def mk_dcm_dataset(timepoints,z,noise_sd):
data=numpy.zeros((len(timepoints),len(z)))
for i in range(1,len(timepoints)):
data[i,:]=data[i-1,:] + dcm_model(timepoints[i],data[i-1,:],A,B,C,u) + numpy.random.randn(len(z))*noise_sd
hrf=spm_hrf(stepsize,oversampling=1)
data_conv=numpy.zeros(data.shape)
for i in range(len(z)):
data_conv[:,i]=numpy.convolve(data[:,i],hrf)[:data.shape[0]]
return data,data_conv
import numpy
import nibabel
from nipy.modalities.fmri.hemodynamic_models import spm_hrf,compute_regressor
import os
outdir='../results/dcmfiles'
if not os.path.exists(outdir):
os.mkdir(outdir)
dcmdata=numpy.load('../results/dcmdata.npz')
data_conv=dcmdata['data']
u=numpy.convolve(dcmdata['u'],spm_hrf(0.01,oversampling=1))
u=u[range(0,data_conv.shape[0],int(1./0.01))]
ntp=u.shape[0]
data=data_conv[range(0,data_conv.shape[0],int(1./0.01))]
roi_locations=[[2,2,2],[4,4,4],[6,6,6],[8,8,8],[10,10,10]]
datamat=numpy.zeros((12,12,12,ntp))
datamat[2:11,2:11,2:11,:]+=100
for i in range(5):
datamat[roi_locations[i][0],roi_locations[i][1],roi_locations[i][2],:]+=data[:,i]
img=nibabel.Nifti1Image(datamat,numpy.identity(4))
img.to_filename(os.path.join(outdir,'all.nii'))
for i in range(ntp):
tmp=datamat[:,:,:,i]
img=nibabel.Nifti1Image(tmp,numpy.identity(4))
img.to_filename(os.path.join(outdir,'img%03d.nii'%i))
#############################################################################
#Compute Tstats image for each block
#############################################################################
T = np.zeros((128, number_features))
betas = np.zeros((128, number_features))
subject = np.zeros((128))
subject_num = 0
t = 0
from nipy.modalities.fmri import hemodynamic_models
hrf = hemodynamic_models.spm_hrf(tr=3.0,
oversampling=1,
onset=0.0,
time_length=400)
DesignMat = np.zeros((132, 8))
DesignMat[20:27:, 0] = np.arange(1, 8)
DesignMat[34:41:, 1] = np.arange(1, 8)
DesignMat[48:55, 2] = np.arange(1, 8)
DesignMat[62:69, 3] = np.arange(1, 8)
DesignMat[76:83, 4] = np.arange(1, 8)
DesignMat[90:97, 5] = np.arange(1, 8)
DesignMat[104:111, 6] = np.arange(1, 8)
DesignMat[118:125, 7] = np.arange(1, 8)
lab = np.zeros((132))
lab[20:27] = 1
lab[34:41] = 1
if not os.path.exists(results_dir):
os.mkdir(results_dir)
# Load the data generated using the DCM forward model. In this model, there is a significant static connectivity from 1->2 and 1->3 (A matrix), and a PPI for 0->2 and 0->4 (B matrix) and a significant input to ROI 0 (C matrix).
# In[2]:
_,data_conv,params=sim_dcm_dataset(verbose=True)
A_mtx=params['A']
B_mtx=params['B']
u=params['u']
# downsample design to 1 second TR
u=numpy.convolve(params['u'],spm_hrf(params['stepsize'],oversampling=1))
u=u[range(0,data_conv.shape[0],int(1./params['stepsize']))]
ntp=u.shape[0]
# ###Generate a set of synthetic datasets, referring to individual subjects
# In[3]:
tetrad_dir='/home/vagrant/data/tetrad_files'
if not os.path.exists(tetrad_dir):
os.mkdir(tetrad_dir)
nfiles=10
def loadTaskTiming(subj, task, taskModel='canonical', nRegsFIR=25):
nRunsPerTask = 2
taskkey = task[6:] # Define string identifier for tasks
taskEVs = taskEV_Identifier[taskkey]
stimMat = np.zeros(
(taskLength[taskkey] * nRunsPerTask, len(taskEV_Identifier[taskkey])))
stimdir = basedir + 'HCP352Data/data/timingfiles3/'
stimfiles = glob.glob(stimdir + subj + '*EV*' + taskkey + '*1D')
for stimcount in range(len(taskEVs)):
ev = taskEVs[stimcount] + 1
stimfile = glob.glob(stimdir + subj + '*EV' + str(ev) + '_' + taskkey +
'*1D')
stimMat[:, stimcount] = np.loadtxt(stimfile[0])
nTRsPerRun = int(stimMat.shape[0] / 2.0)
##
if taskModel == 'FIR':
# Convolve taskstim regressors based on SPM canonical HRF (likely period of task-induced activity)
## First set up FIR design matrix
stim_index = []
taskStims_FIR = []
for stim in range(stimMat.shape[1]):
taskStims_FIR.append([])
time_ind = np.where(stimMat[:, stim] == 1)[0]
blocks = _group_consecutives(
time_ind) # Get blocks (i.e., sets of consecutive TRs)
# Identify the longest block - set FIR duration to longest block
maxRegsForBlocks = 0
for block in blocks:
if len(block) > maxRegsForBlocks: maxRegsForBlocks = len(block)
taskStims_FIR[stim] = np.zeros(
(stimMat.shape[0], maxRegsForBlocks + nRegsFIR)
) # Task timing for this condition is TR x length of block + FIR lag
stim_index.extend(np.repeat(stim, maxRegsForBlocks + nRegsFIR))
stim_index = np.asarray(stim_index)
## Now fill in FIR design matrix
# Make sure to cut-off FIR models for each run separately
trcount = 0
for run in range(nRunsPerTask):
trstart = trcount
trend = trstart + nTRsPerRun
for stim in range(stimMat.shape[1]):
time_ind = np.where(stimMat[:, stim] == 1)[0]
blocks = _group_consecutives(
time_ind) # Get blocks (i.e., sets of consecutive TRs)
for block in blocks:
reg = 0
for tr in block:
# Set impulses for this run/task only
if trstart < tr < trend:
taskStims_FIR[stim][tr, reg] = 1
reg += 1
if not trstart < tr < trend:
continue # If TR not in this run, skip this block
# If TR is not in this run, skip this block
if not trstart < tr < trend: continue
# Set lag due to HRF
for lag in range(1, nRegsFIR + 1):
# Set impulses for this run/task only
if trstart < tr + lag < trend:
taskStims_FIR[stim][tr + lag, reg] = 1
reg += 1
trcount += nTRsPerRun
taskStims_FIR2 = np.zeros((stimMat.shape[0], 1))
task_index = []
for stim in range(stimMat.shape[1]):
task_index.extend(np.repeat(stim, taskStims_FIR[stim].shape[1]))
taskStims_FIR2 = np.hstack((taskStims_FIR2, taskStims_FIR[stim]))
taskStims_FIR2 = np.delete(taskStims_FIR2, 0, axis=1)
#taskRegressors = np.asarray(taskStims_FIR)
taskRegressors = taskStims_FIR2
# To prevent SVD does not converge error, make sure there are no columns with 0s
zero_cols = np.where(np.sum(taskRegressors, axis=0) == 0)[0]
taskRegressors = np.delete(taskRegressors, zero_cols, axis=1)
stim_index = np.delete(stim_index, zero_cols)
elif taskModel == 'canonical':
##
# Convolve taskstim regressors based on SPM canonical HRF (likely period of task-induced activity)
taskStims_HRF = np.zeros(stimMat.shape)
spm_hrfTS = spm_hrf(trLength, oversampling=1)
trcount = 0
for run in range(nRunsPerTask):
trstart = trcount
trend = trstart + nTRsPerRun
for stim in range(stimMat.shape[1]):
# Perform convolution
tmpconvolve = np.convolve(stimMat[trstart:trend, stim],
spm_hrfTS)
tmpconvolve_run = tmpconvolve[:
nTRsPerRun] # Make sure to cut off at the end of the run
taskStims_HRF[trstart:trend, stim] = tmpconvolve_run
trcount += nTRsPerRun
taskRegressors = taskStims_HRF.copy()
stim_index = []
for stim in range(stimMat.shape[1]):
stim_index.append(stim)
stim_index = np.asarray(stim_index)
# Create temporal mask (skipping which frames?)
tMask = []
tmp = np.ones((nTRsPerRun, ), dtype=bool)
tmp[:framesToSkip] = False
tMask.extend(tmp)
tMask.extend(tmp)
tMask = np.asarray(tMask, dtype=bool)
output = {}
# Commented out since we demean each run prior to loading data anyway
output['taskRegressors'] = taskRegressors[tMask, :]
output['taskDesignMat'] = stimMat[tMask, :]
output['stimIndex'] = stim_index
return output
