Inequality constraints with refnx
Simple equality constraints can use the mechanisms outlined in this notebook, but are better expressed using the Parameter.constraint mechanism, or by sharing Parameter objects. It is sometimes also possible to implement different parameterisation of the model to use physically relevant values.
The following processes can be used to make inequality constraints with refnx. The dataset is reflectivity from a clean silicon wafer with a native oxide layer.
[1]:
%matplotlib inline
import os.path
import numpy as np
import refnx
from refnx.dataset import ReflectDataset
from refnx.reflect import SLD, MaterialSLD, ReflectModel
from refnx.analysis import Objective, CurveFitter
np.random.seed(1)
[2]:
pth = os.path.dirname(refnx.__file__)
DATASET_NAME = 'c_PLP0000708.dat'
file_path = os.path.join(pth, 'dataset', 'test', DATASET_NAME)
data = ReflectDataset(file_path)
[3]:
air = SLD(0)
sio2 = MaterialSLD('SiO2', 2.2)
si = MaterialSLD('Si', 2.33)
s = air | sio2(15, 3) | si(0, 3)
model = ReflectModel(s, bkg=3e-8)
[4]:
# model.bkg.setp(vary=True, bounds=(0, 1e-6))
# model.scale.setp(vary=True, bounds=(0.9, 1.1))
# sio2 layer
s[1].rough.setp(vary=True, bounds=(0, 10))
s[1].thick.setp(vary=True, bounds=(0, 20))
# si/sio2 interface
s[-1].rough.setp(vary=True, bounds=(0, 10))
[5]:
objective = Objective(model, data)
fitter = CurveFitter(objective)
[6]:
fitter.fit('differential_evolution')
print(s)
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________________________________________________________________________________
Structure:
solvent: None
reverse structure: False
contract: 0
________________________________________________________________________________
Parameters: ''
<Parameter: ' - thick' , value=0 (fixed) , bounds=[-inf, inf]>
________________________________________________________________________________
Parameters: ''
<Parameter: ' - sld' , value=0 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - isld' , value=0 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - rough' , value=0 (fixed) , bounds=[-inf, inf]>
<Parameter:' - volfrac solvent', value=0 (fixed) , bounds=[0.0, 1.0]>
________________________________________________________________________________
Parameters: ''
<Parameter: ' - thick' , value=10.1026 +/- 0.411, bounds=[0.0, 20.0]>
________________________________________________________________________________
Parameters: ''
<Parameter: 'density' , value=2.2 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - rough' , value=2.66905 +/- 0.438, bounds=[0.0, 10.0]>
<Parameter:' - volfrac solvent', value=0 (fixed) , bounds=[0.0, 1.0]>
________________________________________________________________________________
Parameters: ''
<Parameter: ' - thick' , value=0 (fixed) , bounds=[-inf, inf]>
________________________________________________________________________________
Parameters: ''
<Parameter: 'density' , value=2.33 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - rough' , value=5.3773 +/- 0.96 , bounds=[0.0, 10.0]>
<Parameter:' - volfrac solvent', value=0 (fixed) , bounds=[0.0, 1.0]>
Inequality constraints with differential_evolution
Simple equality constraints can use the following mechanism, but are better expressed using the ``Parameter.constraint`` mechanism, or by sharing ``Parameter`` objects. It is sometimes also possible to implement different parameterisation of the model to use physically relevant values.
We see that the thickness of the SiO2 layer is 12.45 and the roughness of the air/SiO2 interface is 4.77. Let’s make a constraint that the roughness can’t be more than a quarter of the layer thickness. In optimisation such constraints are expressed as inequalities:
\begin{equation*} t > 4\sigma \end{equation*}
We need to rearrange so that all variables are on one side, we do the rearrangement like this so there is no divide by 0:
\begin{equation*} t - 4\sigma > 0 \end{equation*}
Now we create a callable object (has the __call__ magic method) that encodes this inequality. We’re going to create the object with the parameters we want to constrain (pars), so we can refer to them later. We’ll also store the objective because we’ll need to update it with the fitting parameters.
[7]:
class DEC(object):
def __init__(self, pars, objective):
# we'll store the parameters and objective in this object
# this will be necessary for pickling in the future
self.pars = pars
self.objective = objective
def __call__(self, x):
# we need to update the varying parameters in the
# objective first
self.objective.setp(x)
return float(self.pars[0] - 4*self.pars[1])
Now lets create an instance of that object, using the parameters we want to constrain. Following that we set up a scipy.optimize.NonlinearConstraint for use with differential_evolution. Note that we want the constraint calculation to be greater than 0.
[8]:
pars = (s[1].thick, s[1].rough)
dec = DEC(pars, objective)
from scipy.optimize import NonlinearConstraint
constraint = NonlinearConstraint(dec, 0, np.inf)
Now do the fit with the added constraint. Note that you can have more than one constraint.
[9]:
np.random.seed(1)
fitter.fit('differential_evolution', constraints=(constraint,))
print(s)
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warn('delta_grad == 0.0. Check if the approximated '
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________________________________________________________________________________
Structure:
solvent: None
reverse structure: False
contract: 0
________________________________________________________________________________
Parameters: ''
<Parameter: ' - thick' , value=0 (fixed) , bounds=[-inf, inf]>
________________________________________________________________________________
Parameters: ''
<Parameter: ' - sld' , value=0 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - isld' , value=0 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - rough' , value=0 (fixed) , bounds=[-inf, inf]>
<Parameter:' - volfrac solvent', value=0 (fixed) , bounds=[0.0, 1.0]>
________________________________________________________________________________
Parameters: ''
<Parameter: ' - thick' , value=9.93053 +/- 0.387, bounds=[0.0, 20.0]>
________________________________________________________________________________
Parameters: ''
<Parameter: 'density' , value=2.2 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - rough' , value=2.48263 +/- 0.394, bounds=[0.0, 10.0]>
<Parameter:' - volfrac solvent', value=0 (fixed) , bounds=[0.0, 1.0]>
________________________________________________________________________________
Parameters: ''
<Parameter: ' - thick' , value=0 (fixed) , bounds=[-inf, inf]>
________________________________________________________________________________
Parameters: ''
<Parameter: 'density' , value=2.33 (fixed) , bounds=[-inf, inf]>
<Parameter: ' - rough' , value=5.76589 +/- 0.889, bounds=[0.0, 10.0]>
<Parameter:' - volfrac solvent', value=0 (fixed) , bounds=[0.0, 1.0]>
Inequality constraints during MCMC sampling
If we want to implement that inequality constraint during sampling we can add an extra log-probability term to the Objective. This log-probability term will return 0 if the inequality is satisfied, but -np.inf if not.
[10]:
class LogpExtra(object):
def __init__(self, pars):
# we'll store the parameters and objective in this object
# this will be necessary for pickling in the future
self.pars = pars
def __call__(self, model, data):
if float(self.pars[0] - 4*self.pars[1]) > 0:
return 0
return -np.inf
[11]:
lpe = LogpExtra(pars)
# set the log_extra attribute of the Objective with our extra log-probability term.
objective.logp_extra = lpe
Lets check what happens to the probabilities with the specified inequality.
[12]:
print(s[1].thick)
print(s[1].rough)
print(objective.logpost())
print("Now exceed the inequality")
s[1].rough.value = 5.
print(objective.logpost())
<Parameter: ' - thick' , value=9.93053 +/- 0.387, bounds=[0.0, 20.0]>
<Parameter: ' - rough' , value=2.48263 +/- 0.394, bounds=[0.0, 10.0]>
16.92539558338339
Now exceed the inequality
-inf
Now let’s MCMC sample the system. There will be a user warning because some walkers have initial starting points which disobey the inequality. Normally one would sample for a far longer time, and thin more appropriately. However, the purpose of the following is to produce a corner plot that demonstrates the inequality - note the sharp dropoff in the probability distribution for the roughness. The roughness doesn’t like to go much higher than ~2.5, which is around a quarter of the optimal layer thickness of ~10.
[13]:
s[1].rough.value = 2.
fitter.initialise('covar')
fitter.sample(20, nthin=10, pool=1);
objective.corner();
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