def start(self, job, verbose=False):
if self.mpi_id == 0:
from pytom.basic.structures import ParticleList, Reference
from pytom.basic.resolution import bandToAngstrom
from pytom.basic.filter import lowpassFilter
from math import ceil
# randomly split the particle list into 2 half sets
if len(job.particleList.splitByClass()) != 2:
import numpy as np
n = len(job.particleList)
labels = np.random.randint(2, size=(n, ))
print(self.node_name + ': Number of 1st half set:',
n - np.sum(labels), 'Number of 2nd half set:',
np.sum(labels))
for i in range(n):
p = job.particleList[i]
p.setClass(labels[i])
self.destination = job.destination
new_reference = job.reference
old_freq = job.freq
new_freq = job.freq
# main node
for i in range(job.max_iter):
if verbose:
print(self.node_name + ': starting iteration %d ...' % i)
# construct a new job by updating the reference and the frequency
new_job = FRMJob(job.particleList, new_reference, job.mask,
job.peak_offset, job.sampleInformation,
job.bw_range, new_freq, job.destination,
job.max_iter - i, job.r_score, job.weighting)
# distribute it
self.distribute_job(new_job, verbose)
# get the result back
all_even_pre = None # the 1st set
all_even_wedge = None
all_odd_pre = None # the 2nd set
all_odd_wedge = None
pl = ParticleList()
for j in range(self.num_workers):
result = self.get_result()
pl += result.pl
pre, wedge = self.retrieve_res_vols(result.name)
if self.assignment[result.worker_id] == 0:
if all_even_pre:
all_even_pre += pre
all_even_wedge += wedge
else:
all_even_pre = pre
all_even_wedge = wedge
else:
if all_odd_pre:
all_odd_pre += pre
all_odd_wedge += wedge
else:
all_odd_pre = pre
all_odd_wedge = wedge
# write the new particle list to the disk
pl.toXMLFile('aligned_pl_iter' + str(i) + '.xml')
# create the averages separately
if verbose:
print(self.node_name + ': determining the resolution ...')
even = self.create_average(all_even_pre, all_even_wedge)
odd = self.create_average(all_odd_pre, all_odd_wedge)
# apply symmetries if any
even = job.symmetries.applyToParticle(even)
odd = job.symmetries.applyToParticle(odd)
# determine the transformation between even and odd
# here we assume the wedge from both sets are fully sampled
from sh_alignment.frm import frm_align
pos, angle, score = frm_align(odd, None, even, None,
job.bw_range, new_freq,
job.peak_offset)
print(self.node_name +
'Transform of even set to match the odd set - shift: ' +
str(pos) + ' rotation: ' + str(angle))
# transform the odd set accordingly
from pytom_volume import vol, transformSpline
from pytom.basic.fourier import ftshift
from pytom_volume import reducedToFull
from pytom_freqweight import weight
transformed_odd_pre = vol(odd.sizeX(), odd.sizeY(),
odd.sizeZ())
full_all_odd_wedge = reducedToFull(all_odd_wedge)
ftshift(full_all_odd_wedge)
odd_weight = weight(
full_all_odd_wedge) # the funny part of pytom
transformed_odd = vol(odd.sizeX(), odd.sizeY(), odd.sizeZ())
transformSpline(all_odd_pre, transformed_odd_pre, -angle[1],
-angle[0], -angle[2],
odd.sizeX() / 2,
odd.sizeY() / 2,
odd.sizeZ() / 2, -(pos[0] - odd.sizeX() / 2),
-(pos[1] - odd.sizeY() / 2),
-(pos[2] - odd.sizeZ() / 2), 0, 0, 0)
odd_weight.rotate(-angle[1], -angle[0], -angle[2])
transformed_odd_wedge = odd_weight.getWeightVolume(True)
transformSpline(odd, transformed_odd, -angle[1], -angle[0],
-angle[2],
odd.sizeX() / 2,
odd.sizeY() / 2,
odd.sizeZ() / 2, -(pos[0] - odd.sizeX() / 2),
-(pos[1] - odd.sizeY() / 2),
-(pos[2] - odd.sizeZ() / 2), 0, 0, 0)
all_odd_pre = transformed_odd_pre
all_odd_wedge = transformed_odd_wedge
odd = transformed_odd
# determine resolution
resNyquist, resolutionBand, numberBands = self.determine_resolution(
even, odd, job.fsc_criterion, None, job.mask, verbose)
# write the half set to the disk
even.write(
os.path.join(self.destination,
'fsc_' + str(i) + '_even.em'))
odd.write(
os.path.join(self.destination,
'fsc_' + str(i) + '_odd.em'))
current_resolution = bandToAngstrom(
resolutionBand, job.sampleInformation.getPixelSize(),
numberBands, 1)
if verbose:
print(
self.node_name + ': current resolution ' +
str(current_resolution), resNyquist)
# create new average
all_even_pre += all_odd_pre
all_even_wedge += all_odd_wedge
average = self.create_average(all_even_pre, all_even_wedge)
# apply symmetries
average = job.symmetries.applyToParticle(average)
# filter average to resolution
average_name = os.path.join(self.destination,
'average_iter' + str(i) + '.em')
average.write(average_name)
# update the references
new_reference = [
Reference(
os.path.join(self.destination,
'fsc_' + str(i) + '_even.em')),
Reference(
os.path.join(self.destination,
'fsc_' + str(i) + '_odd.em'))
]
# low pass filter the reference and write it to the disk
filtered = lowpassFilter(average, ceil(resolutionBand),
ceil(resolutionBand) / 10)
filtered_ref_name = os.path.join(
self.destination, 'average_iter' + str(i) + '_res' +
str(current_resolution) + '.em')
filtered[0].write(filtered_ref_name)
# if the position/orientation is not improved, break it
# change the frequency to a higher value
new_freq = int(ceil(resolutionBand)) + 1
if new_freq <= old_freq:
if job.adaptive_res is not False: # two different strategies
print(
self.node_name +
': Determined resolution gets worse. Include additional %f percent frequency to be aligned!'
% job.adaptive_res)
new_freq = int((1 + job.adaptive_res) * old_freq)
else: # always increase by 1
print(
self.node_name +
': Determined resolution gets worse. Increase the frequency to be aligned by 1!'
)
new_freq = old_freq + 1
old_freq = new_freq
else:
old_freq = new_freq
if new_freq >= numberBands:
print(self.node_name +
': New frequency too high. Terminate!')
break
if verbose:
print(self.node_name + ': change the frequency to ' +
str(new_freq))
# send end signal to other nodes and terminate itself
self.end(verbose)
else:
# other nodes
self.run(verbose)
def start(self, job, verbose=False):
"""
start FRM job
@param job: FRM job
@type job: L{FRMJob}
@param verbose: print stuff (default: False)
@type verbose: C{bool}
"""
if self.mpi_id == 0:
from pytom.basic.structures import ParticleList, Reference
from pytom.basic.resolution import bandToAngstrom
from pytom.basic.filter import lowpassFilter
from math import ceil
self.destination = job.destination
new_reference = job.reference
old_freq = job.freq
new_freq = job.freq
#print(f"reference = {job.reference}")
#print(f"particlelist = {job.particleList}")
print(f"iterations = {job.max_iter:d}")
print(f"binning = {job.binning:d}")
#print(f"mask = {job.mask}")
#print(f"peak_offset= {job.peak_offset:f2.1}")
print(f"destination= {job.destination:s}")
print(f"freq cut = {job.freq:d}")
# main node
for i in range(job.max_iter):
if verbose:
print(self.node_name + ': starting iteration %d ...' % i)
# construct a new job by updating the reference and the frequency
new_job = FRMJob(job.particleList,
new_reference,
job.mask,
job.peak_offset,
job.sampleInformation,
job.bw_range,
new_freq,
job.destination,
job.max_iter - i,
job.r_score,
job.weighting,
constraint=job.constraint,
binning=job.binning)
# distribute it
self.distribute_job(new_job, verbose)
# get the result back
all_even_pre = None
all_even_wedge = None
all_odd_pre = None
all_odd_wedge = None
pl = ParticleList()
for j in range(self.num_workers):
result = self.get_result()
pl += result.pl
even_pre, even_wedge, odd_pre, odd_wedge = self.retrieve_res_vols(
result.name)
if all_even_pre:
all_even_pre += even_pre
all_even_wedge += even_wedge
all_odd_pre += odd_pre
all_odd_wedge += odd_wedge
else:
all_even_pre = even_pre
all_even_wedge = even_wedge
all_odd_pre = odd_pre
all_odd_wedge = odd_wedge
# write the new particle list to the disk
pl.toXMLFile(
os.path.join(job.destination,
'aligned_pl_iter' + str(i) + '.xml'))
# create half sets
even = self.create_average(all_even_pre, all_even_wedge)
odd = self.create_average(all_odd_pre, all_odd_wedge)
# apply symmetries before determine resolution
even = job.symmetries.applyToParticle(even)
odd = job.symmetries.applyToParticle(odd)
resNyquist, resolutionBand, numberBands = self.determine_resolution(
even, odd, job.fsc_criterion, None, job.mask, verbose)
# write the half set to the disk
even.write(
os.path.join(self.destination,
'fsc_' + str(i) + '_even.em'))
odd.write(
os.path.join(self.destination,
'fsc_' + str(i) + '_odd.em'))
# determine the resolution
if verbose:
print(self.node_name + ': determining the resolution ...')
current_resolution = bandToAngstrom(
resolutionBand, job.sampleInformation.getPixelSize(),
numberBands, 1)
if verbose:
print(
self.node_name + ': current resolution ' +
str(current_resolution), resNyquist)
# create new average
all_even_pre += all_odd_pre
all_even_wedge += all_odd_wedge
average = self.create_average(all_even_pre, all_even_wedge)
# apply symmetries
average = job.symmetries.applyToParticle(average)
# filter average to resolution and update the new reference
average_name = os.path.join(self.destination,
'average_iter' + str(i) + '.em')
# pl.average(average_name, True)
average.write(average_name)
new_reference = Reference(average_name)
# low pass filter the reference and write it to the disk
filtered = lowpassFilter(average, ceil(resolutionBand),
ceil(resolutionBand) / 10)
filtered_ref_name = os.path.join(
self.destination, 'average_iter' + str(i) + '_res' +
str(current_resolution) + '.em')
filtered[0].write(filtered_ref_name)
# if the position/orientation is not improved, break it
# change the frequency to a higher value
new_freq = int(ceil(resolutionBand)) + 1
if new_freq <= old_freq:
if job.adaptive_res is not False: # two different strategies
print(
self.node_name +
': Determined resolution gets worse. Include additional %f percent frequency to be aligned!'
% job.adaptive_res)
new_freq = int((1 + job.adaptive_res) * new_freq)
old_freq = new_freq
else: # always increase by 1
print(
self.node_name +
': Determined resolution gets worse. Increase the frequency to be aligned by 1!'
)
new_freq = old_freq + 1
old_freq = new_freq
else:
old_freq = new_freq
if new_freq >= numberBands:
print(self.node_name +
': New frequency too high. Terminate!')
break
if verbose:
print(self.node_name + ': change the frequency to ' +
str(new_freq))
# send end signal to other nodes and terminate itself
self.end(verbose)
else:
# other nodes
self.run(verbose)
if v1Filename and v2Filename:
print('Resolution determined for ', v1Filename, ' and ',
v2Filename)
elif particleList:
print('Resolution determined for ', particleList, ' ')
print('')
print('FSC Criterion: ', fscCriterion)
print('Number of Bands: ', numberBands)
print('')
print('Nyquist: ', r[0])
print('Band: ', r[1])
if pixelSize:
from pytom.basic.resolution import bandToAngstrom
resolution = bandToAngstrom(r[1], pixelSize, numberBands)
print('Resolution determined for pixelsize : ', pixelSize, ' at ',
resolution, ' Angstrom')
else:
print('XML')
if plot and v1Filename and v2Filename:
import matplotlib
import numpy
matplotlib.use('Qt5Agg')
from pylab import subplots, savefig, show
fig, ax = subplots(1, 1, figsize=(10, 5))
ax.plot(f, label='FSC orig')
def multiRef_EXMXAlign(multiRefJob, doFinalize=True, verbose=False):
"""
multiRef_EXMXAlign: Performs multi reference alignment on a particle list
@param multiRefJob: The multi reference alignment job
@param doFinalize: Send finalize msgs to workers or not. Default is true
@param verbose: Default is false
"""
import pytom_mpi
if doFinalize:
pytom_mpi.init()
if pytom_mpi.rank() == 0:
from pytom.alignment.ExMaxAlignment import ExMaxManager
from pytom.tools.files import checkDirExists
from os import mkdir
from pytom.basic.resolution import bandToAngstrom, angstromToBand, angleFromResolution
particleList = multiRefJob.getParticleList()
initialParticleList = particleList
previousParticleList = initialParticleList
destinationDirectory = multiRefJob.getDestinationDirectory()
numberIterations = multiRefJob.getNumberIterations()
numberClasses = multiRefJob.getNumberClasses()
exMaxJob = multiRefJob.getExMaxJob()
p = particleList[0]
pVol = p.getVolume()
cubeSize = pVol.sizeX()
preprocessing = exMaxJob.getPreprocessing()
sampleInfo = exMaxJob.getSampleInformation()
if verbose:
print(multiRefJob)
if not checkDirExists(destinationDirectory):
raise IOError('Destination directory ' + destinationDirectory +
' not found!')
try:
particleLists = particleList.splitByClass()
if len(particleLists) <= 1:
raise Exception()
except Exception:
from pytom.cluster.clusterFunctions import randomiseParticleListClasses
if numberClasses:
if verbose:
print('Randomizing particle list')
particleList = randomiseParticleListClasses(
particleList, numberClasses)
particleList.toXMLFile(destinationDirectory +
'/RandomisedParticleList.xml')
particleLists = particleList.splitByClass()
else:
raise RuntimeError(
'The particle list provided is not pre-classified and you did not set numberClasses for a random seed!'
)
iteration = 0
converged = False
while iteration < numberIterations and (not converged):
if verbose:
print('Running iteration ' + str(iteration) + ' of ' +
str(numberIterations))
iterationDirectory = destinationDirectory + '/' + str(
iteration) + '/'
if not checkDirExists(iterationDirectory):
mkdir(iterationDirectory)
#determine resolution of all classes
maxRes = 0
minRes = 1000000
if not checkDirExists(iterationDirectory + 'resolution/'):
mkdir(iterationDirectory + 'resolution/')
for classIterator in range(len(particleLists)):
currentParticleList = particleLists[classIterator]
if len(currentParticleList) > 1:
[resNyquist, resolutionBand,
numberBands] = currentParticleList.determineResolution(
criterion=exMaxJob.getFSCCriterion(),
numberBands=cubeSize / 2,
mask=exMaxJob.getMask(),
keepHalfsetAverages=False,
halfsetPrefix=iterationDirectory + 'resolution/' +
'class' + str(classIterator) + '_fsc-',
verbose=verbose)
else:
continue
resolutionAngstrom = bandToAngstrom(resolutionBand,
sampleInfo.getPixelSize(),
numberBands, 1)
#resolutionAngstrom = bandToAngstrom(resolutionBand,sampleInfo.getPixelSize(),numberBands,exMaxJob.getBinning() )
if resolutionBand > maxRes:
maxRes = resolutionBand
if resolutionBand < minRes:
minRes = resolutionBand
if verbose:
print(
'Class ', classIterator, ' - current resolution :' +
str(resolutionAngstrom) + ' Angstrom')
#set highest frequency according to user specification
band = maxRes
if not multiRefJob.getUseMaxResolution():
band = minRes
if band == numberBands:
#determineResolution returns numberBands for filter if fsc result is invalid. in that case, use nyquist /2 as filter setting
print('Warning MultiRefAlignment.py: LL 114')
print(
'Warning: Resolution determined for all classes was invalid. Will use Nyquist/2 for current iteration'
)
band = numberBands / 2
preprocessing.setHighestFrequency(band)
exMaxJob.setPreprocessing(preprocessing)
alignmentLists = [None] * len(particleLists)
#generate cluster centers
referenceList = distributeExpectation(
particleLists, iterationDirectory,
'clusterCenter' + str(iteration), verbose,
exMaxJob.getSymmetry())
for classIterator in range(len(particleLists)):
classDirectory = iterationDirectory + 'class' + str(
classIterator) + '/'
#determine distance for all particles
refinementDirectory = classDirectory + 'refinement/'
if verbose:
print(refinementDirectory)
if not checkDirExists(refinementDirectory):
mkdir(refinementDirectory)
exMaxJob.setParticleList(particleList)
exMaxJob.setReference(referenceList[classIterator])
exMaxJob.setDestination(refinementDirectory)
#run refinement
manager = ExMaxManager(exMaxJob)
manager.distributeAlignment(verbose)
alignmentLists[classIterator] = manager.getAlignmentList()
alignmentLists[classIterator].toXMLFile(iterationDirectory +
'AlignmentList' +
str(classIterator) +
'.xml')
#perform classification here
if verbose:
print('Classifying after iteration ' + str(iteration))
particleList = classifyParticleList(initialParticleList,
alignmentLists, verbose)
particleList.toXMLFile(iterationDirectory +
'classifiedParticles.xml')
particleLists = particleList.splitByClass()
difference = previousParticleList.classDifference(particleList)
converged = multiRefJob.getEndThreshold() >= difference[3]
#set up for next round!
previousParticleList = particleList
iteration = iteration + 1
if doFinalize:
manager.parallelEnd()
pytom_mpi.finalise()
return [particleList, alignmentLists]
else:
from pytom.alignment.ExMaxAlignment import ExMaxWorker
worker = ExMaxWorker()
worker.parallelRun()
pytom_mpi.finalise()
def start(self, job, verbose=False):
if self.mpi_id == 0:
from pytom.basic.structures import ParticleList, Reference
from pytom.basic.resolution import bandToAngstrom
from pytom.basic.filter import lowpassFilter
from math import ceil
from pytom.basic.fourier import convolute
from pytom_volume import vol, power, read
# randomly split the particle list into 2 half sets
import numpy as np
num_pairs = len(job.particleList.pairs)
for i in range(num_pairs):
# randomize the class labels to indicate the two half sets
pl = job.particleList.pairs[i].get_phase_flip_pl()
n = len(pl)
labels = np.random.randint(2, size=(n, ))
print(self.node_name + ': Number of 1st half set:',
n - np.sum(labels), 'Number of 2nd half set:',
np.sum(labels))
for j in range(n):
p = pl[j]
p.setClass(labels[j])
new_reference = job.reference
old_freq = job.freq
new_freq = job.freq
# main node
for i in range(job.max_iter):
if verbose:
print(self.node_name + ': starting iteration %d ...' % i)
# construct a new job by updating the reference and the frequency
# here the job.particleList is actually ParticleListSet
new_job = MultiDefocusJob(job.particleList, new_reference,
job.mask, job.peak_offset,
job.sampleInformation, job.bw_range,
new_freq, job.destination,
job.max_iter - i, job.r_score,
job.weighting, job.bfactor)
# distribute it
num_all_particles = self.distribute_job(new_job, verbose)
# calculate the denominator
sum_ctf_squared = None
for pair in job.particleList.pairs:
if sum_ctf_squared is None:
sum_ctf_squared = pair.get_ctf_sqr_vol() * pair.snr
else:
sum_ctf_squared += pair.get_ctf_sqr_vol() * pair.snr
# get the result back
all_even_pre = None
all_even_wedge = None
all_odd_pre = None
all_odd_wedge = None
pls = []
for j in range(len(job.particleList.pairs)):
pls.append(ParticleList())
for j in range(self.num_workers):
result = self.get_result()
pair_id = self.assignment[result.worker_id]
pair = job.particleList.pairs[pair_id]
pl = pls[pair_id]
pl += result.pl
even_pre, even_wedge, odd_pre, odd_wedge = self.retrieve_res_vols(
result.name)
if all_even_pre:
all_even_pre += even_pre * pair.snr
all_even_wedge += even_wedge
all_odd_pre += odd_pre * pair.snr
all_odd_wedge += odd_wedge
else:
all_even_pre = even_pre * pair.snr
all_even_wedge = even_wedge
all_odd_pre = odd_pre * pair.snr
all_odd_wedge = odd_wedge
# write the new particle list to the disk
for j in range(len(job.particleList.pairs)):
pls[j].toXMLFile('aligned_pl' + str(j) + '_iter' + str(i) +
'.xml')
# correct for the number of particles in wiener filter
sum_ctf_squared = sum_ctf_squared / num_all_particles
# all_even_pre = all_even_pre/(num_all_particles/2)
# all_odd_pre = all_odd_pre/(num_all_particles/2)
# bfactor
if job.bfactor and job.bfactor != 'None':
# bfactor_kernel = create_bfactor_vol(sum_ctf_squared.sizeX(), job.sampleInformation.getPixelSize(), job.bfactor)
bfactor_kernel = read(job.bfactor)
bfactor_kernel_sqr = vol(bfactor_kernel)
power(bfactor_kernel_sqr, 2)
all_even_pre = convolute(all_even_pre, bfactor_kernel,
True)
all_odd_pre = convolute(all_odd_pre, bfactor_kernel, True)
sum_ctf_squared = sum_ctf_squared * bfactor_kernel_sqr
# create averages of two sets
if verbose:
print(self.node_name + ': determining the resolution ...')
even = self.create_average(
all_even_pre, sum_ctf_squared, all_even_wedge
) # assume that the CTF sum is the same for the even and odd
odd = self.create_average(all_odd_pre, sum_ctf_squared,
all_odd_wedge)
# determine the transformation between even and odd
# here we assume the wedge from both sets are fully sampled
from sh_alignment.frm import frm_align
pos, angle, score = frm_align(odd, None, even, None,
job.bw_range, new_freq,
job.peak_offset)
print(
self.node_name +
': transform of even set to match the odd set - shift: ' +
str(pos) + ' rotation: ' + str(angle))
# transform the odd set accordingly
from pytom_volume import vol, transformSpline
from pytom.basic.fourier import ftshift
from pytom_volume import reducedToFull
from pytom_freqweight import weight
transformed_odd_pre = vol(odd.sizeX(), odd.sizeY(),
odd.sizeZ())
full_all_odd_wedge = reducedToFull(all_odd_wedge)
ftshift(full_all_odd_wedge)
odd_weight = weight(
full_all_odd_wedge) # the funny part of pytom
transformed_odd = vol(odd.sizeX(), odd.sizeY(), odd.sizeZ())
transformSpline(all_odd_pre, transformed_odd_pre, -angle[1],
-angle[0], -angle[2], int(odd.sizeX() / 2),
int(odd.sizeY() / 2), int(odd.sizeZ() / 2),
-(pos[0] - odd.sizeX() / 2),
-(pos[1] - odd.sizeY() / 2),
-(pos[2] - odd.sizeZ() / 2), 0, 0, 0)
odd_weight.rotate(-angle[1], -angle[0], -angle[2])
transformed_odd_wedge = odd_weight.getWeightVolume(True)
transformSpline(odd, transformed_odd, -angle[1], -angle[0],
-angle[2], int(odd.sizeX() / 2),
int(odd.sizeY() / 2), int(odd.sizeZ() / 2),
-(pos[0] - odd.sizeX() / 2),
-(pos[1] - odd.sizeY() / 2),
-(pos[2] - odd.sizeZ() / 2), 0, 0, 0)
all_odd_pre = transformed_odd_pre
all_odd_wedge = transformed_odd_wedge
odd = transformed_odd
# apply symmetries before determine resolution
# with gold standard you should be careful about applying the symmetry!
even = job.symmetries.applyToParticle(even)
odd = job.symmetries.applyToParticle(odd)
resNyquist, resolutionBand, numberBands = self.determine_resolution(
even, odd, job.fsc_criterion, None, job.mask, verbose)
# write the half set to the disk
even.write('fsc_' + str(i) + '_even.em')
odd.write('fsc_' + str(i) + '_odd.em')
current_resolution = bandToAngstrom(
resolutionBand, job.sampleInformation.getPixelSize(),
numberBands, 1)
if verbose:
print(
self.node_name + ': current resolution ' +
str(current_resolution), resNyquist)
# create new average
all_even_pre += all_odd_pre
all_even_wedge += all_odd_wedge
# all_even_pre = all_even_pre/2 # correct for the number of particles in wiener filter
average = self.create_average(all_even_pre, sum_ctf_squared,
all_even_wedge)
# apply symmetries
average = job.symmetries.applyToParticle(average)
# filter average to resolution and update the new reference
average_name = 'average_iter' + str(i) + '.em'
average.write(average_name)
# update the references
new_reference = [
Reference('fsc_' + str(i) + '_even.em'),
Reference('fsc_' + str(i) + '_odd.em')
]
# low pass filter the reference and write it to the disk
filtered = lowpassFilter(average, ceil(resolutionBand),
ceil(resolutionBand) / 10)
filtered_ref_name = 'average_iter' + str(i) + '_res' + str(
current_resolution) + '.em'
filtered[0].write(filtered_ref_name)
# change the frequency to a higher value
new_freq = int(ceil(resolutionBand)) + 1
if new_freq <= old_freq:
if job.adaptive_res is not False: # two different strategies
print(
self.node_name +
': Determined resolution gets worse. Include additional %f percent frequency to be aligned!'
% job.adaptive_res)
new_freq = int((1 + job.adaptive_res) * old_freq)
else: # always increase by 1
print(
self.node_name +
': Determined resolution gets worse. Increase the frequency to be aligned by 1!'
)
new_freq = old_freq + 1
old_freq = new_freq
else:
old_freq = new_freq
if new_freq >= numberBands:
print(self.node_name +
': Determined frequency too high. Terminate!')
break
if verbose:
print(self.node_name + ': change the frequency to ' +
str(new_freq))
# send end signal to other nodes and terminate itself
self.end(verbose)
else:
# other nodes
self.run(verbose)
def start(self, job, verbose=False):
if self.mpi_id == 0:
from pytom.basic.structures import ParticleList, Reference
from pytom.basic.resolution import bandToAngstrom
from pytom.basic.filter import lowpassFilter
from math import ceil
from pytom.basic.fourier import convolute
from pytom_volume import vol, power, read
new_reference = job.reference
old_freq = job.freq
new_freq = job.freq
# main node
for i in range(job.max_iter):
if verbose:
print(self.node_name + ': starting iteration %d ...' % i)
# construct a new job by updating the reference and the frequency
# here the job.particleList is actually ParticleListSet
new_job = MultiDefocusJob(job.particleList, new_reference, job.mask, job.peak_offset, job.sampleInformation, job.bw_range, new_freq, job.destination, job.max_iter-i, job.r_score, job.weighting, job.bfactor)
# distribute it
num_all_particles = self.distribute_job(new_job, verbose)
# calculate the denominator
sum_ctf_squared = None
for pair in job.particleList.pairs:
if sum_ctf_squared is None:
sum_ctf_squared = pair.get_ctf_sqr_vol() * pair.snr
else:
sum_ctf_squared += pair.get_ctf_sqr_vol() * pair.snr
# get the result back
all_even_pre = None
all_even_wedge = None
all_odd_pre = None
all_odd_wedge = None
pls = []
for j in range(len(job.particleList.pairs)):
pls.append(ParticleList())
for j in range(self.num_workers):
result = self.get_result()
pair_id = self.assignment[result.worker_id]
pair = job.particleList.pairs[pair_id]
pl = pls[pair_id]
pl += result.pl
even_pre, even_wedge, odd_pre, odd_wedge = self.retrieve_res_vols(result.name)
if all_even_pre:
all_even_pre += even_pre * pair.snr
all_even_wedge += even_wedge
all_odd_pre += odd_pre * pair.snr
all_odd_wedge += odd_wedge
else:
all_even_pre = even_pre * pair.snr
all_even_wedge = even_wedge
all_odd_pre = odd_pre * pair.snr
all_odd_wedge = odd_wedge
# write the new particle list to the disk
for j in range(len(job.particleList.pairs)):
pls[j].toXMLFile('aligned_pl'+str(j)+'_iter'+str(i)+'.xml')
# correct for the number of particles in wiener filter
sum_ctf_squared = sum_ctf_squared/num_all_particles
# all_even_pre = all_even_pre/(num_all_particles/2)
# all_odd_pre = all_odd_pre/(num_all_particles/2)
# bfactor
if job.bfactor and job.bfactor != 'None':
# bfactor_kernel = create_bfactor_vol(sum_ctf_squared.sizeX(), job.sampleInformation.getPixelSize(), job.bfactor)
bfactor_kernel = read(job.bfactor)
bfactor_kernel_sqr = vol(bfactor_kernel)
power(bfactor_kernel_sqr, 2)
all_even_pre = convolute(all_even_pre, bfactor_kernel, True)
all_odd_pre = convolute(all_odd_pre, bfactor_kernel, True)
sum_ctf_squared = sum_ctf_squared*bfactor_kernel_sqr
# determine the resolution
if verbose:
print(self.node_name + ': determining the resolution ...')
even = self.create_average(all_even_pre, sum_ctf_squared, all_even_wedge) # assume that the CTF sum is the same for the even and odd
odd = self.create_average(all_odd_pre, sum_ctf_squared, all_odd_wedge)
# apply symmetries before determine resolution
even = job.symmetries.applyToParticle(even)
odd = job.symmetries.applyToParticle(odd)
resNyquist, resolutionBand, numberBands = self.determine_resolution(even, odd, job.fsc_criterion, None, job.mask, verbose)
# write the half set to the disk
even.write('fsc_'+str(i)+'_even.em')
odd.write('fsc_'+str(i)+'_odd.em')
current_resolution = bandToAngstrom(resolutionBand, job.sampleInformation.getPixelSize(), numberBands, 1)
if verbose:
print(self.node_name + ': current resolution ' + str(current_resolution), resNyquist)
# create new average
all_even_pre += all_odd_pre
all_even_wedge += all_odd_wedge
# all_even_pre = all_even_pre/2 # correct for the number of particles in wiener filter
average = self.create_average(all_even_pre, sum_ctf_squared, all_even_wedge)
# apply symmetries
average = job.symmetries.applyToParticle(average)
# filter average to resolution and update the new reference
average_name = 'average_iter'+str(i)+'.em'
average.write(average_name)
new_reference = Reference(average_name)
# low pass filter the reference and write it to the disk
filtered = lowpassFilter(average, ceil(resolutionBand), ceil(resolutionBand)/10)
filtered_ref_name = 'average_iter'+str(i)+'_res'+str(current_resolution)+'.em'
filtered[0].write(filtered_ref_name)
# change the frequency to a higher value
new_freq = int(ceil(resolutionBand))+1
if new_freq <= old_freq:
if job.adaptive_res is not False: # two different strategies
print(self.node_name + ': Determined resolution gets worse. Include additional %f percent frequency to be aligned!' % job.adaptive_res)
new_freq = int((1+job.adaptive_res)*old_freq)
else: # always increase by 1
print(self.node_name + ': Determined resolution gets worse. Increase the frequency to be aligned by 1!')
new_freq = old_freq+1
old_freq = new_freq
else:
old_freq = new_freq
if new_freq >= numberBands:
print(self.node_name + ': Determined frequency too high. Terminate!')
break
if verbose:
print(self.node_name + ': change the frequency to ' + str(new_freq))
# send end signal to other nodes and terminate itself
self.end(verbose)
else:
# other nodes
self.run(verbose)
v2Filename)
elif particleList:
print('Resolution determined for ', particleList, ' ')
print('')
print('FSC Criterion: ', fscCriterion)
print('Number of Bands: ', numberBands)
print('')
print('Nyquist: ', r[0])
print('Band: ', r[1])
if pixelSize:
from pytom.basic.resolution import bandToAngstrom
print('Resolution determined for pixelsize : ', pixelSize, ' at ',
bandToAngstrom(r[1], pixelSize, numberBands), ' Angstrom')
else:
print('XML')
if plot and v1Filename and v2Filename:
import matplotlib
import numpy
matplotlib.use('Qt5Agg')
from pylab import subplots, savefig, show
fig, ax = subplots(1, 1, figsize=(10, 5))
ax.plot(f, label='FSC orig')
if randomize:
ax.plot(fsc_rand, label='FSC rand')
ax.plot(fsc_corr, label='FSC corrected')