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tune8dbs.c
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tune8dbs.c
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/*
File: tune8dbs.c
Created: July 25, 1998
Modified: December 20, 2001
Author: Gunnar Andersson (gunnar@radagast.se)
Contents: The database is analyzed with statistical methods;
feature values are determined using a damped variant
of Fletcher-Reeves' method on the sum of the squared
errors.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/* Define the inline directive when available */
#ifdef __GNUC__
#define INLINE __inline__
#else
#define INLINE
#endif
/* Common constants */
#define TRUE 1
#define FALSE 0
/* These values are only used in the initialization phase */
#define UPDATE_BOUND 0.50
/* What to use and what not to use */
#define USE_PARITY 1
#define USE_A_FILE 0
#define USE_A_FILE2X 1
#define USE_B_FILE 1
#define USE_C_FILE 1
#define USE_D_FILE 1
#define USE_DIAG8 1
#define USE_DIAG7 1
#define USE_DIAG6 1
#define USE_DIAG5 1
#define USE_DIAG4 1
#define USE_CORNER52 1
#define USE_CORNER33 1
/* Miscellaneous parameters */
#define NULL_MOVE 0
#define DEFAULT_MAX_POSITIONS 10000
#define DEFAULT_BUFFER_SIZE 1000
/* Side-to-move values (from constant.h) */
#define BLACKSQ 0
#define EMPTY 1
#define WHITESQ 2
/* Macros */
#define MIN(a,b) ((a < b) ? a : b)
#define SQR(a) ((a) * (a))
/* All info needed for each pattern during the optimization process */
typedef struct {
double solution;
double gradient, direction;
int pattern;
int frequency;
int most_common;
} InfoItem;
/* A compact 128-bit position representation + flags used
in the parameter tuning. */
typedef struct {
short row_bit_vec[8];
short side_to_move;
short score;
short stage;
} CompactPosition;
double objective;
double abs_error_sum;
double max_delta, average_delta;
double delta_sum;
double quad_coeff, lin_coeff, const_coeff;
double total_weight;
double weight[61];
int stage_count;
int analysis_stage;
int update_count;
int last_active;
int max_positions, position_count;
int max_diff;
int relevant_count, node_count, interval;
int buffer_size, node_buffer_pos, short_buffer_pos;
int node_allocations, short_allocations;
int stage[64];
int active[61];
int compact[1048576];
int mirror[6561];
int flip52[59049];
int mirror7[2187];
int mirror6[729];
int mirror5[243];
int mirror4[81];
int mirror3[27];
int mirror82x[59049];
int identity10[59049];
int flip33[19683];
int mirror33[19683];
int board[100];
int row_pattern[8];
int col_pattern[8];
int diag1_pattern[15];
int diag2_pattern[15];
int row_no[100];
int row_index[100];
int col_no[100];
int col_index[100];
int diag1_no[100];
int diag1_index[100];
int diag2_no[100];
int diag2_index[100];
short *short_buffer;
CompactPosition *position_list;
InfoItem constant;
InfoItem parity;
InfoItem afile[6561], bfile[6561], cfile[6561], dfile[6561];
InfoItem corner52[59049];
InfoItem diag8[6561], diag7[2187], diag6[729], diag5[243], diag4[81];
InfoItem corner33[19683];
InfoItem afile2x[59049];
int inverse4[81];
int inverse5[243];
int inverse6[729];
int inverse7[2187];
int inverse8[6561];
int inverse9[19683];
int inverse10[59049];
/*
PACK_POSITION
Pack the information from the line BUFFER into node #INDEX
in POSITION_LIST. Returns 1 if the position was incorporated,
otherwise 0.
*/
int pack_position( char *buffer, int index ) {
int black_mask, white_mask;
int i, j;
int mask;
int stage, score;
unsigned char hi_mask, lo_mask;
sscanf( buffer + 34, "%d %d", &stage, &score );
if ( abs( score ) > max_diff )
return 0;
for ( i = 0; i < 8; i++ ) {
sscanf( buffer + 4 * i, "%c%c", &hi_mask, &lo_mask );
hi_mask -= ' ';
lo_mask -= ' ';
black_mask = (hi_mask << 4) + lo_mask;
sscanf( buffer + 4 * i + 2, "%c%c", &hi_mask, &lo_mask );
hi_mask -= ' ';
lo_mask -= ' ';
white_mask = (hi_mask << 4) + lo_mask;
mask = 0;
for ( j = 0; j < 8; j++ ) {
mask *= 4;
if ( black_mask & (1 << j) )
mask += BLACKSQ;
else if ( white_mask & (1 << j) )
mask += WHITESQ;
else
mask += EMPTY;
}
position_list[index].row_bit_vec[i] = mask;
}
switch ( buffer[33] ) {
case '*':
position_list[index].side_to_move = BLACKSQ;
position_list[index].score = score;
break;
case 'O':
position_list[index].side_to_move = WHITESQ;
position_list[index].score = -score;
break;
default:
printf( "Invalid side to move indicator on line %d in input file\n",
index );
break;
}
position_list[index].stage = stage;
return 1;
}
/*
UNPACK_POSITION
Expand the 128-bit compressed position into a full board.
*/
void unpack_position( int index ) {
int i, j, pos;
int mask;
/* Nota bene: Some care has to be taken not to mirror-reflect
each row - the MSDB is the leftmost position on each row. */
for ( i = 0; i < 8; i++ ) {
mask = position_list[index].row_bit_vec[i];
for ( j = 0, pos = 10 * (i + 1) + 8; j < 8; j++, pos-- ) {
board[pos] = mask & 3;
mask >>= 2;
}
}
}
/*
DISPLAY_BOARD
Provides a crude position dump.
*/
void display_board( int index ) {
int i, j;
puts("");
for (i = 1; i <= 8; i++) {
printf(" ");
for (j = 1; j <= 8; j++)
switch (board[10 * i + j]) {
case EMPTY:
printf(" ");
break;
case BLACKSQ:
printf("*");
break;
case WHITESQ:
printf("O");
break;
default:
printf("?");
break;
}
puts("");
}
puts("");
printf("side_to_move=%d\n", position_list[index].side_to_move);
printf("stage=%d\n", position_list[index].stage);
printf("score=%d\n", position_list[index].score);
}
/*
READ_POSITION_FILE
Reads a game database and creates a game tree containing its games.
*/
void read_position_file(char *file_name) {
FILE *stream;
char buffer[100];
position_list = malloc( max_positions * sizeof( CompactPosition ) );
if ( position_list == NULL ) {
printf( "Couldn't allocate space for %d positions\n", max_positions );
exit( EXIT_FAILURE );
}
stream = fopen( file_name, "r" );
if ( stream == NULL ) {
printf( "Could not open game file '%s'\n", file_name );
exit( EXIT_FAILURE );
}
position_count = 0;
do {
fgets( buffer, 100, stream );
if ( !feof( stream ) )
if ( pack_position( buffer, position_count ) )
position_count++;
} while ( !feof( stream ) && (position_count < max_positions) );
fclose( stream );
printf( "%d positions loaded\n", position_count );
/*
for ( int i = 0; i < position_count; i++ ) {
unpack_position( i );
display_board( i );
}
*/
}
/*
COMPUTE_PATTERNS
Computes the board patterns corresponding to rows, columns
and diagonals.
*/
void compute_patterns( void ) {
int i, j, pos;
for ( i = 0; i < 8; i++ ) {
row_pattern[i] = 0;
col_pattern[i] = 0;
}
for ( i = 0; i < 15; i++ ) {
diag1_pattern[i] = 0;
diag2_pattern[i] = 0;
}
for ( i = 1; i <= 8; i++ )
for ( j = 1; j <= 8; j++ ) {
pos = 10 * i + j;
row_pattern[row_no[pos]] += board[pos] << (row_index[pos] << 1);
col_pattern[col_no[pos]] += board[pos] << (col_index[pos] << 1);
diag1_pattern[diag1_no[pos]] += board[pos] << (diag1_index[pos] << 1);
diag2_pattern[diag2_no[pos]] += board[pos] << (diag2_index[pos] << 1);
}
}
/*
SORT
Sorts an integer vector using bubble-sort.
*/
INLINE
void sort( int *vec, int count ) {
int i;
int temp;
int changed;
do {
changed = 0;
for ( i = 0; i < count - 1; i++ )
if ( vec[i] > vec[i + 1] ) {
changed = 1;
temp = vec[i];
vec[i] = vec[i + 1];
vec[i + 1] = temp;
}
} while ( changed );
}
/*
DETERMINE_FEATURES
Takes a position and determines the values of all
active features
*/
void determine_features( int side_to_move, int stage, int *global_parity,
int *buffer_a, int *buffer_b,
int *buffer_c, int *buffer_d,
int *buffer_52, int *buffer_33,
int *buffer_8, int *buffer_7, int *buffer_6,
int *buffer_5, int *buffer_4 ) {
int config52, config33;
compute_patterns();
/* Non-pattern measures */
if ( USE_PARITY ) {
if (stage % 2 == 1)
*global_parity = 1;
else
*global_parity = 0;
}
/* The A file (with or without adjacent X-squares) */
if ( USE_A_FILE ) {
if ( side_to_move == BLACKSQ ) {
buffer_a[0] = mirror[compact[row_pattern[0]]];
buffer_a[1] = mirror[compact[row_pattern[7]]];
buffer_a[2] = mirror[compact[col_pattern[0]]];
buffer_a[3] = mirror[compact[col_pattern[7]]];
}
else {
buffer_a[0] = mirror[inverse8[compact[row_pattern[0]]]];
buffer_a[1] = mirror[inverse8[compact[row_pattern[7]]]];
buffer_a[2] = mirror[inverse8[compact[col_pattern[0]]]];
buffer_a[3] = mirror[inverse8[compact[col_pattern[7]]]];
}
}
else if ( USE_A_FILE2X ) {
if ( side_to_move == BLACKSQ ) {
buffer_a[0] = mirror82x[compact[row_pattern[0]] + 6561 * board[22] + 19683 * board[27]];
buffer_a[1] = mirror82x[compact[row_pattern[7]] + 6561 * board[72] + 19683 * board[77]];
buffer_a[2] = mirror82x[compact[col_pattern[0]] + 6561 * board[22] + 19683 * board[72]];
buffer_a[3] = mirror82x[compact[col_pattern[7]] + 6561 * board[27] + 19683 * board[77]];
}
else {
buffer_a[0] = mirror82x[inverse10[compact[row_pattern[0]] + 6561 * board[22] + 19683 * board[27]]];
buffer_a[1] = mirror82x[inverse10[compact[row_pattern[7]] + 6561 * board[72] + 19683 * board[77]]];
buffer_a[2] = mirror82x[inverse10[compact[col_pattern[0]] + 6561 * board[22] + 19683 * board[72]]];
buffer_a[3] = mirror82x[inverse10[compact[col_pattern[7]] + 6561 * board[27] + 19683 * board[77]]];
}
}
/* The B file */
if ( USE_B_FILE ) {
if ( side_to_move == BLACKSQ ) {
buffer_b[0] = mirror[compact[row_pattern[1]]];
buffer_b[1] = mirror[compact[row_pattern[6]]];
buffer_b[2] = mirror[compact[col_pattern[1]]];
buffer_b[3] = mirror[compact[col_pattern[6]]];
}
else {
buffer_b[0] = mirror[inverse8[compact[row_pattern[1]]]];
buffer_b[1] = mirror[inverse8[compact[row_pattern[6]]]];
buffer_b[2] = mirror[inverse8[compact[col_pattern[1]]]];
buffer_b[3] = mirror[inverse8[compact[col_pattern[6]]]];
}
}
/* The C file */
if ( USE_C_FILE ) {
if ( side_to_move == BLACKSQ ) {
buffer_c[0] = mirror[compact[row_pattern[2]]];
buffer_c[1] = mirror[compact[row_pattern[5]]];
buffer_c[2] = mirror[compact[col_pattern[2]]];
buffer_c[3] = mirror[compact[col_pattern[5]]];
}
else {
buffer_c[0] = mirror[inverse8[compact[row_pattern[2]]]];
buffer_c[1] = mirror[inverse8[compact[row_pattern[5]]]];
buffer_c[2] = mirror[inverse8[compact[col_pattern[2]]]];
buffer_c[3] = mirror[inverse8[compact[col_pattern[5]]]];
}
}
/* The D file */
if ( USE_D_FILE ) {
if ( side_to_move == BLACKSQ ) {
buffer_d[0] = mirror[compact[row_pattern[3]]];
buffer_d[1] = mirror[compact[row_pattern[4]]];
buffer_d[2] = mirror[compact[col_pattern[3]]];
buffer_d[3] = mirror[compact[col_pattern[4]]];
}
else {
buffer_d[0] = mirror[inverse8[compact[row_pattern[3]]]];
buffer_d[1] = mirror[inverse8[compact[row_pattern[4]]]];
buffer_d[2] = mirror[inverse8[compact[col_pattern[3]]]];
buffer_d[3] = mirror[inverse8[compact[col_pattern[4]]]];
}
}
/* The 5*2 corner pattern */
if ( USE_CORNER52 ) {
if ( side_to_move == BLACKSQ ) {
/* a1-e1 + a2-e2 */
config52 = (row_pattern[0] & 1023) + ((row_pattern[1] & 1023) << 10);
buffer_52[0] = compact[config52];
/* a1-a5 + b1-b5 */
config52 = (col_pattern[0] & 1023) + ((col_pattern[1] & 1023) << 10);
buffer_52[1] = compact[config52];
/* h1-d1 + h2-d2 */
config52 = (row_pattern[0] >> 6) + ((row_pattern[1] >> 6) << 10);
buffer_52[2] = flip52[compact[config52]];
/* h1-h5 + g1-g5 */
config52 = (col_pattern[7] & 1023) + ((col_pattern[6] & 1023) << 10);
buffer_52[3] = compact[config52];
/* a8-e8 + a7-e7 */
config52 = (row_pattern[7] & 1023) + ((row_pattern[6] & 1023) << 10);
buffer_52[4] = compact[config52];
/* a8-a4 + b8-b4 */
config52 = (col_pattern[0] >> 6) + ((col_pattern[1] >> 6) << 10);
buffer_52[5] = flip52[compact[config52]];
/* h8-d8 + h7-d7 */
config52 = (row_pattern[7] >> 6) + ((row_pattern[6] >> 6) << 10);
buffer_52[6] = flip52[compact[config52]];
/* h8-h4 + g8-g4 */
config52 = (col_pattern[7] >> 6) + ((col_pattern[6] >> 6) << 10);
buffer_52[7] = flip52[compact[config52]];
}
else {
/* a1-e1 + a2-e2 */
config52 = (row_pattern[0] & 1023) + ((row_pattern[1] & 1023) << 10);
buffer_52[0] = inverse10[compact[config52]];
/* a1-a5 + b1-b5 */
config52 = (col_pattern[0] & 1023) + ((col_pattern[1] & 1023) << 10);
buffer_52[1] = inverse10[compact[config52]];
/* h1-d1 + h2-d2 */
config52 = (row_pattern[0] >> 6) + ((row_pattern[1] >> 6) << 10);
buffer_52[2] = inverse10[flip52[compact[config52]]];
/* h1-h5 + g1-g5 */
config52 = (col_pattern[7] & 1023) + ((col_pattern[6] & 1023) << 10);
buffer_52[3] = inverse10[compact[config52]];
/* a8-e8 + a7-e7 */
config52 = (row_pattern[7] & 1023) + ((row_pattern[6] & 1023) << 10);
buffer_52[4] = inverse10[compact[config52]];
/* a8-a4 + b8-b4 */
config52 = (col_pattern[0] >> 6) + ((col_pattern[1] >> 6) << 10);
buffer_52[5] = inverse10[flip52[compact[config52]]];
/* h8-e8 + h7-e7 */
config52 = (row_pattern[7] >> 6) + ((row_pattern[6] >> 6) << 10);
buffer_52[6] = inverse10[flip52[compact[config52]]];
/* h8-h4 + g8-g4 */
config52 = (col_pattern[7] >> 6) + ((col_pattern[6] >> 6) << 10);
buffer_52[7] = inverse10[flip52[compact[config52]]];
}
}
/* The 3*3 corner pattern */
if ( USE_CORNER33 ) {
if ( side_to_move == BLACKSQ ) {
/* a1-c1 + a2-c2 + a3-c3 */
config33 = (row_pattern[0] & 63) +
((row_pattern[1] & 63) << 6) +
((row_pattern[2] & 63) << 12);
buffer_33[0] = mirror33[compact[config33]];
/* h1-f1 + h2-f2 + h3-f3 */
config33 = (row_pattern[0] >> 10) +
((row_pattern[1] >> 10) << 6) +
((row_pattern[2] >> 10) << 12);
buffer_33[1] = mirror33[flip33[compact[config33]]];
/* a8-c8 + a7-c7 + a6-c6 */
config33 = (row_pattern[7] & 63) +
((row_pattern[6] & 63) << 6) +
((row_pattern[5] & 63) << 12);
buffer_33[2] = mirror33[compact[config33]];
/* h8-f8 + h7-f7 + h6-f6 */
config33 = (row_pattern[7] >> 10) +
((row_pattern[6] >> 10) << 6) +
((row_pattern[5] >> 10) << 12);
buffer_33[3] = mirror33[flip33[compact[config33]]];
}
else {
/* a1-c1 + a2-c2 + a3-c3 */
config33 = (row_pattern[0] & 63) +
((row_pattern[1] & 63) << 6) +
((row_pattern[2] & 63) << 12);
buffer_33[0] = mirror33[inverse9[compact[config33]]];
/* h1-f1 + h2-f2 + h3-f3 */
config33 = (row_pattern[0] >> 10) +
((row_pattern[1] >> 10) << 6) +
((row_pattern[2] >> 10) << 12);
buffer_33[1] = mirror33[inverse9[flip33[compact[config33]]]];
/* a8-c8 + a7-c7 + a6-c6 */
config33 = (row_pattern[7] & 63) +
((row_pattern[6] & 63) << 6) +
((row_pattern[5] & 63) << 12);
buffer_33[2] = mirror33[inverse9[compact[config33]]];
/* h8-f8 + h7-f7 + h6-f6 */
config33 = (row_pattern[7] >> 10) +
((row_pattern[6] >> 10) << 6) +
((row_pattern[5] >> 10) << 12);
buffer_33[3] = mirror33[inverse9[flip33[compact[config33]]]];
}
}
/* The diagonals of length 8 */
if ( USE_DIAG8 ) {
if ( side_to_move == BLACKSQ ) {
buffer_8[0] = mirror[compact[diag1_pattern[7]]];
buffer_8[1] = mirror[compact[diag2_pattern[7]]];
}
else {
buffer_8[0] = mirror[inverse8[compact[diag1_pattern[7]]]];
buffer_8[1] = mirror[inverse8[compact[diag2_pattern[7]]]];
}
}
/* The diagonals of length 7 */
if ( USE_DIAG7 ) {
if ( side_to_move == BLACKSQ ) {
buffer_7[0] = mirror7[compact[diag1_pattern[6]]];
buffer_7[1] = mirror7[compact[diag1_pattern[8]]];
buffer_7[2] = mirror7[compact[diag2_pattern[6]]];
buffer_7[3] = mirror7[compact[diag2_pattern[8]]];
}
else {
buffer_7[0] = mirror7[inverse7[compact[diag1_pattern[6]]]];
buffer_7[1] = mirror7[inverse7[compact[diag1_pattern[8]]]];
buffer_7[2] = mirror7[inverse7[compact[diag2_pattern[6]]]];
buffer_7[3] = mirror7[inverse7[compact[diag2_pattern[8]]]];
}
}
/* The diagonals of length 6 */
if ( USE_DIAG6 ) {
if ( side_to_move == BLACKSQ ) {
buffer_6[0] = mirror6[compact[diag1_pattern[5]]];
buffer_6[1] = mirror6[compact[diag1_pattern[9]]];
buffer_6[2] = mirror6[compact[diag2_pattern[5]]];
buffer_6[3] = mirror6[compact[diag2_pattern[9]]];
}
else {
buffer_6[0] = mirror6[inverse6[compact[diag1_pattern[5]]]];
buffer_6[1] = mirror6[inverse6[compact[diag1_pattern[9]]]];
buffer_6[2] = mirror6[inverse6[compact[diag2_pattern[5]]]];
buffer_6[3] = mirror6[inverse6[compact[diag2_pattern[9]]]];
}
}
/* The diagonals of length 5 */
if ( USE_DIAG5 ) {
if ( side_to_move == BLACKSQ ) {
buffer_5[0] = mirror5[compact[diag1_pattern[4]]];
buffer_5[1] = mirror5[compact[diag1_pattern[10]]];
buffer_5[2] = mirror5[compact[diag2_pattern[4]]];
buffer_5[3] = mirror5[compact[diag2_pattern[10]]];
}
else {
buffer_5[0] = mirror5[inverse5[compact[diag1_pattern[4]]]];
buffer_5[1] = mirror5[inverse5[compact[diag1_pattern[10]]]];
buffer_5[2] = mirror5[inverse5[compact[diag2_pattern[4]]]];
buffer_5[3] = mirror5[inverse5[compact[diag2_pattern[10]]]];
}
}
/* The diagonals of length 4 */
if ( USE_DIAG4 ) {
if (side_to_move == BLACKSQ) {
buffer_4[0] = mirror4[compact[diag1_pattern[3]]];
buffer_4[1] = mirror4[compact[diag1_pattern[11]]];
buffer_4[2] = mirror4[compact[diag2_pattern[3]]];
buffer_4[3] = mirror4[compact[diag2_pattern[11]]];
}
else {
buffer_4[0] = mirror4[inverse4[compact[diag1_pattern[3]]]];
buffer_4[1] = mirror4[inverse4[compact[diag1_pattern[11]]]];
buffer_4[2] = mirror4[inverse4[compact[diag2_pattern[3]]]];
buffer_4[3] = mirror4[inverse4[compact[diag2_pattern[11]]]];
}
}
}
/*
PERFORM_ANALYSIS
Updates frequency counts.
*/
void perform_analysis( int index ) {
int coeff, start, stop;
int global_parity;
int side_to_move, stage;
int buffer_a[4], buffer_b[4], buffer_c[4], buffer_d[4];
int buffer_52[8], buffer_33[4];
int buffer_8[4], buffer_7[4], buffer_6[4], buffer_5[4], buffer_4[4];
side_to_move = position_list[index].side_to_move;
stage = position_list[index].stage;
determine_features( side_to_move, stage,
&global_parity, buffer_a, buffer_b,
buffer_c, buffer_d, buffer_52,
buffer_33, buffer_8, buffer_7, buffer_6,
buffer_5, buffer_4 );
/* The D file */
sort( buffer_d, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_d[stop] == buffer_d[start]) )
stop++;
coeff = stop - start;
dfile[buffer_d[start]].frequency++;
start = stop;
} while (start < 4);
/* The C file */
sort(buffer_c, 4);
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_c[stop] == buffer_c[start]) )
stop++;
coeff = stop - start;
cfile[buffer_c[start]].frequency++;
start = stop;
} while ( start < 4 );
/* The B file */
sort( buffer_b, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_b[stop] == buffer_b[start]) )
stop++;
coeff = stop - start;
bfile[buffer_b[start]].frequency++;
start = stop;
} while ( start < 4 );
/* The A file */
sort( buffer_a, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_a[stop] == buffer_a[start]) )
stop++;
coeff = stop - start;
if ( USE_A_FILE )
afile[buffer_a[start]].frequency++;
else if ( USE_A_FILE2X )
afile2x[buffer_a[start]].frequency++;
start = stop;
} while ( start < 4 );
/* The diagonals of length 8 */
sort( buffer_8, 2 );
start = 0;
do {
stop = start + 1;
while ( (stop < 2) && (buffer_8[stop] == buffer_8[start]) )
stop++;
coeff = stop - start;
diag8[buffer_8[start]].frequency++;
start = stop;
} while ( start < 2 );
/* The diagonals of length 7 */
sort( buffer_7, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_7[stop] == buffer_7[start]) )
stop++;
coeff = stop - start;
diag7[buffer_7[start]].frequency++;
start = stop;
} while ( start < 4 );
/* The diagonals of length 6 */
sort( buffer_6, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_6[stop] == buffer_6[start]) )
stop++;
coeff = stop - start;
diag6[buffer_6[start]].frequency++;
start = stop;
} while (start < 4 );
/* The diagonals of length 5 */
sort( buffer_5, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_5[stop] == buffer_5[start]) )
stop++;
coeff = stop - start;
diag5[buffer_5[start]].frequency++;
start = stop;
} while ( start < 4 );
/* The diagonals of length 4 */
sort( buffer_4, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_4[stop] == buffer_4[start]) )
stop++;
coeff = stop - start;
diag4[buffer_4[start]].frequency++;
start = stop;
} while ( start < 4 );
/* The 5*2 corner pattern */
sort( buffer_52, 8 );
start = 0;
do {
stop = start + 1;
while ( (stop < 8) && (buffer_52[stop] == buffer_52[start]) )
stop++;
coeff = stop - start;
corner52[buffer_52[start]].frequency++;
start = stop;
} while ( start < 8 );
/* The 3*3 corner pattern */
sort( buffer_33, 4 );
start = 0;
do {
stop = start + 1;
while ( (stop < 4) && (buffer_33[stop] == buffer_33[start]) )
stop++;
coeff = stop - start;
corner33[buffer_33[start]].frequency++;
start = stop;
} while ( start < 4 );
}
/*
PERFORM_EVALUATION
Updates the gradient based on the position BRANCH.
*/
void perform_evaluation( int index ) {
double error;
double grad_contrib;
double curr_weight;
int i;
int global_parity;
int side_to_move, stage;
int buffer_a[4], buffer_b[4], buffer_c[4], buffer_d[4];
int buffer_52[8], buffer_33[4];
int buffer_8[4], buffer_7[4], buffer_6[4], buffer_5[4], buffer_4[4];
/* Get the pattern values */
side_to_move = position_list[index].side_to_move;
stage = position_list[index].stage;
determine_features( side_to_move, stage,
&global_parity, buffer_a, buffer_b,
buffer_c, buffer_d, buffer_52,
buffer_33, buffer_8, buffer_7, buffer_6,
buffer_5, buffer_4 );
/* Calculate the contribution to the gradient and the objective */
error = -position_list[index].score;
curr_weight = weight[stage];
total_weight += curr_weight;
error += constant.solution;
if ( USE_PARITY )
error += parity.solution * global_parity;
if ( USE_A_FILE )
for ( i = 0; i < 4; i++ )
error += afile[buffer_a[i]].solution;
else if ( USE_A_FILE2X )
for ( i = 0; i < 4; i++ )
error += afile2x[buffer_a[i]].solution;
if ( USE_B_FILE )
for ( i = 0; i < 4; i++ )
error += bfile[buffer_b[i]].solution;
if ( USE_C_FILE )
for ( i = 0; i < 4; i++ )
error += cfile[buffer_c[i]].solution;
if ( USE_D_FILE )
for ( i = 0; i < 4; i++ )
error += dfile[buffer_d[i]].solution;
if ( USE_CORNER52 )
for ( i = 0; i < 8; i++ )
error += corner52[buffer_52[i]].solution;
if ( USE_CORNER33 )
for ( i = 0; i < 4; i++ )
error += corner33[buffer_33[i]].solution;
if ( USE_DIAG8 )
for ( i = 0; i < 2; i++ )
error += diag8[buffer_8[i]].solution;
if ( USE_DIAG7 )
for ( i = 0; i < 4; i++ )
error += diag7[buffer_7[i]].solution;
if ( USE_DIAG6 )
for (i = 0; i < 4; i++)
error += diag6[buffer_6[i]].solution;
if ( USE_DIAG5 )
for ( i = 0; i < 4; i++ )
error += diag5[buffer_5[i]].solution;
if ( USE_DIAG4 )
for ( i = 0; i < 4; i++ )
error += diag4[buffer_4[i]].solution;
error *= curr_weight;
objective += error * error;
abs_error_sum += fabs(error);
grad_contrib = 2.0 * curr_weight * error;
constant.gradient += grad_contrib;
if ( USE_PARITY )
parity.gradient += grad_contrib * global_parity;
if ( USE_A_FILE )
for ( i = 0; i < 4; i++ )
afile[buffer_a[i]].gradient += grad_contrib;
else if ( USE_A_FILE2X )
for ( i = 0; i < 4; i++ )
afile2x[buffer_a[i]].gradient += grad_contrib;
if ( USE_B_FILE )
for ( i = 0; i < 4; i++ )
bfile[buffer_b[i]].gradient += grad_contrib;
if ( USE_C_FILE )
for ( i = 0; i < 4; i++ )
cfile[buffer_c[i]].gradient += grad_contrib;
if ( USE_D_FILE )
for ( i = 0; i < 4; i++ )
dfile[buffer_d[i]].gradient += grad_contrib;
if ( USE_CORNER52 )
for (i = 0; i < 8; i++)
corner52[buffer_52[i]].gradient += grad_contrib;
if ( USE_CORNER33 )
for ( i = 0; i < 4; i++ )
corner33[buffer_33[i]].gradient += grad_contrib;
if ( USE_DIAG8 )
for ( i = 0; i < 2; i++ )
diag8[buffer_8[i]].gradient += grad_contrib;
if ( USE_DIAG7 )
for ( i = 0; i < 4; i++ )
diag7[buffer_7[i]].gradient += grad_contrib;
if ( USE_DIAG6 )
for ( i = 0; i < 4; i++ )
diag6[buffer_6[i]].gradient += grad_contrib;
if ( USE_DIAG5 )
for ( i = 0; i < 4; i++ )
diag5[buffer_5[i]].gradient += grad_contrib;
if ( USE_DIAG4 )
for ( i = 0; i < 4; i++ )
diag4[buffer_4[i]].gradient += grad_contrib;
}
/*
PERFORM_STEP_UPDATE
Updates the parameters used to determine the optimal step length
based on the position BRANCH.
*/
void perform_step_update( int index ) {
double error;
double grad_contrib;
double curr_weight;
int i;
int global_parity;
int side_to_move, stage;
int buffer_a[4], buffer_b[4], buffer_c[4], buffer_d[4];
int buffer_52[8], buffer_33[4];
int buffer_8[4], buffer_7[4], buffer_6[4], buffer_5[4], buffer_4[4];
/* Get the pattern values */
side_to_move = position_list[index].side_to_move;
stage = position_list[index].stage;
determine_features( side_to_move, stage,
&global_parity, buffer_a, buffer_b,
buffer_c, buffer_d, buffer_52,
buffer_33, buffer_8, buffer_7, buffer_6,
buffer_5, buffer_4 );
/* Calculate the contribution to the gradient and the objective */
error = -position_list[index].score;
grad_contrib = 0.0;
error += constant.solution;
grad_contrib += constant.direction;
if ( USE_PARITY ) {
error += parity.solution * global_parity;
grad_contrib += parity.direction * global_parity;
}
if ( USE_A_FILE )
for ( i = 0; i < 4; i++ ) {
error += afile[buffer_a[i]].solution;
grad_contrib += afile[buffer_a[i]].direction;