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# Psi4: an open-source quantum chemistry software package
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__all__ = [
"expand_cbs_methods",
"task_planner",
"TaskComputers",
]
import os
import copy
import logging
from typing import Dict, Tuple, Union
from qcelemental.models import DriverEnum
from psi4.driver import p4util, pp
from psi4.driver.task_base import AtomicComputer
from psi4.driver.driver_findif import FiniteDifferenceComputer
from psi4.driver.driver_nbody import ManyBodyComputer
from psi4.driver.driver_cbs import CompositeComputer, composite_procedures, cbs_text_parser
from psi4.driver.driver_util import negotiate_derivative_type, negotiate_convergence_criterion
from psi4 import core
logger = logging.getLogger(__name__)
TaskComputers = Union[AtomicComputer, CompositeComputer, FiniteDifferenceComputer, ManyBodyComputer]
[docs]def expand_cbs_methods(method: str, basis: str, driver: DriverEnum, **kwargs) -> Tuple[str, str, Dict]:
"""Sort out the user input method string into recognized fields.
Handles cases like:
(i) ``"mp2"`` -- passes through;
(ii) ``"mp2/cc-pvdz"`` -- broken into method and basis fields;
(iii) ``"mp2/cc-pv[d,t]z"`` -- processed into method="cbs" & CBSMetadata spec;
(iv) ``method="cbs", cbsmeta=CBSMetadata`` -- passes through.
Parameters
----------
method
User first argument to driver function. A string hint of the method --
see cases above.
basis
User basis hint.
driver
The calling driver function. Note for finite difference that this is
the target driver, not the means driver.
"""
if method == 'cbs' and kwargs.get('cbsmeta', False):
return method, basis, kwargs['cbsmeta']
# Expand CBS methods
if "/" in method:
kwargs["ptype"] = driver
cbsmeta = cbs_text_parser(method, **kwargs)
# Single call detected
if "cbs_metadata" not in cbsmeta:
method = cbsmeta["method"]
basis = cbsmeta["basis"]
else:
method = "cbs"
else:
cbsmeta = {}
return method, basis, cbsmeta
[docs]def task_planner(driver: DriverEnum, method: str, molecule: core.Molecule, **kwargs) -> TaskComputers:
"""Plans a task graph of a complex computation.
Canonical Task layering:
- ManyBody - BSSE treatment, many-body expansion
- FiniteDifference - derivatives through stencils
- Composite - basis set extrapolation, focal-point methods
- Atomic - analytic single-points
Parameters
----------
driver
The resulting type of computation: e/g/h. Note for finite difference
that this should be the target driver, not the means driver.
method
A string representation of the method such as "HF" or "B3LYP". Special
cases are: "cbs".
molecule
A Psi4 base molecule to use.
kwargs
User keyword arguments, often used to configure task computers.
Returns
-------
Union[AtomicComputer, CompositeComputer, FiniteDifferenceComputer, ManyBodyComputer]
A simple (:class:`~psi4.driver.AtomicComputer`) or layered (:class:`~psi4.driver.driver_cbs.CompositeComputer`, :class:`~psi4.driver.driver_findif.FiniteDifferenceComputer`, :class:`~psi4.driver.driver_nbody.ManyBodyComputer`) task object. Layered objects contain many and multiple types of computers in a graph.
"""
# Only pull the changed options
keywords = p4util.prepare_options_for_set_options()
keywords["function_kwargs"] = {}
if "external_potentials" in kwargs:
keywords["function_kwargs"].update({"external_potentials": kwargs.pop("external_potentials")})
# Need to add full path to pcm file
if "PCM__PCMSOLVER_PARSED_FNAME" in keywords.keys():
fname = keywords["PCM__PCMSOLVER_PARSED_FNAME"]
keywords["PCM__PCMSOLVER_PARSED_FNAME"] = os.path.join(os.getcwd(), fname)
# Pull basis out of kwargs, override globals if user specified
basis = kwargs.pop("basis", keywords.pop("BASIS", "(auto)"))
method = method.lower()
# Expand CBS methods
method, basis, cbsmeta = expand_cbs_methods(method, basis, driver, **kwargs)
if method in composite_procedures:
kwargs.update({'cbs_metadata': composite_procedures[method](**kwargs)})
method = 'cbs'
pertinent_findif_kwargs = ['findif_irrep', 'findif_stencil_size', 'findif_step_size', 'findif_verbose']
current_findif_kwargs = {kw: kwargs.pop(kw) for kw in pertinent_findif_kwargs if kw in kwargs}
# explicit: 'findif_mode'
# Build a packet
packet = {"molecule": molecule, "driver": driver, "method": method, "basis": basis, "keywords": keywords}
# First check for BSSE type
if kwargs.get("bsse_type", None) is not None:
levels = kwargs.pop('levels', None)
plan = ManyBodyComputer(**packet, **kwargs)
original_molecule = packet.pop("molecule")
# Add tasks for every nbody level requested
if levels is None:
levels = {plan.max_nbody: method}
else:
# rearrange bodies in order with supersystem last lest body count fail in organization loop below
levels = dict(sorted(levels.items(), key=lambda item: 1000 if item[0] == "supersystem" else item[0]))
# We define cp as being a correction to only interaction energies
# If only doing cp, we need to ignore any user-specified 1st (monomer) level
if 'cp' in kwargs.get("bsse_type", None) and 'nocp' not in kwargs.get("bsse_type", None):
if 1 in levels.keys():
removed_level = levels.pop(1)
logger.info("NOTE: User specified exclusively 'cp' correction, but provided level 1 details")
logger.info(f"NOTE: Removing level {removed_level}")
logger.info("NOTE: For total energies, add 'nocp' to bsse_list")
# Organize nbody calculations into modelchem levels
# * expand keys of `levels` into full lists of nbodies covered. save to plan, resetting max_nbody accordingly
# * below, process values of `levels`, which are modelchem strings, into kwargs specs
nbodies_per_mc_level = []
prev_body = 0
for nb in levels:
nbodies = []
if nb == "supersystem":
nbodies.append(nb)
elif nb != (prev_body + 1):
for m in range(prev_body + 1, nb + 1):
nbodies.append(m)
else:
nbodies.append(nb)
nbodies_per_mc_level.append(nbodies)
prev_body += 1
plan.max_nbody = max(nb for nb in levels if nb != "supersystem")
plan.nbodies_per_mc_level = nbodies_per_mc_level
for mc_level_idx, mtd in enumerate(levels.values()):
method, basis, cbsmeta = expand_cbs_methods(mtd, basis, driver, cbsmeta=cbsmeta, **kwargs)
packet.update({'method': method, 'basis': basis})
# Tell the task builder which level to add a task list for
# * see https://github.com/psi4/psi4/pull/1351#issuecomment-549948276 for discussion of where build_tasks logic should live
if method == "cbs":
# This CompositeComputer is discarded after being used for dermode.
simplekwargs = copy.deepcopy(kwargs)
simplekwargs.pop('dertype', None)
simplecbsmeta = copy.deepcopy(cbsmeta)
simplecbsmeta['verbose'] = 0
dummyplan = CompositeComputer(**packet, **simplecbsmeta, molecule=original_molecule, **simplekwargs)
methods = [sr.method for sr in dummyplan.task_list]
# TODO: pass more info, so fn can use for managed_methods -- ref, qc_module, fc/ae, conv/df
dermode = negotiate_derivative_type(driver, methods, kwargs.pop('dertype', None), verbose=1)
if dermode[0] == dermode[1]: # analytic
logger.info("PLANNING MB(CBS): {mc_level_idx=} {packet=} {cbsmeta=} kw={kwargs}")
plan.build_tasks(CompositeComputer, **packet, mc_level_idx=mc_level_idx, **cbsmeta, **kwargs)
else:
logger.info(
f"PLANNING MB(FD(CBS): {mc_level_idx=} {packet=} {cbsmeta=} findif_kw={current_findif_kwargs} kw={kwargs}"
)
plan.build_tasks(FiniteDifferenceComputer,
**packet,
mc_level_idx=mc_level_idx,
findif_mode=dermode,
computer=CompositeComputer,
**cbsmeta,
**current_findif_kwargs,
**kwargs)
else:
dermode = negotiate_derivative_type(driver, method, kwargs.pop('dertype', None), verbose=1)
if dermode[0] == dermode[1]: # analytic
logger.info(f"PLANNING MB: {mc_level_idx=} {packet=}")
plan.build_tasks(AtomicComputer, **packet, mc_level_idx=mc_level_idx, **kwargs)
else:
logger.info(
f"PLANNING MB(FD): {mc_level_idx=} {packet=} findif_kw={current_findif_kwargs} kw={kwargs}"
)
plan.build_tasks(FiniteDifferenceComputer,
**packet,
mc_level_idx=mc_level_idx,
findif_mode=dermode,
**current_findif_kwargs,
**kwargs)
return plan
# Check for CBS
elif method == "cbs":
kwargs.update(cbsmeta)
# This CompositeComputer is discarded after being used for dermode. Could have used directly for analytic except for excess printing with FD
simplekwargs = copy.deepcopy(kwargs)
simplekwargs['verbose'] = 0
dummyplan = CompositeComputer(**packet, **simplekwargs)
methods = [sr.method for sr in dummyplan.task_list]
# TODO: pass more info, so fn can use for managed_methods -- ref, qc_module, fc/ae, conv/df
dermode = negotiate_derivative_type(driver, methods, kwargs.pop('dertype', None), verbose=1)
if dermode[0] == dermode[1]: # analytic
logger.info('PLANNING CBS: packet={packet} kw={kwargs}')
plan = CompositeComputer(**packet, **kwargs)
return plan
else:
# For FD(CBS(Atomic)), the CompositeComputer above is discarded after being used for dermode.
logger.info(
f'PLANNING FD(CBS): dermode={dermode} packet={packet} findif_kw={current_findif_kwargs} kw={kwargs}')
plan = FiniteDifferenceComputer(**packet,
findif_mode=dermode,
computer=CompositeComputer,
**current_findif_kwargs,
**kwargs)
return plan
# Done with Wrappers -- know we want E, G, or H -- but may still be FD or AtomicComputer
else:
dermode = negotiate_derivative_type(driver, method, kwargs.pop('dertype', None), verbose=1)
convcrit = negotiate_convergence_criterion(dermode, method, return_optstash=False)
if dermode[0] == dermode[1]: # analytic
logger.info(f'PLANNING Atomic: keywords={keywords}')
return AtomicComputer(**packet, **kwargs)
else:
keywords.update(convcrit)
logger.info(
f'PLANNING FD: dermode={dermode} keywords={keywords} findif_kw={current_findif_kwargs} kw={kwargs}')
return FiniteDifferenceComputer(**packet,
findif_mode=dermode,
**current_findif_kwargs,
**kwargs)
