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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 reset(self):
 """Clear the internal statistics to initial state."""

        if getattr(self, 'num', None) is None:
            self.num_inst = 0
            self.sum_metric = 0.0
        else:
            self.num_inst = [0] * self.num
            self.sum_metric = [0.0] * self.num
        self.records = dict()
        self.counts = dict()