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when the LLMs output 'yes|no',BooleanOutputParser can parse it to 'True|False', fix the ValueError in parse(). <!-- when use the BooleanOutputParser in the chain_filter.py, the LLMs output 'yes|no',the function 'parse' will throw ValueError。 --> Fixes # (issue) #5396 https://github.com/hwchase17/langchain/issues/5396 --------- Co-authored-by: gaofeng27692 <gaofeng27692@hundsun.com>