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#!/usr/bin/env python
"""
The Rosenbrock banana function
"""
from dream import *
from pylab import *
def rosen(x):
x = asarray(x)
return sum(100.0 * (x[1:] - x[:-1] ** 2) ** 2 + (1 - x[:-1]) ** 2)
n = 6
sampler = Dream(
model=LogDensity(rosen),
population=randn(2 * n, 5, n),
thinning=1,
draws=25000,
burn=10000,
# DE_snooker_rate=0,
# cycles=3,
)
state = sampler.sample()
state.mark_outliers()
state.title = "Banana function example"
# plot_corr(state); show()
plot_all(state)
show()
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