[cherry-pick] Fix UTF8 decoding error in GPT2BPETokenizer decode
method
#2092
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Summary:
std::string
which contains incomplete UTF8 byte sequences since the default UTF8 conversion uses"strict"
error handling (ref)"ignore"
which ignores the malformed data and continues decoding the stringDifferential Revision: D43361716
fbshipit-source-id: 4ac488e4b4b894c8049728941a2ee36b1799258a