python.context-manager

null_context_manager

Note

Tags: python.context-manager

Support Level: SUPPORTED

Original source code:

import contextlib

import torch



def null_context_manager(x):
    """
    Null context manager in Python will be traced out.
    """
    ctx = contextlib.nullcontext()
    with ctx:
        return x.sin() + x.cos()

Result:

ExportedProgram:
    class GraphModule(torch.nn.Module):
        def forward(self, l_x_: "f32[3, 2]"):
                sin: "f32[3, 2]" = torch.ops.aten.sin.default(l_x_)
            cos: "f32[3, 2]" = torch.ops.aten.cos.default(l_x_);  l_x_ = None
            add: "f32[3, 2]" = torch.ops.aten.add.Tensor(sin, cos);  sin = cos = None
            return (add,)

Graph signature: ExportGraphSignature(input_specs=[InputSpec(kind=<InputKind.USER_INPUT: 1>, arg=TensorArgument(name='l_x_'), target=None)], output_specs=[OutputSpec(kind=<OutputKind.USER_OUTPUT: 1>, arg=TensorArgument(name='add'), target=None)])
Range constraints: {}
Equality constraints: []