add legal actions

ChessBot-Dataset.py

@@ -9,6 +9,7 @@ from datasets import (
     Features,
     Value,
     Array2D,
+    Sequence,
 )
 import chess
 from adversarial_gym.chess_env import ChessEnv
@@ -26,6 +27,7 @@ class ChessPGNDataset(GeneratorBasedBuilder):
                 "state":       Array2D((8,8), dtype="int8"),
                 "action":      Value("int16"),
                 "best_action": Value("int16"),  # -1 if not available
+                "legal_actions": Sequence(Value("int16")),
                 "result":      Value("float32"),
             })
         )
@@ -106,10 +108,12 @@ class ChessPGNDataset(GeneratorBasedBuilder):
                             state  = ChessEnv.get_piece_configuration(board)
                             state  = state if board.turn else -state
                             action = ChessEnv.move_to_action(move)
+                            legal = [int(ChessEnv.move_to_action(m)) for m in board.legal_moves]
                             yield uid, {
                                 "state":       state.astype("int8"),
                                 "action":      int(action),
                                 "best_action": int(best_action),
+                                "legal_actions": legal,
                                 "result":      float(result),
                             }
                             uid += 1