def print_pdb(atoms, cell, filedesc=sys.stdout, title="", cell_conv=1.0, atoms_conv=1.0):
"""Prints an atomic configuration into a pdb formatted file.
Also prints the cell parameters in standard pdb form. Note
that the angles are in degrees.
Args:
atoms: An atoms object giving the atom positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
title: An optional string of max. 70 characters.
"""
fmt_cryst = "CRYST1%9.3f%9.3f%9.3f%7.2f%7.2f%7.2f%s%4i\n"
fmt_atom = "ATOM %5i %4s%1s%3s %1s%4i%1s %8.3f%8.3f%8.3f%6.2f%6.2f %2s%2i\n"
if title != "":
filedesc.write("TITLE %70s\n" % (title))
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
z = 1
filedesc.write(fmt_cryst % (a, b, c, alpha, beta, gamma, " P 1 ", z))
natoms = atoms.natoms
qs = dstrip(atoms.q) * atoms_conv
lab = dstrip(atoms.names)
for i in range(natoms):
data = (i + 1, lab[i], ' ', ' 1', ' ', 1, ' ',
qs[3 * i], qs[3 * i + 1], qs[3 * i + 2], 0.0, 0.0, ' ', 0)
filedesc.write(fmt_atom % data)
filedesc.write("END\n")
def print_json(atoms, cell, filedesc=sys.stdout, title="", cell_conv=1.0, atoms_conv=1.0):
"""Prints an atomic configuration into an XYZ formatted file.
Args:
atoms: An atoms object giving the centroid positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
title: This gives a string to be appended to the comment line.
"""
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
natoms = atoms.natoms
# direct access to avoid unnecessary slow-down
qs = dstrip(atoms.q) * atoms_conv
lab = dstrip(atoms.names)
data = {}
data['natoms'] = natoms
data['cell'] = [a, b, c, alpha, beta, gamma]
data['title'] = title
data['q'] = qs.tolist()
data['labels'] = lab.tolist()
filedesc.write(json.dumps(data))
filedesc.write(" \n")
def print_xyz(atoms,
cell,
filedesc=sys.stdout,
title="",
cell_conv=1.0,
atoms_conv=1.0):
"""Prints an atomic configuration into an XYZ formatted file.
Args:
atoms: An atoms object giving the centroid positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
title: This gives a string to be appended to the comment line.
"""
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
natoms = atoms.natoms
fmt_header = "%d\n# CELL(abcABC): %10.5f %10.5f %10.5f %10.5f %10.5f %10.5f %s\n"
filedesc.write(fmt_header % (natoms, a, b, c, alpha, beta, gamma, title))
# direct access to avoid unnecessary slow-down
qs = dstrip(atoms.q) * atoms_conv
lab = dstrip(atoms.names)
for i in range(natoms):
filedesc.write("%8s %12.5e %12.5e %12.5e\n" %
(lab[i], qs[3 * i], qs[3 * i + 1], qs[3 * i + 2]))
def print_xyz_path(beads,
cell,
filedesc=sys.stdout,
cell_conv=1.0,
atoms_conv=1.0):
"""Prints all the bead configurations into a XYZ formatted file.
Prints all the replicas for each time step separately, rather than all at
once.
Args:
beads: A beads object giving the bead positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
"""
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
fmt_header = "%d\n# bead: %d CELL(abcABC): %10.5f %10.5f %10.5f %10.5f %10.5f %10.5f \n"
natoms = beads.natoms
nbeads = beads.nbeads
for j in range(nbeads):
filedesc.write(fmt_header % (natoms, j, a, b, c, alpha, beta, gamma))
for i in range(natoms):
qs = dstrip(beads.q) * atoms_conv
lab = dstrip(beads.names)
filedesc.write(
"%8s %12.5e %12.5e %12.5e\n" %
(lab[i], qs[j][3 * i], qs[j][3 * i + 1], qs[j][3 * i + 2]))
def __init__(
self,
latency=1.0e-3,
name="",
pars=None,
dopbc=False,
threaded=False,
init_file="",
plumeddat="",
plumedstep=0,
):
"""Initialises FFPlumed.
Args:
pars: Optional dictionary, giving the parameters needed by the driver.
"""
# a socket to the communication library is created or linked
if plumed is None:
raise ImportError(
"Cannot find plumed libraries to link to a FFPlumed object/")
super(FFPlumed, self).__init__(latency,
name,
pars,
dopbc=False,
threaded=threaded)
self.plumed = plumed.Plumed()
self.plumeddat = plumeddat
self.plumedstep = plumedstep
self.init_file = init_file
if self.init_file.mode == "xyz":
infile = open(self.init_file.value, "r")
myframe = read_file(self.init_file.mode, infile)
myatoms = myframe["atoms"]
mycell = myframe["cell"]
myatoms.q *= unit_to_internal("length", self.init_file.units, 1.0)
mycell.h *= unit_to_internal("length", self.init_file.units, 1.0)
self.natoms = myatoms.natoms
self.plumed.cmd("setNatoms", self.natoms)
self.plumed.cmd("setPlumedDat", self.plumeddat)
self.plumed.cmd("setTimestep", 1.0)
self.plumed.cmd(
"setMDEnergyUnits", 2625.4996
) # Pass a pointer to the conversion factor between the energy unit used in your code and kJ mol-1
self.plumed.cmd(
"setMDLengthUnits", 0.052917721
) # Pass a pointer to the conversion factor between the length unit used in your code and nm
self.plumed.cmd("setMDTimeUnits", 2.4188843e-05)
self.plumedrestart = False
if self.plumedstep > 0:
# we are restarting, signal that PLUMED should continue
self.plumedrestart = True
self.plumed.cmd("setRestart", 1)
self.plumed.cmd("init")
self.charges = dstrip(myatoms.q) * 0.0
self.masses = dstrip(myatoms.m)
self.lastq = np.zeros(3 * self.natoms)
def step(self, step=None):
""" Does one simulation time step
Attributes:
ttime: The time taken in applying the thermostat steps.
"""
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
# Store previous forces for warning exit condition
self.old_f[:] = self.forces.f
# Check for fixatoms
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
dq1 = dstrip(self.old_f)
# Move direction for steepest descent
dq1_unit = dq1 / np.sqrt(np.dot(dq1.flatten(), dq1.flatten()))
info(" @GEOP: Determined SD direction", verbosity.debug)
# Set position and direction inside the mapper
self.lm.set_dir(dstrip(self.beads.q), dq1_unit)
# Reuse initial value since we have energy and forces already
u0, du0 = (self.forces.pot.copy(),
np.dot(dstrip(self.forces.f.flatten()), dq1_unit.flatten()))
# Do one SD iteration; return positions and energy
# (x, fx,dfx) = min_brent(self.lm, fdf0=(u0, du0), x0=0.0, #DELETE
min_brent(self.lm,
fdf0=(u0, du0),
x0=0.0,
tol=self.ls_options["tolerance"] * self.tolerances["energy"],
itmax=self.ls_options["iter"],
init_step=self.ls_options["step"])
info(" Number of force calls: %d" % (self.lm.fcount))
self.lm.fcount = 0
# Update positions and forces
self.beads.q = self.lm.dbeads.q
self.forces.transfer_forces(
self.lm.dforces) # This forces the update of the forces
d_x = np.absolute(np.subtract(self.beads.q, self.lm.x0))
x = np.linalg.norm(d_x)
# Automatically adapt the search step for the next iteration.
# Relaxes better with very small step --> multiply by factor of 0.1 or 0.01
self.ls_options["step"] = 0.1 * x * self.ls_options["adaptive"] + (
1 - self.ls_options["adaptive"]) * self.ls_options["step"]
# Exit simulation step
d_x_max = np.amax(np.absolute(d_x))
self.exitstep(self.forces.pot, u0, d_x_max)
def step(self, step=None):
""" Does one simulation time step
Attributes:
ttime: The time taken in applying the thermostat steps.
"""
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
# Store previous forces for warning exit condition
self.old_f[:] = self.forces.f
# Check for fixatoms
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
dq1 = dstrip(self.old_f)
# Move direction for steepest descent
dq1_unit = dq1 / np.sqrt(np.dot(dq1.flatten(), dq1.flatten()))
info(" @GEOP: Determined SD direction", verbosity.debug)
# Set position and direction inside the mapper
self.lm.set_dir(dstrip(self.beads.q), dq1_unit)
# Reuse initial value since we have energy and forces already
u0, du0 = (self.forces.pot.copy(), np.dot(dstrip(self.forces.f.flatten()), dq1_unit.flatten()))
# Do one SD iteration; return positions and energy
# (x, fx,dfx) = min_brent(self.lm, fdf0=(u0, du0), x0=0.0, #DELETE
min_brent(self.lm, fdf0=(u0, du0), x0=0.0,
tol=self.ls_options["tolerance"] * self.tolerances["energy"],
itmax=self.ls_options["iter"], init_step=self.ls_options["step"])
info(" Number of force calls: %d" % (self.lm.fcount)); self.lm.fcount = 0
# Update positions and forces
self.beads.q = self.lm.dbeads.q
self.forces.transfer_forces(self.lm.dforces) # This forces the update of the forces
d_x = np.absolute(np.subtract(self.beads.q, self.lm.x0))
x = np.linalg.norm(d_x)
# Automatically adapt the search step for the next iteration.
# Relaxes better with very small step --> multiply by factor of 0.1 or 0.01
self.ls_options["step"] = 0.1 * x * self.ls_options["adaptive"] + (1 - self.ls_options["adaptive"]) * self.ls_options["step"]
# Exit simulation step
d_x_max = np.amax(np.absolute(d_x))
self.exitstep(self.forces.pot, u0, d_x_max)
def b2tob1(self, q):
"""Transforms a matrix from one value of beads to another.
Args:
q: A matrix with nbeads2 rows, in the bead representation.
"""
if self.noop:
# still must return a copy, as the contraction is meant to return new data, not a view
q_scal = dstrip(q).copy()
else:
# see b1tob2 for an explanation of the rationale for dealing with open path transformations
q_scal = np.tensordot(self._b2tob1, q, axes=(1, 0))
if len(self._open) > 0:
if len(q_scal.shape) == 2:
for io in self._open:
q_scal[:, 3 * io] = np.tensordot(self._o_b2tob1,
q[:, 3 * io],
axes=(1, 0))
q_scal[:, 3 * io + 1] = np.tensordot(self._o_b2tob1,
q[:, 3 * io + 1],
axes=(1, 0))
q_scal[:, 3 * io + 2] = np.tensordot(self._o_b2tob1,
q[:, 3 * io + 2],
axes=(1, 0))
else:
q_scal = np.tensordot(self._o_b2tob1, q, axes=(1, 0))
return q_scal
def step(self, step=None):
""" Does one simulation time step
Attributes:
ttime: The time taken in applying the thermostat steps.
"""
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
if step == 0:
info(" @GEOP: Initializing L-BFGS", verbosity.debug)
print self.d
self.d += dstrip(self.forces.f) / np.sqrt(np.dot(self.forces.f.flatten(), self.forces.f.flatten()))
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pot
self.old_f[:] = self.forces.f
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
# Reduce the dimensionality
masked_old_x = self.old_x[:, self.gm.fixatoms_mask]
masked_d = self.d[:, self.gm.fixatoms_mask]
# self.gm is reduced inside its __init__() and __call__() functions
masked_qlist = self.qlist[:, self.gm.fixatoms_mask]
masked_glist = self.glist[:, self.gm.fixatoms_mask]
fdf0 = (self.old_u, -self.old_f[:, self.gm.fixatoms_mask])
# We update everything within L_BFGS (and all other calls).
L_BFGS(masked_old_x, masked_d, self.gm, masked_qlist, masked_glist, fdf0,
self.big_step, self.ls_options["tolerance"] * self.tolerances["energy"],
self.ls_options["iter"], self.corrections, self.scale, step)
# Restore the dimensionality
self.d[:, self.gm.fixatoms_mask] = masked_d
self.qlist[:, self.gm.fixatoms_mask] = masked_qlist
self.glist[:, self.gm.fixatoms_mask] = masked_glist
else:
fdf0 = (self.old_u, -self.old_f)
# We update everything within L_BFGS (and all other calls).
L_BFGS(self.old_x, self.d, self.gm, self.qlist, self.glist, fdf0,
self.big_step, self.ls_options["tolerance"] * self.tolerances["energy"],
self.ls_options["iter"], self.corrections, self.scale, step)
info(" Number of force calls: %d" % (self.gm.fcount)); self.gm.fcount = 0
# Update positions and forces
self.beads.q = self.gm.dbeads.q
self.forces.transfer_forces(self.gm.dforces) # This forces the update of the forces
# Exit simulation step
d_x_max = np.amax(np.absolute(np.subtract(self.beads.q, self.old_x)))
self.exitstep(self.forces.pot, self.old_u, d_x_max)
def geop_thread(self, ieval, nstr, nevent, ostr=None):
self.geop[ieval].reset()
ipot = self.dforces[ieval].pot
for i in xrange(self.nstep):
# print "geop ", i, self.dforces[ieval].pot
self.geop[ieval].step(i)
#if self.geop[ieval].converged[0]: break
newq = dstrip(self.dbeads[ieval].q[0]).copy()
newpot = self.dforces[ieval].pot
# print "geop ", self.nstep, self.dforces[ieval].pot
with self._threadlock:
self.ecache[nstr] = newpot
self.qcache[nstr] = newq
self.ncache += 1
nevent[2] = self.ecache[nstr]
nevent[3] = self.qcache[nstr]
# launches TS calculation
#if not ostr is None:
# self.ts_thread(ieval, ostr, nstr, nevent)
#else:
# with self._threadlock:
# self.feval[ieval] = 1
with self._threadlock:
self.feval[ieval] = 1
with self._threadlock:
print "Finished ", nstr
print "Energy, initial - TS - final: ", ipot, nevent[-1], newpot
def initialize(self, step):
if step == 0:
info(" @GEOP: Initializing instanton", verbosity.low)
if self.beads.nbeads == 1:
raise ValueError("We can not perform an splitting calculation with nbeads =1")
else:
if ((self.beads.q - self.beads.q[0]) == 0).all():
# If the coordinates in all the imaginary time slices are the same
self.initial_geo()
else:
info(" @GEOP: Starting from the provided geometry in the extended phase space", verbosity.low)
# This must be done after the stretching and before the self.d.
if self.im.f is None:
self.im(self.beads.q, ret=False) # Init instanton mapper
if (self.optarrays["old_x"] == np.zeros((self.beads.nbeads, 3 * self.beads.natoms), float)).all():
self.optarrays["old_x"][:] = self.beads.q
# Specific for LBFGS
if np.linalg.norm(self.optarrays["d"]) == 0.0:
f = self.forces.f + self.im.f
self.optarrays["d"] += dstrip(f) / np.sqrt(np.dot(f.flatten(), f.flatten()))
self.update_old_pos_for()
self.init = True
def b1tob2(self, q):
"""Transforms a matrix from one value of beads to another.
Args:
q: A matrix with nbeads1 rows, in the bead representation.
"""
if self.noop:
# still must return a copy, as the contraction is meant to return new data, not a view
q_scal = dstrip(q).copy()
else:
# this applies to both bead property arrays (e.g. potentials) and bead vector properties (e.g. positions, forces)
q_scal = np.dot(self._b1tob2, q)
if len(self._open) > 0:
if len(q_scal.shape) == 2:
for io in self._open:
q_scal[:, 3 * io] = np.dot(self._o_b1tob2, q[:, 3 * io])
q_scal[:, 3 * io + 1] = np.dot(self._o_b1tob2, q[:, 3 * io + 1])
q_scal[:, 3 * io + 2] = np.dot(self._o_b1tob2, q[:, 3 * io + 2])
else:
# this applies the open path contraction to EVERYTHING because otherwise we don't know how to handle
# the fact that only some beads are open. clearly this is a hack, and in practice the point is that
# a "per bead" NM transformation of the potential is not well-defined when different beads have different
# NM transformations
q_scal = np.dot(self._o_b1tob2, q)
return q_scal
def print_pdb_path(beads,
cell,
filedesc=sys.stdout,
cell_conv=1.0,
atoms_conv=1.0):
"""Prints all the bead configurations, into a pdb formatted file.
Prints the ring polymer springs as well as the bead positions using the
CONECT command. Also prints the cell parameters in standard pdb form. Note
that the angles are in degrees.
Args:
beads: A beads object giving the bead positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
"""
fmt_cryst = "CRYST1%9.3f%9.3f%9.3f%7.2f%7.2f%7.2f%s%4i\n"
fmt_atom = "ATOM %5i %4s%1s%3s %1s%4i%1s %8.3f%8.3f%8.3f%6.2f%6.2f %2s%2i\n"
fmt_conect = "CONECT%5i%5i\n"
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
z = 1 # What even is this parameter?
filedesc.write(fmt_cryst %
(a, b, c, alpha, beta, gamma, " P 1 ", z))
natoms = beads.natoms
nbeads = beads.nbeads
for j in range(nbeads):
for i in range(natoms):
qs = dstrip(beads.q) * atoms_conv
lab = dstrip(beads.names)
data = (j * natoms + i + 1, lab[i], ' ', ' 1', ' ', 1, ' ',
qs[j][3 * i], qs[j][3 * i + 1], qs[j][3 * i + 2], 0.0, 0.0,
' ', 0)
filedesc.write(fmt_atom % data)
if nbeads > 1:
for i in range(natoms):
filedesc.write(fmt_conect % (i + 1, (nbeads - 1) * natoms + i + 1))
for j in range(nbeads - 1):
for i in range(natoms):
filedesc.write(fmt_conect % (j * natoms + i + 1,
(j + 1) * natoms + i + 1))
filedesc.write("END\n")
def __call__(self, x):
""" computes energy and gradient for optimization step
determines new position (x0+d*x)"""
self.fcount += 1
self.dbeads.q[:, self.fixatoms_mask] = self.x0[:, self.fixatoms_mask] + self.d * x
e = self.dforces.pot # Energy
g = - np.dot(dstrip(self.dforces.f[:, self.fixatoms_mask]).flatten(), self.d.flatten()) # Gradient
return e, g
def __call__(self, x):
""" computes energy and gradient for optimization step
determines new position (x0+d*x)"""
self.fcount += 1
self.dbeads.q = self.x0 + self.d * x
e = self.dforces.pot # Energy
g = - np.dot(dstrip(self.dforces.f).flatten(), self.d.flatten()) # Gradient
return e, g
def print_xyz(atoms, cell, filedesc=sys.stdout, title="", cell_conv=1.0, atoms_conv=1.0):
"""Prints an atomic configuration into an XYZ formatted file.
Args:
atoms: An atoms object giving the centroid positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
title: This gives a string to be appended to the comment line.
"""
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
natoms = atoms.natoms
fmt_header = "%d\n# CELL(abcABC): %10.5f %10.5f %10.5f %10.5f %10.5f %10.5f %s\n"
filedesc.write(fmt_header % (natoms, a, b, c, alpha, beta, gamma, title))
# direct access to avoid unnecessary slow-down
qs = dstrip(atoms.q) * atoms_conv
lab = dstrip(atoms.names)
for i in range(natoms):
filedesc.write("%8s %12.5e %12.5e %12.5e\n" % (lab[i], qs[3 * i], qs[3 * i + 1], qs[3 * i + 2]))
def __init__(self, latency=1.0e-3, name="", pars=None, dopbc=False, init_file="", plumeddat="", precision=8, plumedstep=0):
"""Initialises FFPlumed.
Args:
pars: Optional dictionary, giving the parameters needed by the driver.
"""
# a socket to the communication library is created or linked
if plumed is None:
raise ImportError("Cannot find plumed libraries to link to a FFPlumed object/")
super(FFPlumed, self).__init__(latency, name, pars, dopbc=False)
self.plumed = plumed.Plumed(precision)
self.precision = precision
self.plumeddat = plumeddat
self.plumedstep = plumedstep
self.init_file = init_file
if self.init_file.mode == "xyz":
infile = open(self.init_file.value, "r")
myframe = read_file(self.init_file.mode, infile)
myatoms = myframe['atoms']
mycell = myframe['cell']
myatoms.q *= unit_to_internal("length", self.init_file.units, 1.0)
mycell.h *= unit_to_internal("length", self.init_file.units, 1.0)
self.natoms = myatoms.natoms
self.plumed.cmd("setNatoms", self.natoms)
self.plumed.cmd("setPlumedDat", self.plumeddat)
self.plumed.cmd("setTimestep", 1.)
self.plumed.cmd("setMDEnergyUnits", 2625.4996) # Pass a pointer to the conversion factor between the energy unit used in your code and kJ mol-1
self.plumed.cmd("setMDLengthUnits", 0.052917721) # Pass a pointer to the conversion factor between the length unit used in your code and nm
self.plumed.cmd("setMDTimeUnits", 2.4188843e-05)
self.plumedrestart = False
if self.plumedstep > 0:
# we are restarting, signal that PLUMED should continue
self.plumedrestart = True
self.plumed.cmd("setRestart", 1)
self.plumed.cmd("init")
self.charges = dstrip(myatoms.q) * 0.0
self.masses = dstrip(myatoms.m)
self.lastq = np.zeros(3 * self.natoms)
def print_xyz_path(beads, cell, filedesc=sys.stdout, cell_conv=1.0, atoms_conv=1.0):
"""Prints all the bead configurations into a XYZ formatted file.
Prints all the replicas for each time step separately, rather than all at
once.
Args:
beads: A beads object giving the bead positions.
cell: A cell object giving the system box.
filedesc: An open writable file object. Defaults to standard output.
"""
a, b, c, alpha, beta, gamma = mt.h2abc_deg(cell.h * cell_conv)
fmt_header = "%d\n# bead: %d CELL(abcABC): %10.5f %10.5f %10.5f %10.5f %10.5f %10.5f \n"
natoms = beads.natoms
nbeads = beads.nbeads
for j in range(nbeads):
filedesc.write(fmt_header % (natoms, j, a, b, c, alpha, beta, gamma))
for i in range(natoms):
qs = dstrip(beads.q) * atoms_conv
lab = dstrip(beads.names)
filedesc.write("%8s %12.5e %12.5e %12.5e\n" % (lab[i], qs[j][3 * i], qs[j][3 * i + 1], qs[j][3 * i + 2]))
def step(self, step=None):
""" Does one simulation time step.
Attributes:
qtime: The time taken in updating the positions.
"""
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
if step == 0:
info(" @GEOP: Initializing BFGS", verbosity.debug)
self.d += dstrip(self.forces.f) / np.sqrt(
np.dot(self.forces.f.flatten(), self.forces.f.flatten()))
if len(self.fixatoms) > 0:
for dqb in self.d:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pot
self.old_f[:] = self.forces.f
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
fdf0 = (self.old_u, -self.old_f)
# Do one iteration of BFGS
# The invhessian and the directions are updated inside.
BFGS(self.old_x, self.d, self.gm, fdf0, self.invhessian, self.big_step,
self.ls_options["tolerance"] * self.tolerances["energy"],
self.ls_options["iter"])
info(" Number of force calls: %d" % (self.gm.fcount))
self.gm.fcount = 0
# Update positions and forces
self.beads.q = self.gm.dbeads.q
self.forces.transfer_forces(
self.gm.dforces) # This forces the update of the forces
# Exit simulation step
d_x_max = np.amax(np.absolute(np.subtract(self.beads.q, self.old_x)))
self.exitstep(self.forces.pot, self.old_u, d_x_max)
def step(self, step=None):
""" Does one simulation time step.
Attributes:
qtime: The time taken in updating the positions.
"""
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
if step == 0:
info(" @GEOP: Initializing BFGS", verbosity.debug)
self.d += dstrip(self.forces.f) / np.sqrt(np.dot(self.forces.f.flatten(), self.forces.f.flatten()))
if len(self.fixatoms) > 0:
for dqb in self.d:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pot
self.old_f[:] = self.forces.f
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
fdf0 = (self.old_u, -self.old_f)
# Do one iteration of BFGS
# The invhessian and the directions are updated inside.
BFGS(self.old_x, self.d, self.gm, fdf0, self.invhessian, self.big_step,
self.ls_options["tolerance"] * self.tolerances["energy"], self.ls_options["iter"])
info(" Number of force calls: %d" % (self.gm.fcount)); self.gm.fcount = 0
# Update positions and forces
self.beads.q = self.gm.dbeads.q
self.forces.transfer_forces(self.gm.dforces) # This forces the update of the forces
# Exit simulation step
d_x_max = np.amax(np.absolute(np.subtract(self.beads.q, self.old_x)))
self.exitstep(self.forces.pot, self.old_u, d_x_max)
def step(self, step=None):
""" Does one simulation time step
Attributes:
ttime: The time taken in applying the thermostat steps.
"""
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
if step == 0:
info(" @GEOP: Initializing L-BFGS", verbosity.debug)
self.d += dstrip(self.forces.f) / np.sqrt(np.dot(self.forces.f.flatten(), self.forces.f.flatten()))
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pot
self.old_f[:] = self.forces.f
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
fdf0 = (self.old_u, -self.old_f)
# We update everything within L_BFGS (and all other calls).
L_BFGS(self.old_x, self.d, self.gm, self.qlist, self.glist,
fdf0, self.big_step, self.ls_options["tolerance"] * self.tolerances["energy"],
self.ls_options["iter"], self.corrections, self.scale, step)
info(" Number of force calls: %d" % (self.gm.fcount)); self.gm.fcount = 0
# Update positions and forces
self.beads.q = self.gm.dbeads.q
self.forces.transfer_forces(self.gm.dforces) # This forces the update of the forces
# Exit simulation step
d_x_max = np.amax(np.absolute(np.subtract(self.beads.q, self.old_x)))
self.exitstep(self.forces.pot, self.old_u, d_x_max)
def queue(self, atoms, cell, reqid=-1):
"""Adds a request.
Note that the pars dictionary need to be sent as a string of a
standard format so that the initialisation of the driver can be done.
Args:
atoms: An Atoms object giving the atom positions.
cell: A Cell object giving the system box.
pars: An optional dictionary giving the parameters to be sent to the
driver for initialisation. Defaults to {}.
reqid: An optional integer that identifies requests of the same type,
e.g. the bead index
Returns:
A list giving the status of the request of the form {'pos': An array
giving the atom positions folded back into the unit cell,
'cell': Cell object giving the system box, 'pars': parameter string,
'result': holds the result as a list once the computation is done,
'status': a string labelling the status of the calculation,
'id': the id of the request, usually the bead number, 'start':
the starting time for the calculation, used to check for timeouts.}.
"""
par_str = " "
if not self.pars is None:
for k, v in self.pars.items():
par_str += k + " : " + str(v) + " , "
else:
par_str = " "
pbcpos = dstrip(atoms.q).copy()
# Indexes come from input in a per atom basis and we need to make a per atom-coordinate basis
# Reformat indexes for full system (default) or piece of system
# fullat=True
if self.active[0] == -1:
activehere = np.array([i for i in range(len(pbcpos))])
else:
activehere = np.array([[3 * n, 3 * n + 1, 3 * n + 2]
for n in self.active])
# fullat=False
#
# if (self.active[0]!=-1 and fullat==False):
# temp=np.array([[3*n, 3*n+1, 3*n+2] for n in self.active])
# Reassign active indexes in order to use them
activehere = activehere.flatten()
# Perform sanity check for active atoms
if (len(activehere) > len(pbcpos) or activehere[-1] >
(len(pbcpos) - 1)):
raise ValueError("There are more active atoms than atoms!")
if self.dopbc:
cell.array_pbc(pbcpos)
newreq = ForceRequest({
"id":
reqid,
"pos":
pbcpos,
"active":
activehere,
"cell": (dstrip(cell.h).copy(), dstrip(cell.ih).copy()),
"pars":
par_str,
"result":
None,
"status":
"Queued",
"start":
-1,
"t_queued":
time.time(),
"t_dispatched":
0,
"t_finished":
0
})
self._threadlock.acquire()
try:
self.requests.append(newreq)
finally:
self._threadlock.release()
return newreq
def queue(self, atoms, cell, reqid=-1, template=None):
"""Adds a request.
Note that the pars dictionary need to be sent as a string of a
standard format so that the initialisation of the driver can be done.
Args:
atoms: An Atoms object giving the atom positions.
cell: A Cell object giving the system box.
pars: An optional dictionary giving the parameters to be sent to the
driver for initialisation. Defaults to {}.
reqid: An optional integer that identifies requests of the same type,
e.g. the bead index
template: a dict giving a base model for the request item -
e.g. to add entries that are not needed for the base class execution
Returns:
A dict giving the status of the request of the form {'pos': An array
giving the atom positions folded back into the unit cell,
'cell': Cell object giving the system box, 'pars': parameter string,
'result': holds the result as a list once the computation is done,
'status': a string labelling the status of the calculation,
'id': the id of the request, usually the bead number, 'start':
the starting time for the calculation, used to check for timeouts.}.
"""
par_str = " "
if self.pars is not None:
for k, v in list(self.pars.items()):
par_str += k + " : " + str(v) + " , "
else:
par_str = " "
pbcpos = dstrip(atoms.q).copy()
# Indexes come from input in a per atom basis and we need to make a per atom-coordinate basis
# Reformat indexes for full system (default) or piece of system
# active atoms do not change but we only know how to build this array once we get the positions once
if self.iactive is None:
if self.active[0] == -1:
activehere = np.arange(len(pbcpos))
else:
activehere = np.array([[3 * n, 3 * n + 1, 3 * n + 2]
for n in self.active])
# Reassign active indexes in order to use them
activehere = activehere.flatten()
# Perform sanity check for active atoms
if len(activehere) > len(pbcpos) or activehere[-1] > (len(pbcpos) -
1):
raise ValueError("There are more active atoms than atoms!")
self.iactive = activehere
if self.dopbc:
cell.array_pbc(pbcpos)
if template is None:
template = {}
template.update({
"id": reqid,
"pos": pbcpos,
"active": self.iactive,
"cell": (dstrip(cell.h).copy(), dstrip(cell.ih).copy()),
"pars": par_str,
"result": None,
"status": "Queued",
"start": -1,
"t_queued": time.time(),
"t_dispatched": 0,
"t_finished": 0,
})
newreq = ForceRequest(template)
with self._threadlock:
self.requests.append(newreq)
if not self.threaded:
self.poll()
return newreq
def step(self, step=None):
"""Does one simulation time step
Attributes:
ptime: The time taken in updating the velocities.
qtime: The time taken in updating the positions.
ttime: The time taken in applying the thermostat steps.
"""
self.ptime = 0.0
self.ttime = 0.0
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
if step == 0:
gradf1 = dq1 = dstrip(self.forces.f)
# Move direction for 1st conjugate gradient step
dq1_unit = dq1 / np.sqrt(np.dot(gradf1.flatten(), gradf1.flatten()))
info(" @GEOP: Determined SD direction", verbosity.debug)
else:
gradf0 = self.old_f
dq0 = self.d
gradf1 = dstrip(self.forces.f)
beta = np.dot((gradf1.flatten() - gradf0.flatten()), gradf1.flatten()) / (np.dot(gradf0.flatten(), gradf0.flatten()))
dq1 = gradf1 + max(0.0, beta) * dq0
dq1_unit = dq1 / np.sqrt(np.dot(dq1.flatten(), dq1.flatten()))
info(" @GEOP: Determined CG direction", verbosity.debug)
# Store force and direction for next CG step
self.d[:] = dq1
self.old_f[:] = gradf1
if len(self.fixatoms) > 0:
for dqb in dq1_unit:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
self.lm.set_dir(dstrip(self.beads.q), dq1_unit)
# Reuse initial value since we have energy and forces already
u0, du0 = (self.forces.pot.copy(), np.dot(dstrip(self.forces.f.flatten()), dq1_unit.flatten()))
# Do one CG iteration; return positions and energy
min_brent(self.lm, fdf0=(u0, du0), x0=0.0,
tol=self.ls_options["tolerance"] * self.tolerances["energy"],
itmax=self.ls_options["iter"], init_step=self.ls_options["step"])
info(" Number of force calls: %d" % (self.lm.fcount)); self.lm.fcount = 0
# Update positions and forces
self.beads.q = self.lm.dbeads.q
self.forces.transfer_forces(self.lm.dforces) # This forces the update of the forces
d_x = np.absolute(np.subtract(self.beads.q, self.lm.x0))
x = np.linalg.norm(d_x)
# Automatically adapt the search step for the next iteration.
# Relaxes better with very small step --> multiply by factor of 0.1 or 0.01
self.ls_options["step"] = 0.1 * x * self.ls_options["adaptive"] + (1 - self.ls_options["adaptive"]) * self.ls_options["step"]
# Exit simulation step
d_x_max = np.amax(np.absolute(d_x))
self.exitstep(self.forces.pot, u0, d_x_max)
def queue(self, atoms, cell, reqid=-1):
"""Adds a request.
Note that the pars dictionary need to be sent as a string of a
standard format so that the initialisation of the driver can be done.
Args:
atoms: An Atoms object giving the atom positions.
cell: A Cell object giving the system box.
pars: An optional dictionary giving the parameters to be sent to the
driver for initialisation. Defaults to {}.
reqid: An optional integer that identifies requests of the same type,
e.g. the bead index
Returns:
A list giving the status of the request of the form {'pos': An array
giving the atom positions folded back into the unit cell,
'cell': Cell object giving the system box, 'pars': parameter string,
'result': holds the result as a list once the computation is done,
'status': a string labelling the status of the calculation,
'id': the id of the request, usually the bead number, 'start':
the starting time for the calculation, used to check for timeouts.}.
"""
par_str = " "
if not self.pars is None:
for k, v in self.pars.items():
par_str += k + " : " + str(v) + " , "
else:
par_str = " "
pbcpos = dstrip(atoms.q).copy()
# Indexes come from input in a per atom basis and we need to make a per atom-coordinate basis
# Reformat indexes for full system (default) or piece of system
# active atoms do not change but we only know how to build this array once we get the positions once
if self.iactive is None:
if self.active[0] == -1:
activehere = np.arange(len(pbcpos))
else:
activehere = np.array([[3 * n, 3 * n + 1, 3 * n + 2] for n in self.active])
# Reassign active indexes in order to use them
activehere = activehere.flatten()
# Perform sanity check for active atoms
if (len(activehere) > len(pbcpos) or activehere[-1] > (len(pbcpos) - 1)):
raise ValueError("There are more active atoms than atoms!")
self.iactive = activehere
if self.dopbc:
cell.array_pbc(pbcpos)
newreq = ForceRequest({
"id": reqid,
"pos": pbcpos,
"active": self.iactive,
"cell": (dstrip(cell.h).copy(), dstrip(cell.ih).copy()),
"pars": par_str,
"result": None,
"status": "Queued",
"start": -1,
"t_queued": time.time(),
"t_dispatched": 0,
"t_finished": 0
})
with self._threadlock:
self.requests.append(newreq)
if not self.threaded:
self.poll()
return newreq
def main(prefix, temp):
T = float(temp)
fns_pos = sorted(glob.glob(prefix + ".pos*"))
fns_for = sorted(glob.glob(prefix + ".for*"))
fn_out_kin = prefix + ".kin.xyz"
fn_out_kod = prefix + ".kod.xyz"
# check that we found the same number of positions and forces files
nbeads = len(fns_pos)
if nbeads != len(fns_for):
print fns_pos
print fns_for
raise ValueError("Mismatch between number of input files for forces and positions.")
# print some information
print 'temperature = {:f} K'.format(T)
print
print 'number of beads = {:d}'.format(nbeads)
print
print 'positions and forces file names:'
for fn_pos, fn_for in zip(fns_pos, fns_for):
print '{:s} {:s}'.format(fn_pos, fn_for)
print
print 'output file names:'
print fn_out_kin
print fn_out_kod
print
temp = unit_to_internal("energy", "kelvin", T)
# open input and output files
ipos = [open(fn, "r") for fn in fns_pos]
ifor = [open(fn, "r") for fn in fns_for]
ikin = open(fn_out_kin, "w")
ikod = open(fn_out_kod, "w")
natoms = 0
ifr = 0
while True:
# print progress
if ifr % 100 == 0:
print '\rProcessing frame {:d}'.format(ifr),
sys.stdout.flush()
# load one frame
try:
for i in range(nbeads):
ret = read_file("xyz", ipos[i])
pos = ret["atoms"]
ret = read_file("xyz", ifor[i])
force = ret["atoms"]
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms, nbeads)
forces = Beads(natoms, nbeads)
kcv = np.zeros((natoms, 6), float)
beads[i].q = pos.q
forces[i].q = force.q
except EOFError:
# finished reading files
break
# calculate kinetic energies
q = dstrip(beads.q)
f = dstrip(forces.q)
qc = dstrip(beads.qc)
kcv[:] = 0
for j in range(nbeads):
for i in range(natoms):
kcv[i, 0] += (q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 0]
kcv[i, 1] += (q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 1]
kcv[i, 2] += (q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 2]
kcv[i, 3] += (q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 1] + (q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 0]
kcv[i, 4] += (q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 2] + (q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 0]
kcv[i, 5] += (q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 2] + (q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 1]
kcv *= -0.5 / nbeads
kcv[:, 0:3] += 0.5 * Constants.kb * temp
kcv[:, 3:6] *= 0.5
# write output
ikin.write("%d\n# Centroid-virial kinetic energy estimator [a.u.] - diagonal terms: xx yy zz\n" % natoms)
ikod.write("%d\n# Centroid-virial kinetic energy estimator [a.u.] - off-diag terms: xy xz yz\n" % natoms)
for i in range(natoms):
ikin.write("%8s %12.5e %12.5e %12.5e\n" % (pos.names[i], kcv[i, 0], kcv[i, 1], kcv[i, 2]))
ikod.write("%8s %12.5e %12.5e %12.5e\n" % (pos.names[i], kcv[i, 3], kcv[i, 4], kcv[i, 5]))
ifr += 1
print '\rProcessed {:d} frames.'.format(ifr)
ikin.close()
ikod.close()
def step(self, step=None):
kT = Constants.kb * self.ensemble.temp
# computes current energy (if not already stored)
ostr = "".join(
self.state
) # this is a unique id string that charactrizes the current state
self.tscache[ostr] = {}
if not ostr in self.ecache:
self.dbeads[0].q[0, :] = self.sites[self.unique_idx(
self.state)].flatten()
rv = [0, 0, 0, 0, 0]
self.geop_thread(0, ostr, rv)
#self.beads.q[0,:] = self.dbeads[0].q[0,:] # also updates current position
# self.forces.transfer_forces(self.dforces[0]) # forces have already been computed here...
ecurr = self.ecache[ostr]
# enumerates possible reactive events (vacancy swaps)
levents = []
ethreads = [None] * self.neval
# loops over the vacancy
for ivac in xrange(self.natoms, self.natoms + self.nvac):
svac = self.idx[ivac] # lattice site associated with this vacancy
if self.state[svac] != "V":
raise IndexError(
"Something got screwed and a vacancy state is not a vacancy anymore!"
)
# loops over the neighbors of the selected vacancy
for sneigh in self.neigh[svac]:
# if the neighbor is a vacancy, move on. does not make sense to swap two vacancies!
if self.state[sneigh] == "V": continue
# creates a new state vector with swapped atoms-vacancy and the associated label string
nstate = self.state.copy()
nstate[svac], nstate[sneigh] = self.state[sneigh], self.state[
svac]
nstr = "".join(
nstate
) # this is the string that corresponds to the new state
if not nstr in self.ecache:
# new state, must compute!
# creates a swapped index
nidx = self.idx.copy()
if self.ridx[svac] != ivac or self.idx[ivac] != svac:
raise IndexError(
"Something got screwed and the index does not correspond anymore to site occupancy"
)
#ivac = self.ridx[svac]
ineigh = self.ridx[
sneigh] # gets index of atom associated with the neighboring site
nidx[ivac], nidx[ineigh] = self.idx[ineigh], self.idx[ivac]
ieval = self.find_eval(ethreads)
# launches evaluator
self.dbeads[ieval].q[0, :] = self.sites[self.unique_idx(
nstate)].flatten()
nevent = [svac, sneigh, 0.0, 0.0, 0.0]
# runs a geometry optimization
#self.geop_thread(ieval=ieval, nstr=nstr, nevent=nevent)
st = threading.Thread(target=self.geop_thread,
name=str(ieval),
kwargs={
"ieval": ieval,
"nstr": nstr,
"nevent": nevent,
"ostr": ostr
})
st.daemon = True
st.start()
ethreads[ieval] = st
else:
print "Found state ", nstr, " retrieving cached energy ", self.ecache[
nstr]
# fetch energy from previous calculation
nevent = [
svac, sneigh, self.ecache[nstr], self.qcache[nstr], 0.0
]
# EVALUATION OF TS ENERGY IS DISABLED FOR THE MOMENT...
# we might still need to compute the TS energy!
# if not nstr in self.tscache[ostr]:
# print "Computing TS"
# ieval = self.find_eval(ethreads)
# st = threading.Thread(target=self.ts_thread, name=str(ieval), kwargs={"ieval":ieval, "ostr": ostr, "nstr":nstr, "nevent" : nevent})
# st.daemon = True
# st.start()
# ethreads[ieval] = st
#else:
# print "Found TS"
# nevent[3] = self.tscache[ostr][nstr]
nevent[-1] = self.state[sneigh]
levents.append(nevent)
# wait for all evaluators to finish
for st in ethreads:
while not st is None and st.isAlive():
st.join(2)
print "Computed ", len(
levents), " possible reactions. Cache len ", len(self.ecache)
# get list of rates
rates = np.zeros(len(levents), float)
crates = np.zeros(len(levents), float)
cdf = 0.0
for i in xrange(len(levents)):
#print ("Barrier, naive: %f, static: %f" % (0.5*(ecurr + levents[i][2]) + self.diffusion_barrier_al, levents[i][4]))
ets = 0.5 * (ecurr + levents[i][2]) + self.barriers[
levents[i][-1]] #naive heuristic for the ts energy
print "Event ", i, levents[i][-1], ecurr, ">>", ets, ">>", levents[
i][2]
rates[i] = self.prefactors[levents[i][-1]] * np.exp(
-(ets - ecurr) / kT)
cdf += rates[i]
crates[i] = cdf
# KMC selection rule based on the rate
fpick = self.prng.u * cdf
isel = 0
while fpick > crates[isel]:
isel += 1
dt = -1.0 / cdf * np.log(1.0 - self.prng.u)
print("Time spent %12.5e at %s nrg %12.5e" % (dt, ostr, ecurr))
print "Selected event ", isel, " with rate ", rates[isel], " / ", cdf
iev = levents[isel] # levents[self.prng.randint(len(levents))]
svac, sneigh = iev[0], iev[1]
ivac, ineigh = self.ridx[svac], self.ridx[sneigh]
# does the swap (never reject, for the moment)
self.state[svac], self.state[sneigh] = self.state[sneigh], self.state[
svac]
self.ridx[svac], self.ridx[sneigh] = self.ridx[sneigh], self.ridx[svac]
self.idx[ivac], self.idx[ineigh] = self.idx[ineigh], self.idx[ivac]
# we got a new configuration but the residence time is linked to the previous configuration so we output that
self.kmcfile.write("%12.5e %12.5e %18.11e %s\n" %
(self.tottime, dt, ecurr, ostr))
self.kmcfile.flush()
self.tottime += dt
self.ensemble.time += dt # updates time counter
print "Finishing step at ", "".join(self.state)
# updates the positions
self.cell.h = self.dcell.h
uidx = self.unique_idx(self.state)
ruidx = np.zeros(self.nsites, int)
ruidx[uidx] = range(self.nsites)
self.sites[self.unique_idx(self.state)]
oldq = dstrip(self.beads.q[0]).copy()
newq = np.zeros(self.nsites * 3, float)
# we want continuity (modulo PBC jumps, that we'll take care of later...)
for i in xrange(self.nsites):
# in which site sits atom i?
isite = self.idx[i]
# which atom sits in this site in the unique-mapped structure?
iuid = ruidx[self.idx[i]]
newq[3 * i:3 * i + 3] = iev[3][3 * iuid:3 * (iuid + 1)]
newq -= oldq
self.cell.array_pbc(newq)
self.beads.q[0] += newq
def step(self, step=None):
""" Does one simulation time step."""
self.qtime = -time.time()
info("\n Instanton optimization STEP %d" % step, verbosity.low)
if step == 0:
info(" @GEOP: Initializing instanton", verbosity.low)
if self.beads.nbeads == 1:
raise ValueError("We can not perform an splitting calculation with nbeads =1")
# get_hessian(self.hessian, self.gm, self.beads.q)
else:
if ((self.beads.q - self.beads.q[0]) == 0).all(): # If the coordinates in all the imaginary time slices are the same
info(" @GEOP: We stretch the initial geometry with an 'amplitud' of %4.2f" % self.delta, verbosity.low)
imvector = get_imvector(self.initial_hessian, self.beads.m3[0].flatten())
for i in range(self.beads.nbeads):
self.beads.q[i, :] += self.delta * np.cos(i * np.pi / float(self.beads.nbeads - 1)) * imvector[:]
else:
info(" @GEOP: Starting from the provided geometry in the extended phase space", verbosity.low)
# Update positions and forces
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pots
self.old_f[:] = self.forces.f
# This must be done after the stretching and before the self.d.
if type(self.im.f) == type(None):
self.im(self.beads.q, ret=False) # Init instanton mapper
# Specific for LBFGS
if np.linalg.norm(self.d) == 0.0:
f = self.forces.f + self.im.f # ALBERTO1
self.d += dstrip(f) / np.sqrt(np.dot(f.flatten(), f.flatten()))
if (self.old_x == np.zeros((self.beads.nbeads, 3 * self.beads.natoms), float)).all():
self.old_x[:] = self.beads.q
if self.exit:
softexit.trigger("Geometry optimization converged. Exiting simulation")
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
e, g = self.fm(self.beads.q)
fdf0 = (e, g)
# Do one step. Update hessian for the new position. Update the position and force inside the mapper.
L_BFGS(self.old_x, self.d, self.fm, self.qlist, self.glist,
fdf0, self.big_step, self.ls_options["tolerance"] * self.tolerances["energy"],
self.ls_options["iter"], self.corrections, self.scale, step)
# ALBERTO2
# Update positions and forces
self.beads.q = self.gm.dbeads.q
self.forces.transfer_forces(self.gm.dforces) # This forces the update of the forces
# Exit simulation step
d_x_max = np.amax(np.absolute(np.subtract(self.beads.q, self.old_x)))
self.exit = self.exitstep(self.forces.pot, self.old_u.sum(), d_x_max, self.exit, step)
# Update positions and forces
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pots
self.old_f[:] = self.forces.f
# Print current instanton geometry and hessian
if (self.save > 0 and np.mod(step, self.save) == 0) or self.exit:
print_instanton_geo(self.prefix, step, self.im.dbeads.nbeads, self.im.dbeads.natoms, self.im.dbeads.names,
self.im.dbeads.q, self.old_u, self.cell, self.energy_shift, self.output_maker)
def step(self, step=None):
""" Does one simulation time step."""
self.qtime = -time.time()
info("\n Instanton optimization STEP %d" % step, verbosity.low)
if step == 0:
info(" @GEOP: Initializing INSTANTON", verbosity.low)
if self.beads.nbeads == 1:
raise ValueError(
"We can not perform an splitting calculation with nbeads =1"
)
# get_hessian(self.hessian, self.gm, self.beads.q)
else:
if ((self.beads.q - self.beads.q[0]) == 0).all(
): # If the coordinates in all the imaginary time slices are the same
info(
" @GEOP: We stretch the initial geometry with an 'amplitud' of %4.2f"
% self.delta, verbosity.low)
imvector = get_imvector(self.initial_hessian,
self.beads.m3[0].flatten())
for i in range(self.beads.nbeads):
self.beads.q[i, :] += self.delta * np.cos(
i * np.pi /
float(self.beads.nbeads - 1)) * imvector[:]
else:
info(
" @GEOP: Starting from the provided geometry in the extended phase space",
verbosity.low)
# Update positions and forces
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pots
self.old_f[:] = self.forces.f
# This must be done after the stretching and before the self.d.
if type(self.im.f) == type(None):
self.im(self.beads.q, ret=False) # Init instanton mapper
# Specific for LBFGS
if np.linalg.norm(self.d) == 0.0:
f = self.forces.f + self.im.f #ALBERTO1
self.d += dstrip(f) / np.sqrt(np.dot(f.flatten(), f.flatten()))
if (self.old_x == np.zeros((self.beads.nbeads, 3 * self.beads.natoms),
float)).all():
self.old_x[:] = self.beads.q
if self.exit:
softexit.trigger(
"Geometry optimization converged. Exiting simulation")
if len(self.fixatoms) > 0:
for dqb in self.old_f:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
e, g = self.fm(self.beads.q)
fdf0 = (e, g)
# Do one step. Update hessian for the new position. Update the position and force inside the mapper.
L_BFGS(self.old_x, self.d, self.fm, self.qlist, self.glist, fdf0,
self.big_step,
self.ls_options["tolerance"] * self.tolerances["energy"],
self.ls_options["iter"], self.corrections, self.scale, step)
# ALBERTO2
# Update positions and forces
self.beads.q = self.gm.dbeads.q
self.forces.transfer_forces(
self.gm.dforces) # This forces the update of the forces
# Exit simulation step
d_x_max = np.amax(np.absolute(np.subtract(self.beads.q, self.old_x)))
self.exit = self.exitstep(self.forces.pot, self.old_u.sum(), d_x_max,
self.exit, step)
# Update positions and forces
self.old_x[:] = self.beads.q
self.old_u[:] = self.forces.pots
self.old_f[:] = self.forces.f
# Print current instanton geometry and hessian
if (self.save > 0 and np.mod(step, self.save) == 0) or self.exit:
print_instanton_geo(self.prefix, step, self.im.dbeads.nbeads,
self.im.dbeads.natoms, self.im.dbeads.names,
self.im.dbeads.q, self.old_u, self.cell,
self.energy_shift)
def main(prefix, temp):
T = float(temp)
fns_pos = sorted(glob.glob(prefix + ".pos*"))
fns_for = sorted(glob.glob(prefix + ".for*"))
fn_out_kin = prefix + ".kin.xyz"
fn_out_kod = prefix + ".kod.xyz"
# check that we found the same number of positions and forces files
nbeads = len(fns_pos)
if nbeads != len(fns_for):
print fns_pos
print fns_for
raise ValueError(
"Mismatch between number of input files for forces and positions.")
# print some information
print 'temperature = {:f} K'.format(T)
print
print 'number of beads = {:d}'.format(nbeads)
print
print 'positions and forces file names:'
for fn_pos, fn_for in zip(fns_pos, fns_for):
print '{:s} {:s}'.format(fn_pos, fn_for)
print
print 'output file names:'
print fn_out_kin
print fn_out_kod
print
temp = unit_to_internal("energy", "kelvin", T)
# open input and output files
ipos = [open(fn, "r") for fn in fns_pos]
ifor = [open(fn, "r") for fn in fns_for]
ikin = open(fn_out_kin, "w")
ikod = open(fn_out_kod, "w")
natoms = 0
ifr = 0
while True:
# print progress
if ifr % 100 == 0:
print '\rProcessing frame {:d}'.format(ifr),
sys.stdout.flush()
# load one frame
try:
for i in range(nbeads):
ret = read_file("xyz", ipos[i])
pos = ret["atoms"]
ret = read_file("xyz", ifor[i])
force = ret["atoms"]
if natoms == 0:
natoms = pos.natoms
beads = Beads(natoms, nbeads)
forces = Beads(natoms, nbeads)
kcv = np.zeros((natoms, 6), float)
beads[i].q = pos.q
forces[i].q = force.q
except EOFError:
# finished reading files
break
# calculate kinetic energies
q = dstrip(beads.q)
f = dstrip(forces.q)
qc = dstrip(beads.qc)
kcv[:] = 0
for j in range(nbeads):
for i in range(natoms):
kcv[i,
0] += (q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 0]
kcv[i,
1] += (q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 1]
kcv[i,
2] += (q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 2]
kcv[i, 3] += (
q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 1] + (
q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 0]
kcv[i, 4] += (
q[j, i * 3 + 0] - qc[i * 3 + 0]) * f[j, i * 3 + 2] + (
q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 0]
kcv[i, 5] += (
q[j, i * 3 + 1] - qc[i * 3 + 1]) * f[j, i * 3 + 2] + (
q[j, i * 3 + 2] - qc[i * 3 + 2]) * f[j, i * 3 + 1]
kcv *= -0.5 / nbeads
kcv[:, 0:3] += 0.5 * Constants.kb * temp
kcv[:, 3:6] *= 0.5
# write output
ikin.write(
"%d\n# Centroid-virial kinetic energy estimator [a.u.] - diagonal terms: xx yy zz\n"
% natoms)
ikod.write(
"%d\n# Centroid-virial kinetic energy estimator [a.u.] - off-diag terms: xy xz yz\n"
% natoms)
for i in range(natoms):
ikin.write("%8s %12.5e %12.5e %12.5e\n" %
(pos.names[i], kcv[i, 0], kcv[i, 1], kcv[i, 2]))
ikod.write("%8s %12.5e %12.5e %12.5e\n" %
(pos.names[i], kcv[i, 3], kcv[i, 4], kcv[i, 5]))
ifr += 1
print '\rProcessed {:d} frames.'.format(ifr)
ikin.close()
ikod.close()
def step(self, step=None):
"""Does one simulation time step
Attributes:
ptime: The time taken in updating the velocities.
qtime: The time taken in updating the positions.
ttime: The time taken in applying the thermostat steps.
"""
self.ptime = 0.0
self.ttime = 0.0
self.qtime = -time.time()
info("\nMD STEP %d" % step, verbosity.debug)
if step == 0:
gradf1 = dq1 = dstrip(self.forces.f)
# Move direction for 1st conjugate gradient step
dq1_unit = dq1 / np.sqrt(np.dot(gradf1.flatten(), gradf1.flatten()))
info(" @GEOP: Determined SD direction", verbosity.debug)
else:
gradf0 = self.old_f
dq0 = self.d
gradf1 = dstrip(self.forces.f)
beta = np.dot((gradf1.flatten() - gradf0.flatten()), gradf1.flatten()) / (np.dot(gradf0.flatten(), gradf0.flatten()))
dq1 = gradf1 + max(0.0, beta) * dq0
dq1_unit = dq1 / np.sqrt(np.dot(dq1.flatten(), dq1.flatten()))
info(" @GEOP: Determined CG direction", verbosity.debug)
# Store force and direction for next CG step
self.d[:] = dq1
self.old_f[:] = gradf1
if len(self.fixatoms) > 0:
for dqb in dq1_unit:
dqb[self.fixatoms * 3] = 0.0
dqb[self.fixatoms * 3 + 1] = 0.0
dqb[self.fixatoms * 3 + 2] = 0.0
self.lm.set_dir(dstrip(self.beads.q), dq1_unit)
# Reuse initial value since we have energy and forces already
u0, du0 = (self.forces.pot.copy(), np.dot(dstrip(self.forces.f.flatten()), dq1_unit.flatten()))
# Do one CG iteration; return positions and energy
min_brent(self.lm, fdf0=(u0, du0), x0=0.0,
tol=self.ls_options["tolerance"] * self.tolerances["energy"],
itmax=self.ls_options["iter"], init_step=self.ls_options["step"])
info(" Number of force calls: %d" % (self.lm.fcount)); self.lm.fcount = 0
# Update positions and forces
self.beads.q = self.lm.dbeads.q
self.forces.transfer_forces(self.lm.dforces) # This forces the update of the forces
d_x = np.absolute(np.subtract(self.beads.q, self.lm.x0))
x = np.linalg.norm(d_x)
# Automatically adapt the search step for the next iteration.
# Relaxes better with very small step --> multiply by factor of 0.1 or 0.01
self.ls_options["step"] = 0.1 * x * self.ls_options["adaptive"] + (1 - self.ls_options["adaptive"]) * self.ls_options["step"]
# Exit simulation step
d_x_max = np.amax(np.absolute(d_x))
self.exitstep(self.forces.pot, u0, d_x_max)
