| 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 | */ |