"""
Simulate hard spheres and compute scattering intensity.
"""
import argparse
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from pyfeasst import fstio
from pyfeasst import scattering
# Parse arguments from command line or change their default values.
PARSER = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
PARSER.add_argument('--feasst_install', type=str, default='../../../build/',
help='FEASST install directory (e.g., the path to build)')
PARSER.add_argument('--fstprt', type=str, default='/feasst/particle/atom.fstprt',
help='FEASST particle definition')
PARSER.add_argument('--num_particles', type=int, default=128, help='number of particles')
PARSER.add_argument('--cubic_side_length', type=float, default=8,
help='cubic periodic boundary conditions')
PARSER.add_argument('--trials_per_iteration', type=int, default=int(1e5),
help='like cycles, but not necessary num_particles')
PARSER.add_argument('--equilibration_iterations', type=int, default=int(1e0),
help='number of iterations for equilibration')
PARSER.add_argument('--production_iterations', type=int, default=int(1e1),
help='number of iterations for production')
PARSER.add_argument('--hours_checkpoint', type=float, default=0.2, help='hours per checkpoint')
PARSER.add_argument('--hours_terminate', type=float, default=1., help='hours until termination')
PARSER.add_argument('--procs_per_node', type=int, default=1, help='number of processors')
PARSER.add_argument('--prefix', type=str, default='hs', help='prefix for all output file names')
PARSER.add_argument('--run_type', '-r', type=int, default=0,
help='0: run, 1: submit to queue, 2: post-process')
PARSER.add_argument('--seed', type=int, default=-1,
help='Random number generator seed. If -1, assign random seed to each sim.')
PARSER.add_argument('--max_restarts', type=int, default=10, help='Number of restarts in queue')
PARSER.add_argument('--num_nodes', type=int, default=1, help='Number of nodes in queue')
PARSER.add_argument('--scratch', type=str, default=None,
help='Optionally write scheduled job to scratch/logname/jobid.')
PARSER.add_argument('--queue_flags', type=str, default="", help='extra flags for queue (e.g., for slurm, "-p queue")')
PARSER.add_argument('--node', type=int, default=0, help='node ID')
PARSER.add_argument('--queue_id', type=int, default=-1, help='If != -1, read args from file')
PARSER.add_argument('--queue_task', type=int, default=0, help='If > 0, restart from checkpoint')
# Convert arguments into a parameter dictionary, and add argument-dependent parameters.
ARGS, UNKNOWN_ARGS = PARSER.parse_known_args()
assert len(UNKNOWN_ARGS) == 0, 'An unknown argument was included: '+str(UNKNOWN_ARGS)
PARAMS = vars(ARGS)
PARAMS['script'] = __file__
PARAMS['sim_id_file'] = PARAMS['prefix']+ '_sim_ids.txt'
PARAMS['minutes'] = int(PARAMS['hours_terminate']*60) # minutes allocated on queue
PARAMS['hours_terminate'] = 0.99*PARAMS['hours_terminate'] - 0.0333 # terminate before queue
PARAMS['procs_per_sim'] = 1
PARAMS['num_sims'] = PARAMS['num_nodes']*PARAMS['procs_per_node']
def write_feasst_script(params, file_name):
""" Write fst script for a single simulation with keys of params {} enclosed. """
with open(file_name, 'w', encoding='utf-8') as myfile:
myfile.write("""
MonteCarlo
RandomMT19937 seed {seed}
Configuration cubic_side_length {cubic_side_length} particle_type0 {fstprt}
Potential Model HardSphere VisitModel VisitModelCell min_length 1
ThermoParams beta 1 chemical_potential -1
Metropolis
TrialTranslate tunable_param 0.2 tunable_target_acceptance 0.25
Checkpoint file_name {prefix}{sim}_checkpoint.fst num_hours {hours_checkpoint} num_hours_terminate {hours_terminate}
# grand canonical ensemble initalization
TrialAdd particle_type 0
Run until_num_particles {num_particles}
RemoveTrial name TrialAdd
# canonical ensemble equilibration
Metropolis num_trials_per_iteration {trials_per_iteration} num_iterations_to_complete {equilibration_iterations}
Tune
CheckEnergy trials_per_update {trials_per_iteration} tolerance 1e-8
Log trials_per_write {trials_per_iteration} file_name {prefix}{sim}_eq.txt
Run until_criteria_complete true
RemoveModify name Tune
RemoveAnalyze name Log
# canonical ensemble production
Metropolis num_trials_per_iteration {trials_per_iteration} num_iterations_to_complete {production_iterations}
Log trials_per_write {trials_per_iteration} file_name {prefix}{sim}.txt
Movie trials_per_write {trials_per_iteration} file_name {prefix}{sim}.xyz
PairDistribution trials_per_update 1000 trials_per_write {trials_per_iteration} dr 0.025 file_name {prefix}{sim}_gr.csv
Scattering trials_per_update 100 trials_per_write {trials_per_iteration} num_frequency 10 file_name {prefix}{sim}_iq.csv
Run until_criteria_complete true
""".format(**params))
def post_process(params):
gr=pd.read_csv(params['prefix'] + '0_gr.csv', comment="#")
iq=pd.read_csv(params['prefix'] + '0_iq.csv', comment="#")
grp = iq.groupby('q', as_index=False)
assert np.abs(gr['g0-0'][45] - 1.2829) < 0.05
assert np.abs(iq['i'][3810] - 5.72894) < 0.4
assert np.abs(iq['i'][0]/iq['p0'][0]**2 - 1) < 0.075
# scale the gr closer to one at the tail by dividing by the average of the last 5%
# A fourier transform of this scaled gr will result in a smoother low-q
gr_scaled = gr['g0-0']/np.average(gr['g0-0'][int(0.95*len(gr['r'])):])
plt.plot(gr['r'], gr['g0-0'], label='gr')
plt.scatter(iq['q'], iq['i']/iq['p0']**2, label='sq_all')
plt.plot(grp.mean()['q'], grp.mean()['i']/grp.mean()['p0']**2, label='sq_av')
qs = np.arange(2*np.pi/8, 10, 0.01)
sq=list(); sqs=list()
number_density = params['num_particles']/params['cubic_side_length']**3
for q in qs:
sqs.append(scattering.structure_factor(gr['r'], gr_scaled, frequency=q, number_density=number_density))
sq.append(scattering.structure_factor(gr['r'], gr['g0-0'], frequency=q, number_density=number_density))
plt.plot(qs, sq, label='sq_from_gr')
plt.plot(qs, sqs, label='sq_from_scaled_gr')
#plt.savefig(params['prefix']+'.png', bbox_inches='tight', transparent='True')
#plt.show()
if __name__ == '__main__':
fstio.run_simulations(params=PARAMS,
sim_node_dependent_params=None,
write_feasst_script=write_feasst_script,
post_process=post_process,
queue_function=fstio.slurm_single_node,
args=ARGS)