code: def finv(x):
      return 1 / (1 + np.exp(-x))
  
imports: import copy
  import numpy
  import pandas
  import scipy.sparse
  from sklearn.cluster import KMeans
  from sklearn.impute import SimpleImputer
label_desc: Use image node_id 3 for calling the LogitLink obj's underlying member method code with example usage: obj.finv(x) and returns: unknown