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1.人工数据集写入的字符串
NA，新版本Pandas默认不再解析为标准缺失值NaN，导致NumRooms列被识别为object类型，后续均值填充失效
2.原代码
inputs.mean()为隐式筛选数值列，在部分版本中存在类型筛选逻辑差异，无法兼容na_values和select_dtypes(include=['number'])均为Pandas元老级API2处修改应通用于各版本pandas