OpenSpiel state methods: string_to_action

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1. string_to_action(player: int, action_str: str)

2. string_to_action(action_str: str)

Converts a string representation of an action back to its integer action ID. This reverses the mapping done by action_to_string(). The parameterless version uses the current player.

Note: the default implementation loops over all legal actions and compares strings, so it can be slow for games with large action spaces.

Examples:

import pyspiel

game = pyspiel.load_game("tic_tac_toe")
state = game.new_initial_state()

action_str = state.action_to_string(0, 4)
print(action_str)                            # Output: x(1,1)

action_id = state.string_to_action(0, action_str)
print(action_id)                             # Output: 4

# Parameterless version uses current player
action_id = state.string_to_action(action_str)
print(action_id)                             # Output: 4