hidden semi markov model python from scratch

posteriormodel.add_data(data,trunc=60)

import pyhsmm
import pyhsmm.basic.distributions as distributions

obs_dim = 2
Nmax = 25

obs_hypparams = {'mu_0':np.zeros(obs_dim),
                'sigma_0':np.eye(obs_dim),
                'kappa_0':0.3,
                'nu_0':obs_dim+5}
dur_hypparams = {'alpha_0':2*30,
                 'beta_0':2}

obs_distns = [distributions.Gaussian(**obs_hypparams) for state in range(Nmax)]
dur_distns = [distributions.PoissonDuration(**dur_hypparams) for state in range(Nmax)]

posteriormodel = pyhsmm.models.WeakLimitHDPHSMM(
        alpha=6.,gamma=6., # better to sample over these; see concentration-resampling.py
        init_state_concentration=6., # pretty inconsequential
        obs_distns=obs_distns,
        dur_distns=dur_distns)