def test_basic_get_infection_multiplier():
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
model._prepare_to_run()
model._prepare_time_step(0, model.initial_population)
c_src = model.compartments[0]
c_dst = model.compartments[1]
multiplier = model._get_infection_frequency_multiplier(c_src, c_dst)
assert multiplier == 10 / 1000
multiplier = model._get_infection_density_multiplier(c_src, c_dst)
assert multiplier == 10
def test_strat_get_infection_multiplier__with_age_strat_and_no_mixing():
"""
Check FoI when a simple 2-strata stratification applied and no mixing matrix.
Expect the same results as with the basic case.
"""
# Create a model
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
model.stratify_with(strat)
assert model._mixing_categories == [{}]
# Do pre-run force of infection calcs.
model._prepare_to_run()
assert_array_equal(model._compartment_infectiousness["default"],
np.array([0.0, 0.0, 1.0, 1.0, 0.0, 0.0]))
assert_array_equal(model._category_matrix,
np.array([[1.0, 1.0, 1.0, 1.0, 1.0, 1.0]]))
assert model._category_lookup == {0: 0, 1: 0, 2: 0, 3: 0, 4: 0, 5: 0}
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
assert_array_equal(model._category_populations, np.array([1000]))
assert_array_equal(model._infection_density["default"], np.array([10.0]))
assert_array_equal(model._infection_frequency["default"], np.array([0.01]))
# Get multipliers
s_child = model.compartments[0]
s_adult = model.compartments[1]
i_child = model.compartments[2]
i_adult = model.compartments[3]
assert model._get_infection_density_multiplier(s_child, i_child) == 10.0
assert model._get_infection_density_multiplier(s_adult, i_adult) == 10.0
assert model._get_infection_frequency_multiplier(s_child, i_child) == 0.01
assert model._get_infection_frequency_multiplier(s_adult, i_adult) == 0.01
# Santiy check frequency-dependent force of infection
assert 1000.0 * 0.01 == 10
def test_strat_get_infection_multiplier__with_double_strat_and_both_strats_mixing(
):
"""
Check FoI when a two 2-strata stratification applied and both stratifications have a mixing matrix.
"""
# Create the model
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
strat.set_population_split({"child": 0.3, "adult": 0.7})
am = np.array([[2, 3], [5, 7]])
strat.set_mixing_matrix(am)
model.stratify_with(strat)
strat = Stratification("location", ["work", "home"], ["S", "I", "R"])
lm = np.array([[11, 13], [17, 19]])
strat.set_mixing_matrix(lm)
model.stratify_with(strat)
expected_mixing = np.array([
[2 * 11, 2 * 13, 3 * 11, 3 * 13],
[2 * 17, 2 * 19, 3 * 17, 3 * 19],
[5 * 11, 5 * 13, 7 * 11, 7 * 13],
[5 * 17, 5 * 19, 7 * 17, 7 * 19],
])
assert_array_equal(model._get_mixing_matrix(0), expected_mixing)
assert model._mixing_categories == [
{
"age": "child",
"location": "work"
},
{
"age": "child",
"location": "home"
},
{
"age": "adult",
"location": "work"
},
{
"age": "adult",
"location": "home"
},
]
assert model.compartments == [
C("S", {
"age": "child",
"location": "work"
}),
C("S", {
"age": "child",
"location": "home"
}),
C("S", {
"age": "adult",
"location": "work"
}),
C("S", {
"age": "adult",
"location": "home"
}),
C("I", {
"age": "child",
"location": "work"
}),
C("I", {
"age": "child",
"location": "home"
}),
C("I", {
"age": "adult",
"location": "work"
}),
C("I", {
"age": "adult",
"location": "home"
}),
C("R", {
"age": "child",
"location": "work"
}),
C("R", {
"age": "child",
"location": "home"
}),
C("R", {
"age": "adult",
"location": "work"
}),
C("R", {
"age": "adult",
"location": "home"
}),
]
expected_comp_vals = np.array(
[148.5, 148.5, 346.5, 346.5, 1.5, 1.5, 3.5, 3.5, 0, 0, 0, 0])
assert_array_equal(model.initial_population, expected_comp_vals)
# Do pre-run force of infection calcs.
model._prepare_to_run()
exp_lookup = {
0: 0, # S age: child location: work -> children at work
1: 1, # S age: child location: home -> children at home
2: 2, # S age: adult location: work -> adults at work
3: 3, # S age: adult location: home -> adults at home
4: 0, # I age: child location: work -> children at work
5: 1, # I age: child location: home -> children at home
6: 2, # I age: adult location: work -> adults at work
7: 3, # I age: adult location: home -> adults at home
8: 0, # R age: child location: work -> children at work
9: 1, # R age: child location: home -> children at home
10: 2, # R age: adult location: work -> adults at work
11: 3, # R age: adult location: home -> adults at home
}
exp_matrix = np.array([
[1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0], # children at work
[0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0], # children at home
[0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0], # adults at work
[0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1], # adults at home
])
exp_mults = np.array([0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0])
assert_array_equal(model._compartment_infectiousness["default"], exp_mults)
assert_array_equal(model._category_matrix, exp_matrix)
assert model._category_lookup == exp_lookup
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
exp_pops = np.array([
150, # children at work
150, # children at home
350, # adults at work
350, # adults at home
])
assert_array_equal(model._category_populations, exp_pops)
child_work_density = 2 * 11 * 1.5 + 2 * 13 * 1.5 + 3 * 11 * 3.5 + 3 * 13 * 3.5
child_home_density = 2 * 17 * 1.5 + 2 * 19 * 1.5 + 3 * 17 * 3.5 + 3 * 19 * 3.5
adult_work_density = 5 * 11 * 1.5 + 5 * 13 * 1.5 + 7 * 11 * 3.5 + 7 * 13 * 3.5
adult_home_density = 5 * 17 * 1.5 + 5 * 19 * 1.5 + 7 * 17 * 3.5 + 7 * 19 * 3.5
child_work_freq = (2 * 11 * 1.5 / 150 + 2 * 13 * 1.5 / 150 +
3 * 11 * 3.5 / 350 + 3 * 13 * 3.5 / 350)
child_home_freq = (2 * 17 * 1.5 / 150 + 2 * 19 * 1.5 / 150 +
3 * 17 * 3.5 / 350 + 3 * 19 * 3.5 / 350)
adult_work_freq = (5 * 11 * 1.5 / 150 + 5 * 13 * 1.5 / 150 +
7 * 11 * 3.5 / 350 + 7 * 13 * 3.5 / 350)
adult_home_freq = (5 * 17 * 1.5 / 150 + 5 * 19 * 1.5 / 150 +
7 * 17 * 3.5 / 350 + 7 * 19 * 3.5 / 350)
exp_density = np.array([
child_work_density, # children at work
child_home_density, # children at home
adult_work_density, # adults at work
adult_home_density, # adults at home
])
exp_frequency = np.array([
child_work_freq, # children at work
child_home_freq, # children at home
adult_work_freq, # adults at work
adult_home_freq, # adults at home
])
assert_array_equal(model._infection_density["default"], exp_density)
assert_allclose(model._infection_frequency["default"],
exp_frequency,
rtol=0,
atol=1e-9)
# Get multipliers
s_child_work = model.compartments[0]
s_child_home = model.compartments[1]
s_adult_work = model.compartments[2]
s_adult_home = model.compartments[3]
i_child_work = model.compartments[4]
i_child_home = model.compartments[5]
i_adult_work = model.compartments[6]
i_adult_home = model.compartments[7]
assert (abs(
model._get_infection_density_multiplier(s_child_work, i_child_work) -
child_work_density) <= 1e-9)
assert (abs(
model._get_infection_density_multiplier(s_child_home, i_child_home) -
child_home_density) <= 1e-9)
assert (abs(
model._get_infection_density_multiplier(s_adult_work, i_adult_work) -
adult_work_density) <= 1e-9)
assert (abs(
model._get_infection_density_multiplier(s_adult_home, i_adult_home) -
adult_home_density) <= 1e-9)
assert (abs(
model._get_infection_frequency_multiplier(s_child_work, i_child_work) -
child_work_freq) <= 1e-9)
assert (abs(
model._get_infection_frequency_multiplier(s_child_home, i_child_home) -
child_home_freq) <= 1e-9)
assert (abs(
model._get_infection_frequency_multiplier(s_adult_work, i_adult_work) -
adult_work_freq) <= 1e-9)
assert (abs(
model._get_infection_frequency_multiplier(s_adult_home, i_adult_home) -
adult_home_freq) <= 1e-9)
def test_strat_get_infection_multiplier__with_age_strat_and_simple_mixing():
"""
Check FoI when a simple 2-strata stratification applied AND heteregeneous mixing.
Expect same frequency as before, different density.
Note that the mixing matrix has different meanings for density / vs frequency.
N.B Mixing matrix format.
Columns are the people who are infectors
Rows are the people who are infected
So matrix has following values
child adult
child child -> child adult -> child
adult child -> adult adult -> adult
"""
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
mixing_matrix = np.array([[0.5, 0.5], [0.5, 0.5]])
strat.set_mixing_matrix(mixing_matrix)
model.stratify_with(strat)
assert model._mixing_categories == [{"age": "child"}, {"age": "adult"}]
assert model.compartments == [
C("S", {"age": "child"}),
C("S", {"age": "adult"}),
C("I", {"age": "child"}),
C("I", {"age": "adult"}),
C("R", {"age": "child"}),
C("R", {"age": "adult"}),
]
assert_array_equal(model.initial_population,
np.array([495, 495, 5, 5, 0.0, 0.0]))
# Do pre-run force of infection calcs.
model._prepare_to_run()
assert_array_equal(model._compartment_infectiousness["default"],
np.array([0.0, 0.0, 1.0, 1.0, 0.0, 0.0]))
assert_array_equal(
model._category_matrix,
np.array([[1.0, 0.0, 1.0, 0.0, 1.0, 0.0],
[0.0, 1.0, 0.0, 1.0, 0.0, 1.0]]),
)
assert model._category_lookup == {0: 0, 1: 1, 2: 0, 3: 1, 4: 0, 5: 1}
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
child_density = 5
adult_density = 5
assert child_density == 0.5 * 5 + 0.5 * 5
assert adult_density == 0.5 * 5 + 0.5 * 5
assert_array_equal(model._infection_density["default"],
np.array([child_density, adult_density]))
child_freq = 0.01
adult_freq = 0.01
assert child_freq == child_density / 500
assert adult_freq == adult_density / 500
assert_array_equal(model._infection_frequency["default"],
np.array([child_freq, adult_freq]))
# Get multipliers
s_child = model.compartments[0]
s_adult = model.compartments[1]
i_child = model.compartments[2]
i_adult = model.compartments[3]
assert model._get_infection_density_multiplier(s_child,
i_child) == child_density
assert model._get_infection_density_multiplier(s_adult,
i_adult) == adult_density
assert model._get_infection_frequency_multiplier(s_child,
i_child) == child_freq
assert model._get_infection_frequency_multiplier(s_adult,
i_adult) == adult_freq
# Santiy check frequency-dependent force of infection
assert 500.0 * child_freq + 500.0 * adult_freq == 10
def test_strat_get_infection_multiplier__with_double_strat_and_second_strat_mixing(
):
"""
Check FoI when a two 2-strata stratification applied and the second stratification has a mixing matrix.
"""
# Create the model
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
strat.set_population_split({"child": 0.3, "adult": 0.7})
model.stratify_with(strat)
strat = Stratification("location", ["work", "home"], ["S", "I", "R"])
location_mixing = np.array([[2, 3], [5, 7]])
strat.set_mixing_matrix(location_mixing)
model.stratify_with(strat)
assert model._mixing_categories == [{
"location": "work"
}, {
"location": "home"
}]
assert model.compartments == [
C("S", {
"age": "child",
"location": "work"
}),
C("S", {
"age": "child",
"location": "home"
}),
C("S", {
"age": "adult",
"location": "work"
}),
C("S", {
"age": "adult",
"location": "home"
}),
C("I", {
"age": "child",
"location": "work"
}),
C("I", {
"age": "child",
"location": "home"
}),
C("I", {
"age": "adult",
"location": "work"
}),
C("I", {
"age": "adult",
"location": "home"
}),
C("R", {
"age": "child",
"location": "work"
}),
C("R", {
"age": "child",
"location": "home"
}),
C("R", {
"age": "adult",
"location": "work"
}),
C("R", {
"age": "adult",
"location": "home"
}),
]
expected_comp_vals = np.array(
[148.5, 148.5, 346.5, 346.5, 1.5, 1.5, 3.5, 3.5, 0, 0, 0, 0])
assert_array_equal(model.initial_population, expected_comp_vals)
# Do pre-run force of infection calcs.
model._prepare_to_run()
exp_lookup = {
0: 0,
1: 1,
2: 0,
3: 1,
4: 0,
5: 1,
6: 0,
7: 1,
8: 0,
9: 1,
10: 0,
11: 1
}
exp_matrix = np.array([
[1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
[0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1],
])
exp_mults = np.array([0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0])
assert_array_equal(model._compartment_infectiousness["default"], exp_mults)
assert_array_equal(model._category_matrix, exp_matrix)
assert model._category_lookup == exp_lookup
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
assert_array_equal(model._category_populations, np.array([500.0, 500.0]))
work_density = 25
home_density = 60
assert work_density == 2 * 5 + 3 * 5
assert home_density == 5 * 5 + 7 * 5
assert_array_equal(model._infection_density["default"],
np.array([work_density, home_density]))
work_freq = 2 * 5 / 500 + 3 * 5 / 500
home_freq = 5 * 5 / 500 + 7 * 5 / 500
assert_array_equal(model._infection_frequency["default"],
np.array([work_freq, home_freq]))
# Get multipliers
s_child_work = model.compartments[0]
s_child_home = model.compartments[1]
s_adult_work = model.compartments[2]
s_adult_home = model.compartments[3]
i_child_work = model.compartments[4]
i_child_home = model.compartments[5]
i_adult_work = model.compartments[6]
i_adult_home = model.compartments[7]
assert model._get_infection_density_multiplier(
s_child_work, i_child_work) == work_density
assert model._get_infection_density_multiplier(
s_child_home, i_child_home) == home_density
assert model._get_infection_density_multiplier(
s_adult_work, i_adult_work) == work_density
assert model._get_infection_density_multiplier(
s_adult_home, i_adult_home) == home_density
assert model._get_infection_frequency_multiplier(s_child_work,
i_child_work) == work_freq
assert model._get_infection_frequency_multiplier(s_child_home,
i_child_home) == home_freq
assert model._get_infection_frequency_multiplier(s_adult_work,
i_adult_work) == work_freq
assert model._get_infection_frequency_multiplier(s_adult_home,
i_adult_home) == home_freq
def test_strat_get_infection_multiplier__with_double_strat_and_no_mixing():
"""
Check FoI when a two 2-strata stratificationz applied and no mixing matrix.
Expect the same results as with the basic case.
"""
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
model.stratify_with(strat)
strat = Stratification("location", ["work", "home"], ["S", "I", "R"])
model.stratify_with(strat)
assert model._mixing_categories == [{}]
assert model.compartments == [
C("S", {
"age": "child",
"location": "work"
}),
C("S", {
"age": "child",
"location": "home"
}),
C("S", {
"age": "adult",
"location": "work"
}),
C("S", {
"age": "adult",
"location": "home"
}),
C("I", {
"age": "child",
"location": "work"
}),
C("I", {
"age": "child",
"location": "home"
}),
C("I", {
"age": "adult",
"location": "work"
}),
C("I", {
"age": "adult",
"location": "home"
}),
C("R", {
"age": "child",
"location": "work"
}),
C("R", {
"age": "child",
"location": "home"
}),
C("R", {
"age": "adult",
"location": "work"
}),
C("R", {
"age": "adult",
"location": "home"
}),
]
expected_comp_vals = np.array(
[247.5, 247.5, 247.5, 247.5, 2.5, 2.5, 2.5, 2.5, 0, 0, 0, 0])
assert_array_equal(model.initial_population, expected_comp_vals)
# Do pre-run force of infection calcs.
model._prepare_to_run()
expected_compartment_infectiousness = np.array(
[0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0])
expected_category_matrix = np.array([[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]])
expected_lookup = {n: 0 for n in range(12)}
assert_array_equal(model._compartment_infectiousness["default"],
expected_compartment_infectiousness)
assert_array_equal(model._category_matrix, expected_category_matrix)
assert model._category_lookup == expected_lookup
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
assert_array_equal(model._category_populations, np.array([1000]))
assert_array_equal(model._infection_density["default"], np.array([10.0]))
assert_array_equal(model._infection_frequency["default"], np.array([0.01]))
s_child_work = model.compartments[0]
s_child_home = model.compartments[1]
s_adult_work = model.compartments[2]
s_adult_home = model.compartments[3]
i_child_work = model.compartments[4]
i_child_home = model.compartments[5]
i_adult_work = model.compartments[6]
i_adult_home = model.compartments[7]
assert model._get_infection_density_multiplier(s_child_work,
i_child_work) == 10.0
assert model._get_infection_density_multiplier(s_child_home,
i_child_home) == 10.0
assert model._get_infection_density_multiplier(s_adult_work,
i_adult_work) == 10.0
assert model._get_infection_density_multiplier(s_adult_home,
i_adult_home) == 10.0
assert model._get_infection_frequency_multiplier(s_child_work,
i_child_work) == 0.01
assert model._get_infection_frequency_multiplier(s_child_home,
i_child_home) == 0.01
assert model._get_infection_frequency_multiplier(s_adult_work,
i_adult_work) == 0.01
assert model._get_infection_frequency_multiplier(s_adult_home,
i_adult_home) == 0.01
def test_strat_get_infection_multiplier__with_age_strat_and_mixing():
"""
Check FoI when a simple 2-strata stratification applied AND heteregeneous mixing.
Use a non-uniform mixing matrix
"""
# Create a model
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
mixing_matrix = np.array([[2, 3], [5, 7]])
strat.set_mixing_matrix(mixing_matrix)
strat.set_population_split({"child": 0.2, "adult": 0.8})
model.stratify_with(strat)
assert model._mixing_categories == [{"age": "child"}, {"age": "adult"}]
assert model.compartments == [
C("S", {"age": "child"}),
C("S", {"age": "adult"}),
C("I", {"age": "child"}),
C("I", {"age": "adult"}),
C("R", {"age": "child"}),
C("R", {"age": "adult"}),
]
assert_array_equal(model.initial_population,
np.array([198.0, 792.0, 2.0, 8.0, 0.0, 0.0]))
# Do pre-run force of infection calcs.
model._prepare_to_run()
assert_array_equal(model._compartment_infectiousness["default"],
np.array([0.0, 0.0, 1.0, 1.0, 0.0, 0.0]))
assert_array_equal(
model._category_matrix,
np.array([[1.0, 0.0, 1.0, 0.0, 1.0, 0.0],
[0.0, 1.0, 0.0, 1.0, 0.0, 1.0]]),
)
assert model._category_lookup == {0: 0, 1: 1, 2: 0, 3: 1, 4: 0, 5: 1}
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
assert_array_equal(model._category_populations, np.array([200.0, 800.0]))
child_density = 28
adult_density = 66
assert child_density == 2 * 2.0 + 3 * 8.0
assert adult_density == 5 * 2.0 + 7 * 8.0
assert_array_equal(model._infection_density["default"],
np.array([child_density, adult_density]))
child_freq = 0.05
adult_freq = 0.12000000000000001
assert child_freq == 2 * 2.0 / 200 + 3 * 8.0 / 800
assert adult_freq == 5 * 2.0 / 200 + 7 * 8.0 / 800
assert_array_equal(model._infection_frequency["default"],
np.array([child_freq, adult_freq]))
# Get multipliers
s_child = model.compartments[0]
s_adult = model.compartments[1]
i_child = model.compartments[2]
i_adult = model.compartments[3]
assert model._get_infection_density_multiplier(s_child,
i_child) == child_density
assert model._get_infection_density_multiplier(s_adult,
i_adult) == adult_density
assert model._get_infection_frequency_multiplier(s_child,
i_child) == child_freq
assert model._get_infection_frequency_multiplier(s_adult,
i_adult) == adult_freq
def test_strat_get_infection_multiplier__with_age_split_and_simple_mixing():
"""
Check FoI when a simple 2-strata stratification applied AND heteregeneous mixing.
Unequally split the children and adults.
Expect same density as before, different frequency.
Note that the mixing matrix has different meanings for density / vs frequency.
"""
# Create a model
model = CompartmentalModel(times=[0, 5],
compartments=["S", "I", "R"],
infectious_compartments=["I"])
model.set_initial_population(distribution={"S": 990, "I": 10})
strat = Stratification("age", ["child", "adult"], ["S", "I", "R"])
mixing_matrix = np.array([[0.5, 0.5], [0.5, 0.5]])
strat.set_mixing_matrix(mixing_matrix)
strat.set_population_split({"child": 0.2, "adult": 0.8})
model.stratify_with(strat)
assert model._mixing_categories == [{"age": "child"}, {"age": "adult"}]
assert model.compartments == [
C("S", {"age": "child"}),
C("S", {"age": "adult"}),
C("I", {"age": "child"}),
C("I", {"age": "adult"}),
C("R", {"age": "child"}),
C("R", {"age": "adult"}),
]
assert_array_equal(model.initial_population,
np.array([198.0, 792.0, 2.0, 8.0, 0.0, 0.0]))
# Do pre-run force of infection calcs.
model._prepare_to_run()
assert_array_equal(model._compartment_infectiousness["default"],
np.array([0.0, 0.0, 1.0, 1.0, 0.0, 0.0]))
assert_array_equal(
model._category_matrix,
np.array([[1.0, 0.0, 1.0, 0.0, 1.0, 0.0],
[0.0, 1.0, 0.0, 1.0, 0.0, 1.0]]),
)
assert model._category_lookup == {0: 0, 1: 1, 2: 0, 3: 1, 4: 0, 5: 1}
# Do pre-iteration force of infection calcs
model._prepare_time_step(0, model.initial_population)
child_density = 5
adult_density = 5
assert child_density == 0.5 * 5 + 0.5 * 5
assert adult_density == 0.5 * 5 + 0.5 * 5
assert_array_equal(model._infection_density["default"],
np.array([child_density, adult_density]))
child_freq = 0.01
adult_freq = 0.01
assert child_freq == 0.5 * 2 / 200 + 0.5 * 8 / 800
assert adult_freq == 0.5 * 2 / 200 + 0.5 * 8 / 800
assert_array_equal(model._infection_frequency["default"],
np.array([child_freq, adult_freq]))
# Get multipliers
s_child = model.compartments[0]
s_adult = model.compartments[1]
i_child = model.compartments[2]
i_adult = model.compartments[3]
assert model._get_infection_density_multiplier(s_child,
i_child) == child_density
assert model._get_infection_density_multiplier(s_adult,
i_adult) == adult_density
assert model._get_infection_frequency_multiplier(s_child,
i_child) == child_freq
assert model._get_infection_frequency_multiplier(s_adult,
i_adult) == adult_freq
# Santiy check frequency-dependent force of infection
assert 200.0 * child_freq + 800.0 * adult_freq == 10