torch.mutation

user_input_mutation

Note

Tags: torch.mutation

Support Level: SUPPORTED

Original source code:

# mypy: allow-untyped-defs
import torch


class UserInputMutation(torch.nn.Module):
    """
    Directly mutate user input in forward
    """

    def forward(self, x):
        x.mul_(2)
        return x.cos()


example_args = (torch.randn(3, 2),)
tags = {"torch.mutation"}
model = UserInputMutation()


torch.export.export(model, example_args)

Result:

ExportedProgram:
    class GraphModule(torch.nn.Module):
        def forward(self, x: "f32[3, 2]"):
                 mul_: "f32[3, 2]" = torch.ops.aten.mul_.Tensor(x, 2);  x = None

                 cos: "f32[3, 2]" = torch.ops.aten.cos.default(mul_);  mul_ = None
            return (cos,)

Graph signature:
    # inputs
    x: USER_INPUT

    # outputs
    cos: USER_OUTPUT

Range constraints: {}