Data processing inequality
From Infogalactic: the planetary knowledge core
The Data processing inequality is an information theoretic concept which states that the information content of a signal cannot be increased via a local physical operation. This can be expressed concisely as 'post-processing cannot increase information'.[1] As explained by Kinney and Atwal, the DPI means that information is generally lost (never gained) when transmitted through a noisy channel.[2]
Contents
Example
Let be a Markov chain
Then,
with
if and only if
where is the Mutual information
See also
References
External links
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