OpenSpiel game methods: make_observer

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1. make_observer(iig_obs_type: IIGObservationType, params: dict)
2. make_observer(params: dict)

Creates an Observer object for obtaining observations of the game state. The observer produces observation tensors and strings according to the requested observation type. If iig_obs_type is omitted, the default observation type is used.

The IIGObservationType controls what information is included in the observation: public information, private information, and whether perfect recall is used. See observer.h for details.

Returns None if the requested observation type is not supported by the game.

Examples:

import pyspiel

game = pyspiel.load_game("leduc_poker")
observer = game.make_observer(
    pyspiel.IIGObservationType(
        public_info=True,
        perfect_recall=False,
        private_info=pyspiel.PrivateInfoType.SINGLE_PLAYER),
    {})
state = game.new_initial_state()
state.apply_action(0)  # Deal first card
state.apply_action(1)  # Deal second card
print(observer.string_from(state, player=0))

# Using default observation type
observer2 = game.make_observer({})