以XML Dom 描述响应内容正文，常用 responseBody 响应主体 ，以无符号字节（unsigned byte）数组描述响应内容正文。 返回未解码的二进制数据 responseStream 响应流 。
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每个分数需要转换成合适的无符号字节码(unsigned byte - code)。
Each score should be translated to its appropriate unsigned byte-code.
这样，单个的无符号字节将决定一个预测值，而预测 6,005,940 个测试集中的打分需要 6,005,940 个字节。
Thus, a single unsigned byte would be dedicated for a predicted value, and predicting the 6,005,940 ratings of the test set would require 6,005,940 bytes.
将字符指针和字符字节声明为无符号类型的，这样可以防止8位字符的符号扩展问题。
Declare character Pointers and character bytes as unsigned to avoid sign extension problems with 8-bit characters.
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