How to discriminate the type of a data(a numpy or tensor)

def to_array_as(x, y):    
    if isinstance(x, torch.Tensor) and isinstance(y, np.ndarray):
        return x.detach().cpu().numpy().astype(y.dtype)
    elif isinstance(x, np.ndarray) and isinstance(y, torch.Tensor):
        return torch.as_tensor(x).to(y)
    else:
        return x