Create a parameter called `b_pop_sizes`.
Note
this parameter is used in a CBS model, as created by create_cbs_tree_prior
See also
the function create_param
contains a list
of all parameters that can be created
Create a parameter called `b_pop_sizes`.
this parameter is used in a CBS model, as created by create_cbs_tree_prior
the function create_param
contains a list
of all parameters that can be created