torch.nn.modules.module.register_module_full_backward_hook¶
-
torch.nn.modules.module.
register_module_full_backward_hook
(hook)[source]¶ Registers a backward hook common to all the modules.
Warning
This adds global state to the nn.module module and it is only intended for debugging/profiling purposes.
The hook will be called every time the gradients with respect to module inputs are computed. The hook should have the following signature:
hook(module, grad_input, grad_output) -> Tensor or None
The
grad_input
andgrad_output
are tuples. The hook should not modify its arguments, but it can optionally return a new gradient with respect to the input that will be used in place ofgrad_input
in subsequent computations.grad_input
will only correspond to the inputs given as positional arguments and all kwarg arguments will not appear in the hook. Entries ingrad_input
andgrad_output
will beNone
for all non-Tensor arguments.For technical reasons, when this hook is applied to a Module, its forward function will receive a view of each Tensor passed to the Module. Similarly the caller will receive a view of each Tensor returned by the Module’s forward function.
Global hooks are called before hooks registered with register_backward_hook
- Returns
a handle that can be used to remove the added hook by calling
handle.remove()
- Return type
torch.utils.hooks.RemovableHandle