game_num_distinct_actions.md

OpenSpiel game methods: num_distinct_actions

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num_distinct_actions()

Returns the number of state-independent actions in the game. Valid actions in a game will always be between 0 and num_distinct_actions() - 1. This number can be thought of as the fixed width of a policy head or Q-network. Legal actions are always a subset of { 0, 1, ... , num_distinct_actions() - 1 }.

Examples:

import pyspiel

game = pyspiel.load_game("tic_tac_toe")
print(game.num_distinct_actions())    # Output: 9

game = pyspiel.load_game("go")
print (game.num_distinct_actions())   # Output: 362

game = pyspiel.load_game("chess")
print (game.num_distinct_actions())   # Output: 4672

game = pyspiel.load_game("leduc_poker")
print (game.num_distinct_actions())   # Output: 3