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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def recover_cfg(self, start=None, end=None, symbols=None, callback=None, arch_mode=None):
 """Recover CFG. Args: start (int):
 Start address. end (int):
 End address. symbols (dict):
 Symbol table. callback (function):
 A callback function which is called after each successfully recovered CFG. arch_mode (int):
 Architecture mode. Returns: ControlFlowGraph: A CFG. """

        # Set architecture in case it wasn't already set.
        if arch_mode is None:
            arch_mode = self.binary.architecture_mode

        # Reload modules.
        self._load(arch_mode=arch_mode)

        # Check start address.
        start = start if start else self.binary.entry_point

        cfg, _ = self._recover_cfg(start=start, end=end, symbols=symbols, callback=callback)

        return cfg