pattern.c

   1 #define DEBUG
   2 #include <assert.h>
   3 #include <ctype.h>
   4 #include <inttypes.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7
   8 #include "board.h"
   9 #include "debug.h"
  10 #include "pattern.h"
  11 #include "patternsp.h"
  12 #include "pattern3.h"
  13 #include "tactics.h"
  14
  15
  16 struct pattern_config DEFAULT_PATTERN_CONFIG = {
  17         .spat_min = 3, .spat_max = MAX_PATTERN_DIST,
  18         .bdist_max = 4,
  19         .ldist_min = 0, .ldist_max = 256,
  20         .mcsims = 0, /* Unsupported. */
  21 };
  22
  23 struct pattern_config FAST_PATTERN_CONFIG = {
  24         .spat_min = 3, .spat_max = 3,
  25         .bdist_max = -1,
  26         .ldist_min = 0, .ldist_max = 256,
  27         .mcsims = 0,
  28 };
  29
  30 pattern_spec PATTERN_SPEC_MATCHALL = {
  31         [FEAT_PASS] = ~0,
  32         [FEAT_CAPTURE] = ~0,
  33         [FEAT_AESCAPE] = ~0,
  34         [FEAT_SELFATARI] = ~0,
  35         [FEAT_ATARI] = ~0,
  36         [FEAT_BORDER] = ~0,
  37         [FEAT_LDIST] = ~0,
  38         [FEAT_LLDIST] = ~0,
  39         [FEAT_CONTIGUITY] = 0,
  40         [FEAT_SPATIAL] = ~0,
  41         [FEAT_PATTERN3] = 0,
  42         [FEAT_MCOWNER] = ~0,
  43 };
  44
  45 #define FAST_NO_LADDER 1 /* 1: Don't match ladders in fast playouts */
  46 pattern_spec PATTERN_SPEC_MATCHFAST = {
  47         [FEAT_PASS] = ~0,
  48         [FEAT_CAPTURE] = ~(1<<PF_CAPTURE_ATARIDEF | 1<<PF_CAPTURE_RECAPTURE | FAST_NO_LADDER<<PF_CAPTURE_LADDER),
  49         [FEAT_AESCAPE] = ~(FAST_NO_LADDER<<PF_AESCAPE_LADDER),
  50         [FEAT_SELFATARI] = ~(1<<PF_SELFATARI_SMART),
  51         [FEAT_ATARI] = ~(FAST_NO_LADDER<<PF_ATARI_LADDER),
  52         [FEAT_BORDER] = 0,
  53         [FEAT_LDIST] = 0,
  54         [FEAT_LLDIST] = 0,
  55         [FEAT_CONTIGUITY] = ~0,
  56         [FEAT_SPATIAL] = 0,
  57         [FEAT_PATTERN3] = ~0,
  58         [FEAT_MCOWNER] = 0,
  59 };
  60
  61 static const struct feature_info {
  62         char *name;
  63         int payloads;
  64 } features[FEAT_MAX] = {
  65         [FEAT_PASS] = { .name = "pass", .payloads = 2 },
  66         [FEAT_CAPTURE] = { .name = "capture", .payloads = 16 },
  67         [FEAT_AESCAPE] = { .name = "atariescape", .payloads = 2 },
  68         [FEAT_SELFATARI] = { .name = "selfatari", .payloads = 2 },
  69         [FEAT_ATARI] = { .name = "atari", .payloads = 4 },
  70         [FEAT_BORDER] = { .name = "border", .payloads = -1 },
  71         [FEAT_LDIST] = { .name = "ldist", .payloads = -1 },
  72         [FEAT_LLDIST] = { .name = "lldist", .payloads = -1 },
  73         [FEAT_CONTIGUITY] = { .name = "cont", .payloads = 2 },
  74         [FEAT_SPATIAL] = { .name = "s", .payloads = -1 },
  75         [FEAT_PATTERN3] = { .name = "p", .payloads = 2<<16 },
  76         [FEAT_MCOWNER] = { .name = "mcowner", .payloads = 16 },
  77 };
  78
  79 char *
  80 feature2str(char *str, struct feature *f)
  81 {
  82         return str + sprintf(str + strlen(str), "%s:%d", features[f->id].name, f->payload);
  83 }
  84
  85 char *
  86 str2feature(char *str, struct feature *f)
  87 {
  88         while (isspace(*str)) str++;
  89
  90         int flen = strcspn(str, ":");
  91         for (int i = 0; i < sizeof(features)/sizeof(features[0]); i++)
  92                 if (strlen(features[i].name) == flen && !strncmp(features[i].name, str, flen)) {
  93                         f->id = i;
  94                         goto found;
  95                 }
  96         fprintf(stderr, "invalid featurespec: %s[%d]\n", str, flen);
  97         exit(EXIT_FAILURE);
  98
  99 found:
 100         str += flen + 1;
 101         f->payload = strtoull(str, &str, 10);
 102         return str;
 103 }
 104
 105 char *
 106 feature_name(enum feature_id f)
 107 {
 108         return features[f].name;
 109 }
 110
 111 int
 112 feature_payloads(struct pattern_config *pc, enum feature_id f)
 113 {
 114         switch (f) {
 115                 case FEAT_SPATIAL:
 116                         assert(features[f].payloads < 0);
 117                         return pc->spat_dict->nspatials;
 118                 case FEAT_LDIST:
 119                 case FEAT_LLDIST:
 120                         assert(features[f].payloads < 0);
 121                         return pc->ldist_max + 1;
 122                 case FEAT_BORDER:
 123                         assert(features[f].payloads < 0);
 124                         return pc->bdist_max + 1;
 125                 default:
 126                         assert(features[f].payloads > 0);
 127                         return features[f].payloads;
 128         }
 129 }
 130
 131
 132 /* pattern_spec helpers */
 133 #define PS_ANY(F) (ps[FEAT_ ## F] & (1 << 15))
 134 #define PS_PF(F, P) (ps[FEAT_ ## F] & (1 << PF_ ## F ## _ ## P))
 135
 136 static struct feature *
 137 pattern_match_capture(struct pattern_config *pc, pattern_spec ps,
 138                       struct pattern *p, struct feature *f,
 139                       struct board *b, struct move *m)
 140 {
 141         f->id = FEAT_CAPTURE; f->payload = 0;
 142 #ifdef BOARD_TRAITS
 143         if (!trait_at(b, m->coord, m->color).cap)
 144                 return f;
 145         /* Capturable! */
 146         if (!(PS_PF(CAPTURE, LADDER)
 147               || PS_PF(CAPTURE, RECAPTURE)
 148               || PS_PF(CAPTURE, ATARIDEF)
 149               || PS_PF(CAPTURE, KO))) {
 150                 (f++, p->n++);
 151                 return f;
 152         }
 153 #endif
 154
 155         /* Ok, we need to look at the neighbors anyway. */
 156         /* Furthermore, we will now create one feature per capturable
 157          * neighbor. */
 158         /* XXX: I'm not sure if this is really good idea. --pasky */
 159         foreach_neighbor(b, m->coord, {
 160                 if (board_at(b, c) != stone_other(m->color))
 161                         continue;
 162                 group_t g = group_at(b, c);
 163                 if (!g || board_group_info(b, g).libs != 1)
 164                         continue;
 165
 166                 /* Capture! */
 167
 168                 if (PS_PF(CAPTURE, LADDER))
 169                         f->payload |= is_ladder(b, m->coord, g, true, true) << PF_CAPTURE_LADDER;
 170                 /* TODO: is_ladder() is too conservative in some
 171                  * very obvious situations, look at complete.gtp. */
 172
 173                 /* TODO: PF_CAPTURE_RECAPTURE */
 174
 175                 if (PS_PF(CAPTURE, ATARIDEF))
 176                 foreach_in_group(b, g) {
 177                         foreach_neighbor(b, c, {
 178                                 assert(board_at(b, c) != S_NONE || c == m->coord);
 179                                 if (board_at(b, c) != m->color)
 180                                         continue;
 181                                 group_t g = group_at(b, c);
 182                                 if (!g || board_group_info(b, g).libs != 1)
 183                                         continue;
 184                                 /* A neighboring group of ours is in atari. */
 185                                 f->payload |= 1 << PF_CAPTURE_ATARIDEF;
 186                         });
 187                 } foreach_in_group_end;
 188
 189                 if (PS_PF(CAPTURE, KO)
 190                     && group_is_onestone(b, g)
 191                     && neighbor_count_at(b, m->coord, stone_other(m->color))
 192                        + neighbor_count_at(b, m->coord, S_OFFBOARD) == 4)
 193                         f->payload |= 1 << PF_CAPTURE_KO;
 194
 195                 (f++, p->n++);
 196                 f->id = FEAT_CAPTURE; f->payload = 0;
 197         });
 198         return f;
 199 }
 200
 201 static struct feature *
 202 pattern_match_aescape(struct pattern_config *pc, pattern_spec ps,
 203                       struct pattern *p, struct feature *f,
 204                       struct board *b, struct move *m)
 205 {
 206         /* Find if a neighboring group of ours is in atari, AND that we provide
 207          * a liberty to connect out. XXX: No connect-and-die check. */
 208         group_t in_atari = -1;
 209         bool has_extra_lib = false;
 210         int payload = 0;
 211
 212         foreach_neighbor(b, m->coord, {
 213                 if (board_at(b, c) != m->color) {
 214                         if (board_at(b, c) == S_NONE)
 215                                 has_extra_lib = true; // free point
 216                         else if (board_at(b, c) == stone_other(m->color) && board_group_info(b, group_at(b, c)).libs == 1)
 217                                 has_extra_lib = true; // capturable enemy group
 218                         continue;
 219                 }
 220                 group_t g = group_at(b, c); assert(g);
 221                 if (board_group_info(b, g).libs != 1) {
 222                         has_extra_lib = true;
 223                         continue;
 224                 }
 225
 226                 /* In atari! */
 227                 in_atari = g;
 228
 229                 if (PS_PF(AESCAPE, LADDER))
 230                         payload |= is_ladder(b, m->coord, g, true, true) << PF_AESCAPE_LADDER;
 231                 /* TODO: is_ladder() is too conservative in some
 232                  * very obvious situations, look at complete.gtp. */
 233         });
 234         if (in_atari >= 0 && has_extra_lib) {
 235                 f->id = FEAT_AESCAPE; f->payload = payload;
 236                 (f++, p->n++);
 237         }
 238         return f;
 239 }
 240
 241 static struct feature *
 242 pattern_match_atari(struct pattern_config *pc, pattern_spec ps,
 243                     struct pattern *p, struct feature *f,
 244                     struct board *b, struct move *m)
 245 {
 246         foreach_neighbor(b, m->coord, {
 247                 if (board_at(b, c) != stone_other(m->color))
 248                         continue;
 249                 group_t g = group_at(b, c);
 250                 if (!g || board_group_info(b, g).libs != 2)
 251                         continue;
 252
 253                 /* Can atari! */
 254                 f->id = FEAT_ATARI; f->payload = 0;
 255
 256                 if (PS_PF(ATARI, LADDER)) {
 257                         /* Opponent will escape by the other lib. */
 258                         coord_t lib = board_group_info(b, g).lib[0];
 259                         if (lib == m->coord) lib = board_group_info(b, g).lib[1];
 260                         /* TODO: is_ladder() is too conservative in some
 261                          * very obvious situations, look at complete.gtp. */
 262                         f->payload |= is_ladder(b, lib, g, true, true) << PF_ATARI_LADDER;
 263                 }
 264
 265                 if (PS_PF(ATARI, KO) && !is_pass(b->ko.coord))
 266                         f->payload |= 1 << PF_ATARI_KO;
 267
 268                 (f++, p->n++);
 269         });
 270         return f;
 271 }
 272
 273 #ifndef BOARD_SPATHASH
 274 #undef BOARD_SPATHASH_MAXD
 275 #define BOARD_SPATHASH_MAXD 1
 276 #endif
 277
 278 /* Match spatial features that are too distant to be pre-matched
 279  * incrementally. */
 280 struct feature *
 281 pattern_match_spatial_outer(struct pattern_config *pc, pattern_spec ps,
 282                             struct pattern *p, struct feature *f,
 283                             struct board *b, struct move *m, hash_t h)
 284 {
 285         /* We record all spatial patterns black-to-play; simply
 286          * reverse all colors if we are white-to-play. */
 287         static enum stone bt_black[4] = { S_NONE, S_BLACK, S_WHITE, S_OFFBOARD };
 288         static enum stone bt_white[4] = { S_NONE, S_WHITE, S_BLACK, S_OFFBOARD };
 289         enum stone (*bt)[4] = m->color == S_WHITE ? &bt_white : &bt_black;
 290
 291         for (int d = BOARD_SPATHASH_MAXD + 1; d <= pc->spat_max; d++) {
 292                 /* Recompute missing outer circles:
 293                  * Go through all points in given distance. */
 294                 for (int j = ptind[d]; j < ptind[d + 1]; j++) {
 295                         ptcoords_at(x, y, m->coord, b, j);
 296                         h ^= pthashes[0][j][(*bt)[board_atxy(b, x, y)]];
 297                 }
 298                 if (d < pc->spat_min)
 299                         continue;
 300                 /* Record spatial feature, one per distance. */
 301                 int sid = spatial_dict_get(pc->spat_dict, d, h & spatial_hash_mask);
 302                 if (sid > 0) {
 303                         f->id = FEAT_SPATIAL;
 304                         f->payload = sid;
 305                         (f++, p->n++);
 306                 } /* else not found, ignore */
 307         }
 308         return f;
 309 }
 310
 311 struct feature *
 312 pattern_match_spatial(struct pattern_config *pc, pattern_spec ps,
 313                       struct pattern *p, struct feature *f,
 314                       struct board *b, struct move *m)
 315 {
 316         /* XXX: This is partially duplicated from spatial_from_board(), but
 317          * we build a hash instead of spatial record. */
 318
 319         assert(pc->spat_min > 0);
 320
 321         hash_t h = pthashes[0][0][S_NONE];
 322 #ifdef BOARD_SPATHASH
 323         bool w_to_play = m->color == S_WHITE;
 324         for (int d = 2; d <= BOARD_SPATHASH_MAXD; d++) {
 325                 /* Reuse all incrementally matched data. */
 326                 h ^= b->spathash[m->coord][d - 1][w_to_play];
 327                 if (d < pc->spat_min)
 328                         continue;
 329                 /* Record spatial feature, one per distance. */
 330                 int sid = spatial_dict_get(pc->spat_dict, d, h & spatial_hash_mask);
 331                 if (sid > 0) {
 332                         f->id = FEAT_SPATIAL;
 333                         f->payload = sid;
 334                         (f++, p->n++);
 335                 } /* else not found, ignore */
 336         }
 337 #else
 338         assert(BOARD_SPATHASH_MAXD < 2);
 339 #endif
 340         if (unlikely(pc->spat_max > BOARD_SPATHASH_MAXD))
 341                 f = pattern_match_spatial_outer(pc, ps, p, f, b, m, h);
 342         return f;
 343 }
 344
 345
 346 static bool
 347 is_simple_selfatari(struct board *b, enum stone color, coord_t coord)
 348 {
 349         /* Very rough check, no connect-and-die checks or other trickery. */
 350         int libs = immediate_liberty_count(b, coord);
 351         if (libs >= 2) return false; // open space
 352
 353         group_t seen = -1;
 354         foreach_neighbor(b, coord, {
 355                 if (board_at(b, c) == stone_other(color) && board_group_info(b, group_at(b, c)).libs == 1) {
 356                         return false; // can capture
 357
 358                 } else if (board_at(b, c) == color) {
 359                         // friendly group, does it have liberties?
 360                         group_t g = group_at(b, c);
 361                         if (board_group_info(b, g).libs == 1 || seen == g)
 362                                 continue;
 363                         libs += board_group_info(b, g).libs - 1;
 364                         if (libs >= 2) return false;
 365                         // don't consider the same group twice
 366                         seen = g;
 367                 }
 368         });
 369         return true;
 370 }
 371
 372 void
 373 pattern_match(struct pattern_config *pc, pattern_spec ps,
 374               struct pattern *p, struct board *b, struct move *m)
 375 {
 376         p->n = 0;
 377         struct feature *f = &p->f[0];
 378
 379         /* TODO: We should match pretty much all of these features
 380          * incrementally. */
 381
 382         if (is_pass(m->coord)) {
 383                 if (PS_ANY(PASS)) {
 384                         f->id = FEAT_PASS; f->payload = 0;
 385                         if (PS_PF(PASS, LASTPASS))
 386                                 f->payload |= (b->moves > 0 && is_pass(b->last_move.coord))
 387                                                 << PF_PASS_LASTPASS;
 388                         p->n++;
 389                 }
 390                 return;
 391         }
 392
 393         if (PS_ANY(CAPTURE)) {
 394                 f = pattern_match_capture(pc, ps, p, f, b, m);
 395         }
 396
 397         if (PS_ANY(AESCAPE)) {
 398                 f = pattern_match_aescape(pc, ps, p, f, b, m);
 399         }
 400
 401         if (PS_ANY(SELFATARI)) {
 402                 bool simple = is_simple_selfatari(b, m->color, m->coord);
 403                 bool thorough = false;
 404                 if (PS_PF(SELFATARI, SMART)) {
 405                         thorough = is_bad_selfatari(b, m->color, m->coord);
 406                 }
 407                 if (simple || thorough) {
 408                         f->id = FEAT_SELFATARI;
 409                         f->payload = thorough << PF_SELFATARI_SMART;
 410                         (f++, p->n++);
 411                 }
 412         }
 413
 414         if (PS_ANY(ATARI)) {
 415                 f = pattern_match_atari(pc, ps, p, f, b, m);
 416         }
 417
 418         if (PS_ANY(BORDER)) {
 419                 int bdist = coord_edge_distance(m->coord, b);
 420                 if (bdist <= pc->bdist_max) {
 421                         f->id = FEAT_BORDER;
 422                         f->payload = bdist;
 423                         (f++, p->n++);
 424                 }
 425         }
 426
 427         if (PS_ANY(CONTIGUITY) && !is_pass(b->last_move.coord)
 428             && coord_is_8adjecent(m->coord, b->last_move.coord, b)) {
 429                 f->id = FEAT_CONTIGUITY;
 430                 f->payload = 1;
 431                 (f++, p->n++);
 432         }
 433
 434         if (PS_ANY(LDIST) && pc->ldist_max > 0 && !is_pass(b->last_move.coord)) {
 435                 int ldist = coord_gridcular_distance(m->coord, b->last_move.coord, b);
 436                 if (pc->ldist_min <= ldist && ldist <= pc->ldist_max) {
 437                         f->id = FEAT_LDIST;
 438                         f->payload = ldist;
 439                         (f++, p->n++);
 440                 }
 441         }
 442
 443         if (PS_ANY(LLDIST) && pc->ldist_max > 0 && !is_pass(b->last_move2.coord)) {
 444                 int lldist = coord_gridcular_distance(m->coord, b->last_move2.coord, b);
 445                 if (pc->ldist_min <= lldist && lldist <= pc->ldist_max) {
 446                         f->id = FEAT_LLDIST;
 447                         f->payload = lldist;
 448                         (f++, p->n++);
 449                 }
 450         }
 451
 452         if (PS_ANY(SPATIAL) && pc->spat_max > 0 && pc->spat_dict) {
 453                 f = pattern_match_spatial(pc, ps, p, f, b, m);
 454         }
 455
 456         if (PS_ANY(PATTERN3) && !is_pass(m->coord)) {
 457 #ifdef BOARD_PAT3
 458                 int pat = b->pat3[m->coord];
 459 #else
 460                 int pat = pattern3_hash(b, m->coord);
 461 #endif
 462                 if (m->color == S_WHITE) {
 463                         /* We work with the pattern3s as black-to-play. */
 464                         pat = pattern3_reverse(pat);
 465                 }
 466                 f->id = FEAT_PATTERN3;
 467                 f->payload = pat;
 468                 (f++, p->n++);
 469         }
 470
 471         /* FEAT_MCOWNER: TODO */
 472         assert(!pc->mcsims);
 473 }
 474
 475 char *
 476 pattern2str(char *str, struct pattern *p)
 477 {
 478         str = stpcpy(str, "(");
 479         for (int i = 0; i < p->n; i++) {
 480                 if (i > 0) str = stpcpy(str, " ");
 481                 str = feature2str(str, &p->f[i]);
 482         }
 483         str = stpcpy(str, ")");
 484         return str;
 485 }
 486
 487
 488
 489 /*** Features gamma set */
 490
 491 static void
 492 features_gamma_load(struct features_gamma *fg, const char *filename)
 493 {
 494         FILE *f = fopen(filename, "r");
 495         if (!f) return;
 496         char buf[256];
 497         while (fgets(buf, 256, f)) {
 498                 char *bufp = buf;
 499                 struct feature f;
 500                 bufp = str2feature(bufp, &f);
 501                 while (isspace(*bufp)) bufp++;
 502                 float gamma = strtof(bufp, &bufp);
 503                 /* Record feature's gamma. */
 504                 feature_gamma(fg, &f, &gamma);
 505                 /* In case of 3x3 patterns, record gamma also
 506                  * for all rotations and transpositions. */
 507                 if (f.id == FEAT_PATTERN3) {
 508                         int transp[8];
 509                         pattern3_transpose(f.payload, &transp);
 510                         for (int i = 1; i < 8; i++) {
 511                                 f.payload = transp[i];
 512                                 feature_gamma(fg, &f, &gamma);
 513                         }
 514                         f.payload = transp[0];
 515                 }
 516         }
 517         fclose(f);
 518 }
 519
 520 const char *features_gamma_filename = "patterns.gamma";
 521
 522 struct features_gamma *
 523 features_gamma_init(struct pattern_config *pc, const char *file)
 524 {
 525         struct features_gamma *fg = calloc(1, sizeof(*fg));
 526         fg->pc = pc;
 527         for (int i = 0; i < FEAT_MAX; i++) {
 528                 int n = feature_payloads(pc, i);
 529                 fg->gamma[i] = malloc(n * sizeof(float));
 530                 for (int j = 0; j < n; j++) {
 531                         fg->gamma[i][j] = 1.0f;
 532                 }
 533         }
 534         features_gamma_load(fg, file ? file : features_gamma_filename);
 535         return fg;
 536 }
 537
 538 void
 539 features_gamma_done(struct features_gamma *fg)
 540 {
 541         for (int i = 0; i < FEAT_MAX; i++)
 542                 free(fg->gamma[i]);
 543         free(fg);
 544 }