"""Morphology classes"""
"""
Copyright (c) 2016-2020, EPFL/Blue Brain Project
This file is part of BluePyOpt <https://github.com/BlueBrain/BluePyOpt>
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License version 3.0 as published
by the Free Software Foundation.
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
# pylint: disable=W0511
import os
import platform
import logging
import pathlib
import bisect
import numpy
from bluepyopt.ephys.base import BaseEPhys
from bluepyopt.ephys.serializer import DictMixin
from bluepyopt.ephys.acc import arbor, ArbLabel
logger = logging.getLogger(__name__)
# TODO define an addressing scheme
[docs]class Morphology(BaseEPhys):
"""Morphology class"""
pass
[docs]class NrnFileMorphology(Morphology, DictMixin):
"""Morphology loaded from a file"""
SERIALIZED_FIELDS = ('morphology_path', 'do_replace_axon', 'do_set_nseg',
'replace_axon_hoc', 'nseg_frequency',
'morph_modifiers', 'morph_modifiers_hoc',
'morph_modifiers_kwargs')
def __init__(
self,
morphology_path,
do_replace_axon=False,
do_set_nseg=True,
comment='',
replace_axon_hoc=None,
nseg_frequency=40,
morph_modifiers=None,
morph_modifiers_hoc=None,
morph_modifiers_kwargs=None):
"""Constructor
Args:
morphology_path (str or Path): location of the file describing the
morphology
do_replace_axon (bool): Does the axon need to be replaced by an AIS
stub with default function ?
replace_axon_hoc (str): Translation in HOC language for the
'replace_axon' method. This code will 'only' be used when
calling create_hoc on a cell model. While the model is run in
python, replace_axon is used instead. Must include
'proc replace_axon(){ ... }
If None,the default replace_axon is used
nseg_frequency (float): frequency of nseg
do_set_nseg (bool): if True, it will use nseg_frequency
morph_modifiers (list): list of functions to modify the icell
with (sim, icell) as arguments
morph_modifiers_hoc (list): list of hoc strings corresponding
to morph_modifiers
morph_modifiers_kwargs (dict): kwargs for morph_modifiers functions
"""
name = os.path.basename(morphology_path)
super(NrnFileMorphology, self).__init__(name=name, comment=comment)
# TODO speed up loading of morphologies from files
# Path to morphology
if isinstance(morphology_path, pathlib.Path):
morphology_path = str(morphology_path)
self.morphology_path = morphology_path
self.do_replace_axon = do_replace_axon
self.do_set_nseg = do_set_nseg
self.nseg_frequency = nseg_frequency
self.morph_modifiers = morph_modifiers
self.morph_modifiers_hoc = morph_modifiers_hoc
self.morph_modifiers_kwargs = morph_modifiers_kwargs
if self.morph_modifiers_kwargs is None:
self.morph_modifiers_kwargs = {}
if replace_axon_hoc is None:
self.replace_axon_hoc = self.default_replace_axon_hoc
else:
self.replace_axon_hoc = replace_axon_hoc
def __str__(self):
"""Return string representation"""
return self.morphology_path
[docs] def instantiate(self, sim=None, icell=None):
"""Load morphology"""
logger.debug('Loading morphology %s', self.morphology_path)
if not os.path.exists(self.morphology_path):
raise IOError(
'Morphology not found at \'%s\'' %
self.morphology_path)
sim.neuron.h.load_file('stdrun.hoc')
sim.neuron.h.load_file('import3d.hoc')
extension = self.morphology_path.split('.')[-1]
if extension.lower() == 'swc':
imorphology = sim.neuron.h.Import3d_SWC_read()
elif extension.lower() == 'asc':
imorphology = sim.neuron.h.Import3d_Neurolucida3()
else:
raise ValueError("Unknown filetype: %s" % extension)
# TODO this is to get rid of stdout print of neuron
# probably should be more intelligent here, and filter out the
# lines we don't want
imorphology.quiet = 1
if platform.system() == 'Windows':
sim.neuron.h.hoc_stdout('NUL')
else:
sim.neuron.h.hoc_stdout('/dev/null')
imorphology.input(str(self.morphology_path))
sim.neuron.h.hoc_stdout()
morphology_importer = sim.neuron.h.Import3d_GUI(imorphology, 0)
morphology_importer.instantiate(icell)
# TODO Set nseg should be called after all the parameters have been
# set
# (in case e.g. Ra was changed)
if self.do_set_nseg:
self.set_nseg(icell)
if self.do_replace_axon:
self.replace_axon(sim=sim, icell=icell)
if self.morph_modifiers is not None:
for morph_modifier in self.morph_modifiers:
morph_modifier(sim=sim, icell=icell,
**self.morph_modifiers_kwargs)
[docs] def destroy(self, sim=None):
"""Destroy morphology instantiation"""
pass
[docs] def set_nseg(self, icell):
"""Set the nseg of every section"""
for section in icell.all:
section.nseg = 1 + 2 * int(section.L / self.nseg_frequency)
[docs] @staticmethod
def replace_axon(sim=None, icell=None):
"""Replace axon"""
nsec = len([sec for sec in icell.axonal])
if nsec == 0:
ais_diams = [1, 1]
elif nsec == 1:
ais_diams = [icell.axon[0].diam, icell.axon[0].diam]
else:
ais_diams = [icell.axon[0].diam, icell.axon[0].diam]
# Define origin of distance function
sim.neuron.h.distance(0, 0.5, sec=icell.soma[0])
for section in icell.axonal:
# If distance to soma is larger than 60, store diameter
if sim.neuron.h.distance(1, 0.5, sec=section) > 60:
ais_diams[1] = section.diam
break
for section in icell.axonal:
sim.neuron.h.delete_section(sec=section)
# Create new axon array
sim.neuron.h.execute('create axon[2]', icell)
for index, section in enumerate(icell.axon):
section.nseg = 1
section.L = 30
section.diam = ais_diams[index]
icell.axonal.append(sec=section)
icell.all.append(sec=section)
icell.axon[0].connect(icell.soma[0], 1.0, 0.0)
icell.axon[1].connect(icell.axon[0], 1.0, 0.0)
logger.debug('Replace axon with AIS')
default_replace_axon_hoc = \
'''
proc replace_axon(){ local nSec, D1, D2
// preserve the number of original axonal sections
nSec = sec_count(axonal)
// Try to grab info from original axon
if(nSec == 0) { //No axon section present
D1 = D2 = 1
} else if(nSec == 1) {
axon[0] D1 = D2 = diam
} else {
axon[0] D1 = D2 = diam
soma distance() //to calculate distance from soma
forsec axonal{
//if section is longer than 60um then store diam and exit from loop
if(distance(0.5) > 60){
D2 = diam
break
}
}
}
// get rid of the old axon
forsec axonal{
delete_section()
}
create axon[2]
axon[0] {
L = 30
diam = D1
nseg = 1 + 2*int(L/40)
all.append()
axonal.append()
}
axon[1] {
L = 30
diam = D2
nseg = 1 + 2*int(L/40)
all.append()
axonal.append()
}
nSecAxonal = 2
soma[0] connect axon[0](0), 1
axon[0] connect axon[1](0), 1
}
'''
[docs]class ArbFileMorphology(Morphology, DictMixin):
"""Arbor morphology utilities"""
# Arbor morphology tags
tags = dict(
soma=1,
axon=2,
dend=3,
apic=4,
myelin=5
)
# Correspondence of BluePyOpt seclists to Arbor region labels
# (renaming locations according to SWC convention: using
# 'dend' for basal dendrite, 'apic' for apical dendrite)
region_labels = dict(
all=ArbLabel(
type='region', name='all', s_expr='(all)'),
somatic=ArbLabel(
type='region', name='soma', s_expr='(tag %i)' % tags['soma']),
axonal=ArbLabel(
type='region', name='axon', s_expr='(tag %i)' % tags['axon']),
basal=ArbLabel(
type='region', name='dend', s_expr='(tag %i)' % tags['dend']),
apical=ArbLabel(
type='region', name='apic', s_expr='(tag %i)' % tags['apic']),
myelinated=ArbLabel(
type='region', name='myelin', s_expr='(tag %i)' % tags['myelin']),
)
[docs] @staticmethod
def load(morpho_filename, replace_axon):
'''Load morphology and optionally perform axon replacement
Args:
morpho_filename (str): Path to file with original morphology.
replace_axon (): Path to/ACC string for morphology to replace
axon with (if not None).
'''
morpho_suffix = pathlib.Path(morpho_filename).suffix
if morpho_suffix == '.acc':
morpho = arbor.load_component(morpho_filename).component
elif morpho_suffix == '.swc':
morpho = arbor.load_swc_arbor(morpho_filename)
elif morpho_suffix == '.asc':
morpho = arbor.load_asc(morpho_filename).morphology
else:
raise RuntimeError(
'Unsupported morphology %s' % morpho_filename +
' (only .swc and .asc supported)')
if replace_axon is not None:
replacement = arbor.load_component(replace_axon).component
morpho = ArbFileMorphology.replace_axon(morpho, replacement)
return morpho
[docs] @staticmethod
def replace_axon(morphology, replacement=None):
'''return a morphology with the axon replaced by another morphology
Args:
morphology (arbor.morphology): The original Arbor morphology
replacement (): An Arbor morphology to replace the axon with
'''
# Check if tag_roots is available
if not hasattr(arbor.segment_tree, 'tag_roots'):
raise NotImplementedError(
"Need a newer version of Arbor for axon replacement.")
# Arbor tags
axon_tag = ArbFileMorphology.tags['axon']
# prune morphology at axon root
st = morphology.to_segment_tree()
axon_roots = st.tag_roots(axon_tag)
if len(axon_roots) > 1:
raise ValueError("Axon replacement is only supported for "
"morphologies with a single axon root.")
elif len(axon_roots) == 1:
axon_root = axon_roots[0]
logger.debug('Axon replacement: splitting segment tree'
' at segment %d.', axon_root)
pruned_st, axon_st = st.split_at(axon_root)
axon_parent = st.parents[axon_root]
else:
pruned_st = st
axon_parent = arbor.mnpos
# join pruned segment tree and replacement at axon parent
axon_replacement_st = replacement.to_segment_tree()
logger.debug('Axon replacement: joining replacement onto'
'pruned tree at parent segment %d.', axon_parent)
joined_st = pruned_st.join_at(
axon_parent, axon_replacement_st)
return arbor.morphology(joined_st)