From c9823c76dd43aa40bef3f67fa0940a78cb40bf05 Mon Sep 17 00:00:00 2001
From: tslil clingman <tslil@posteo.de>
Date: Wed, 17 Mar 2021 23:10:53 -0400
Subject: Corrected generation of training data for 6s

---
 resources/extract.sh |  2 +-
 src/cnn_train.py     |  2 +-
 src/pptdb.c          | 16 ++++++++--------
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/resources/extract.sh b/resources/extract.sh
index 0d92ad4..2c4b153 100755
--- a/resources/extract.sh
+++ b/resources/extract.sh
@@ -61,7 +61,7 @@ fi
 
 make pptdb
 
-for size in 5; do
+for size in 6; do
 		echo
 		extract $size notation,result
 		process $size 1000000 training
diff --git a/src/cnn_train.py b/src/cnn_train.py
index 111aa76..4ba0a0b 100644
--- a/src/cnn_train.py
+++ b/src/cnn_train.py
@@ -1,4 +1,4 @@
-# train5.py, train a small CNN to recognise winning Tak positions
+# cnn_train.py, train a small CNN to recognise winning Tak positions
 #
 # Copyright (C) 2021, tslil clingman
 #
diff --git a/src/pptdb.c b/src/pptdb.c
index 8684c47..79f60c5 100644
--- a/src/pptdb.c
+++ b/src/pptdb.c
@@ -29,8 +29,6 @@ uint64_t heights[16];
 FILE *training_fh = NULL;
 float max_flats, outcome_black;
 
-const int max_depth = 6;
-
 static void
 write_input(const int dx, const int dy, const uint8_t swap) {
 	// Two numbers for flats remaining
@@ -41,7 +39,7 @@ write_input(const int dx, const int dy, const uint8_t swap) {
 	// Write the board layers
 	float val;
 	int col, row;
-	for (uint8_t depth = 0; depth < max_depth; depth++) {
+	for (uint8_t depth = 0; depth < board_size + 1; depth++) {
 		row = (dy>0)?-1:board_size;
 		for (int i = 0; i < board_size; i++) {
 			row += dy;
@@ -134,11 +132,13 @@ parse_line(const char *pt, const ssize_t read) {
 				}
 			}
 		}
-		// Generate training data, not too early in the game, all
-		// orientations
-		if (generate && ply + 3 >= total_plies) {
-#define RANDPM1 ((rand()&1)?-1:+1)
-			write_input(RANDPM1, RANDPM1, rand()&1);
+		// Generate training data, not too early in the game and not at
+		// the end, under all eight symmetries of the board
+		if (generate && ply < total_plies && ply + 2 >= total_plies) {
+			write_input(+1, +1, 1); write_input(+1, +1, 0);
+			write_input(+1, -1, 1); write_input(+1, -1, 0);
+			write_input(-1, +1, 1); write_input(-1, +1, 0);
+			write_input(-1, -1, 1); write_input(-1, -1, 0);
 		}
 		// Parse next action
 		while (idx<read && pt[idx++]!=',');
-- 
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