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add calc_mu test and pep8 format

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This commit is contained in:
Alexander Hampel 2023-03-20 14:35:17 -04:00
parent 88094c0f92
commit 45749529ec
2 changed files with 102 additions and 46 deletions
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84
python/triqs_dft_tools/sumk_dft.py
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@ -1955,22 +1955,23 @@ class SumkDFT(object):
""" """
def find_bounds(function, x_init, delta_x, max_loops=1000): def find_bounds(function, x_init, delta_x, max_loops=1000):
mpi.report("Finding bounds on chemical potential" ) mpi.report("Finding bounds on chemical potential")
x= x_init x = x_init
# First find the bounds # First find the bounds
y1 = function(x) y1 = function(x)
eps = np.sign(y1) eps = np.sign(y1)
x1= x; x1 = x
x2= x1;y2 = y1 x2 = x1
y2 = y1
nbre_loop=0 nbre_loop = 0
#abort the loop after maxiter is reached or when y1 and y2 have different sign # abort the loop after maxiter is reached or when y1 and y2 have different sign
while (nbre_loop<= max_loops) and (y2*y1)>0: while (nbre_loop <= max_loops) and (y2*y1) > 0:
nbre_loop +=1 nbre_loop += 1
x1=x2 x1 = x2
y1=y2 y1 = y2
x2 -= eps*delta_x x2 -= eps*delta_x
y2 = function(x2) y2 = function(x2)
if nbre_loop > (max_loops): if nbre_loop > (max_loops):
@ -1978,20 +1979,19 @@ class SumkDFT(object):
# Make sure that x2 > x1 # Make sure that x2 > x1
if x1 > x2: if x1 > x2:
x1,x2 = x2,x1 x1, x2 = x2, x1
y1,y2 = y2,y1 y1, y2 = y2, y1
mpi.report(f"mu_interval: [ {x1:.4f} ; {x2:.4f} ]") mpi.report(f"mu_interval: [ {x1:.4f} ; {x2:.4f} ]")
mpi.report(f"delta to target density interval: [ {y1:.4f} ; {y2:.4f} ]") mpi.report(f"delta to target density interval: [ {y1:.4f} ; {y2:.4f} ]")
return x1, x2 return x1, x2
# previous implementation # previous implementation
def F_bisection(mu): return self.total_density(mu=mu, broadening=broadening).real def F_bisection(mu): return self.total_density(mu=mu, broadening=broadening).real
density = self.density_required - self.charge_below density = self.density_required - self.charge_below
#using scipy.optimize # using scipy.optimize
def F_optimize(mu): def F_optimize(mu):
mpi.report("Trying out mu = {}".format(str(mu))) mpi.report("Trying out mu = {}".format(str(mu)))
@ -1999,47 +1999,47 @@ class SumkDFT(object):
mpi.report(f"Target density = {density}; Delta to target = {calc_dens}") mpi.report(f"Target density = {density}; Delta to target = {calc_dens}")
return calc_dens return calc_dens
#check for lowercase matching for the method variable # check for lowercase matching for the method variable
if method.lower()=="dichotomy": if method.lower() == "dichotomy":
mpi.report("\nSUMK calc_mu: Using dichtomy adjustment to find chemical potential\n") mpi.report("\nsumk calc_mu: Using dichtomy adjustment to find chemical potential\n")
self.chemical_potential = dichotomy.dichotomy(function=F_bisection, self.chemical_potential = dichotomy.dichotomy(function=F_bisection,
x_init=self.chemical_potential, y_value=density, x_init=self.chemical_potential, y_value=density,
precision_on_y=precision, delta_x=delta, max_loops=max_loops, precision_on_y=precision, delta_x=delta, max_loops=max_loops,
x_name="Chemical Potential", y_name="Total Density", x_name="Chemical Potential", y_name="Total Density",
verbosity=3)[0] verbosity=3)[0]
elif method.lower()=="newton": elif method.lower() == "newton":
mpi.report("\nSUMK calc_mu: Using Newton method to find chemical potential\n") mpi.report("\nsumk calc_mu: Using Newton method to find chemical potential\n")
self.chemical_potential = newton(func=F_optimize, self.chemical_potential = newton(func=F_optimize,
x0=self.chemical_potential, x0=self.chemical_potential,
tol=precision, maxiter=max_loops, tol=precision, maxiter=max_loops,
) )
elif method.lower()=="brent": elif method.lower() == "brent":
mpi.report("\nSUMK calc_mu: Using Brent method to find chemical potential") mpi.report("\nsumk calc_mu: Using Brent method to find chemical potential")
mpi.report("SUMK calc_mu: Finding bounds \n") mpi.report("sumk calc_mu: Finding bounds \n")
mu_guess_0, mu_guess_1 = find_bounds(function=F_optimize, mu_guess_0, mu_guess_1 = find_bounds(function=F_optimize,
x_init=self.chemical_potential, x_init=self.chemical_potential,
delta_x=delta, max_loops=max_loops, delta_x=delta, max_loops=max_loops,
) )
mu_guess_1 += 0.01 #scrambles higher lying interval to avoid getting stuck mu_guess_1 += 0.01 # scrambles higher lying interval to avoid getting stuck
mpi.report("\nSUMK calc_mu: Searching root with Brent method\n") mpi.report("\nsumk calc_mu: Searching root with Brent method\n")
self.chemical_potential = brenth(f=F_optimize, self.chemical_potential = brenth(f=F_optimize,
a=mu_guess_0, a=mu_guess_0,
b=mu_guess_1, b=mu_guess_1,
xtol=precision, maxiter=max_loops, xtol=precision, maxiter=max_loops,
) )
else: else:
raise ValueError( raise ValueError(
f"SUMK calc_mu: The selected method: {method}, is not implemented\n", f"sumk calc_mu: The selected method: {method}, is not implemented\n",
""" """
Please check for typos or select one of the following: Please check for typos or select one of the following:
* dichotomy: usual bisection algorithm from the TRIQS library * dichotomy: usual bisection algorithm from the TRIQS library
* newton: newton method, fastest convergence but more unstable * newton: newton method, fastest convergence but more unstable
* brent: finds bounds and proceeds with hyperbolic brent method, a compromise between speed and ensuring convergence * brent: finds bounds and proceeds with hyperbolic brent method, a compromise between speed and ensuring convergence
""" """
) )
return self.chemical_potential return self.chemical_potential

56
test/python/calc_mu.py Normal file
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@ -0,0 +1,56 @@
##########################################################################
#
# TRIQS: a Toolbox for Research in Interacting Quantum Systems
#
# Copyright (C) 2023 by A. Hampel
#
# TRIQS is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# TRIQS. If not, see <http://www.gnu.org/licenses/>.
#
##########################################################################
import unittest
import numpy as np
from h5 import *
from triqs.gf import MeshImFreq
from triqs_dft_tools.sumk_dft import *
class test_solver(unittest.TestCase):
def setUp(self):
self.iw_mesh = MeshImFreq(beta=40, S='Fermion', n_iw=300)
# magic reference value for the Wien2k SVO t2g example
self.ref_mu = 0.281
def test_dichotomy(self):
sumk = SumkDFT('SrVO3.ref.h5', mesh=self.iw_mesh)
mu = sumk.calc_mu(method='dichotomy', precision=0.001, delta=0.1)
self.assertTrue(abs(self.ref_mu - mu) < 0.01)
def test_brent(self):
sumk = SumkDFT('SrVO3.ref.h5', mesh=self.iw_mesh)
mu = sumk.calc_mu(method='brent', precision=0.001, delta=0.1)
self.assertTrue(abs(self.ref_mu - mu) < 0.01)
# Newton seems to be quite unstable here. Not tested right now!
# def test_newton(self):
# sumk = SumkDFT('SrVO3.ref.h5', mesh = self.iw_mesh)
# mu = sumk.calc_mu(method='newton', precision= 0.1, delta=0.01)
# self.assertTrue(abs(self.ref_mu - mu) < 0.01)
if __name__ == '__main__':
unittest.main()