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test_parameters.py
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test_parameters.py
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import copy
import numpy as np
import psyneulink as pnl
import pytest
import re
import warnings
def shared_parameter_warning_regex(param_name, shared_name=None):
if shared_name is None:
shared_name = param_name
return (
f'Specification of the "{param_name}" parameter.*conflicts'
f' with specification of its shared parameter "{shared_name}"'
)
# (ancestor, child, should_override)
ancestor_child_data = [
(pnl.Component, pnl.TransferMechanism, False),
(pnl.Component, pnl.OutputPort, False),
(pnl.Component, pnl.InputPort, True),
(pnl.Component, pnl.SimpleIntegrator, False),
(pnl.Function_Base, pnl.SimpleIntegrator, True),
(pnl.TransferMechanism, pnl.RecurrentTransferMechanism, True)
]
# (obj, param_name, alias_name)
param_alias_data = [
(pnl.Linear, 'slope', 'multiplicative_param'),
(pnl.Linear, 'intercept', 'additive_param'),
(pnl.ControlMechanism, 'value', 'control_allocation'),
]
@pytest.fixture(scope='function')
def reset_variable(*args):
yield
# pytest cannot provide the exact parametrized arguments to fixtures
# so just reset all of the possibilities
# this must be used when altering class level defaults
for item in ancestor_child_data:
item[0].parameters.variable.reset()
item[1].parameters.variable.reset()
@pytest.mark.parametrize('ancestor, child', [(item[0], item[1]) for item in ancestor_child_data])
def test_parameter_propagation(ancestor, child):
for param in ancestor.parameters:
child_params = child.parameters.values(show_all=True)
assert param.name in child_params
@pytest.mark.parametrize('ancestor, child, should_override', ancestor_child_data)
def test_parameter_values_overriding(ancestor, child, should_override, reset_variable):
original_child_variable = child.parameters.variable.default_value
# ancestor updates
ancestor.parameters.variable = -1
assert ancestor.parameters.variable.default_value == -1
if should_override:
assert child.parameters.variable.default_value == -1
else:
assert child.parameters.variable.default_value == original_child_variable
# child updates and ancestor does not update
child.parameters.variable = -2
assert child.parameters.variable.default_value == -2
assert ancestor.parameters.variable.default_value == -1
# child should not get overridden because it is explicitly specified
ancestor.parameters.variable = -3
assert child.parameters.variable.default_value == -2
# revert to original behavior
child.parameters.variable.reset()
if should_override:
assert child.parameters.variable.default_value == -3
else:
assert child.parameters.variable.default_value == original_child_variable
@pytest.mark.parametrize('obj, param_name, alias_name', param_alias_data)
def test_aliases(obj, param_name, alias_name):
obj = obj()
assert obj.parameters._owner is obj
assert getattr(obj.parameters, alias_name)._owner._owner is obj
assert getattr(obj.defaults, param_name) == getattr(obj.defaults, alias_name)
# if hasattr(getattr(obj.parameters, alias_name), 'source'):
assert getattr(obj.parameters, alias_name).source is getattr(obj.parameters, param_name)
@pytest.mark.parametrize('obj, param_name, alias_name', param_alias_data)
def test_aliases_set_source(obj, param_name, alias_name):
obj = obj()
setattr(obj.defaults, param_name, -100)
assert getattr(obj.defaults, param_name) == getattr(obj.defaults, alias_name)
@pytest.mark.parametrize('obj, param_name, alias_name', param_alias_data)
def test_aliases_set_alias(obj, param_name, alias_name):
obj = obj()
setattr(obj.defaults, alias_name, -1)
assert getattr(obj.defaults, param_name) == getattr(obj.defaults, alias_name)
def test_parameter_getter():
f = pnl.Linear()
f.parameters.slope.getter = lambda x: x ** 2
assert f.parameters.slope.get(x=3) == 9
def test_parameter_setter():
f = pnl.Linear()
f.parameters.slope.setter = lambda x: x ** 2
f.parameters.slope.set(3)
assert f.parameters.slope.get() == 9
def test_history():
t = pnl.TransferMechanism()
assert t.parameters.value.get_previous() is None
t.execute(10)
assert t.parameters.value.get_previous() == 0
t.execute(100)
assert t.parameters.value.get_previous() == 10
@pytest.mark.parametrize(
'index, range_start, range_end, expected',
[
(1, None, None, 4),
(6, None, None, None),
(None, 2, None, [3, 4]),
(None, 2, 0, [3, 4]),
(1, 2, 0, [3, 4]),
(None, 5, 2, [0, 1, 2]),
(None, 10, 2, [0, 1, 2])
]
)
def test_get_previous(index, range_start, range_end, expected):
t = pnl.TransferMechanism()
t.parameters.value.history_max_length = 10
for i in range(1, 6):
t.execute(i)
previous = t.parameters.value.get_previous(
index=index,
range_start=range_start,
range_end=range_end,
)
assert previous == expected
def test_delta():
t = pnl.TransferMechanism()
t.execute(10)
assert t.parameters.value.get_delta() == 10
t.execute(100)
assert t.parameters.value.get_delta() == 90
def test_delta_fail():
t = pnl.TransferMechanism()
t.parameters.value.set(None, override=True)
t.execute(10)
with pytest.raises(TypeError) as error:
t.parameters.value.get_delta()
assert "Parameter 'value' value mismatch between current" in str(error.value)
def test_validation():
class NewTM(pnl.TransferMechanism):
class Parameters(pnl.TransferMechanism.Parameters):
variable = pnl.Parameter(np.array([[0], [0], [0]]), read_only=True)
def _validate_variable(self, variable):
if not isinstance(variable, np.ndarray) or not variable.shape == np.array([[0], [0], [0]]).shape:
return 'must be 2d numpy array of shape (3, 1)'
t = NewTM()
t.defaults.variable = np.array([[1], [2], [3]])
t.parameters.variable.default_value = np.array([[1], [2], [3]])
with pytest.raises(pnl.ParameterError):
t.defaults.variable = 0
with pytest.raises(pnl.ParameterError):
t.defaults.variable = np.array([0])
with pytest.raises(pnl.ParameterError):
t.parameters.variable.default_value = 0
with pytest.raises(pnl.ParameterError):
t.parameters.variable.default_value = np.array([[0]])
def test_dot_notation():
c = pnl.Composition()
d = pnl.Composition()
t = pnl.TransferMechanism()
c.add_node(t)
d.add_node(t)
t.execute(1)
assert t.value == 1
c.run({t: 5})
assert t.value == 5
d.run({t: 10})
assert t.value == 10
c.run({t: 20}, context='custom execution id')
assert t.value == 20
# context None
assert t.parameters.value.get() == 1
assert t.parameters.value.get(c) == 5
assert t.parameters.value.get(d) == 10
assert t.parameters.value.get('custom execution id') == 20
def test_copy():
f = pnl.Linear()
g = copy.deepcopy(f)
assert isinstance(g.parameters.additive_param, pnl.ParameterAlias)
assert g.parameters.additive_param.source is g.parameters.intercept
@pytest.mark.parametrize(
'cls_, kwargs, parameter, is_user_specified',
[
(pnl.AdaptiveIntegrator, {'rate': None}, 'rate', False),
(pnl.AdaptiveIntegrator, {'rate': None}, 'multiplicative_param', False),
(pnl.AdaptiveIntegrator, {'rate': 0.5}, 'rate', True),
(pnl.AdaptiveIntegrator, {'rate': 0.5}, 'multiplicative_param', True),
(pnl.TransferMechanism, {'integration_rate': None}, 'integration_rate', False),
(pnl.TransferMechanism, {'integration_rate': 0.5}, 'integration_rate', True),
]
)
def test_user_specified(cls_, kwargs, parameter, is_user_specified):
c = cls_(**kwargs)
assert getattr(c.parameters, parameter)._user_specified == is_user_specified
@pytest.mark.parametrize(
'kwargs, parameter, is_user_specified',
[
({'function': pnl.Linear}, 'slope', False),
({'function': pnl.Linear()}, 'slope', False),
({'function': pnl.Linear(slope=1)}, 'slope', True),
]
)
def test_function_user_specified(kwargs, parameter, is_user_specified):
t = pnl.TransferMechanism(**kwargs)
assert getattr(t.function.parameters, parameter)._user_specified == is_user_specified
class TestSharedParameters:
recurrent_mech = pnl.RecurrentTransferMechanism(default_variable=[0, 0], enable_learning=True)
recurrent_mech_no_learning = pnl.RecurrentTransferMechanism(default_variable=[0, 0])
transfer_with_costs = pnl.TransferWithCosts(default_variable=[0, 0])
test_values = [
(
recurrent_mech,
'learning_function',
recurrent_mech.learning_mechanism.parameters.function
),
(
recurrent_mech,
'learning_rate',
recurrent_mech.learning_mechanism.parameters.learning_rate
),
(
transfer_with_costs,
'transfer_fct_mult_param',
transfer_with_costs.transfer_fct.parameters.multiplicative_param
)
]
@pytest.mark.parametrize(
'obj, parameter_name, source',
test_values + [
(recurrent_mech_no_learning, 'learning_function', None),
]
)
def test_sources(self, obj, parameter_name, source):
assert getattr(obj.parameters, parameter_name).source is source
@pytest.mark.parametrize(
'obj, parameter_name, source',
test_values
)
def test_values(self, obj, parameter_name, source):
obj_param = getattr(obj.parameters, parameter_name)
eids = range(5)
for eid in eids:
obj.execute(np.array([eid, eid]), context=eid)
assert all([
obj_param.get(eid) is source.get(eid)
for eid in eids
])
@pytest.mark.parametrize(
'obj, parameter_name, attr_name',
[
(transfer_with_costs, 'intensity_cost_fct_mult_param', 'modulable'),
(recurrent_mech, 'learning_function', 'stateful'),
(recurrent_mech, 'learning_function', 'loggable'),
(recurrent_mech.recurrent_projection, 'auto', 'modulable'),
(recurrent_mech, 'integration_rate', 'modulable'),
(recurrent_mech, 'noise', 'modulable'),
]
)
def test_param_attrs_match(self, obj, parameter_name, attr_name):
shared_param = getattr(obj.parameters, parameter_name)
source_param = shared_param.source
assert getattr(shared_param, attr_name) == getattr(source_param, attr_name)
@pytest.mark.parametrize(
'integrator_function, expected_rate',
[
(pnl.AdaptiveIntegrator, pnl.TransferMechanism.defaults.integration_rate),
(pnl.AdaptiveIntegrator(), pnl.TransferMechanism.defaults.integration_rate),
(pnl.AdaptiveIntegrator(rate=.75), .75)
]
)
def test_override_tmech(self, integrator_function, expected_rate):
t = pnl.TransferMechanism(integrator_function=integrator_function)
assert t.integrator_function.defaults.rate == expected_rate
assert t.integration_rate.modulated == t.integration_rate.base == expected_rate
def test_conflict_warning(self):
with pytest.warns(
UserWarning,
match=shared_parameter_warning_regex('integration_rate', 'rate')
):
pnl.TransferMechanism(
integration_rate=.1,
integrator_function=pnl.AdaptiveIntegrator(rate=.2)
)
@pytest.mark.parametrize(
'mech_type, param_name, shared_param_name, param_value',
[
(pnl.LCAMechanism, 'noise', 'noise', pnl.GaussianDistort),
(pnl.LCAMechanism, 'noise', 'noise', pnl.GaussianDistort()),
(pnl.TransferMechanism, 'noise', 'noise', pnl.NormalDist),
(pnl.TransferMechanism, 'noise', 'noise', pnl.NormalDist()),
(pnl.TransferMechanism, 'noise', 'noise', [pnl.NormalDist()]),
]
)
def test_conflict_no_warning(
self,
mech_type,
param_name,
shared_param_name,
param_value
):
# pytest doesn't support inverse warning assertion for specific
# warning only
with warnings.catch_warnings():
warnings.simplefilter(action='error', category=UserWarning)
try:
mech_type(**{param_name: param_value})
except UserWarning as w:
if re.match(shared_parameter_warning_regex(param_name, shared_param_name), str(w)):
raise
def test_conflict_no_warning_parser(self):
# replace with different class/parameter if _parse_noise ever implemented
assert not hasattr(pnl.AdaptiveIntegrator.Parameters, '_parse_noise')
pnl.AdaptiveIntegrator.Parameters._parse_noise = lambda self, noise: 2 * noise
# pytest doesn't support inverse warning assertion for specific
# warning only
with warnings.catch_warnings():
warnings.simplefilter(action='error', category=UserWarning)
try:
pnl.TransferMechanism(
noise=2,
integrator_function=pnl.AdaptiveIntegrator(noise=1)
)
except UserWarning as w:
if re.match(shared_parameter_warning_regex('noise'), str(w)):
raise
delattr(pnl.AdaptiveIntegrator.Parameters, '_parse_noise')