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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 should_checkpoint(self):
 """Whether this trial is due for checkpointing."""

        result = self.last_result or {}

        if result.get(DONE) and self.checkpoint_at_end:
            return True

        if self.checkpoint_freq:
            return result.get(TRAINING_ITERATION,
                              0) % self.checkpoint_freq == 0
        else:
            return False