def test_nested_context():
ctx1_data = {'max_dur': 30}
ctx2_data = {'max_steps': 5}
ctx1 = StepwiseContext(**ctx1_data)
ctx2 = StepwiseContext(**ctx2_data)
with ctx1, ctx2:
effective_ctx_data = ContextStore.get_or_empty(ContextType.STEPWISE)
expected_ctx_data = ctx1_data.copy()
expected_ctx_data.update(ctx2_data)
assert all(effective_ctx_data[key] == expected_ctx_data[key]
for key in expected_ctx_data.keys())
assert all(effective_ctx_data[key] == expected_ctx_data[key]
for key in effective_ctx_data.keys())
def test_max_dur():
# set arbitrarily low to guarantee will always pass after one iter
with StepwiseContext(max_dur=.5), \
pytest.warns(UserWarning) as uw:
auto_arima(lynx, stepwise=True)
# assert that max_dur was reached
assert any(str(w.message).startswith('early termination') for w in uw)
def push(n):
# n is the number of times this has been executed before. If > 0,
# assert there is a context there
if n > 0:
assert len(context_lib._ctx.store[ContextType.STEPWISE]) == n
else:
context_lib._ctx.store[ContextType.STEPWISE] = \
collections.deque()
new_ctx = StepwiseContext()
context_lib._ctx.store[ContextType.STEPWISE].append(new_ctx)
assert len(context_lib._ctx.store[ContextType.STEPWISE]) == n + 1
def test_subsequent_contexts():
# Force a very fast fit
with StepwiseContext(max_dur=.5), \
pytest.warns(UserWarning):
auto_arima(lynx, stepwise=True)
# Out of scope, should be EMPTY
assert ContextStore.get_or_empty(ContextType.STEPWISE).get_type() \
is ContextType.EMPTY
# Now show that we DON'T hit early termination by time here
with StepwiseContext(max_steps=100), \
pytest.warns(UserWarning) as uw:
ctx = ContextStore.get_or_empty(ContextType.STEPWISE)
assert ctx.get_type() is ContextType.STEPWISE
assert ctx.max_dur is None
auto_arima(lynx, stepwise=True)
# assert that max_dur was NOT reached
assert not any(
str(w.message).startswith('early termination') for w in uw)
def test_auto_arima_with_stepwise_context():
samp = lynx[:8]
with StepwiseContext(max_steps=3, max_dur=30):
with pytest.warns(UserWarning) as uw:
auto_arima(samp,
suppress_warnings=False,
stepwise=True,
error_action='ignore')
# assert that max_steps were taken
assert any(
str(w.message).startswith('stepwise search has reached the '
'maximum number of tries')
for w in uw)
def test_stepwise_context_args(max_steps, max_dur):
with pytest.raises(ValueError):
StepwiseContext(max_steps=max_steps, max_dur=max_dur)
