def test_max_failures(ray_start_2_cpus):
test_config = TestConfig()
def train_func():
import sys
sys.exit(0)
trainer = Trainer(test_config, num_workers=2)
trainer.start()
iterator = trainer.run_iterator(train_func)
with pytest.raises(RuntimeError):
iterator.get_final_results(force=True)
assert iterator._executor._num_failures == 3
def test_no_exhaust(ray_start_2_cpus, tmp_path):
"""Tests if training can finish even if queue is not exhausted."""
def train_func():
for _ in range(2):
train.report(loss=1)
return 2
config = TestConfig()
trainer = Trainer(config, num_workers=2)
trainer.start()
iterator = trainer.run_iterator(train_func)
output = iterator.get_final_results(force=True)
assert output == [2, 2]
def test_run_iterator_error(ray_start_2_cpus):
config = TestConfig()
def fail_train():
raise NotImplementedError
trainer = Trainer(config, num_workers=2)
trainer.start()
iterator = trainer.run_iterator(fail_train)
with pytest.raises(NotImplementedError):
next(iterator)
assert iterator.get_final_results() is None
assert iterator.is_finished()
def test_run_iterator_returns(ray_start_2_cpus):
config = TestConfig()
def train_func():
for i in range(3):
train.report(index=i)
return 1
trainer = Trainer(config, num_workers=2)
trainer.start()
iterator = trainer.run_iterator(train_func)
assert iterator.get_final_results() is None
assert iterator.get_final_results(force=True) == [1, 1]
with pytest.raises(StopIteration):
next(iterator)
def main(num_workers=1, use_gpu=False):
mlflow.set_experiment("train_torch_fashion_mnist")
trainer = Trainer(
backend="torch", num_workers=num_workers, use_gpu=use_gpu)
trainer.start()
iterator = trainer.run_iterator(
train_func=train_func,
config={
"lr": 1e-3,
"batch_size": 64,
"epochs": 4
})
for intermediate_result in iterator:
first_worker_result = intermediate_result[0]
mlflow.log_metric("loss", first_worker_result["loss"])
print("Full losses for rank 0 worker: ", iterator.get_final_results())
def test_run_iterator(ray_start_2_cpus):
config = TestConfig()
def train_func():
for i in range(3):
train.report(index=i)
return 1
trainer = Trainer(config, num_workers=2)
trainer.start()
iterator = trainer.run_iterator(train_func)
count = 0
for results in iterator:
assert all(value["index"] == count for value in results)
count += 1
assert count == 3
assert iterator.is_finished()
assert iterator.get_final_results() == [1, 1]
with pytest.raises(StopIteration):
next(iterator)
