def create_sequence_pipeline(layers: list[RemoteModuleParams],
balance: list[int], devices: list[str],
**kwargs) -> DistributedPipeline:
"""A simple helper function to create a pipeline from list of pipeline-modules that run sequentially.
Args:
layers: list of modules. They should not be already assigned a remote-device.
balance: a list of integers how layers should be paritioned. Sum of numbers in 'balance'
should be equal to the number of layers.
devices: specification of remote device for each partition. Should be of the same length
as 'balance'.
"""
remote_modules: list[RemoteModule] = []
index = 0
for num_layers, remote_device in zip(balance, devices):
next_index = index + num_layers
for li in range(index, next_index):
remote_modules.append(
RemoteModule(remote_device, **layers[li]._asdict()))
index = next_index
graph = PipelineModulesGraph()
graph.add_sequence(remote_modules, [0])
return DistributedPipeline(graph, **kwargs)
def multi_input_multi_output_layers(devices):
device = devices[0].split("/")[1]
torch.random.manual_seed(3)
criterion = DistributedLoss(torch.nn.MSELoss)
x = torch.randn(8, 4).to(device)
# / ->linear_layer_2_1
# input -> linear_layer1 -> split ->concatenate
# \ ->linear_layer_2_2
linear_layer_1 = RemoteModule(devices[0], nn.Linear, (4, 4), {})
split = RemoteModule(devices[0], SplitTensors, (), {})
linear_layers_2 = [
RemoteModule(devices[0], nn.Linear, (2, 2), {}),
RemoteModule(devices[1], nn.Linear, (2, 2), {}),
]
concatenate = RemoteModule(devices[1], ConcatenateTensors, ())
graph = PipelineModulesGraph()
graph.add_sequence([linear_layer_1, split])
graph.set_model_input(linear_layer_1)
graph.fan_out(split, linear_layers_2)
graph.add_multi_input_layer(concatenate, linear_layers_2)
pipe = DistributedPipeline(graph, chunks=4)
assert [[0, 1], [2], [3], [4]] == extract_partitions(graph, pipe)
params = pipe.parameter_rrefs()
opt = DistributedOptimizer(torch.optim.SGD, pipe.parameter_rrefs(), lr=0.05,)
losses = []
for i in range(2):
with dist_autograd.context() as context_id:
y = pipe(x)
loss = criterion(y, rpc.RRef(x))
losses.append(loss)
loss.backward(context_id)
opt.step(context_id)
losses = [l.to_here() for l in losses]
assert losses[0] > losses[1], f"{losses[0]} !> {losses[1]}"