set_grad_enabled¶

class paddle. set_grad_enabled ( mode ) [source]

Create a context which enables or disables dygraph gradient calculation.

Parameters

mode (bool) – whether to enable (True), or disable (False) grad.

Returns

None.

Examples

>>> import paddle
>>> x = paddle.to_tensor([1.], stop_gradient=False)
>>> is_train = False
>>> with paddle.set_grad_enabled(is_train):
...     y = x * 2
>>> print(y.stop_gradient)
True

>>> paddle.set_grad_enabled(True)
>>> y = x * 2
>>> print(y.stop_gradient)
False

>>> paddle.set_grad_enabled(False)
>>> y = x * 2
>>> print(y.stop_gradient)
True