cornercf

class definition is missed

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here code `from metrics.classification import MaskedAccuracy` in tasks/roberta_lm/trainer.py cannot match to definition.

[Feature][Module: ChatData] return structured table info

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### Search before asking - [X] I had searched in the [issues](https://github.com/eosphoros-ai/DB-GPT/issues?q=is%3Aissue) and found no similar feature requirement. ### Description when call DBSummaryClient.get_db_summary, this function return a formatted string for...