Switch point Metropolis tuning

Questions
3

When I try to run what you created:

def logistic(L, x0, k=500, t=np.linspace(0., 1., 1000)):
    return L/(1+tt.exp(-k*(t_-x0)))

with pm.Model() as m2:
    lambda0 = pm.Normal('lambda0', mu, sd=sd)
    lambdad = pm.Normal('lambdad', 0, sd=sd, shape=nbreak-1)
    trafo = Composed(pm.distributions.transforms.LogOdds(), Ordered())
    b = pm.Beta('b', 1., 1., shape=nbreak-1, transform=trafo,
                    testval=[0.3, 0.5])
    theta_ = pm.Deterministic('theta', tt.exp(lambda0 +
                                              logistic(lambdad[0], b[0]) +
                                              logistic(lambdad[1], b[1])))
    obs = pm.Poisson('obs', theta_, observed=y)
    
    trace = pm.sample(1000, tune=1000)

I get the following error:

AttributeError: Can’t get attribute ‘Composed’ on <module ‘main’ (built-in)>

Is there any way around that?