device_guard

paddle.static. device_guard ( device=None ) [源代码]

注解

该 API 仅支持静态图模式。

一个用于指定 OP 运行设备的上下文管理器。

参数

  • device (str|None) – 指定上下文中使用的设备。它可以是 cpugpugpu:x,其中 x 是 GPU 的编号。当它被设置为 cpu 或者 gpu 时,创建在该上下文中的 OP 将被运行在 CPUPlace 或者 CUDAPlace 上。若设置为 gpu,同时程序运行在单卡模式下,设备的索引将与执行器的设备索引保持一致,默认值:None,在该上下文中的 OP 将被自动地分配设备。

代码示例

>>> import paddle
>>> paddle.device.set_device('gpu')
>>> paddle.enable_static()
>>> support_gpu = paddle.is_compiled_with_cuda()
>>> place = paddle.CPUPlace()
>>> if support_gpu:
...     place = paddle.CUDAPlace(0)

>>> # if GPU is supported, the three OPs below will be automatically assigned to CUDAPlace(0)
>>> data1 = paddle.full(shape=[1, 3, 8, 8], fill_value=0.5, dtype='float32')
>>> data2 = paddle.full(shape=[1, 3, 64], fill_value=0.5, dtype='float32')
>>> shape = paddle.shape(data2)

>>> with paddle.static.device_guard("cpu"):
...     # Ops created here will be placed on CPUPlace
...     shape = paddle.slice(shape, axes=[0], starts=[0], ends=[4])
>>> with paddle.static.device_guard('gpu'):
...     # if GPU is supported, OPs created here will be placed on CUDAPlace(0), otherwise on CPUPlace
...     out = paddle.reshape(data1, shape=shape)

>>> exe = paddle.static.Executor(place)
>>> exe.run(paddle.static.default_startup_program())
>>> result = exe.run(fetch_list=[out])