# torch.jit.script_if_tracing¶

torch.jit.script_if_tracing(fn)[source]

Compiles fn when it is first called during tracing. torch.jit.script has a non-negligible start up time when it is first called due to lazy-initializations of many compiler builtins. Therefore you should not use it in library code. However, you may want to have parts of your library work in tracing even if they use control flow. In these cases, you should use @torch.jit.script_if_tracing to substitute for torch.jit.script.

Parameters

fn – A function to compile.

Returns

If called during tracing, a ScriptFunction created by torch.jit.script is returned. Otherwise, the original function fn is returned.