def logarithmic_utility(self,
quantities_by_good_pbk: GoodHoldings) -> float:
"""
Compute agent's utility given her utility function params and a good bundle.
:param quantities_by_good_pbk: the good holdings (dictionary) with the identifier (key) and quantity (value) for each good
:return: utility value
"""
result = logarithmic_utility(self.utility_params_by_good_pbk,
quantities_by_good_pbk,
self._quantity_shift)
return result
def logarithmic_utility(self, quantities_by_good_id: GoodHoldings) -> float:
"""
Compute agent's utility given her utility function params and a good bundle.
:param quantities_by_good_id: the good holdings (dictionary) with the identifier (key) and quantity (value) for each good
:return: utility value
"""
enforce(self.is_initialized, "Preferences params not set!")
result = logarithmic_utility(
self.utility_params_by_good_id, quantities_by_good_id, self._quantity_shift
)
return result
def test_logarithmic_utility():
"""Test logarithmic utlity."""
assert (logarithmic_utility(
utility_params_by_good_id={
"good_1": 0.2,
"good_2": 0.8
},
quantities_by_good_id={
"good_1": 2,
"good_2": 1
},
) > 0), "Utility should be positive."
def get_score(self) -> float:
"""
Compute the score of the current state.
The score is computed as the sum of all the utilities for the good holdings
with positive quantity plus the money left.
:return: the score.
"""
goods_score = logarithmic_utility(self.utility_params_by_good_id,
self.quantities_by_good_id)
money_score = linear_utility(self.exchange_params_by_currency_id,
self.amount_by_currency_id)
score = goods_score + money_score
return score
