def fft_psd_multithreading(args):
"""helper function to parallelize get_noise_fft
Parameters:
-----------
Y: ndarray
input movie (n_pixels x Time), can be also memory mapped file
sn_s: ndarray (memory mapped)
file where to store the results of computation.
i: int
pixel index start
num_pixels: int
number of pixel to select starting from i
**kwargs: dict
arguments to be passed to get_noise_fft
"""
(Y, i, num_pixels, kwargs) = args
Yold = Y
if type(Y) is str:
Y, _, _ = load_memmap(Y)
idxs = range(i, i + num_pixels)
res, psx = get_noise_fft(Y[idxs], **kwargs)
#print("[Worker %d] sn for row %d is %f" % (os.getpid(), i, sn_s[0]))
return (idxs, res, psx)
def fft_psd_multithreading(args):
"""helper function to parallelize get_noise_fft
Parameters:
-----------
Y: ndarray
input movie (n_pixels x Time), can be also memory mapped file
sn_s: ndarray (memory mapped)
file where to store the results of computation.
i: int
pixel index start
num_pixels: int
number of pixel to select starting from i
**kwargs: dict
arguments to be passed to get_noise_fft
"""
(Y,i,num_pixels,kwargs)=args
Yold=Y
if type(Y) is str:
Y,_,_=load_memmap(Y)
idxs=range(i,i+num_pixels)
res,psx=get_noise_fft(Y[idxs], **kwargs)
#print("[Worker %d] sn for row %d is %f" % (os.getpid(), i, sn_s[0]))
return (idxs,res,psx)
def lars_regression_noise_ipyparallel(pars):
# need to import since it is run from within the server
import numpy as np
import os
import sys
import gc
Y_name, C_name, noise_sn, idxs_C, idxs_Y = pars
Y, _, _ = load_memmap(Y_name)
Y = np.array(Y[idxs_Y, :])
C = np.load(C_name, mmap_mode='r')
C = np.array(C)
_, T = np.shape(C)
#sys.stdout = open(str(os.getpid()) + ".out", "w")
As = []
# print "*****************:" + str(idxs_Y[0]) + ',' + str(idxs_Y[-1])
sys.stdout.flush()
for y, px in zip(Y, idxs_Y):
# print str(time.time()-st) + ": Pixel" + str(px)
sys.stdout.flush()
# print px,len(idxs_C),C.shape
c = C[idxs_C[px], :]
if np.size(c) > 0:
sn = noise_sn[px]**2 * T
_, _, a, _, _ = lars_regression_noise(y, c.T, 1, sn)
if not np.isscalar(a):
a = a.T
As.append((px, idxs_C[px], a))
del Y
del C
gc.collect()
return As
def lars_regression_noise_ipyparallel(pars):
# need to import since it is run from within the server
import numpy as np
import os
import sys
import gc
Y_name, C_name, noise_sn, idxs_C, idxs_Y = pars
Y, _, _ = load_memmap(Y_name)
Y = np.array(Y[idxs_Y, :])
C = np.load(C_name, mmap_mode='r')
C = np.array(C)
_, T = np.shape(C)
#sys.stdout = open(str(os.getpid()) + ".out", "w")
As = []
# print "*****************:" + str(idxs_Y[0]) + ',' + str(idxs_Y[-1])
sys.stdout.flush()
for y, px in zip(Y, idxs_Y):
# print str(time.time()-st) + ": Pixel" + str(px)
sys.stdout.flush()
# print px,len(idxs_C),C.shape
c = C[idxs_C[px], :]
if np.size(c) > 0:
sn = noise_sn[px]**2 * T
_, _, a, _, _ = lars_regression_noise(y, c.T, 1, sn)
if not np.isscalar(a):
a = a.T
As.append((px, idxs_C[px], a))
del Y
del C
gc.collect()
return As
def cnmf_patches(args_in):
import numpy as np
import ca_source_extraction as cse
import time
import logging
# file_name, idx_,shapes,p,gSig,K,fudge_fact=args_in
file_name, idx_,shapes,options=args_in
name_log=file_name[:-5]+ '_LOG_ ' + str(idx_[0])+'_'+str(idx_[-1])
logger = logging.getLogger(name_log)
hdlr = logging.FileHandler('./'+name_log)
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
hdlr.setFormatter(formatter)
logger.addHandler(hdlr)
logger.setLevel(logging.INFO)
p=options['temporal_params']['p']
logger.info('START')
Yr,_,_,_=load_memmap(file_name)
logger.info('Read file')
Yr=Yr[idx_,:]
Yr.filename=file_name
d,T=Yr.shape
Y=np.reshape(Yr,(shapes[1],shapes[0],T),order='F')
Y.filename=file_name
# ssub,tsub = options['patch_params']['ssub'],options['patch_params']['tsub']
# if ssub>1 or tsub>1:
# Y = cse.initialization.downscale_local_mean(Y,(ssub,ssub,tsub))
[d1,d2,T]=Y.shape
# pl.imshow(np.mean(Y,axis=-1))
# pl.pause(.1)
# import pdb
# pdb.set_trace()
# options = cse.utilities.CNMFSetParms(Y,p=p,gSig=gSig,K=K)
options['spatial_params']['d2']=d1
options['spatial_params']['d1']=d2
Yr,sn,g,psx=cse.pre_processing.preprocess_data(Yr,**options['preprocess_params'])
logger.info('Preprocess Data')
Ain, Cin, b_in, f_in, center=cse.initialization.initialize_components(Y, **options['init_params'])
logger.info('Initialize Components')
A,b,Cin = cse.spatial.update_spatial_components(Yr, Cin, f_in, Ain, sn=sn, **options['spatial_params'])
options['temporal_params']['p'] = 0 # set this to zero for fast updating without deconvolution
logger.info('Spatial Update')
C,f,S,bl,c1,neurons_sn,g,YrA = cse.temporal.update_temporal_components(Yr,A,b,Cin,f_in,bl=None,c1=None,sn=None,g=None,**options['temporal_params'])
logger.info('Temporal Update')
A_m,C_m,nr_m,merged_ROIs,S_m,bl_m,c1_m,sn_m,g_m=cse.merging.merge_components(Yr,A,b,C,f,S,sn,options['temporal_params'], options['spatial_params'], bl=bl, c1=c1, sn=neurons_sn, g=g, thr=options['merging']['thr'], fast_merge = True)
logger.info('Merge Components')
A2,b2,C2 = cse.spatial.update_spatial_components(Yr, C_m, f, A_m, sn=sn, **options['spatial_params'])
logger.info('Update Spatial II')
options['temporal_params']['p'] = p # set it back to original value to perform full deconvolution
C2,f2,S2,bl2,c12,neurons_sn2,g21,YrA = cse.temporal.update_temporal_components(Yr,A2,b2,C2,f,bl=None,c1=None,sn=None,g=None,**options['temporal_params'])
logger.info('Update Temporal II')
Y=[]
Yr=[]
return idx_,shapes,A2,b2,C2,f2,S2,bl2,c12,neurons_sn2,g21,sn,options
def cnmf_patches(args_in):
import numpy as np
import ca_source_extraction as cse
import time
import logging
# file_name, idx_,shapes,p,gSig,K,fudge_fact=args_in
file_name, idx_, shapes, options = args_in
name_log = os.path.basename(file_name[:-5]) + '_LOG_ ' + str(
idx_[0]) + '_' + str(idx_[-1])
logger = logging.getLogger(name_log)
hdlr = logging.FileHandler('./' + name_log)
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
hdlr.setFormatter(formatter)
logger.addHandler(hdlr)
logger.setLevel(logging.INFO)
p = options['temporal_params']['p']
logger.info('START')
logger.info('Read file')
Yr, _, _ = load_memmap(file_name)
Yr = Yr[idx_, :]
if (np.sum(np.abs(np.diff(Yr)))) > 0.1:
Yr.filename = file_name
d, T = Yr.shape
Y = np.reshape(Yr, (shapes[1], shapes[0], T), order='F')
Y.filename = file_name
[d1, d2, T] = Y.shape
options['spatial_params']['dims'] = (d1, d2)
logger.info('Preprocess Data')
Yr, sn, g, psx = cse.pre_processing.preprocess_data(
Yr, **options['preprocess_params'])
logger.info('Initialize Components')
Ain, Cin, b_in, f_in, center = cse.initialization.initialize_components(
Y, **options['init_params'])
# import pdb
# pdb.set_trace()
nA = np.squeeze(np.array(np.sum(np.square(Ain), axis=0)))
nr = len(nA)
Cin = coo_matrix(Cin)
YA = (Ain.T.dot(Yr).T) * scipy.sparse.spdiags(1. / nA, 0, nr, nr)
AA = ((Ain.T.dot(Ain)) * scipy.sparse.spdiags(1. / nA, 0, nr, nr))
YrA = YA - Cin.T.dot(AA)
Cin = Cin.todense()
if options['patch_params']['only_init']:
return idx_, shapes, coo_matrix(
Ain
), b_in, Cin, f_in, None, None, None, None, g, sn, options, YrA.T
else:
logger.info('Spatial Update')
A, b, Cin = cse.spatial.update_spatial_components(
Yr, Cin, f_in, Ain, sn=sn, **options['spatial_params'])
options['temporal_params'][
'p'] = 0 # set this to zero for fast updating without deconvolution
logger.info('Temporal Update')
C, f, S, bl, c1, neurons_sn, g, YrA = cse.temporal.update_temporal_components(
Yr,
A,
b,
Cin,
f_in,
bl=None,
c1=None,
sn=None,
g=None,
**options['temporal_params'])
logger.info('Merge Components')
A_m, C_m, nr_m, merged_ROIs, S_m, bl_m, c1_m, sn_m, g_m = cse.merging.merge_components(
Yr,
A,
b,
C,
f,
S,
sn,
options['temporal_params'],
options['spatial_params'],
bl=bl,
c1=c1,
sn=neurons_sn,
g=g,
thr=options['merging']['thr'],
fast_merge=True)
logger.info('Update Spatial II')
A2, b2, C2 = cse.spatial.update_spatial_components(
Yr, C_m, f, A_m, sn=sn, **options['spatial_params'])
logger.info('Update Temporal II')
options['temporal_params'][
'p'] = p # set it back to original value to perform full deconvolution
C2, f2, S2, bl2, c12, neurons_sn2, g21, YrA = cse.temporal.update_temporal_components(
Yr,
A2,
b2,
C2,
f,
bl=None,
c1=None,
sn=None,
g=None,
**options['temporal_params'])
Y = []
Yr = []
logger.info('Done!')
return idx_, shapes, A2, b2, C2, f2, S2, bl2, c12, neurons_sn2, g21, sn, options, YrA
else:
return None
def update_spatial_components(Y, C, f, A_in, sn=None, d1=None, d2=None, min_size=3, max_size=8, dist=3,
method='ellipse', expandCore=None, backend='single_thread', n_processes=4, n_pixels_per_process=128 ):
"""update spatial footprints and background through Basis Pursuit Denoising
for each pixel i solve the problem
[A(i,:),b(i)] = argmin sum(A(i,:))
subject to
|| Y(i,:) - A(i,:)*C + b(i)*f || <= sn(i)*sqrt(T);
for each pixel the search is limited to a few spatial components
Parameters
----------
Y: np.ndarray (2D)
movie, raw data in 2D (pixels x time).
C: np.ndarray
calcium activity of each neuron.
f: np.ndarray
temporal profile of background activity.
Ain: np.ndarray
spatial profile of background activity.
d1: [optional] int
x movie dimension
d2: [optional] int
y movie dimension
min_size: [optional] int
max_size: [optional] int
dist: [optional] int
sn: [optional] float
noise associated with each pixel if known
n_processes: [optional] int
number of threads to use when the backend is multiprocessing,threading, or ipyparallel
backend [optional] str
'ipyparallel', 'single_thread'
single_thread:no parallelization. It can be used with small datasets.
ipyparallel: uses ipython clusters and then send jobs to each of them
n_pixels_per_process: [optional] int
number of pixels to be processed by each thread
method: [optional] string
method used to expand the search for pixels 'ellipse' or 'dilate'
expandCore: [optional] scipy.ndimage.morphology
if method is dilate this represents the kernel used for expansion
Returns
--------
A: np.ndarray
new estimate of spatial footprints
b: np.ndarray
new estimate of spatial background
C: np.ndarray
temporal components (updated only when spatial components are completely removed)
"""
if expandCore is None:
expandCore = iterate_structure(generate_binary_structure(2, 1), 2).astype(int)
if d1 is None or d2 is None:
raise Exception('You need to define the input dimensions')
if Y.ndim<2 and not type(Y) is str:
Y = np.atleast_2d(Y)
if Y.shape[1] == 1:
raise Exception('Dimension of Matrix Y must be pixels x time')
C = np.atleast_2d(C)
if C.shape[1] == 1:
raise Exception('Dimension of Matrix C must be neurons x time')
f = np.atleast_2d(f)
if f.shape[1] == 1:
raise Exception('Dimension of Matrix f must be neurons x time ')
if len(A_in.shape) == 1:
A_in = np.atleast_2d(A_in).T
if A_in.shape[0] == 1:
raise Exception('Dimension of Matrix A must be pixels x neurons ')
start_time = time.time()
Cf = np.vstack((C, f)) # create matrix that include background components
[d, T] = np.shape(Y)
if n_pixels_per_process > d:
raise Exception(
'The number of pixels per process (n_pixels_per_process) is larger than the total number of pixels!! Decrease suitably.')
nr, _ = np.shape(C) # number of neurons
IND = determine_search_location(
A_in, d1, d2, method=method, min_size=min_size, max_size=max_size, dist=dist, expandCore=expandCore)
print " find search location"
ind2_ = [np.hstack((np.where(iid_)[0], nr + np.arange(f.shape[0])))
if np.size(np.where(iid_)[0]) > 0 else [] for iid_ in IND]
folder = tempfile.mkdtemp()
# use the ipyparallel package, you need to start a cluster server
# (ipcluster command) in order to use it
if backend == 'ipyparallel':
C_name = os.path.join(folder, 'C_temp.npy')
np.save(C_name, Cf)
if type(Y) is np.core.memmap: # if input file is already memory mapped then find the filename
Y_name = Y.filename
# if not create a memory mapped version (necessary for parallelization)
elif type(Y) is str:
Y_name = Y
else:
Y_name = os.path.join(folder, 'Y_temp.npy')
np.save(Y_name, Y)
Y,_,_,_=load_memmap(Y_name)
# create arguments to be passed to the function. Here we are grouping
# bunch of pixels to be processed by each thread
pixel_groups = [(Y_name, C_name, sn, ind2_, range(i, i + n_pixels_per_process))
for i in range(0, d1 * d2 - n_pixels_per_process + 1, n_pixels_per_process)]
A_ = np.zeros((d, nr + np.size(f, 0)))
try: # if server is not running and raise exception if not installed or not started
from ipyparallel import Client
c = Client()
except:
print "this backend requires the installation of the ipyparallel (pip install ipyparallel) package and starting a cluster (type ipcluster start -n 6) where 6 is the number of nodes"
raise
if len(c) < n_processes:
print len(c)
raise Exception(
"the number of nodes in the cluster are less than the required processes: decrease the n_processes parameter to a suitable value")
dview = c[:n_processes] # use the number of processes
#serial_result = map(lars_regression_noise_ipyparallel, pixel_groups)
parallel_result = dview.map_sync(lars_regression_noise_ipyparallel, pixel_groups)
# clean up
for chunk in parallel_result:
for pars in chunk:
px, idxs_, a = pars
A_[px, idxs_] = a
dview.results.clear()
c.purge_results('all')
c.purge_everything()
c.close()
elif backend == 'single_thread':
Cf_ = [Cf[idx_, :] for idx_ in ind2_]
#% LARS regression
A_ = np.hstack((np.zeros((d, nr)), np.zeros((d, np.size(f, 0)))))
for c, y, s, id2_, px in zip(Cf_, Y, sn, ind2_, range(d)):
if px % 1000 == 0:
print px
if np.size(c) > 0:
_, _, a, _, _ = lars_regression_noise(y, np.array(c.T), 1, sn[px]**2 * T)
if np.isscalar(a):
A_[px, id2_] = a
else:
A_[px, id2_] = a.T
else:
raise Exception(
'Unknown backend specified: use single_thread, threading, multiprocessing or ipyparallel')
#%
print 'Updated Spatial Components'
A_ = threshold_components(A_, d1, d2)
print "threshold"
ff = np.where(np.sum(A_, axis=0) == 0) # remove empty components
if np.size(ff) > 0:
ff = ff[0]
print('eliminating empty components!!')
nr = nr - len(ff)
A_ = np.delete(A_, list(ff), 1)
C = np.delete(C, list(ff), 0)
A_ = A_[:, :nr]
A_ = coo_matrix(A_)
# import pdb
# pdb.set_trace()
Y_resf = np.dot(Y, f.T) - A_.dot(coo_matrix(C[:nr, :]).dot(f.T))
print "Computing A_bas"
A_bas = np.fmax(Y_resf / scipy.linalg.norm(f)**2, 0) # update baseline based on residual
# A_bas = np.fmax(np.dot(Y_res,f.T)/scipy.linalg.norm(f)**2,0) # update
# baseline based on residual
b = A_bas
print("--- %s seconds ---" % (time.time() - start_time))
try: # clean up
# remove temporary file created
print "Remove temporary file created"
shutil.rmtree(folder)
except:
raise Exception("Failed to delete: " + folder)
return A_, b, C
def update_spatial_components(Y,
C=None,
f=None,
A_in=None,
sn=None,
dims=None,
min_size=3,
max_size=8,
dist=3,
method='ellipse',
expandCore=None,
dview=None,
n_pixels_per_process=128,
medw=(3, 3),
thr_method='nrg',
maxthr=0.1,
nrgthr=0.9999,
extract_cc=True,
se=np.ones((3, 3), dtype=np.int),
ss=np.ones((3, 3), dtype=np.int),
nb=1):
"""update spatial footprints and background through Basis Pursuit Denoising
for each pixel i solve the problem
[A(i,:),b(i)] = argmin sum(A(i,:))
subject to
|| Y(i,:) - A(i,:)*C + b(i)*f || <= sn(i)*sqrt(T);
for each pixel the search is limited to a few spatial components
Parameters
----------
Y: np.ndarray (2D or 3D)
movie, raw data in 2D or 3D (pixels x time).
C: np.ndarray
calcium activity of each neuron.
f: np.ndarray
temporal profile of background activity.
A_in: np.ndarray
spatial profile of background activity. If A_in is boolean then it defines the spatial support of A.
Otherwise it is used to determine it through determine_search_location
dims: [optional] tuple
x, y[, z] movie dimensions
min_size: [optional] int
max_size: [optional] int
dist: [optional] int
sn: [optional] float
noise associated with each pixel if known
backend [optional] str
'ipyparallel', 'single_thread'
single_thread:no parallelization. It can be used with small datasets.
ipyparallel: uses ipython clusters and then send jobs to each of them
SLURM: use the slurm scheduler
n_pixels_per_process: [optional] int
number of pixels to be processed by each thread
method: [optional] string
method used to expand the search for pixels 'ellipse' or 'dilate'
expandCore: [optional] scipy.ndimage.morphology
if method is dilate this represents the kernel used for expansion
dview: view on ipyparallel client
you need to create an ipyparallel client and pass a view on the processors (client = Client(), dview=client[:])
medw, thr_method, maxthr, nrgthr, extract_cc, se, ss: [optional]
Parameters for components post-processing. Refer to spatial.threshold_components for more details
nb: [optional] int
Number of background components
Returns
--------
A: np.ndarray
new estimate of spatial footprints
b: np.ndarray
new estimate of spatial background
C: np.ndarray
temporal components (updated only when spatial components are completely removed)
"""
if expandCore is None:
expandCore = iterate_structure(generate_binary_structure(2, 1),
2).astype(int)
if dims is None:
raise Exception('You need to define the input dimensions')
if Y.ndim < 2 and not type(Y) is str:
Y = np.atleast_2d(Y)
if Y.shape[1] == 1:
raise Exception('Dimension of Matrix Y must be pixels x time')
if C is not None:
C = np.atleast_2d(C)
if C.shape[1] == 1:
raise Exception('Dimension of Matrix C must be neurons x time')
if f is not None:
f = np.atleast_2d(f)
if f.shape[1] == 1:
raise Exception(
'Dimension of Matrix f must be background comps x time ')
if (A_in is None) and (C is None):
raise Exception('Either A or C need to be determined')
if A_in is not None:
if len(A_in.shape) == 1:
A_in = np.atleast_2d(A_in).T
if A_in.shape[0] == 1:
raise Exception('Dimension of Matrix A must be pixels x neurons ')
start_time = time.time()
[d, T] = np.shape(Y)
if A_in is None:
A_in = np.ones((d, np.shape(C)[1]), dtype=bool)
if n_pixels_per_process > d:
raise Exception(
'The number of pixels per process (n_pixels_per_process) is larger than the total number of pixels!! Decrease suitably.'
)
if f is not None:
nb = f.shape[0]
else:
if b is not None:
nb = b.shape[1]
if A_in.dtype == bool:
IND = A_in.copy()
print "spatial support for each components given by the user"
if C is None:
INDav = IND.astype('float32') / np.sum(IND, axis=0)
px = (np.sum(IND, axis=1) > 0)
model = NMF(n_components=nb, init='random', random_state=0)
b = model.fit_transform(np.maximum(Y[~px, :], 0))
f = model.components_.squeeze()
#f = np.mean(Y[~px,:],axis=0)
Y_resf = np.dot(Y, f.T)
b = np.fmax(Y_resf.dot(np.linalg.inv(f.dot(f.T)), 0))
#b = np.fmax(Y_resf / scipy.linalg.norm(f)**2, 0)
C = np.fmax(
csr_matrix(INDav.T).dot(Y) - np.outer(INDav.T.dot(b), f), 0)
f = np.atleast_2d(f)
else:
IND = determine_search_location(A_in,
dims,
method=method,
min_size=min_size,
max_size=max_size,
dist=dist,
expandCore=expandCore,
dview=dview)
print "found spatial support for each component"
if C is None:
raise Exception('You need to provide estimate of C and f')
print np.shape(A_in)
Cf = np.vstack((C, f)) # create matrix that include background components
nr, _ = np.shape(C) # number of neurons
ind2_ = [
np.hstack(
(np.where(iid_)[0], nr +
np.arange(f.shape[0]))) if np.size(np.where(iid_)[0]) > 0 else []
for iid_ in IND
]
if os.environ.get('SLURM_SUBMIT_DIR') is not None:
tmpf = os.environ.get('SLURM_SUBMIT_DIR')
print 'cluster temporary folder:' + tmpf
folder = tempfile.mkdtemp(dir=tmpf)
else:
folder = tempfile.mkdtemp()
# use the ipyparallel package, you need to start a cluster server
# (ipcluster command) in order to use it
C_name = os.path.join(folder, 'C_temp.npy')
np.save(C_name, Cf)
if type(
Y
) is np.core.memmap: # if input file is already memory mapped then find the filename
Y_name = Y.filename
# if not create a memory mapped version (necessary for parallelization)
elif type(Y) is str or dview is None:
Y_name = Y
else:
raise Exception('Not implemented consistently')
Y_name = os.path.join(folder, 'Y_temp.npy')
np.save(Y_name, Y)
Y, _, _, _ = load_memmap(Y_name)
# create arguments to be passed to the function. Here we are grouping
# bunch of pixels to be processed by each thread
# pixel_groups = [(Y_name, C_name, sn, ind2_, range(i, i + n_pixels_per_process))
# for i in range(0, np.prod(dims) - n_pixels_per_process + 1, n_pixels_per_process)]
pixel_groups = []
for i in range(0,
np.prod(dims) - n_pixels_per_process + 1,
n_pixels_per_process):
pixel_groups.append(
[Y_name, C_name, sn, ind2_,
range(i, i + n_pixels_per_process)])
if i < np.prod(dims):
pixel_groups.append(
[Y_name, C_name, sn, ind2_,
range(i, np.prod(dims))])
A_ = np.zeros((d, nr + np.size(f, 0)))
#serial_result = map(lars_regression_noise_ipyparallel, pixel_groups)
if dview is not None:
parallel_result = dview.map_sync(lars_regression_noise_ipyparallel,
pixel_groups)
dview.results.clear()
for chunk in parallel_result:
for pars in chunk:
px, idxs_, a = pars
A_[px, idxs_] = a
else:
# parallel_result = map(lars_regression_noise_ipyparallel, pixel_groups)
# for chunk in parallel_result:
# for pars in chunk:
# px, idxs_, a = pars
# A_[px, idxs_] = a
Cf_ = [Cf[idx_, :] for idx_ in ind2_]
#% LARS regression
A_ = np.hstack((np.zeros((d, nr)), np.zeros((d, np.size(f, 0)))))
for c, y, s, id2_, px in zip(Cf_, Y, sn, ind2_, range(d)):
if px % 1000 == 0:
print px
if np.size(c) > 0:
_, _, a, _, _ = lars_regression_noise(y, np.array(c.T), 1,
sn[px]**2 * T)
if np.isscalar(a):
A_[px, id2_] = a
else:
A_[px, id2_] = a.T
#
#%
print 'Updated Spatial Components'
A_ = threshold_components(A_,
dims,
dview=dview,
medw=(3, 3),
thr_method=thr_method,
maxthr=maxthr,
nrgthr=nrgthr,
extract_cc=extract_cc,
se=se,
ss=ss)
print "threshold"
ff = np.where(np.sum(A_, axis=0) == 0) # remove empty components
if np.size(ff) > 0:
ff = ff[0]
print('eliminating empty components!!')
nr = nr - len(ff)
A_ = np.delete(A_, list(ff), 1)
C = np.delete(C, list(ff), 0)
A_ = A_[:, :nr]
A_ = coo_matrix(A_)
#import pdb
#pdb.set_trace()
Y_resf = np.dot(Y, f.T) - A_.dot(coo_matrix(C[:nr, :]).dot(f.T))
print "Computing A_bas"
A_bas = np.fmax(Y_resf.dot(np.linalg.inv(f.dot(f.T))),
0) # update baseline based on residual
#A_bas = np.fmax(Y_resf / scipy.linalg.norm(f)**2, 0) # update baseline based on residual
# baseline based on residual
b = A_bas
print("--- %s seconds ---" % (time.time() - start_time))
try: # clean up
# remove temporary file created
print "Remove temporary file created"
shutil.rmtree(folder)
except:
raise Exception("Failed to delete: " + folder)
if A_in.dtype == bool:
return A_, b, C, f
else:
return A_, b, C
def cnmf_patches(args_in):
import numpy as np
import ca_source_extraction as cse
import time
import logging
# file_name, idx_,shapes,p,gSig,K,fudge_fact=args_in
file_name, idx_, shapes, options = args_in
name_log = file_name[:-5] + '_LOG_ ' + str(idx_[0]) + '_' + str(idx_[-1])
logger = logging.getLogger(name_log)
hdlr = logging.FileHandler('./' + name_log)
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
hdlr.setFormatter(formatter)
logger.addHandler(hdlr)
logger.setLevel(logging.INFO)
p = options['temporal_params']['p']
logger.info('START')
Yr, _, _, _ = load_memmap(file_name)
logger.info('Read file')
Yr = Yr[idx_, :]
Yr.filename = file_name
d, T = Yr.shape
Y = np.reshape(Yr, (shapes[1], shapes[0], T), order='F')
Y.filename = file_name
# ssub,tsub = options['patch_params']['ssub'],options['patch_params']['tsub']
# if ssub>1 or tsub>1:
# Y = cse.initialization.downscale_local_mean(Y,(ssub,ssub,tsub))
[d1, d2, T] = Y.shape
# pl.imshow(np.mean(Y,axis=-1))
# pl.pause(.1)
# import pdb
# pdb.set_trace()
# options = cse.utilities.CNMFSetParms(Y,p=p,gSig=gSig,K=K)
options['spatial_params']['d2'] = d1
options['spatial_params']['d1'] = d2
Yr, sn, g, psx = cse.pre_processing.preprocess_data(
Yr, **options['preprocess_params'])
logger.info('Preprocess Data')
Ain, Cin, b_in, f_in, center = cse.initialization.initialize_components(
Y, **options['init_params'])
logger.info('Initialize Components')
A, b, Cin = cse.spatial.update_spatial_components(
Yr, Cin, f_in, Ain, sn=sn, **options['spatial_params'])
options['temporal_params'][
'p'] = 0 # set this to zero for fast updating without deconvolution
logger.info('Spatial Update')
C, f, S, bl, c1, neurons_sn, g, YrA = cse.temporal.update_temporal_components(
Yr,
A,
b,
Cin,
f_in,
bl=None,
c1=None,
sn=None,
g=None,
**options['temporal_params'])
logger.info('Temporal Update')
A_m, C_m, nr_m, merged_ROIs, S_m, bl_m, c1_m, sn_m, g_m = cse.merging.merge_components(
Yr,
A,
b,
C,
f,
S,
sn,
options['temporal_params'],
options['spatial_params'],
bl=bl,
c1=c1,
sn=neurons_sn,
g=g,
thr=options['merging']['thr'],
fast_merge=True)
logger.info('Merge Components')
A2, b2, C2 = cse.spatial.update_spatial_components(
Yr, C_m, f, A_m, sn=sn, **options['spatial_params'])
logger.info('Update Spatial II')
options['temporal_params'][
'p'] = p # set it back to original value to perform full deconvolution
C2, f2, S2, bl2, c12, neurons_sn2, g21, YrA = cse.temporal.update_temporal_components(
Yr,
A2,
b2,
C2,
f,
bl=None,
c1=None,
sn=None,
g=None,
**options['temporal_params'])
logger.info('Update Temporal II')
Y = []
Yr = []
return idx_, shapes, A2, b2, C2, f2, S2, bl2, c12, neurons_sn2, g21, sn, options
def update_spatial_components(Y,
C,
f,
A_in,
sn=None,
d1=None,
d2=None,
min_size=3,
max_size=8,
dist=3,
method='ellipse',
expandCore=None,
backend='single_thread',
n_processes=4,
n_pixels_per_process=128):
"""update spatial footprints and background through Basis Pursuit Denoising
for each pixel i solve the problem
[A(i,:),b(i)] = argmin sum(A(i,:))
subject to
|| Y(i,:) - A(i,:)*C + b(i)*f || <= sn(i)*sqrt(T);
for each pixel the search is limited to a few spatial components
Parameters
----------
Y: np.ndarray (2D)
movie, raw data in 2D (pixels x time).
C: np.ndarray
calcium activity of each neuron.
f: np.ndarray
temporal profile of background activity.
Ain: np.ndarray
spatial profile of background activity.
d1: [optional] int
x movie dimension
d2: [optional] int
y movie dimension
min_size: [optional] int
max_size: [optional] int
dist: [optional] int
sn: [optional] float
noise associated with each pixel if known
n_processes: [optional] int
number of threads to use when the backend is multiprocessing,threading, or ipyparallel
backend [optional] str
'ipyparallel', 'single_thread'
single_thread:no parallelization. It can be used with small datasets.
ipyparallel: uses ipython clusters and then send jobs to each of them
n_pixels_per_process: [optional] int
number of pixels to be processed by each thread
method: [optional] string
method used to expand the search for pixels 'ellipse' or 'dilate'
expandCore: [optional] scipy.ndimage.morphology
if method is dilate this represents the kernel used for expansion
Returns
--------
A: np.ndarray
new estimate of spatial footprints
b: np.ndarray
new estimate of spatial background
C: np.ndarray
temporal components (updated only when spatial components are completely removed)
"""
if expandCore is None:
expandCore = iterate_structure(generate_binary_structure(2, 1),
2).astype(int)
if d1 is None or d2 is None:
raise Exception('You need to define the input dimensions')
if Y.ndim < 2 and not type(Y) is str:
Y = np.atleast_2d(Y)
if Y.shape[1] == 1:
raise Exception('Dimension of Matrix Y must be pixels x time')
C = np.atleast_2d(C)
if C.shape[1] == 1:
raise Exception('Dimension of Matrix C must be neurons x time')
f = np.atleast_2d(f)
if f.shape[1] == 1:
raise Exception('Dimension of Matrix f must be neurons x time ')
if len(A_in.shape) == 1:
A_in = np.atleast_2d(A_in).T
if A_in.shape[0] == 1:
raise Exception('Dimension of Matrix A must be pixels x neurons ')
start_time = time.time()
Cf = np.vstack((C, f)) # create matrix that include background components
[d, T] = np.shape(Y)
if n_pixels_per_process > d:
raise Exception(
'The number of pixels per process (n_pixels_per_process) is larger than the total number of pixels!! Decrease suitably.'
)
nr, _ = np.shape(C) # number of neurons
IND = determine_search_location(A_in,
d1,
d2,
method=method,
min_size=min_size,
max_size=max_size,
dist=dist,
expandCore=expandCore)
print " find search location"
ind2_ = [
np.hstack(
(np.where(iid_)[0], nr +
np.arange(f.shape[0]))) if np.size(np.where(iid_)[0]) > 0 else []
for iid_ in IND
]
folder = tempfile.mkdtemp()
# use the ipyparallel package, you need to start a cluster server
# (ipcluster command) in order to use it
if backend == 'ipyparallel':
C_name = os.path.join(folder, 'C_temp.npy')
np.save(C_name, Cf)
if type(
Y
) is np.core.memmap: # if input file is already memory mapped then find the filename
Y_name = Y.filename
# if not create a memory mapped version (necessary for parallelization)
elif type(Y) is str:
Y_name = Y
else:
Y_name = os.path.join(folder, 'Y_temp.npy')
np.save(Y_name, Y)
Y, _, _, _ = load_memmap(Y_name)
# create arguments to be passed to the function. Here we are grouping
# bunch of pixels to be processed by each thread
pixel_groups = [(Y_name, C_name, sn, ind2_,
range(i, i + n_pixels_per_process))
for i in range(0, d1 * d2 - n_pixels_per_process +
1, n_pixels_per_process)]
A_ = np.zeros((d, nr + np.size(f, 0)))
try: # if server is not running and raise exception if not installed or not started
from ipyparallel import Client
c = Client()
except:
print "this backend requires the installation of the ipyparallel (pip install ipyparallel) package and starting a cluster (type ipcluster start -n 6) where 6 is the number of nodes"
raise
if len(c) < n_processes:
print len(c)
raise Exception(
"the number of nodes in the cluster are less than the required processes: decrease the n_processes parameter to a suitable value"
)
dview = c[:n_processes] # use the number of processes
#serial_result = map(lars_regression_noise_ipyparallel, pixel_groups)
parallel_result = dview.map_sync(lars_regression_noise_ipyparallel,
pixel_groups)
# clean up
for chunk in parallel_result:
for pars in chunk:
px, idxs_, a = pars
A_[px, idxs_] = a
dview.results.clear()
c.purge_results('all')
c.purge_everything()
c.close()
elif backend == 'single_thread':
Cf_ = [Cf[idx_, :] for idx_ in ind2_]
#% LARS regression
A_ = np.hstack((np.zeros((d, nr)), np.zeros((d, np.size(f, 0)))))
for c, y, s, id2_, px in zip(Cf_, Y, sn, ind2_, range(d)):
if px % 1000 == 0:
print px
if np.size(c) > 0:
_, _, a, _, _ = lars_regression_noise(y, np.array(c.T), 1,
sn[px]**2 * T)
if np.isscalar(a):
A_[px, id2_] = a
else:
A_[px, id2_] = a.T
else:
raise Exception(
'Unknown backend specified: use single_thread, threading, multiprocessing or ipyparallel'
)
#%
print 'Updated Spatial Components'
A_ = threshold_components(A_, d1, d2)
print "threshold"
ff = np.where(np.sum(A_, axis=0) == 0) # remove empty components
if np.size(ff) > 0:
ff = ff[0]
print('eliminating empty components!!')
nr = nr - len(ff)
A_ = np.delete(A_, list(ff), 1)
C = np.delete(C, list(ff), 0)
A_ = A_[:, :nr]
A_ = coo_matrix(A_)
# import pdb
# pdb.set_trace()
Y_resf = np.dot(Y, f.T) - A_.dot(coo_matrix(C[:nr, :]).dot(f.T))
print "Computing A_bas"
A_bas = np.fmax(Y_resf / scipy.linalg.norm(f)**2,
0) # update baseline based on residual
# A_bas = np.fmax(np.dot(Y_res,f.T)/scipy.linalg.norm(f)**2,0) # update
# baseline based on residual
b = A_bas
print("--- %s seconds ---" % (time.time() - start_time))
try: # clean up
# remove temporary file created
print "Remove temporary file created"
shutil.rmtree(folder)
except:
raise Exception("Failed to delete: " + folder)
return A_, b, C