def _test(duration_vals_as_np_int):
scheduler_1 = LinearCyclicalScheduler(optimizer, "lr", start_value=1.0, end_value=0.0, cycle_size=10)
scheduler_2 = CosineAnnealingScheduler(optimizer, "lr", start_value=0.0, end_value=1.0, cycle_size=10)
durations = [10]
if duration_vals_as_np_int:
durations = [np.int64(t) for t in durations]
concat_scheduler = ConcatScheduler(
schedulers=[scheduler_1, scheduler_2], durations=durations, save_history=True
)
state_dict = concat_scheduler.state_dict()
data = [0] * 10
max_epochs = 2
simulated_values = ConcatScheduler.simulate_values(
num_events=len(data) * max_epochs, schedulers=[scheduler_1, scheduler_2], durations=durations
)
def save_lr(engine):
lrs.append(optimizer.param_groups[0]["lr"])
trainer = Engine(lambda engine, batch: None)
trainer.add_event_handler(Events.ITERATION_STARTED, concat_scheduler)
trainer.add_event_handler(Events.ITERATION_COMPLETED, save_lr)
for _ in range(2):
lrs = []
trainer.run(data, max_epochs=max_epochs)
assert lrs == list(
map(
pytest.approx,
[
# Cycle 1 of the LinearCyclicalScheduler
1.0,
0.8,
0.6,
0.4,
0.2,
0.0,
0.2,
0.4,
0.6,
0.8,
# Cycle 1 of the CosineAnnealingScheduler
0.0,
0.02447174185242318,
0.09549150281252627,
0.20610737385376332,
0.3454915028125263,
0.5,
0.6545084971874737,
0.7938926261462365,
0.9045084971874737,
0.9755282581475768,
],
)
)
state_lrs = trainer.state.param_history["lr"]
assert len(state_lrs) == len(lrs)
# Unpack singleton lists
assert [group[0] for group in state_lrs] == lrs
assert lrs == pytest.approx([v for i, v in simulated_values])
concat_scheduler.load_state_dict(state_dict)
trainer.state.param_history = None
def test_concat_scheduler_3_schedulers():
tensor = torch.zeros([1], requires_grad=True)
optimizer = torch.optim.SGD([tensor], lr=0)
scheduler_1 = LinearCyclicalScheduler(optimizer, "lr", start_value=1.0, end_value=0.5, cycle_size=20)
scheduler_2 = LinearCyclicalScheduler(optimizer, "lr", start_value=0.5, end_value=0.45, cycle_size=10)
scheduler_3 = LinearCyclicalScheduler(optimizer, "lr", start_value=0.5, end_value=0.0, cycle_size=20)
durations = [10, 5]
concat_scheduler = ConcatScheduler(
schedulers=[scheduler_1, scheduler_2, scheduler_3], durations=durations, save_history=True
)
state_dict = concat_scheduler.state_dict()
data = [0] * 10
max_epochs = 2
simulated_values = ConcatScheduler.simulate_values(
num_events=len(data) * max_epochs, schedulers=[scheduler_1, scheduler_2, scheduler_3], durations=durations
)
def save_lr(engine):
lrs.append(optimizer.param_groups[0]["lr"])
trainer = Engine(lambda engine, batch: None)
trainer.add_event_handler(Events.ITERATION_STARTED, concat_scheduler)
trainer.add_event_handler(Events.ITERATION_COMPLETED, save_lr)
for _ in range(2):
lrs = []
trainer.run(data, max_epochs=max_epochs)
assert lrs == list(
map(
pytest.approx,
[
# Cycle 1 of the first LinearCyclicalScheduler
1.0,
0.95,
0.9,
0.85,
0.8,
0.75,
0.7,
0.65,
0.6,
0.55,
# Cycle 1 of the second LinearCyclicalScheduler
0.5,
0.49,
0.48,
0.47,
0.46,
# Cycle 1 of the third LinearCyclicalScheduler
0.5,
0.45,
0.4,
0.35,
0.3,
],
)
)
state_lrs = trainer.state.param_history["lr"]
assert len(state_lrs) == len(lrs)
# Unpack singleton lists
assert [group[0] for group in state_lrs] == lrs
assert lrs == pytest.approx([v for i, v in simulated_values])
concat_scheduler.load_state_dict(state_dict)
trainer.state.param_history = None
def test_concat_scheduler_two_linear():
tensor = torch.zeros([1], requires_grad=True)
optimizer = torch.optim.SGD([tensor], lr=0)
scheduler_1 = LinearCyclicalScheduler(optimizer,
"lr",
start_value=0.0,
end_value=0.1,
cycle_size=2)
scheduler_2 = LinearCyclicalScheduler(optimizer,
"lr",
start_value=0.2,
end_value=1.0,
cycle_size=2)
durations = [
5,
]
concat_scheduler = ConcatScheduler(schedulers=[scheduler_1, scheduler_2],
durations=durations,
save_history=True)
state_dict = concat_scheduler.state_dict()
assert concat_scheduler.get_param() == 0.0
data = [0] * 10
max_epochs = 2
simulated_values = ConcatScheduler.simulate_values(
num_events=len(data) * max_epochs,
schedulers=[scheduler_1, scheduler_2],
durations=durations)
def save_lr(engine):
lrs.append(optimizer.param_groups[0]['lr'])
trainer = Engine(lambda engine, batch: None)
trainer.add_event_handler(Events.ITERATION_STARTED, concat_scheduler)
trainer.add_event_handler(Events.ITERATION_COMPLETED, save_lr)
for _ in range(2):
lrs = []
trainer.run(data, max_epochs=max_epochs)
assert lrs == list(
map(
pytest.approx,
[
# first LinearCyclicalScheduler
0.0,
0.1,
0.0,
0.1,
0.0,
# second LinearCyclicalScheduler
0.2,
1.0,
0.2,
1.0,
0.2,
1.0,
0.2,
1.0,
0.2,
1.0,
0.2,
1.0,
0.2,
1.0,
0.2,
]))
state_lrs = trainer.state.param_history['lr']
assert len(state_lrs) == len(lrs)
# Unpack singleton lists
assert [group[0] for group in state_lrs] == lrs
assert lrs == pytest.approx([v for i, v in simulated_values])
concat_scheduler.load_state_dict(state_dict)