**Warning**: this algorithm is O*(k^n)* and therefore will not scale for
*k^n > 2^{31} - 1*

1 | ```
exactPotts(neighbors, blocks, k, beta)
``` |

`neighbors` |
A matrix of all neighbors in the lattice, one row per pixel. |

`blocks` |
A list of pixel indices, dividing the lattice into independent blocks. |

`k` |
The number of unique labels. |

`beta` |
The inverse temperature parameter of the Potts model. |

A list containing the following elements:

`expectation`

The exact mean of the sufficient statistic.

`variance`

The exact variance of the sufficient statistic.

`exp_PL`

Pseudo-likelihood (PL) approximation of the expectation of S(z).

`var_PL`

PL approx. of the variance of the sufficient statistic.

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