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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 initialize_criterion(self):
 """Initializes the criterion."""

        criterion_params = self._get_params_for('criterion')
        self.criterion_ = self.criterion(**criterion_params)
        if isinstance(self.criterion_, torch.nn.Module):
            self.criterion_ = self.criterion_.to(self.device)
        return self