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Overview of Changes
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===================
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* 0.6
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    * Received header is also used for classification now.
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    * The verbose mode has several levels now.
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    * Sylfilter command: an option to specify database directory was added.
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* 0.5 (2011/10/13)
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    * The calculation of combined probability of Robinson-Fisher method was
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      fixed. The version 0.4 wrongly applied the total number of words in
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      a message without excluding the words within the minimum deviation.
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      This fix will introduce more accurate filtering and a small speedup.
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    * Sylfilter command: options to specify Robinson-Fisher parameters were
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      added.
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    * The bug that a multibyte filename could not be passed on Windows was
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      fixed.
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* 0.4 (2011/10/6)
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    * Robinson-Fisher method was implemented, and it is used by default.
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      This will improve the accuracy of filtering. Previous Paul/Naive bayes
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      method still can be used with -m option.
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    * Sylfilter command: an option to specify filtering method (-m) was added.
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* 0.3 (2011/9/29)
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    * Sylfilter command: -j and -C / -c and -J option can be specified
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      at the same time
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    * Sylfilter command: -B (no-bias for clean messages) option was added.
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    * GDBM support was added (exclusive with QDBM)
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    * APIs for global configuration were added
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* 0.2 (2011/9/13)
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    * Speedup learning (data incompatible to 0.1)
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    * Support Windows
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* 0.1 (2011/9/5)
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    * Initial release
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    * Supports QDBM and SQLite
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    * Provides libsylfiter library and sylfilter command-line tool
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    * Initial implementation of bayesian filter