def _create_multi_worker_mirrored():
tf_config = cluster_resolver.TFConfigClusterResolver()
master = tf_config.master()
if tf_config.rpc_layer:
# Strip off the rpc_layer suffix.
master = master[len("%s://" % tf_config.rpc_layer):]
resolver = cluster_resolver.SimpleClusterResolver(
cluster_spec=tf_config.cluster_spec(),
task_type=tf_config.task_type,
task_id=tf_config.task_id,
master=master,
environment=tf_config.environment,
num_accelerators={"GPU": required_gpus},
rpc_layer=tf_config.rpc_layer or "grpc",
)
# Always create the strategy in eager mode so that it starts the server and
# configures the eager context. The eager context can no longer be
# configured after initialization.
with context.eager_mode():
strategy = collective_all_reduce_strategy.CollectiveAllReduceStrategy(
cluster_resolver=resolver)
# TODO(b/152320929): Wait for the cluster before proceeding, otherwise
# collectives may hang if any worker launches collectives before the chief
# creates the strategy.
try:
multi_process_runner.barrier().wait()
except ValueError:
# If the creator is called in the main process,
# multi_process_runner.barrier() raises ValueError, which is safe to
# ignore.
pass
return strategy
def worker_fn():
enable_collective_ops(
cluster_resolver_lib.TFConfigClusterResolver())
# There may be some delays before the server startup. Check health should
# eventually be OK.
while True:
try:
for task in [
"/job:worker/replica:0/task:0",
"/job:worker/replica:0/task:1",
]:
context.context().check_collective_ops_peer_health(
task)
except errors.UnavailableError:
continue
break
multi_process_runner.barrier().wait()
def worker_step_fn(worker_id):
strategy = collective_all_reduce_strategy.CollectiveAllReduceStrategy()
# Make sure the processeses are in sync after updating the cluster
multi_process_runner.barrier().wait()
@def_function.function
def run_reduce():
with ops.device(self._local_device):
t_in = array_ops.ones(tensor_shape) * worker_id
return strategy.reduce(reduce_util.ReduceOp.MEAN, t_in, axis=None)
t_out = run_reduce()
# Element values from the workers are
# 0, 1, ..., (NUM_WORKERS - 1)
expected_mean = (NUM_WORKERS - 1) / 2
expected_out = np.ones(tensor_shape) * expected_mean
self.assertAllClose(t_out, expected_out)
def worker_step_fn(worker_id, num_dims):
strategy = collective_all_reduce_strategy.CollectiveAllReduceStrategy()
# Make sure the processeses are in sync after updating the cluster
multi_process_runner.barrier().wait()
tensor_shape = [2] * num_dims
def variable_fn():
with ops.device(self._local_device):
# The initial value will be broadcasted from worker 0 to others.
initial_value = (array_ops.ones(tensor_shape) if worker_id == 0 else
array_ops.zeros(tensor_shape))
var = variable_scope.get_variable(name='x', initializer=initial_value)
return array_ops.identity(var)
t_out = strategy.extended.call_for_each_replica(variable_fn)
expected_out = np.ones(tensor_shape)
self.assertAllClose(t_out, expected_out)
def proc_tensorboard_works_with_same_file_path(test_obj, saving_filepath):
model, _, train_ds, steps = _model_setup(test_obj, file_format='')
num_epoch = 2
# The saving_filepath shouldn't exist at the beginning (as it's unique).
test_obj.assertFalse(file_io.file_exists(saving_filepath))
multi_process_runner.barrier().wait()
model.fit(
x=train_ds,
epochs=num_epoch,
steps_per_epoch=steps,
callbacks=[callbacks.TensorBoard(log_dir=saving_filepath)])
multi_process_runner.barrier().wait()
test_obj.assertTrue(file_io.list_directory(saving_filepath))
def proc_model_checkpoint_works_with_same_file_path(test_obj,
saving_filepath):
model, _, train_ds, steps = _model_setup(test_obj, file_format='')
num_epoch = 4
# The saving_filepath shouldn't exist at the beginning (as it's unique).
test_obj.assertFalse(file_io.file_exists(saving_filepath))
bar_dir = os.path.join(os.path.dirname(saving_filepath), 'backup')
try:
model.fit(
x=train_ds,
epochs=num_epoch,
steps_per_epoch=steps,
callbacks=[
callbacks.ModelCheckpoint(filepath=saving_filepath),
callbacks.BackupAndRestore(backup_dir=bar_dir),
InterruptingCallback()
])
except RuntimeError as e:
if 'Interrupting!' not in str(e):
raise
multi_process_runner.barrier().wait()
backup_filepath = os.path.join(bar_dir, 'checkpoint')
test_obj.assertTrue(file_io.file_exists(backup_filepath))
test_obj.assertTrue(file_io.file_exists(saving_filepath))
model.fit(
x=train_ds,
epochs=num_epoch,
steps_per_epoch=steps,
callbacks=[
callbacks.ModelCheckpoint(filepath=saving_filepath),
callbacks.BackupAndRestore(backup_dir=bar_dir),
AssertCallback()
])
multi_process_runner.barrier().wait()
test_obj.assertFalse(file_io.file_exists(backup_filepath))
test_obj.assertTrue(file_io.file_exists(saving_filepath))
def _create_multi_worker_mirrored():
tf_config = cluster_resolver.TFConfigClusterResolver()
resolver = cluster_resolver.SimpleClusterResolver(
cluster_spec=tf_config.cluster_spec(),
task_type=tf_config.task_type,
task_id=tf_config.task_id,
environment=tf_config.environment,
num_accelerators={"GPU": required_gpus},
rpc_layer=tf_config.rpc_layer,
)
strategy = collective_all_reduce_strategy.CollectiveAllReduceStrategy(
cluster_resolver=resolver)
# TODO(b/152320929): Wait for the cluster before proceeding, otherwise
# collectives may hang if any worker launches collectives before the chief
# creates the strategy.
try:
multi_process_runner.barrier().wait()
except ValueError:
# If the creator is called in the main process,
# multi_process_runner.barrier() raises ValueError, which is safe to
# ignore.
pass
return strategy
def _create_multi_worker_mirrored():
tf_config = cluster_resolver.TFConfigClusterResolver()
master = tf_config.master()
if tf_config.rpc_layer:
# Strip off the rpc_layer suffix.
master = master[len("%s://" % tf_config.rpc_layer):]
resolver = cluster_resolver.SimpleClusterResolver(
cluster_spec=tf_config.cluster_spec(),
task_type=tf_config.task_type,
task_id=tf_config.task_id,
master=master,
environment=tf_config.environment,
num_accelerators={"GPU": required_gpus},
rpc_layer=tf_config.rpc_layer or "grpc",
)
# Disable health check. We don't have a reliable to shutdown the strategy
# (and thus the health check) at the end of a test. Turning on health check
# causes some flakiness since we re-create part of the server when creating
# a strategy, and our tests are capable of handling failures.
CollectiveAllReduceExtended._enable_check_health = False # pylint: disable=protected-access
# Always create the strategy in eager mode so that it starts the server and
# configures the eager context. The eager context can no longer be
# configured after initialization.
with context.eager_mode():
strategy = collective_all_reduce_strategy.CollectiveAllReduceStrategy(
cluster_resolver=resolver)
# TODO(b/152320929): Wait for the cluster before proceeding, otherwise
# collectives may hang if any worker launches collectives before the chief
# creates the strategy.
try:
multi_process_runner.barrier().wait()
except ValueError:
# If the creator is called in the main process,
# multi_process_runner.barrier() raises ValueError, which is safe to
# ignore.
pass
return strategy
def worker_fn(attempts):
strategy = tf.distribute.experimental.MultiWorkerMirroredStrategy()
task_id, attempt = get_attempt(strategy, attempts)
if attempt == 2 and task_id == 1:
multi_process_runner.barrier().wait()
@tf.function
def replica_fn():
ctx = tf.distribute.get_replica_context()
# Use a large tensor because small tensor may hang regardless when the
# worker recovers.
value = tf.ones((64, 64))
ctx.all_reduce(tf.distribute.ReduceOp.SUM, [value, value])
strategy.run(replica_fn)
# worker-1 dies here.
if attempt == 1 and task_id == 1:
quick_exit(1)
# Make worker-0 waits for worker-1 to restart before entering the next
# collective to simulate a quick recovery of worker-1.
if attempt == 1 and task_id == 0:
multi_process_runner.barrier().wait()
strategy.run(replica_fn)
def proc_func_with_barrier():
return multi_process_runner.barrier()
def test_barrier_called_in_main_process(self):
with self.assertRaises(ValueError):
multi_process_runner.barrier()
def proc_func(model_path, checkpoint_dir):
global_batch_size = per_worker_batch_size * num_workers
strategy = collective_all_reduce_strategy.CollectiveAllReduceStrategy(
)
with strategy.scope():
multi_worker_model = build_and_compile_cnn_model()
callbacks = [
keras.callbacks.ModelCheckpoint(
filepath=os.path.join(self.get_temp_dir(), 'checkpoint'))
]
multi_worker_dataset = mnist_dataset(global_batch_size)
if shard_policy:
options = dataset_ops.Options()
options.experimental_distribute.auto_shard_policy = shard_policy
multi_worker_dataset = multi_worker_dataset.with_options(
options)
multi_worker_model.fit(multi_worker_dataset,
epochs=2,
steps_per_epoch=20,
callbacks=callbacks)
def _is_chief(task_type, task_id):
return task_type is None or task_type == 'chief' or (
task_type == 'worker' and task_id == 0)
def _get_temp_dir(dirpath, task_id):
base_dirpath = 'workertemp_' + str(task_id)
temp_dir = os.path.join(dirpath, base_dirpath)
file_io.recursive_create_dir_v2(temp_dir)
return temp_dir
def write_filepath(filepath, task_type, task_id):
dirpath = os.path.dirname(filepath)
base = os.path.basename(filepath)
if not _is_chief(task_type, task_id):
dirpath = _get_temp_dir(dirpath, task_id)
return os.path.join(dirpath, base)
task_type, task_id = (strategy.cluster_resolver.task_type,
strategy.cluster_resolver.task_id)
write_model_path = write_filepath(model_path, task_type, task_id)
multi_worker_model.save(write_model_path)
if not _is_chief(task_type, task_id):
file_io.delete_recursively_v2(
os.path.dirname(write_model_path))
# Make sure chief finishes saving before non-chief's assertions.
multi_process_runner.barrier().wait()
if not file_io.file_exists_v2(model_path):
raise RuntimeError()
if file_io.file_exists_v2(write_model_path) != _is_chief(
task_type, task_id):
raise RuntimeError()
loaded_model = keras.saving.save.load_model(model_path)
loaded_model.fit(multi_worker_dataset,
epochs=2,
steps_per_epoch=20)
checkpoint = tracking_util.Checkpoint(model=multi_worker_model)
write_checkpoint_dir = write_filepath(checkpoint_dir, task_type,
task_id)
checkpoint_manager = checkpoint_management.CheckpointManager(
checkpoint, directory=write_checkpoint_dir, max_to_keep=1)
checkpoint_manager.save()
if not _is_chief(task_type, task_id):
file_io.delete_recursively_v2(write_checkpoint_dir)
# Make sure chief finishes saving before non-chief's assertions.
multi_process_runner.barrier().wait()
if not file_io.file_exists_v2(checkpoint_dir):
raise RuntimeError()
if file_io.file_exists_v2(write_checkpoint_dir) != _is_chief(
task_type, task_id):
raise RuntimeError()
latest_checkpoint = checkpoint_management.latest_checkpoint(
checkpoint_dir)
checkpoint.restore(latest_checkpoint)
multi_worker_model.fit(multi_worker_dataset,
epochs=2,
steps_per_epoch=20)
logging.info('testMultiWorkerTutorial successfully ends')
def fn_with_barrier():
return multi_process_runner.barrier()