**Conditional random field - Wikipedia**
https://en.wikipedia.org/wiki/Conditional_random_field

CRFs can be extended into higher order models by making each $${\displaystyle Y_{i}}$$ dependent on a fixed number $${\displaystyle k}$$ of previous variables $${\displaystyle Y_{i-k},...,Y_{i-1}}$$. In conventional formulations of higher order CRFs, training and inference are only practical for small values of $${\displaystyle k}$$ (such as k ≤ 5), since their computational cost increases exponentially with $${\displaystyle k}$$. However, another recent advance has managed to ameliorate these issues by leveragi…

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