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project_name: Label Studio project name
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Examples:
>>> from langchain_community.llms import OpenAI
>>> from langchain_community.callbacks import LabelStudioCallbackHandler
>>> handler = LabelStudioCallbackHandler(
... api_key='',
... url='http://localhost:8080',
... project_name='LangChain-%Y-%m-%d',
... mode='prompt'
... )
>>> llm = OpenAI(callbacks=[handler])
>>> llm.invoke('Tell me a story about a dog.')
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