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       ids2ngram - generate n-gram data file from ids file


       ids2ngram [option]... ids_file...


       ids2ngram generates idngram file, which is a sorted [id1,..,idN,freq]
       array, from binary id stream files. Here, the id stream files are
       always generated by mmseg or slmseg. Basically, it finds all occurrence
       of n-words tuples (i.e. the tuple of (id1,..,idN)), and sorts these
       tuples by the lexicographic order of the ids make up the tuples, then
       write them to specified output file.


       The input file is presented as a binary id stream, which looks like:


       All the following options are mandatory.

       -n,--NMax N
           Generates N-gram result. ids2ngram does only support uni-gram, bi-
           gram, and trigram, so any number not in the range of 1..3 is not

       -s,--swap swap-file
           Specify the temporary intermediate file.

       -o, --out output-file
           Specify the result idngram file, e.g. the array of [id1, ..., idN,

       -p, --para N
           Specify the maximum n-gram items per paragraph. ids2ngram writes to
           the temporary file on a per-paragraph basis. Every time it writes a
           paragraph out, it frees the corresponding memory allocated for it.
           When your computer system permits, a higher N is suggested. This
           can speed up the processing speed because of less I/O.


       Following example will use three input idstream file idsfile[1,2,3] to
       generate the idngram file all.id3gram. Each para (internal map size or
       hash size) would be 1024000, using swap file for temp result. All temp
       para result would eventually be merged to got the final result.

       ids2ngram -n 3 -s /tmp/swap -o all.id3gram -p 1024000 idsfile1 idsfile2


       Originally written by Phill.Zhang <>.  Currently
       maintained by Kov.Chai <>.


       mmseg(1), slmseg(1), slmbuild (1).