[Python] I tried substituting the function name for the function name


The assigned one will be rewritten to the assigned one. Below are the experimental results.


#Define func
def func(x, y):
  return x - y

func(1, 2) # -1

#Define func0
def func0():
  return None

func0() #No output

#Substitute the function name for the function name
func0 = func

func(1, 3) # -2

func0(1, 3) # -2

Why did you investigate this

For some reason, the __call__method of the Module class of PyTorch was set to be set with _call_impl once and then assigned to __call__ as described above. Can anyone please tell me why PyTorch made such a troublesome description (seriously). Below is the source code.


def _call_impl(self, *input, **kwargs):
        for hook in itertools.chain(
            result = hook(self, input)
            if result is not None:
                if not isinstance(result, tuple):
                    result = (result,)
                input = result
        if torch._C._get_tracing_state():
            result = self._slow_forward(*input, **kwargs)
            result = self.forward(*input, **kwargs)
        for hook in itertools.chain(
            hook_result = hook(self, input, result)
            if hook_result is not None:
                result = hook_result
        if (len(self._backward_hooks) > 0) or (len(_global_backward_hooks) > 0):
            var = result
            while not isinstance(var, torch.Tensor):
                if isinstance(var, dict):
                    var = next((v for v in var.values() if isinstance(v, torch.Tensor)))
                    var = var[0]
            grad_fn = var.grad_fn
            if grad_fn is not None:
                for hook in itertools.chain(
                    wrapper = functools.partial(hook, self)
                    functools.update_wrapper(wrapper, hook)
        return result

    __call__ : Callable[..., Any] = _call_impl

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