def setUp(self):
'''Setup a LogitDynamics instance'''
# symmetric 2x2 coordination game
payoff_matrix = [[4, 0],
[3, 2]]
beta = 4.0
g = NormalFormGame(payoff_matrix)
self.ld = LogitDynamics(g, beta=beta)
def test_set_choice_probs_with_asymmetric_payoff_matrix():
bimatrix = np.array([[(4, 4), (1, 1), (0, 3)],
[(3, 0), (1, 1), (2, 2)]])
beta = 1.0
g = NormalFormGame(bimatrix)
ld = LogitDynamics(g, beta=beta)
# (Normalized) CDFs of logit choice
cdfs = np.ones((bimatrix.shape[1], bimatrix.shape[0]))
cdfs[:, 0] = 1 / (1 + np.exp(beta*(bimatrix[1, :, 0]-bimatrix[0, :, 0])))
# self.ld.players[0].logit_choice_cdfs: unnormalized
cdfs_computed = ld.players[0].logit_choice_cdfs
cdfs_computed = cdfs_computed / cdfs_computed[..., [-1]] # Normalized
assert_array_almost_equal_nulp(cdfs_computed, cdfs)
