PPM is an adaptive statistical data compression technique based on context modeling and prediction.
PPM是自适应统计数据压缩技术，基于上下文建模和预测。
The entropy coding methods which adopted fixed code table and probability model are improved to adaptive context-based alterable word length coding.
熵编码由固定的码表和概率模型改进为自适应的基于上下文的变字长编码。
The entropy coding methods which adopted fixed code table and probability model are improved to adaptive context-based alterable word length coding.
熵编码由固定的码表和概率模型改进为自适应的基于上下文的变字长编码。
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