Implements 'single counting' from Moffat [1990] (see Section III.B and Table IV), referred to as 'update exclusions' in Steinruecken et al. [2015] (footnote 2), which is now a standard method in PPM models (similar to KN methods).
Implements 'single counting' from Moffat [1990] (see Section III.B and Table
IV), referred to as 'update exclusions' in Steinruecken et al. [2015] (footnote
2), which is now a standard method in PPM models (similar to KN methods).

Moffat, Alistair (1990): "Implementing the PPM data compression scheme", IEEE Transactions on Communications, vol. 38, no. 11, pp. 1917--1921.

Steinruecken, Christian and Ghahramani, Zoubin and MacKay, David (2016): "Improving PPM with dynamic parameter updates", In Proc. Data Compression Conference (DCC-2015), pp. 193--202, April, Snowbird, UT, USA. IEEE.

PiperOrigin-RevId: 356810092

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