允许 model.generate 使用bytes io, 以便不写入文件，节省io时间 (#2343)

maliubiao

2024-12-29 172a3152b42af36443ec6a0a39969471c35b893d

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[submodule "doc"]
    path = doc
    url = https://github.com/gflags/gflags.git
    branch = gh-pages