def get_errors(self, inputs, targets):

        l_targets = targets if type(targets) in (tuple, list) else [targets for c in self.costs]
        if self.errors is None:
            self.errors = [c.deltas for c in self.costs]

        for c, i, t in zip(self.costs, inputs, l_targets):
            c.get_errors(i, t)

        return self.errors
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