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1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\ |
2 | * This is GNU Go, a Go program. Contact gnugo@gnu.org, or see * | |
3 | * http://www.gnu.org/software/gnugo/ for more information. * | |
4 | * * | |
5 | * Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, * | |
6 | * 2008 and 2009 by the Free Software Foundation. * | |
7 | * * | |
8 | * This program is free software; you can redistribute it and/or * | |
9 | * modify it under the terms of the GNU General Public License as * | |
10 | * published by the Free Software Foundation - version 3 or * | |
11 | * (at your option) any later version. * | |
12 | * * | |
13 | * This program is distributed in the hope that it will be useful, * | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
16 | * GNU General Public License in file COPYING for more details. * | |
17 | * * | |
18 | * You should have received a copy of the GNU General Public * | |
19 | * License along with this program; if not, write to the Free * | |
20 | * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * | |
21 | * Boston, MA 02111, USA. * | |
22 | \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
23 | ||
24 | ||
25 | /* The functions in this file implement a mechanism whereby | |
26 | * GNU Go can fork a second gnugo process, called the oracle. | |
27 | * The two processes communicate by means of the GTP. | |
28 | * The functions oracle_trymove() and oracle_popgo() call | |
29 | * trymove and popgo in the primary gnugo processes but | |
30 | * actually play and undo the move in the oracle. This | |
31 | * the oracle can be queried for information which is | |
32 | * normally only available at the top level. | |
33 | */ | |
34 | ||
35 | #include "config.h" | |
36 | ||
37 | #if ORACLE | |
38 | ||
39 | #include "gnugo.h" | |
40 | #include "liberty.h" | |
41 | #include "patterns.h" | |
42 | ||
43 | #include <stdio.h> | |
44 | #include <unistd.h> | |
45 | #include <string.h> | |
46 | #include <stdlib.h> | |
47 | #include <stdarg.h> | |
48 | ||
49 | #define USE_POSIX 1 | |
50 | ||
51 | FILE *to_gnugo_stream, *from_gnugo_stream; | |
52 | char gnugo_line[128]; | |
53 | int gnugo_line_length; | |
54 | ||
55 | int pfd_a[2]; | |
56 | int pfd_b[2]; | |
57 | ||
58 | #define TELL_ORACLE(x, args...) do { \ | |
59 | if (debug & DEBUG_ORACLE_STREAM) fprintf(stderr, x, ##args); \ | |
60 | if (fprintf(to_gnugo_stream, x, ##args) < 0) \ | |
61 | error("can't write command in to_gnugo_stream"); \ | |
62 | fflush(to_gnugo_stream); \ | |
63 | } while (0) | |
64 | ||
65 | #define ASK_ORACLE do { \ | |
66 | gnugo_line_length = 0; \ | |
67 | while (gnugo_line_length != 1) { \ | |
68 | if (!fgets(gnugo_line, 128, from_gnugo_stream)) \ | |
69 | error("can't get response"); \ | |
70 | gnugo_line_length = strlen(gnugo_line); \ | |
71 | if (debug & DEBUG_ORACLE_STREAM) \ | |
72 | fprintf(stderr, gnugo_line); \ | |
73 | } \ | |
74 | } while (0) | |
75 | ||
76 | #define MAX_ORACLE_MOVES 10 | |
77 | ||
78 | struct oracle_move_data { | |
79 | int pos; /* move coordinate */ | |
80 | int color; /* color to play */ | |
81 | int value; /* value */ | |
82 | int ab_value; /* alpha-beta value */ | |
83 | const char *reason; /* why this move */ | |
84 | }; | |
85 | ||
86 | static void oracle_callback(int anchor, int color, struct pattern *pattern, | |
87 | int ll, void *data); | |
88 | static void oracle_add_move(struct oracle_move_data *moves, | |
89 | int this_move, int this_value, | |
90 | const char *this_reason); | |
91 | void do_consult_oracle(int color); | |
92 | void error(const char *msg); | |
93 | static int oracle_trymove(int pos, int color, const char *message, int str, | |
94 | int komaster, int kom_pos); | |
95 | static void oracle_popgo(void); | |
96 | static void tell_oracle(const char *fmt, ...); | |
97 | static void ask_oracle(void); | |
98 | static int search_width(void); | |
99 | ||
100 | ||
101 | /*** * *** * *** * *** * *** * *** * *** * *** * *** * *** * *** * ***\ | |
102 | * Primary Oracle Functions * | |
103 | \*** * *** * *** * *** * *** * *** * *** * *** * *** * *** * *** * ***/ | |
104 | ||
105 | /* Forks and attaches pipes to a new GNU Go process in gtp mode. | |
106 | * Loads the sgf file | |
107 | */ | |
108 | ||
109 | void | |
110 | summon_oracle(void) | |
111 | { | |
112 | if (pipe(pfd_a) == -1) | |
113 | error("can't open pipe a"); | |
114 | if (pipe(pfd_b) == -1) | |
115 | error("can't open pipe b"); | |
116 | switch (fork()) { | |
117 | case -1: | |
118 | error("fork failed (try chopsticks)"); | |
119 | case 0: | |
120 | /* Attach pipe a to stdin */ | |
121 | if (dup2(pfd_a[0], 0) == -1) | |
122 | error("dup pfd_a[0] failed"); | |
123 | /* attach pipe b to stdout" */ | |
124 | if (dup2(pfd_b[1], 1) == -1) | |
125 | error("dup pfd_b[1] failed"); | |
126 | execlp("gnugo", "gnugo", "--mode", "gtp", "--quiet", NULL); | |
127 | error("execlp failed"); | |
128 | } | |
129 | oracle_exists = 1; | |
130 | /* Attach pipe a to to_gnugo_stream */ | |
131 | to_gnugo_stream = (FILE *) fdopen(pfd_a[1], "w"); | |
132 | /* Attach pipe b to from_gnugo_stream */ | |
133 | from_gnugo_stream = (FILE *) fdopen(pfd_b[0], "r"); | |
134 | } | |
135 | ||
136 | /* load an sgf file */ | |
137 | ||
138 | void | |
139 | oracle_loadsgf(char *infilename, char *untilstring) | |
140 | { | |
141 | if (untilstring) | |
142 | TELL_ORACLE("loadsgf %s %s\n", infilename, untilstring); | |
143 | else | |
144 | TELL_ORACLE("loadsgf %s\n", infilename); | |
145 | ASK_ORACLE; | |
146 | fflush(to_gnugo_stream); | |
147 | gnugo_line_length = 0; | |
148 | } | |
149 | ||
150 | /* Tell the oracle to go away. */ | |
151 | ||
152 | void | |
153 | dismiss_oracle(void) | |
154 | { | |
155 | if (oracle_exists) | |
156 | TELL_ORACLE("quit\n"); | |
157 | oracle_exists = 0; | |
158 | } | |
159 | ||
160 | /* complain and die! */ | |
161 | ||
162 | void | |
163 | error(const char *msg) | |
164 | { | |
165 | fprintf(stderr, "oracle: %s\n", msg); | |
166 | abort(); | |
167 | } | |
168 | ||
169 | /* Call trymove in the primary process, and have the oracle actually | |
170 | * play the move. | |
171 | */ | |
172 | static int | |
173 | oracle_trymove(int pos, int color, const char *message, int str, | |
174 | int komaster, int kom_pos) | |
175 | { | |
176 | if (!trymove(pos, color, message, str)) | |
177 | return 0; | |
178 | if (debug & DEBUG_ORACLE_STREAM) | |
179 | gfprintf(stderr, "%o%s %1m\n", | |
180 | color == BLACK ? "black" : "white", pos); | |
181 | gfprintf(to_gnugo_stream, "%o%s %1m\n", | |
182 | color == BLACK ? "black" : "white", pos); | |
183 | fflush(to_gnugo_stream); | |
184 | ASK_ORACLE; | |
185 | return 1; | |
186 | } | |
187 | ||
188 | /* Undo the move. | |
189 | */ | |
190 | static void | |
191 | oracle_popgo(void) | |
192 | { | |
193 | popgo(); | |
194 | TELL_ORACLE("undo\n"); | |
195 | ASK_ORACLE; | |
196 | } | |
197 | ||
198 | /* Play the move. | |
199 | */ | |
200 | ||
201 | int | |
202 | oracle_play_move(int pos, int color) | |
203 | { | |
204 | play_move(pos, color); | |
205 | ||
206 | if (debug & DEBUG_ORACLE_STREAM) | |
207 | gfprintf(stderr, "%o%s %1m\n", | |
208 | color == BLACK ? "black" : "white", pos); | |
209 | gfprintf(to_gnugo_stream, "%o%s %1m\n", | |
210 | color == BLACK ? "black" : "white", pos); | |
211 | fflush(to_gnugo_stream); | |
212 | ASK_ORACLE; | |
213 | return 1; | |
214 | } | |
215 | ||
216 | /* FIXME: Debugging needed. This variadic function doesn't work right if we | |
217 | * try to pass a const *char argument, like the infilename in | |
218 | * oracle_loadsgf. So for the time being we stick with the variadic macro | |
219 | * TELL_ORACLE. | |
220 | */ | |
221 | static void | |
222 | tell_oracle(const char *fmt, ...) | |
223 | { | |
224 | va_list ap; | |
225 | va_start(ap, fmt); | |
226 | if (debug & DEBUG_ORACLE_STREAM) fprintf(stderr, fmt, ap); | |
227 | if (fprintf(to_gnugo_stream, fmt, ap) < 0) | |
228 | error("can't write command in to_gnugo_stream"); | |
229 | fflush(to_gnugo_stream); | |
230 | va_end(ap); | |
231 | } | |
232 | ||
233 | /* FIXME: Debugging needed. This variadic function seems a little more | |
234 | * reliable than the corresponding variadic macro ASK_ORACLE. | |
235 | */ | |
236 | ||
237 | static void | |
238 | ask_oracle(void) | |
239 | { | |
240 | int line_length = 0; | |
241 | char line[128]; | |
242 | ||
243 | while (line_length != 1) { | |
244 | if (!fgets(line, 128, from_gnugo_stream)) | |
245 | error("can't get response"); | |
246 | line_length = strlen(line); | |
247 | if (line_length > 1 | |
248 | && (line[0] == '=' || line[0] == '?')) | |
249 | strncpy(gnugo_line, line, 128); | |
250 | if (debug & DEBUG_ORACLE_STREAM) { | |
251 | fprintf(stderr, line); | |
252 | fflush(stderr); | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
257 | ||
258 | /* clear the oracle's board and set the boardsize */ | |
259 | ||
260 | void | |
261 | oracle_clear_board(int boardsize) | |
262 | { | |
263 | TELL_ORACLE("boardsize %d\n", boardsize); | |
264 | ASK_ORACLE; | |
265 | } | |
266 | ||
267 | /*** * *** * *** * *** * *** * *** * *** * *** * *** * *** * *** * ***\ | |
268 | * Demonstration: a pattern matcher * | |
269 | \*** * *** * *** * *** * *** * *** * *** * *** * *** * *** * *** * ***/ | |
270 | ||
271 | /* Call the pattern matcher */ | |
272 | ||
273 | void | |
274 | consult_oracle(int color) | |
275 | { | |
276 | do_consult_oracle(color); | |
277 | } | |
278 | ||
279 | void | |
280 | do_consult_oracle(int color) | |
281 | { | |
282 | struct oracle_move_data oracle_moves[MAX_ORACLE_MOVES]; | |
283 | int k; | |
284 | ||
285 | for (k = 0; k < MAX_ORACLE_MOVES; k++) | |
286 | oracle_moves[k].value = -1; | |
287 | ||
288 | matchpat(oracle_callback, color, &oracle_db, oracle_moves, NULL); | |
289 | for (k = 0; k < MAX_ORACLE_MOVES; k++) | |
290 | if (oracle_moves[k].value > -1) { | |
291 | oracle_trymove(oracle_moves[k].pos, color, oracle_moves[k].reason, | |
292 | 0, 0, NO_MOVE); | |
293 | do_consult_oracle(OTHER_COLOR(color)); | |
294 | oracle_popgo(); | |
295 | } | |
296 | } | |
297 | ||
298 | static void | |
299 | oracle_callback(int anchor, int color, struct pattern *pattern, | |
300 | int ll, void *data) | |
301 | { | |
302 | int this_move; | |
303 | struct oracle_move_data *moves = data; | |
304 | UNUSED(color); | |
305 | ||
306 | this_move = AFFINE_TRANSFORM(pattern->move_offset, ll, anchor); | |
307 | if (within_search_area(this_move)) | |
308 | oracle_add_move(moves, this_move, pattern->value, pattern->name); | |
309 | else | |
310 | gprintf("outside the area\n"); | |
311 | } | |
312 | ||
313 | /* Add a move to a list */ | |
314 | ||
315 | static void | |
316 | oracle_add_move(struct oracle_move_data moves[MAX_ORACLE_MOVES], | |
317 | int this_move, int this_value, const char *this_reason) | |
318 | { | |
319 | int k, l; | |
320 | ||
321 | for (k = 0; k < MAX_ORACLE_MOVES; k++) | |
322 | if (moves[k].value == -1 | |
323 | || this_value >= moves[k].value) | |
324 | break; | |
325 | for (l = MAX_ORACLE_MOVES-1; l > k; l--) { | |
326 | moves[l].pos = moves[l-1].pos; | |
327 | moves[l].value = moves[l-1].value; | |
328 | moves[l].reason = moves[l-1].reason; | |
329 | } | |
330 | moves[k].pos = this_move; | |
331 | moves[k].value = this_value; | |
332 | moves[k].reason = this_reason; | |
333 | } | |
334 | ||
335 | /*** * *** * *** * *** * *** * *** * *** * *** * *** * *** * *** * ***\ | |
336 | * Demonstration: metamachine * | |
337 | \*** * *** * *** * *** * *** * *** * *** * *** * *** * *** * *** * ***/ | |
338 | ||
339 | #define FIRST_LEVEL_MOVES 3 | |
340 | #define SECOND_LEVEL_MOVES 2 | |
341 | ||
342 | static int | |
343 | do_metamachine_genmove(int color, int width, float *value); | |
344 | ||
345 | int | |
346 | metamachine_genmove(int color, float *value, int limit_search) | |
347 | { | |
348 | int move; | |
349 | int pos; | |
350 | ||
351 | if (limit_search) { | |
352 | TELL_ORACLE("limit_search 1\n"); | |
353 | ASK_ORACLE; | |
354 | for (pos = BOARDMIN; pos < BOARDMAX; pos++) | |
355 | if (within_search_area(pos)) { | |
356 | if (debug & DEBUG_ORACLE_STREAM) | |
357 | gfprintf(stderr, "%oset_search_limit %1m\n", pos); | |
358 | gfprintf(to_gnugo_stream, "%oset_search_limit %1m\n", pos); | |
359 | fflush(to_gnugo_stream); | |
360 | ASK_ORACLE; | |
361 | } | |
362 | } | |
363 | count_variations = 1; | |
364 | move = do_metamachine_genmove(color, search_width(), value); | |
365 | sgffile_enddump(outfilename); | |
366 | count_variations = 0; | |
367 | return move; | |
368 | } | |
369 | ||
370 | static int | |
371 | do_metamachine_genmove(int color, int width, float *value) | |
372 | { | |
373 | int k, moves_considered; | |
374 | float move_value[10]; | |
375 | float best_score = 0.; | |
376 | int best_move = -1; | |
377 | char *token; | |
378 | int moves[10]; | |
379 | float score[10]; | |
380 | char delimiters[] = " \t\r\n"; | |
381 | char buf[100]; | |
382 | int i, j; | |
383 | ||
384 | if (color == BLACK) | |
385 | TELL_ORACLE("top_moves_black\n"); | |
386 | else | |
387 | TELL_ORACLE("top_moves_white\n"); | |
388 | ask_oracle(); | |
389 | token = strtok(gnugo_line, delimiters); | |
390 | for (k = 0; k < 10; k++) { | |
391 | moves[k] = PASS_MOVE; | |
392 | move_value[k] = 0.0; | |
393 | } | |
394 | moves_considered = width; | |
395 | if (verbose) | |
396 | dump_stack(); | |
397 | for (k = 0; k < moves_considered; k++) { | |
398 | token = strtok(NULL, delimiters); | |
399 | if (!token) | |
400 | break; | |
401 | moves[k] = string_to_location(board_size, token); | |
402 | token = strtok(NULL, delimiters); | |
403 | if (!token) | |
404 | break; | |
405 | sscanf(token, "%f", move_value + k); | |
406 | TRACE("move %d: %1m valued %f\n", k, moves[k], move_value[k]); | |
407 | } | |
408 | /* if we left the loop early, k is the number of valid moves */ | |
409 | moves_considered = k; | |
410 | if (moves_considered == 0) { | |
411 | *value = 0.0; | |
412 | return PASS_MOVE; | |
413 | } | |
414 | if (moves_considered == 1) { | |
415 | *value = 1.0; | |
416 | return moves[k]; | |
417 | } | |
418 | for (k = 0; k < moves_considered; k++) { | |
419 | if (oracle_trymove(moves[k], color, "", 0, 0, NO_MOVE)) { | |
420 | int new_width = search_width(); | |
421 | ||
422 | if (new_width == 0) { | |
423 | TELL_ORACLE("experimental_score %s\n", | |
424 | color == BLACK ? "black" : "white"); | |
425 | ask_oracle(); | |
426 | sscanf(gnugo_line, "= %f", score + k); | |
427 | } | |
428 | else { | |
429 | do_metamachine_genmove(OTHER_COLOR(color), new_width, &score[k]); | |
430 | } | |
431 | if (verbose) | |
432 | dump_stack(); | |
433 | TRACE("score: %f\n", color == WHITE ? score[k] : -score[k]); | |
434 | sprintf(buf, "value %.2f", color == WHITE ? score[k] : -score[k]); | |
435 | if (sgf_dumptree) | |
436 | sgftreeAddComment(sgf_dumptree, buf); | |
437 | oracle_popgo(); | |
438 | } | |
439 | if (best_move == -1 | |
440 | || (color == WHITE && score[k] > best_score) | |
441 | || (color == BLACK && score[k] < best_score)) { | |
442 | best_move = k; | |
443 | best_score = score[k]; | |
444 | } | |
445 | } | |
446 | TRACE("best: %f at %1m\n", best_score, moves[best_move]); | |
447 | *value = score[best_move]; | |
448 | return moves[best_move]; | |
449 | } | |
450 | ||
451 | /* decide how wide to search */ | |
452 | ||
453 | static int | |
454 | search_width(void) | |
455 | { | |
456 | if (stackp == 0) | |
457 | return 3; | |
458 | else if (stackp == 1) | |
459 | return 2; | |
460 | else | |
461 | return 0; | |
462 | } | |
463 | ||
464 | ||
465 | #endif | |
466 | ||
467 | ||
468 | ||
469 | /* | |
470 | * Local Variables: | |
471 | * tab-width: 8 | |
472 | * c-basic-offset: 2 | |
473 | * End: | |
474 | */ |