def test_checkpoint():
def train():
for i in range(2):
save_checkpoint(epoch=i)
def validate_zero(expected):
next = session.get_next()
assert next is not None
assert next.type == TrainingResultType.CHECKPOINT
assert next.data["epoch"] == expected
init_session(training_func=train, world_rank=0, local_rank=0)
session = get_session()
session.start()
validate_zero(0)
validate_zero(1)
session.finish()
shutdown_session()
def validate_nonzero():
next = session.get_next()
assert next is not None
assert next.type == TrainingResultType.CHECKPOINT
assert next.data == {}
init_session(training_func=train, world_rank=1, local_rank=1)
session = get_session()
session.start()
validate_nonzero()
validate_nonzero()
session.finish()
shutdown_session()
with pytest.raises(ValueError):
save_checkpoint(epoch=2)
def test_locking():
"""Tests that report pauses training until fetch_next or finish."""
def train_1():
import _thread
_thread.interrupt_main()
init_session(training_func=train_1, world_rank=0)
session = get_session()
with pytest.raises(KeyboardInterrupt):
session.start()
shutdown_session()
def train_2():
for i in range(2):
report(loss=i)
train_1()
init_session(training_func=train_2, world_rank=0)
session = get_session()
session.start()
time.sleep(3)
with pytest.raises(KeyboardInterrupt):
session.finish()
shutdown_session()
def session():
def f():
return 1
init_session(training_func=f, world_rank=0)
yield get_session()
shutdown_session()
def pause_reporting():
# Get the session for this worker.
try:
session = get_session()
except ValueError:
# Session is not initialized yet.
raise SGDBackendError("`finish_training` has been called "
"before `start_training`. Please call "
"`start_training` before "
"`finish_training`.")
return session.pause_reporting()
def test_report_fail():
def train():
for i in range(2):
report(i)
return 1
init_session(training_func=train, world_rank=0)
session = get_session()
session.start()
assert session.get_next() is None
with pytest.raises(TypeError):
session.finish()
shutdown_session()
def test_report():
def train():
for i in range(2):
report(loss=i)
init_session(training_func=train, world_rank=0)
session = get_session()
session.start()
assert session.get_next()["loss"] == 0
assert session.get_next()["loss"] == 1
shutdown_session()
with pytest.raises(ValueError):
report(loss=2)
def test_load_checkpoint_after_save():
def train():
for i in range(2):
save_checkpoint(epoch=i)
checkpoint = load_checkpoint()
assert checkpoint["epoch"] == i
init_session(training_func=train, world_rank=0, local_rank=0)
session = get_session()
session.start()
for i in range(2):
session.get_next()
session.finish()
shutdown_session()
def end_training():
# Get the session for this worker.
try:
session = get_session()
except ValueError:
# Session is not initialized yet.
raise SGDBackendError("`finish_training` has been called "
"before `start_training`. Please call "
"`start_training` before "
"`finish_training`.")
try:
# session.finish raises any Exceptions from training.
output = session.finish()
finally:
# Shutdown session even if session.finish() raises an
# Exception.
shutdown_session()
return output
def get_next():
# Get the session for this worker.
try:
session = get_session()
except ValueError:
# Session is not initialized yet.
raise SGDBackendError("`fetch_next_result` has been called "
"before `start_training`. Please call "
"`start_training` before "
"`fetch_next_result`.")
try:
result = session.get_next()
except RuntimeError:
# Training thread has not been started yet.
raise SGDBackendError("`fetch_next_result` has been called "
"before `start_training`. Please call "
"`start_training` before "
"`fetch_next_result`.")
return result
def train_async():
session = get_session()
session.start()
def test_get_fail(session):
shutdown_session()
with pytest.raises(ValueError):
get_session()
