Create the operator via the following factory method:
***LLM.Dolly(model_name: str)***
**Parameters:**
***model_name***: *str*
The model name in string, defaults to 'databricks/dolly-v2-12b'. Supported model names:
- databricks/dolly-v2-12b
- databricks/dolly-v2-7b
- databricks/dolly-v2-3b
- databricks/dolly-v1-6b
***\*\*kwargs***
Other Dolly model parameters such as device_map.
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## Interface
The operator takes a piece of text in string as input.
It returns answer in json.
***\_\_call\_\_(txt)***
**Parameters:**
***messages***: *list*
A list of messages to set up chat.
Must be a list of dictionaries with key value from "system", "question", "answer". For example, [{"question": "a past question?", "answer": "a past answer."}, {"question": "current question?"}]