def _remote_fn(v):
# We run two collectives here to make sure we cancel in the middle of the
# RemoteCall. The second one should never finish.
anchor = collective_ops.all_reduce_v2(
v, group_size=2, group_key=1, instance_key=1)
with ops.control_dependencies([anchor]):
return collective_ops.all_reduce_v2(
v, group_size=2, group_key=1, instance_key=2)
def fn(x, y):
t0 = collective_ops.all_reduce_v2(t=x,
group_size=2,
group_key=1,
instance_key=1)
t1 = collective_ops.all_reduce_v2(t=y,
group_size=2,
group_key=1,
instance_key=1)
return t0 + t1
def all_reduce(self,
input_tensor,
control_input=None,
communication_hint='AUTO',
timeout=0):
"""All-reduce a dense tensor.
Args:
input_tensor: a dense tensor. It must have the same shape on all replicas.
control_input: if not None, add control edges between control_input and
the all-reduce.
communication_hint: string providing hint to runtime for choosing
collective implementation.
timeout: a float. The timeout in seconds.
Returns:
The reduced tensor.
"""
instance_key = self._next_instance_key()
ordering_token = self._get_ordering_token(communication_hint)
with ops.device(self._device), \
self._control_input(control_input):
return collective_ops.all_reduce_v2(
input_tensor,
self._group_size,
self._group_key,
instance_key,
communication_hint=communication_hint,
timeout=timeout,
ordering_token=ordering_token)
def all_reduce(
self,
input_tensor: core.TensorLike,
control_input: Optional[Union[core.TensorLike,
ops.Operation]] = None,
options: Optional[collective_util.Options] = None) -> core.Tensor:
"""All-reduce a dense tensor.
Args:
input_tensor: a dense tensor. It must have the same shape on all replicas.
control_input: if not None, add control edges between control_input and
the all-reduce.
options: an optional tf.distribute.experimental.CommunicationOptions. If
provided, it overrides the default options.
Returns:
The reduced tensor.
"""
instance_key = self._next_instance_key()
options = self._options.merge(options)
ordering_token = self._get_ordering_token(options)
with ops.device(self._device), \
self._control_input(control_input):
return collective_ops.all_reduce_v2(
input_tensor,
self._group_size,
self._group_key,
instance_key,
communication_hint=options.implementation.value,
timeout=options.timeout_seconds,
ordering_token=ordering_token)
def all_reduce_sum(v):
return collective_ops.all_reduce_v2(t=v,
group_size=2,
group_key=1,
instance_key=1,
merge_op='Add',
final_op='Id')
def fn(x):
group_key = collective_ops.assign_group_v2(
group_assignment=[[0]], device_index=0)
t0 = collective_ops.all_reduce_v2(t=x,
group_size=1,
group_key=group_key,
instance_key=1)
return t0
def _reduce_tensor(tensor):
with _COUNTER_LOCK:
global _COUNTER
keys = _COUNTER
_COUNTER += 1
return collective_ops.all_reduce_v2(t=tensor,
group_size=num_replicas,
merge_op=operation,
group_key=keys,
instance_key=keys)
def testRemoteFunctionCancellation(self):
context._reset_context()
logical_devices = []
logical_devices.append(context.LogicalDeviceConfiguration())
logical_devices.append(context.LogicalDeviceConfiguration())
framework_config.set_logical_device_configuration(
framework_config.list_physical_devices("CPU")[0], logical_devices)
@function.Defun(dtypes.float32)
def _remote_fn(v):
# We run two collectives here to make sure we cancel in the middle of the
# RemoteCall. The second one should never finish.
anchor = collective_ops.all_reduce_v2(
v, group_size=2, group_key=1, instance_key=1)
with ops.control_dependencies([anchor]):
return collective_ops.all_reduce_v2(
v, group_size=2, group_key=1, instance_key=2)
@eager_def_function.function
def run():
with ops.device("/cpu:0"):
return functional_ops.remote_call(
args=[constant_op.constant([1.])],
Tout=[dtypes.float32],
f=_remote_fn,
target="/cpu:1")[0]
async_executor = executor.new_executor(enable_async=True)
cancel_mgr = cancellation.CancellationManager()
with context.executor_scope(async_executor):
# This should never finish.
cancel_mgr.get_cancelable_function(run.get_concrete_function())()
with ops.device("/cpu:0"):
collective_ops.all_reduce_v2([1.],
group_size=2,
group_key=1,
instance_key=1)
cancel_mgr.start_cancel()
with self.assertRaises(errors.CancelledError):
async_executor.wait()
def all_reduce(self,
input_tensor,
control_input=None,
communication_hint='AUTO',
timeout=0):
"""All-reduce a dense tensor.
This can be called in eager mode if a async executor is supplied when
creating the launcher.
Args:
input_tensor: a dense tensor. It must have the same shape on all replicas.
control_input: if not None, add control edges between control_input and
the all-reduce.
communication_hint: string providing hint to runtime for choosing
collective implementation.
timeout: a float. The timeout in seconds.
Returns:
The reduced tensor.
"""
instance_key = self._next_instance_key()
ordering_token = self._get_ordering_token(communication_hint)
with self._executor_scope(), \
ops.device(self._device), \
self._control_input(control_input):
if self._should_use_collective_v2():
return collective_ops.all_reduce_v2(
input_tensor,
self._group_size,
self._group_key,
instance_key,
communication_hint=communication_hint,
timeout=timeout,
ordering_token=ordering_token)
else:
return collective_ops.all_reduce(
input_tensor,
self._group_size,
self._group_key,
instance_key,
communication_hint=communication_hint,
timeout=timeout)
def all_reduce(t, group_size, group_key, instance_key, *args, **kwargs):
group_size = array_ops.identity(group_size)
group_key = array_ops.identity(group_key)
instance_key = array_ops.identity(instance_key)
return _collective_ops.all_reduce_v2(t, group_size, group_key,
instance_key, *args, **kwargs)
def f():
return _collective_ops.all_reduce_v2([1.], group_size,
group_key, instance_key)
def collective_fn(t):
# Run a dummy collective of group size 1 to test the setup.
return collective_ops.all_reduce_v2(
t, group_size=1, group_key=1, instance_key=1)