Source code for relion.protocols.protocol_sort

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# * Authors:     Grigory Sharov     (
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# * MRC Laboratory of Molecular Biology, MRC-LMB
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import pyworkflow.object as pwobj
from pyworkflow.protocol.params import (PointerParam, FloatParam, StringParam,
                                        BooleanParam, IntParam, LEVEL_ADVANCED)
from pyworkflow.utils import removeExt
from pwem.protocols import ProtParticles
from pwem.objects import SetOfParticles, SetOfClasses
import pwem.emlib.metadata as md
from pwem.emlib.image import ImageHandler

import relion.convert as convert

[docs]class ProtRelionSortParticles(ProtParticles): """ Relion particle sorting protocol. It calculates difference images between particles and their aligned (and CTF-convoluted) references, and produces Z-score on the characteristics of these difference images (such as mean, standard deviation, skewness, excess kurtosis and rotational symmetry). """ _label = 'sort particles' # -------------------------- DEFINE param functions ----------------------- def _defineParams(self, form): form.addSection(label='Input') form.addParam('inputSet', PointerParam, pointerClass='SetOfParticles,SetOfClasses2D,SetOfClasses3D', label='Input particles', important=True, help='Select a set of particles after Relion auto-picking' ' or 3D refinement. You can also select Relion 2D/3D' ' classes. Particles should have at least in-plane ' 'alignment parameters and class assignment.') form.addParam('referenceAverages', PointerParam, pointerClass="SetOfAverages", condition='inputSet and isInputAutoPicking', label='Reference 2D averages', help='Select references 2D averages used for auto-picking') form.addParam('referenceVolume', PointerParam, pointerClass="Volume", condition='inputSet and isInputAutoRefine', label='Reference volume', help='Select reference volume 2D after 3D auto-refine') form.addParam('maskDiameterA', IntParam, default=-1, label='Particle mask diameter (A)', help='The experimental images will be masked with a ' 'soft circular mask with this <diameter>. Make ' 'sure this diameter is not set too small because ' 'that may mask away part of the signal! If set to ' 'a value larger than the image size no masking ' 'will be performed.\n\n' 'The same diameter will also be used for a ' 'spherical mask of the reference structures if no ' 'user-provided mask is specified.') form.addParam('doLowPass', IntParam, default=-1, expertLevel=LEVEL_ADVANCED, label='Low pass filter references to (A):', help='Lowpass filter in Angstroms for the references ' '(prevent Einstein-from-noise!)') form.addParam('doInvert', BooleanParam, default=False, expertLevel=LEVEL_ADVANCED, label='Invert contrast of references?', help='Density in particles is inverted compared to the ' 'density in references') form.addParam('doCTF', BooleanParam, default=False, expertLevel=LEVEL_ADVANCED, label='Do CTF-correction?', help='If set to Yes, CTFs will be corrected inside the ' 'MAP refinement. The resulting algorithm ' 'intrinsically implements the optimal linear, ' 'or Wiener filter. Note that input particles ' 'should contains CTF parameters.') form.addParam('ignoreCTFUntilFirstPeak', BooleanParam, default=False, expertLevel=LEVEL_ADVANCED, condition='doCTF', label='Ignore CTFs until their first peak?', help='If set to Yes, then CTF-amplitude correction will ' 'only be performed from the first peak of each CTF ' 'onward. This can be useful if the CTF model is ' 'inadequate at the lowest resolution. Still, in ' 'general using higher amplitude contrast on the ' 'CTFs (e.g. 10-20%) often yields better results. ' 'Therefore, this option is not generally ' 'recommended.') form.addParam('minZ', FloatParam, default=0, expertLevel=LEVEL_ADVANCED, label='Min Z-value?', help='Minimum Z-value to count in the sorting of ' 'outliers') form.addParam('extraParams', StringParam, default='', expertLevel=LEVEL_ADVANCED, label='Additional parameters', help='In this box command-line arguments may be ' 'provided that are not generated by the GUI. This ' 'may be useful for testing developmental options ' 'and/or expert use of the program, e.g: \n' '--verb 1\n') form.addParallelSection(threads=0, mpi=1) # -------------------------- INSERT steps functions -----------------------
[docs] def isInputAutoPicking(self): inputSet = self.inputSet.get() return (isinstance(inputSet, SetOfParticles) and not inputSet.hasAlignmentProj())
[docs] def isInputAutoRefine(self): inputSet = self.inputSet.get() return (isinstance(inputSet, SetOfParticles) and inputSet.hasAlignmentProj())
[docs] def isInputClasses(self): return isinstance(self.inputSet.get(), SetOfClasses)
def _insertAllSteps(self): self._createFilenameTemplates() refAvg = self.referenceAverages.get() avgId = refAvg.getObjId() if refAvg is not None else None refVol = self.referenceVolume.get() volId = refVol.getObjId() if refVol is not None else None self._insertFunctionStep('convertInputStep', self.inputSet.get().getObjId(), avgId, volId) self._insertRelionStep() self._insertFunctionStep('createOutputStep') def _insertRelionStep(self): """ Prepare the command line arguments before calling Relion. """ # Join in a single line all key, value pairs of the args dict args = {} self._setArgs(args) params = ' '.join(['%s %s' % (k, str(v)) for k, v in args.items()]) if self.extraParams.hasValue(): params += ' ' + self.extraParams.get() self._insertFunctionStep('runRelionStep', params) # -------------------------- STEPS functions ------------------------------ def _createFilenameTemplates(self): """ Centralize how files are called. """ myDict = { 'input_particles': self._getExtraPath(''), 'input_refs': self._getExtraPath(''), 'output_star': self._getExtraPath(''), 'input_refvol': self._getTmpPath('input_vol.mrc') } self._updateFilenamesDict(myDict)
[docs] def convertInputStep(self, inputId, avgId, volId): """ Create the input file in STAR format as expected by Relion. If the input particles comes from Relion, just link the file. Params: particlesId: use this parameters just to force redo of convert if the input particles are changed. """ inputSet = self.inputSet.get() imgStar = self._getFileName('input_particles') refStar = self._getFileName('input_refs') # Pass stack file as None to avoid write the images files"Converting set from '%s' into '%s'" % (inputSet.getFileName(), imgStar)) refSet = None # case refine3D if self.isInputClasses(): refSet = self.inputSet.get() # 2D or 3D classes else: if self.isInputAutoRefine(): ImageHandler().convert(self.referenceVolume.get(), self._getFileName('input_refvol')) else: # Autopicking case refSet = self.referenceAverages.get() self.classDict = {} if refSet:"Converting reference from '%s' into %s" % (refSet.getFileName(), refStar)) # Compute class mapping classList = [cls.getObjId() for cls in refSet] classList.sort() for i, c in enumerate(classList): self.classDict[c] = i + 1 convert.writeReferences( refSet, removeExt(refStar), postprocessImageRow=self._updateClasses) # Write particles star file allParticles = self._allParticles(iterate=False) convert.writeSetOfParticles( allParticles, imgStar, outputDir=self._getPath(), postprocessImageRow=self._postProcessImageRow)
[docs] def runRelionStep(self, params): """ Execute relion steps with given params. """ self.runJob(self._getProgram(), params)
[docs] def createOutputStep(self): sortedImgSet = self._createSetOfParticles() particles = self._sampleParticles() sortedImgSet.copyInfo(particles) particlesIter = self._allParticles(iterate=False) sortedStar = self._getFileName('output_star') sortedImgSet.copyItems(particlesIter, updateItemCallback=self._updateZScore, itemDataIterator=md.iterRows(sortedStar)) self._defineOutputs(outputParticles=sortedImgSet) self._defineSourceRelation(self.inputSet, sortedImgSet)
# -------------------------- INFO functions ------------------------------- def _validate(self): errors = [] return errors def _summary(self): summary = [] if not hasattr(self, 'outputParticles'): summary.append("Output particles not ready yet.") else: summary.append("Input %s particles were sorted by Z-score: %s" % (self.inputSet.get().getSize(), self.getObjectTag('outputParticles'))) return summary # -------------------------- UTILS functions ------------------------------ def _allParticles(self, iterate=False): # A handler function to iterate over the particles inputSet = self.inputSet.get() if self.isInputClasses(): iterParticles = inputSet.iterClassItems() if iterate: return iterParticles else: particles = SetOfParticles(filename=":memory:") particles.copyInfo(inputSet.getFirstItem()) particles.copyItems(iterParticles) return particles else: if iterate: return inputSet.iterItems() else: return inputSet def _sampleParticles(self): """ Return the input particles set, or the first class in the case the input are classes. """ if self.isInputClasses(): return self.inputSet.get().getFirstItem() else: return self.inputSet.get() def _setArgs(self, args): particles = self._sampleParticles() if self.maskDiameterA <= 0: maskDiameter = particles.getSamplingRate() * particles.getXDim() else: maskDiameter = self.maskDiameterA.get() args.update({'--i': self._getFileName('input_particles'), '--particle_diameter': maskDiameter, '--angpix': particles.getSamplingRate(), '--min_z': self.minZ.get() }) args['--o'] = self._getFileName('output_star') angpixRef = None if self.isInputAutoRefine(): args['--ref'] = self._getFileName('input_refvol') angpixRef = self.referenceVolume.get().getSamplingRate() else: args['--ref'] = self._getFileName('input_refs') if self.referenceAverages.hasValue(): angpixRef = self.referenceAverages.get().getSamplingRate() if angpixRef is not None: args['--angpix_ref'] = '%0.5f' % angpixRef if self.doInvert: args['--invert'] = '' if self.ignoreCTFUntilFirstPeak: args['--ctf_intact_first_peak'] = '' if self.doCTF: args['--ctf'] = '' def _getProgram(self, program='relion_particle_sort'): """ Get the program name depending on the MPI use or not. """ if self.numberOfMpi > 1: program += '_mpi' return program def _postProcessImageRow(self, img, imgRow): if self.classDict: classId = img.getClassId() if classId is not None: if classId not in self.classDict: raise Exception("Class Id %s from particle %s is not found" % (classId, img.getObjId())) newClassId = self.classDict[classId] else: newClassId = imgRow.getValue(md.RLN_PARTICLE_CLASS) else: newClassId = 1 imgRow.setValue(md.RLN_PARTICLE_CLASS, newClassId) def _updateClasses(self, img, imgRow): index, _ = img.getLocation() # renumber class numbers imgRow.setValue(md.RLN_PARTICLE_CLASS, int(index)) def _updateZScore(self, img, imgRow): zscore = imgRow.getValue(md.RLN_SELECT_PARTICLES_ZSCORE) img._rlnSelectParticlesZscore = pwobj.Float(zscore)