class_docstr: Initializes array with the identity matrix.
  
  It initializes the given array with the constant
  multiple of the identity matrix.
  Note that arrays to be passed must be 2D squared matrices.
  
  Attributes:
      scale (scalar): A constant to be multiplied to identity matrices.
code: def __init__(self, scale=1.0, dtype=None):
      self.scale = scale
      super(Identity, self).__init__(dtype)
  
imports: import numpy
  import chainer
  from chainer import backend
  from chainer import initializer
  from chainer import types
label_desc: Use image node_id 1 to create a new Identity object from inherited base classes: initializer with example: obj = Identity(scale, dtype)