megengine.functional.distributed.broadcast

broadcast(inp, group=WORLD, device=None)[源代码]

Broadcast tensor data from root process to others.

参数
  • inp (Tensor) – Input tensor.

  • group (Optional[Group]) – The process group to work on. The default group is WORLD which means all processes available. You can use a list of process ranks to create new group to work on it, e.g. [1, 3, 5].

  • device (Optional[str]) – The specific device to execute this operator. None default device means the device of inp will be used. Specify “gpu0:1” to execute this operator on diffrent cuda stream, 1 is stream id, and default stream id is 0.

返回类型

Tensor

返回

Result tensor.

实际案例

input = Tensor([rank])
# Rank 0 # input: Tensor([0])
# Rank 1 # input: Tensor([1])
output = broadcast(input)
# Rank 0 # output: Tensor([0])
# Rank 1 # output: Tensor([0])

input = Tensor([rank])
group = Group([1, 0]) # first rank is root
output = broadcast(input, group)
# Rank 0 # output: Tensor([1])
# Rank 1 # output: Tensor([1])