def test_denormaliser_middle():
"""Confirm that input equal to 0 is denormalised to half way between x_min and x_max"""
x_min = 10
x_max = 20
normaliser = Normaliser(x_min=x_min, x_max=x_max)
normalised_input = normaliser.denormalise(0.)
expected_output = (x_min + x_max) / 2.
assert normalised_input == expected_output
def test_denormaliser_maximum():
"""Confirm that input equal to +1 is denormalised to x_max"""
x_min = 10
x_max = 20
normaliser = Normaliser(x_min=x_min, x_max=x_max)
normalised_input = normaliser.denormalise(1.)
expected_output = x_max
assert normalised_input == expected_output
def test_normaliser_out_of_range():
"""Confirm that input greater than +1 is denormalised to a value proportionately greater than x_max"""
x_min = 10
x_max = 20
normaliser = Normaliser(x_min=x_min, x_max=x_max)
input = 2.
normalised_input = normaliser.denormalise(input)
expected_output = x_max + (input - 1) * 0.5 * (x_max - x_min)
assert normalised_input == expected_output
def test_denormaliser_minimum():
"""Confirm that input equal to -1. is denormalised to x_min"""
normaliser = Normaliser(x_min=10, x_max=20)
denormalised_input = normaliser.denormalise(-1.)
expected_output = 10
assert denormalised_input == expected_output