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Abstract base class for callables.
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Perform the computation and return the result. Override this method with a concrete implementation. |
Return a fork of this callable, e.g. by making a copy. This method is always used before a callable is actually called, so instead of the original callable the fork is called. The ensures that the original callable is preserved when cachin is used. If the callable is not modified by the call it can simply return itself. |
This hook method is called when the callable is first loaded. It should be used to make any required modifications in the Python environment that are required by this callable. |
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