# Extra parameter file¶

GADMA take an extra parameter file as input. **However one probably do not need them**. Nevertheless, if one is interested, `extra_params_template`

with all options and their descriptions can be found in `gadma/cli/`

folder.

Related options

**Options of parameter bounds**:`Min N`

- minimum value (in genetic units) of population size (0.01).`Max N`

- maximum value (in genetic units) of population size (100).`Min T`

- minimum value (in genetic units) of epoch time (0).`Max T`

- maximum value (in genetic units) of epoch time (5).`Min M`

- minimum value (in genetic units) of migration rate (0).`Max M`

- maximum value (in genetic units) of migration rate (10).

**Options of genetic algorithm**:`Size of generation`

- number of demographic models on one iteration (generation) of the genetic algorithm (10).`Fractions`

- fractions of best, mutated and crossed models that are taken to the new generation (None).`N elitism`

- number of best models that are taken to the new generation (2).`P mutation`

- fraction of models that are mutants in new generation (0.56).`P crossover`

- fraction of models that are children in new generation (0.19).`P random`

- fraction of models that were randomly generated for new generation (0.13).`Mean mutation strength`

- initial value of mean number of parameters that are mutated in the chosen model during mutation (0.63).`Const for mutation strength`

- constant for ‘one-fifth’ rule to change mutation strength (1.02).`Mean mutation rate`

- initial value of mean rate of parameter change during mutation (0.45).`Const for mutation rate`

- constant for ‘one-fifth’ rule to change mutation rate (1.07).`Stuck generation number`

- genetic algorithm stops when there is no improvement during this number of iterations.`Eps`

- change of log-likelihood that is considered significant.`Random N_A`

- enables random generation of ancestral size value and scales other parameters to this value during random generation of model parameters (True).

**Options of bayesian optimization**:`Kernel`

- name of kernel for Gaussian process (Matern52).`Acquisition function`

- name of acquisition function (EI).

**Options of global optimizations**:`X_init`

- points for initial design.`Y_init`

- value of log-likelihood on this points.