code: def create_epoch():
      row = 12
      col = 5
      mat = prng.rand(row, col).astype(np.float32)
      mat = zscore(mat, axis=0, ddof=0)
      # if zscore fails (standard deviation is zero),
      # set all values to be zero
      mat = np.nan_to_num(mat)
      mat = mat / math.sqrt(mat.shape[0])
      return mat
  
file_path: brainiak/tests/fcma/test_voxel_selection.py
imports: import conftest
  from brainiak.fcma.voxelselector import VoxelSelector
  from scipy.stats.mstats import zscore
  from sklearn import svm
  from sklearn.linear_model import LogisticRegression
  import numpy
  import math
  from mpi4py import MPI
  from numpy.random import RandomState
label_desc: Use image node_id 1 for calling a global function with example usage: create_epoch() and returns: mat