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# 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, arg0_1: f32[3, 2]):
                #
                sin: f32[3, 2] = torch.ops.aten.sin.default(arg0_1)
                cos: f32[3, 2] = torch.ops.aten.cos.default(arg0_1);  arg0_1 = None
                add: f32[3, 2] = torch.ops.aten.add.Tensor(sin, cos);  sin = cos = None
                return (add,)

    Graph Signature: ExportGraphSignature(parameters=[], buffers=[], user_inputs=['arg0_1'], user_outputs=['add'], inputs_to_parameters={}, inputs_to_buffers={}, buffers_to_mutate={}, backward_signature=None, assertion_dep_token=None)
    Symbol to range: {}

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