
---|
536 | char listOfEntriesName[FILENAME_MAX];
|
---|
537 | cellindex nextEntryNumber;
|
---|
538 |
|
---|
539 | const cellcount bigPrime = 7919;
|
---|
540 |
|
---|
541 |
|
---|
542 | void initialiseLongPhraseMemory() {
|
---|
543 |
|
---|
544 | cellindex example = 0;
|
---|
545 |
|
---|
546 | sprintf(hashTableFileName, "%s/hashTable", collection);
|
---|
547 | sprintf(listOfEntriesName, "%s/hashLists", collection);
|
---|
548 |
|
---|
549 |
|
---|
550 | // create the new hashtable
|
---|
551 | if (verbosity > 1) {
|
---|
552 | cout << "Initialising hashTable: " << hashTableFileName << endl;
|
---|
553 | }
|
---|
554 | hashTableFile.open(hashTableFileName, ios::in | ios::out);
|
---|
555 | for (cellcount i = 0; i < bigPrime; i++) {
|
---|
556 | hashTableFile.write((char *) &example, sizeof(example));
|
---|
557 | }
|
---|
558 |
|
---|
559 | // create the list of phrases
|
---|
560 | if (verbosity > 1) {
|
---|
561 | cout << "Initialising list of hashtable entries: " << listOfEntriesName << endl;
|
---|
562 | }
|
---|
563 | listOfEntries.open(listOfEntriesName, ios::in | ios::out);
|
---|
564 | listOfEntries.write((char *) &example, sizeof(example));
|
---|
565 | listOfEntries.write((char *) &example, sizeof(example));
|
---|
566 | listOfEntries.write((char *) &example, sizeof(example));
|
---|
567 | nextEntryNumber = 1;
|
---|
568 | }
|
---|
569 |
|
---|
570 |
|
---|
571 | void rememberThisLongPhrase(cellindex index, cellcount length) {
|
---|
572 |
|
---|
573 | // cout << "rememberThisLongPhrase(" << index << ", " << length << ")\n";
|
---|
574 |
|
---|
575 | cellindex hashOffset = ((index + length) % bigPrime) * sizeof(cellindex);
|
---|
576 | cellindex pointer;
|
---|
577 | cellindex zero = 0;
|
---|
578 | cellindex readp = 0;
|
---|
579 | cellindex readi = 0;
|
---|
580 | cellindex readl = 0;
|
---|
581 |
|
---|
582 | hashTableFile.seekg(hashOffset);
|
---|
583 | hashTableFile.read((char *) &pointer, sizeof(cellindex));
|
---|
584 |
|
---|
585 | if (pointer == 0) {
|
---|
586 | // There is no entry at all in the hash table for this entry
|
---|
587 | // so create one
|
---|
588 |
|
---|
589 | pointer = nextEntryNumber++;
|
---|
590 | hashTableFile.seekg(hashOffset);
|
---|
591 | hashTableFile.write((char *) &pointer, sizeof(cellindex));
|
---|
592 |
|
---|
593 | listOfEntries.seekp(pointer * sizeof(cellindex) * 3);
|
---|
594 | listOfEntries.write((char *) &zero, sizeof(cellindex));
|
---|
595 | listOfEntries.write((char *) &index, sizeof(cellindex));
|
---|
596 | listOfEntries.write((char *) &length, sizeof(cellindex));
|
---|
597 |
|
---|
598 | } else {
|
---|
599 | // There is a list starting at this hash value, so the phrase may
|
---|
600 | // be already remembered, or it might need to be appended
|
---|
601 |
|
---|
602 | while (pointer != 0) {
|
---|
603 | // Read the entry pointed to by pointer
|
---|
604 | listOfEntries.seekg(pointer * sizeof(cellindex) * 3);
|
---|
605 | listOfEntries.read((char *) &readp, sizeof(cellindex));
|
---|
606 | listOfEntries.read((char *) &readi, sizeof(cellindex));
|
---|
607 | listOfEntries.read((char *) &readl, sizeof(cellindex));
|
---|
608 |
|
---|
609 | // cout << "read " << pointer << ", " << readp << ", " << readi << ", " << readl << endl;
|
---|
610 |
|
---|
611 | if ((readi == index) && (readl = length)) {
|
---|
612 | // we've found that we've already stored it
|
---|
613 | return;
|
---|
614 | } else if (readp == 0) {
|
---|
615 | // we're reached the end of the list. Add a new entry.
|
---|
616 | listOfEntries.seekp(pointer * sizeof(cellindex) * 3);
|
---|
617 | listOfEntries.write((char *) &nextEntryNumber, sizeof(cellindex));
|
---|
618 | pointer = nextEntryNumber++;
|
---|
619 |
|
---|
620 | listOfEntries.seekp(pointer * sizeof(cellindex) * 3);
|
---|
621 | listOfEntries.write((char *) &zero, sizeof(cellindex));
|
---|
622 | listOfEntries.write((char *) &index, sizeof(cellindex));
|
---|
623 | listOfEntries.write((char *) &length, sizeof(cellindex));
|
---|
624 | return;
|
---|
625 | } else {
|
---|
626 | // go on to the next node
|
---|
627 | pointer = readp;
|
---|
628 | }
|
---|
629 | }
|
---|
630 | }
|
---|
631 |
|
---|
632 |
|
---|
633 | }
|
---|
634 |
|
---|
635 |
|
---|
636 | bool isLongPhraseStored(cellindex index, cellcount length) {
|
---|
637 |
|
---|
638 | // cout << "isLongPhraseExpanded(" << index << ", " << length << ")\n";
|
---|
639 |
|
---|
640 | cellindex hashOffset = ((index + length) % bigPrime) * sizeof(cellindex);
|
---|
641 | cellindex pointer;
|
---|
642 | cellindex readp = 0;
|
---|
643 | cellindex readi = 0;
|
---|
644 | cellindex readl = 0;
|
---|
645 |
|
---|
646 | // Find the phrase in the hashFile
|
---|
647 | hashTableFile.seekg(hashOffset);
|
---|
648 | hashTableFile.read((char *) &pointer, sizeof(cellindex));
|
---|
649 |
|
---|
650 | if (pointer == 0) {
|
---|
651 | // There is no entry at all in the hash table for this entry
|
---|
652 | // so nothing is stored
|
---|
653 | return false;
|
---|
654 |
|
---|
655 | } else {
|
---|
656 | // There is a list starting at this hash value, so the phrase may
|
---|
657 | // be already remembered in that list
|
---|
658 | while (pointer != 0) {
|
---|
659 | // Read the entry pointed to by pointer
|
---|
660 | listOfEntries.seekg(pointer * sizeof(cellindex) * 3);
|
---|
661 | listOfEntries.read((char *) &readp, sizeof(cellindex));
|
---|
662 | listOfEntries.read((char *) &readi, sizeof(cellindex));
|
---|
663 | listOfEntries.read((char *) &readl, sizeof(cellindex));
|
---|
664 |
|
---|
665 | if ((readi == index) && (readl = length)) {
|
---|
666 | // we've found the phrase stored here
|
---|
667 | return true;
|
---|
668 | } else {
|
---|
669 | // go on to the next node
|
---|
670 | pointer = readp;
|
---|
671 | }
|
---|
672 | }
|
---|
673 | }
|
---|
674 | return false;
|
---|
675 | }
|
---|
676 |
|
---|
677 |
|
---|
678 | void deleteLongPhraseMemory() {
|
---|
679 | // remove the hash & other files
|
---|
680 |
|
---|
681 | hashTableFile.close();
|
---|
682 | listOfEntries.close();
|
---|
683 | remove(hashTableFileName);
|
---|
684 | remove(listOfEntriesName);
|
---|
685 |
|
---|
686 | }
|
---|
687 |
|
---|
688 |
|
---|
689 | // Read the collection statistics file
|
---|
690 | //
|
---|
691 | void readStatistics() {
|
---|
692 |
|
---|
693 | // open the statistics file
|
---|
694 | char filename[FILENAME_MAX];
|
---|
695 | sprintf(filename, "%s/clauses.stats", collection);
|
---|
696 |
|
---|
697 | // Open the file
|
---|
698 | ifstream inFile(filename, ios::in);
|
---|
699 | if (!inFile) {
|
---|
700 | cerr << "File " << filename << " could not be opened\n";
|
---|
701 | exit(1);
|
---|
702 | }
|
---|
703 |
|
---|
704 | // Read the numbers file into the numbers array
|
---|
705 | char key[1000];
|
---|
706 | symbol value;
|
---|
707 | while (inFile >> key >> value){
|
---|
708 | if (strcmp(key, "first_stopword") == 0) {
|
---|
709 | firstStopSymbol = value;
|
---|
710 | } else if (strcmp(key, "last_stopword") == 0) {
|
---|
711 | lastStopSymbol = value;
|
---|
712 | } else if (strcmp(key, "first_contentword") == 0) {
|
---|
713 | firstContentSymbol = value;
|
---|
714 | } else if (strcmp(key, "last_contentword") == 0) {
|
---|
715 | lastContentSymbol = value;
|
---|
716 | }
|
---|
717 | }
|
---|
718 | inFile.close();
|
---|
719 |
|
---|
720 | // Make sure we have the information we need
|
---|
721 | if (!(firstStopSymbol && lastStopSymbol && firstContentSymbol && lastContentSymbol)) {
|
---|
722 | cerr << "Statistics file incomplete" << endl;
|
---|
723 | exit(1);
|
---|
724 | }
|
---|
725 | }
|
---|
726 |
|
---|
727 | cellcount getContentCount(symbol firstContent) {
|
---|
728 |
|
---|
729 | cellcount content=0;
|
---|
730 | for (cellcount i=0; i<inputLength; i++) {
|
---|
731 | if (symbols[i]>=firstContent) content++;
|
---|
732 | }
|
---|
733 |
|
---|
734 | return content;
|
---|
735 | }
|
---|
736 |
|
---|
737 | int main (int argc, char * argv[]) {
|
---|
738 |
|
---|
739 | // Command-line arguments
|
---|
740 | // argv[1] is the phindex directory
|
---|
741 | // argv[2] is the maximum array symbol length (optional)
|
---|
742 | // argv[3] is the mode, where 1 is stopword mode (optional)
|
---|
743 | if (argc < 2) {
|
---|
744 | cerr << "Usage: " << argv[0] << " phind-directory mode [verbosity]" << endl;
|
---|
745 | exit(1);
|
---|
746 | }
|
---|
747 |
|
---|
748 | // collection directory
|
---|
749 | strcpy(collection, argv[1]);
|
---|
750 |
|
---|
751 | // mode parameter
|
---|
752 | phraseMode = atoi(argv[2]);
|
---|
753 | assert((phraseMode == STOPWORDS) || (phraseMode == ANYPHRASE));
|
---|
754 |
|
---|
755 | // optional verbosity parameter
|
---|
756 | if (argc == 4) {
|
---|
757 | verbosity = atoi(argv[3]);
|
---|
758 | assert (verbosity >= 0);
|
---|
759 | }
|
---|
760 |
|
---|
761 | if (verbosity) {
|
---|
762 | cout << "suffix: the phrase extraction program" << endl;
|
---|
763 | }
|
---|
764 |
|
---|
765 | if (verbosity > 1) {
|
---|
766 | if (phraseMode == STOPWORDS) {
|
---|
767 | cout << "Stopwords mode: no phrase may begin or end with a stopword" << endl;
|
---|
768 | } else {
|
---|
769 | cout << "AllPhrase mode: extract every phrase that occurs more than once" << endl;
|
---|
770 | }
|
---|
771 | }
|
---|
772 |
|
---|
773 | // Read the statistics file
|
---|
774 | readStatistics();
|
---|
775 |
|
---|
776 | // Read the numbers file
|
---|
777 | readNumbers();
|
---|
778 |
|
---|
779 | if (numberOfDocuments == 0) {
|
---|
780 | cerr << "There are no documents in this collection!" << endl;
|
---|
781 | exit(1);
|
---|
782 | }
|
---|
783 |
|
---|
784 | symbol firstContent;
|
---|
785 | if (phraseMode==STOPWORDS) firstContent=firstContentSymbol;
|
---|
786 | else firstContent = firstStopSymbol;
|
---|
787 |
|
---|
788 | cellcount contentLength = 0;
|
---|
789 | contentLength = getContentCount(firstContent);
|
---|
790 |
|
---|
791 | // Create the suffix & prefix arrays
|
---|
792 | suffixArray = new symbol *[contentLength];
|
---|
793 | prefixArray = new symbol *[contentLength];
|
---|
794 |
|
---|
795 | cellcount here=0;
|
---|
796 | // Initialise prefix and suffix arrays, only use the needed suffixes
|
---|
797 | for (cellcount j = 0; j < inputLength; j++) {
|
---|
798 | if (symbols[j]>=firstContent) {
|
---|
799 | suffixArray[here] = &symbols[j];
|
---|
800 | prefixArray[here] = &symbols[j];
|
---|
801 | here++;
|
---|
802 | }
|
---|
803 | }
|
---|
804 | qsort(suffixArray, contentLength, sizeof(symbol *), suffixCompare);
|
---|
805 | qsort(prefixArray, contentLength, sizeof(symbol *), prefixCompare);
|
---|
806 |
|
---|
807 | checkLength = contentLength/8 + 1;
|
---|
808 | suffixCheck = new check[checkLength];
|
---|
809 | if (suffixCheck == NULL) {
|
---|
810 | cerr << "Suffix error: not enough memory to hold " << inputLength << " symbols." << endl;
|
---|
811 | exit(2);
|
---|
812 | }
|
---|
813 | memset(suffixCheck, 0, sizeof(check)*checkLength);
|
---|
814 |
|
---|
815 | cout <<"\ngenerating the phrase hierarchy\n\n";
|
---|
816 |
|
---|
817 | // Create the document arrays
|
---|
818 | if (verbosity > 1) {
|
---|
819 | cout << "Allocating document arrays for " << numberOfDocuments << " documents" << endl;
|
---|
820 | }
|
---|
821 |
|
---|
822 | // The document frequecy array is used to count the number of times
|
---|
823 | // each phrase occurs in each document. The number of documents in
|
---|
824 | // which a phrase occurs is stored in df.
|
---|
825 | frequency *documentFrequency = new frequency[numberOfDocuments];
|
---|
826 | frequency df;
|
---|
827 |
|
---|
828 | // documentArray will be searched in order to discover which document
|
---|
829 | // each phrase occurs in.
|
---|
830 | documentArray = new symbol *[numberOfDocuments];
|
---|
831 |
|
---|
832 | // just scan through the input text to find the doc starts
|
---|
833 | cellindex d = 0;
|
---|
834 | for (cellindex i=0; i<inputLength; i++) {
|
---|
835 | if (symbols[i] == DOCUMENTSTART) {
|
---|
836 | documentArray[d] = &symbols[i];
|
---|
837 | d++;
|
---|
838 | }
|
---|
839 | }
|
---|
840 |
|
---|
841 | // the phrases stuff is expecting inputLength to be the length of the
|
---|
842 | // suffix array, so change it.
|
---|
843 | inputLength = contentLength;
|
---|
844 |
|
---|
845 | // Extract phrases
|
---|
846 | //
|
---|
847 | // We will make several passesover the data, in each case considering
|
---|
848 | // a set of input phrases and generating a set of output phrases, which
|
---|
849 | // we will expancd in later passes.
|
---|
850 | //
|
---|
851 | // The input phrases in the first pass will be the vocabulary.
|
---|
852 | // In later passes, the input phrases will be the output phrases of the
|
---|
853 | // previous pass.
|
---|
854 | //
|
---|
855 | // In each pass we will consider each input phrase in turn. If we
|
---|
856 | // have seen it before, we will ignore it. Otherwise, we will expand
|
---|
857 | // it and add its expansions to the set of output phrases.
|
---|
858 |
|
---|
859 | // Store the phrase data in the phrases file
|
---|
860 | char phraseDataName[FILENAME_MAX];
|
---|
861 | sprintf(phraseDataName, "%s/phrases", collection);
|
---|
862 | ofstream phraseData(phraseDataName, ios::out);
|
---|
863 | if (!phraseData) {
|
---|
864 | cout << "File " << phraseDataName << " could not be opened\n";
|
---|
865 | exit(1);
|
---|
866 | }
|
---|
867 |
|
---|
868 | // Count the number of phrases output
|
---|
869 | unsigned long int phraseCounter = 0;
|
---|
870 |
|
---|
871 | // Set up the phrase expansion memory.
|
---|
872 | // We need this so that we don't expand a phrase more than once
|
---|
873 | initialisePhraseMemory();
|
---|
874 |
|
---|
875 | // The current pass numebr
|
---|
876 | int phrasePass = 1;
|
---|
877 |
|
---|
878 |
|
---|
879 | // PASS NUMBER 1
|
---|
880 | if (verbosity > 1) {
|
---|
881 | cout << "Starting pass " << phrasePass << endl;
|
---|
882 | }
|
---|
883 |
|
---|
884 | ofstream outPhrase;
|
---|
885 | char outPhraseName[FILENAME_MAX];
|
---|
886 | unsigned long int outPhraseCounter = 0;
|
---|
887 |
|
---|
888 | // On the first pass, simply work through the vocabulary
|
---|
889 | sprintf(outPhraseName, "%s/outPhrase.1", collection);
|
---|
890 | outPhrase.open(outPhraseName, ios::out);
|
---|
891 | if (!outPhrase) {
|
---|
892 | cerr << "File " << outPhraseName << " could not be opened\n";
|
---|
893 | exit(1);
|
---|
894 | }
|
---|
895 |
|
---|
896 | // Iterate over the different symbols by working through the suffix array
|
---|
897 | vector<Phrase> result;
|
---|
898 | cellindex ij = 0;
|
---|
899 | char *tmpString;
|
---|
900 |
|
---|
901 | Phrase p;
|
---|
902 | while (ij < inputLength) {
|
---|
903 |
|
---|
904 | // make a new phrase of length 1
|
---|
905 | p = Phrase(suffixArray[ij], 1, SUFFIX);
|
---|
906 | p.findFirstAndLastSuffix(ij, inputLength-1);
|
---|
907 |
|
---|
908 | // We ignore this symbol if it occurs only once, if it is a delimiter,
|
---|
909 | // of if we are in stopwords mode and it is a stopword
|
---|
910 | // - in this new version, only need to check freq
|
---|
911 | // We could imagine a new mode/command-line option, which is like
|
---|
912 | // STOPWORDS but without this restrictrion. This would let you browse
|
---|
913 | // from "the" to "the AGRIS" for example, but not from "AGRIS" to
|
---|
914 | // "the AGRIS" (where the is a stopword and AGRIS a content word).
|
---|
915 | // The system used to work like this; it is easy to implement, but
|
---|
916 | // it explodes the size of the indexes. So: would it be useful?
|
---|
917 | if (p.suffixFrequency > 1) {
|
---|
918 | // Get minimal expansions of the phrase
|
---|
919 | getExpansions(p, result);
|
---|
920 |
|
---|
921 | if (!result.empty()) {
|
---|
922 |
|
---|
923 | // Remember that we have expanded this phrase
|
---|
924 | rememberThisPhrase(ij, 1);
|
---|
925 |
|
---|
926 | // write the phrase text
|
---|
927 | phraseData << ij << "-1:" << p << ":" << p.suffixFrequency << ":"
|
---|
928 | << result.size() << ":";
|
---|
929 |
|
---|
930 | // write the results
|
---|
931 | for (cellcount k = 0; k < result.size(); k++) {
|
---|
932 | if (k) {
|
---|
933 | phraseData << ",";
|
---|
934 | }
|
---|
935 | phraseData << result[k].firstSuffixIndex << "-" << result[k].length;
|
---|
936 | outPhrase << result[k].firstSuffixIndex << " " << result[k].length << endl;
|
---|
937 | outPhraseCounter++;
|
---|
938 | }
|
---|
939 | result.clear();
|
---|
940 |
|
---|
941 | // Write the documents in which this phrase occurs
|
---|
942 | df = getDocumentOccurrances(p, documentFrequency);
|
---|
943 | phraseData << ":" << df << ":";
|
---|
944 |
|
---|
945 | // write the documents
|
---|
946 | for (cellcount m = 0, first = 1; m < numberOfDocuments; m++) {
|
---|
947 | if (documentFrequency[m]) {
|
---|
948 | if (first) {
|
---|
949 | first = 0;
|
---|
950 | } else {
|
---|
951 | phraseData << ";";
|
---|
952 | }
|
---|
953 | // Output the document number. Note that here we've numbered the
|
---|
954 | // N documents from 0 to N-1, but later they'll be 1-N. Thus we
|
---|
955 | // add 1 to the document id when we output it.
|
---|
956 | phraseData << "d" << (m+1);
|
---|
957 | // Next, output the frequency with which the document occurs, but
|
---|
958 | // only if it is > 1.
|
---|
959 | if (documentFrequency[m] > 1) {
|
---|
960 | phraseData << "," << documentFrequency[m];
|
---|
961 | }
|
---|
962 | }
|
---|
963 | }
|
---|
964 |
|
---|
965 | phraseData << endl;
|
---|
966 | phraseCounter++;
|
---|
967 |
|
---|
968 | // feedback
|
---|
969 | if (verbosity) {
|
---|
970 | if (phraseCounter % 1000 == 0) {
|
---|
971 | cout << "phrase " << phraseCounter << ": "
|
---|
972 | << "cell " << p.firstSuffixIndex << " - " << p << endl;
|
---|
973 | }
|
---|
974 | }
|
---|
975 | }
|
---|
976 | }
|
---|
977 | ij = p.lastSuffixIndex + 1;
|
---|
978 | }
|
---|
979 | outPhrase.close();
|
---|
980 |
|
---|
981 | // REMAINING PASSES
|
---|
982 | // The previous outPhrase file forms the input to each new pass
|
---|
983 | cellcount start, length;
|
---|
984 | while (outPhraseCounter > 0) {
|
---|
985 |
|
---|
986 | // Start a new pass
|
---|
987 | phrasePass++;
|
---|
988 | if (verbosity) {
|
---|
989 | cout << "Starting pass " << phrasePass << endl;
|
---|
990 | }
|
---|
991 |
|
---|
992 | // Open the input file
|
---|
993 | char inPhraseName[FILENAME_MAX];
|
---|
994 | sprintf(inPhraseName, "%s/outPhrase.%d", collection, phrasePass - 1);
|
---|
995 | ifstream inPhrase (inPhraseName, ios::in);
|
---|
996 | if (!inPhrase) {
|
---|
997 | cerr << "File " << inPhraseName << " could not be opened\n";
|
---|
998 | exit(1);
|
---|
999 | }
|
---|
1000 |
|
---|
1001 | // Open the output file
|
---|
1002 | sprintf(outPhraseName, "%s/outPhrase.%d", collection, phrasePass);
|
---|
1003 | outPhrase.open(outPhraseName, ios::out);
|
---|
1004 | if (!outPhrase) {
|
---|
1005 | cerr << "File " << outPhraseName << " could not be opened\n";
|
---|
1006 | exit(1);
|
---|
1007 | }
|
---|
1008 | outPhraseCounter = 0;
|
---|
1009 |
|
---|
1010 | // Process each phrase
|
---|
1011 | while(inPhrase >> start >> length) {
|
---|
1012 |
|
---|
1013 | // Ignore the phrase if we have expanded it before
|
---|
1014 | if (isPhraseStored(start, length))
|
---|
1015 | continue;
|
---|
1016 |
|
---|
1017 | // Remember that we have examined this phrase
|
---|
1018 | rememberThisPhrase(start, length);
|
---|
1019 |
|
---|
1020 | // Find the phrase in the suffixarray
|
---|
1021 | p = Phrase(suffixArray[start], length, SUFFIX);
|
---|
1022 | p.findFirstAndLastSuffix(start, inputLength-1);
|
---|
1023 |
|
---|
1024 | // Ignore the phrase if it only occurs once
|
---|
1025 | if (p.suffixFrequency < 2)
|
---|
1026 | continue;
|
---|
1027 |
|
---|
1028 | // Write the phrase text;
|
---|
1029 | phraseData << start << "-" << length << ":" << p << ":" << p.suffixFrequency << ":";
|
---|
1030 |
|
---|
1031 | // Expand the phrase, if it is fewer than 8 words long
|
---|
1032 | if (length <= 8) {
|
---|
1033 |
|
---|
1034 | // Get the minimal expansions for this phrase
|
---|
1035 | getExpansions(p, result);
|
---|
1036 |
|
---|
1037 | // write the results
|
---|
1038 | phraseData << result.size() << ":";
|
---|
1039 |
|
---|
1040 | for (cellcount i = 0; i < result.size(); i++) {
|
---|
1041 | if (i) {
|
---|
1042 | phraseData << ",";
|
---|
1043 | }
|
---|
1044 | phraseData << result[i].firstSuffixIndex << "-" << result[i].length;
|
---|
1045 | outPhrase << result[i].firstSuffixIndex << " " << result[i].length << endl;
|
---|
1046 | outPhraseCounter++;
|
---|
1047 | }
|
---|
1048 | result.clear();
|
---|
1049 |
|
---|
1050 | } else {
|
---|
1051 | // phrase is too long to expand further
|
---|
1052 | phraseData << "0:";
|
---|
1053 | }
|
---|
1054 |
|
---|
1055 | // Write the documents in which this phrase occurs
|
---|
1056 | df = getDocumentOccurrances(p, documentFrequency);
|
---|
1057 | phraseData << ":" << df << ":";
|
---|
1058 |
|
---|
1059 | // write the documents
|
---|
1060 | for (cellcount i = 0, first = 1; i < numberOfDocuments; i++) {
|
---|
1061 | if (documentFrequency[i]) {
|
---|
1062 | if (first) {
|
---|
1063 | first = 0;
|
---|
1064 | } else {
|
---|
1065 | phraseData << ";";
|
---|
1066 | }
|
---|
1067 | // Output the document number. Note that here we've numbered the
|
---|
1068 | // N documents from 0 to N-1, but later they'll be 1-N. Thus we
|
---|
1069 | // add 1 to the document id when we output it.
|
---|
1070 | phraseData << "d" << (i+1);
|
---|
1071 | // Next, output the frequency with which the document occurs, but
|
---|
1072 | // only if it is > 1.
|
---|
1073 | if (documentFrequency[i] > 1) {
|
---|
1074 | phraseData << "," << documentFrequency[i];
|
---|
1075 | }
|
---|
1076 | }
|
---|
1077 | }
|
---|
1078 |
|
---|
1079 | phraseData << endl;
|
---|
1080 | phraseCounter++;
|
---|
1081 |
|
---|
1082 | // feedback
|
---|
1083 | if (verbosity) {
|
---|
1084 | if (phraseCounter % 1000 == 0) {
|
---|
1085 | cout << "phrase " << phraseCounter << ": "<< "start " << start
|
---|
1086 | << ", length " << length << " - " << p << endl;
|
---|
1087 | }
|
---|
1088 | }
|
---|
1089 |
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | inPhrase.close();
|
---|
1093 | outPhrase.close();
|
---|
1094 | }
|
---|
1095 |
|
---|
1096 | phraseData.close();
|
---|
1097 | deletePhraseMemory();
|
---|
1098 |
|
---|
1099 | delete [] documentFrequency;
|
---|
1100 | delete [] symbols;
|
---|
1101 | delete [] suffixArray;
|
---|
1102 | delete [] prefixArray;
|
---|
1103 | delete [] suffixCheck;
|
---|
1104 | delete [] documentArray;
|
---|
1105 |
|
---|
1106 |
|
---|
1107 |
|
---|
1108 | cout << endl << "Done: " << phraseCounter << " phrases in " << phraseDataName << endl;
|
---|
1109 | return 0;
|
---|
1110 | }
|
---|
1111 |
|
---|
1112 |
|
---|
1113 |
|
---|
1114 |
|
---|
1115 |
|
---|