Challenge: Existing models that learn hierarchical structure information representations do not perform well on task-oriented dialog systems.
Approach: They propose a hierarchical structure information representation model that reinforces the semantic awareness of a pre-trained language model by a two-step fine-tuning mechanism.
Outcome: The proposed model is better than existing models at learning the contextual representations of utterances embedded within its hierarchical semantic structure and improves system performance.

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Challenge: Existing methods to fine-tune pre-trained language models are time-consuming and lack flexibility.
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