class_docstr: A class to perform Linear Discriminant Analysis.
  
  It returns the low dimensional representation as per LDA.
  
  Arguments
  ---------
  reduced_dim : int
      The dimension of the output representation.
code: def __init__(
      self,
  ):
      self.transform_mat = None
  
imports: import numpy
  import copy
  import pickle
  from scipy import linalg
label_desc: Use image node_id 1 to create a new LDA object  with example: obj = LDA()