mirror of https://github.com/hwchase17/langchain
Add from_file method to message prompt template (#4713)
**Feature**: This PR adds `from_template_file` class method to BaseStringMessagePromptTemplate. This is useful to help user to create message prompt templates directly from template files, including `ChatMessagePromptTemplate`, `HumanMessagePromptTemplate`, `AIMessagePromptTemplate` & `SystemMessagePromptTemplate`. **Tests**: Unit tests have been added in this PR. Co-authored-by: charosen <charosen@bupt.cn> Co-authored-by: Dev 2049 <dev.dev2049@gmail.com>pull/4655/head
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