class_docstr: OneHot will convert `index` into a onehot vector.
code: def transform(self, t):
      if self.output is None:
          self.output = self.be.iobuf(
              self.nclasses * t.shape[0], dtype=np.int32
          )
          self.outview = self.output.reshape((self.nclasses, -1))
      self.outview[:] = self.be.onehot(t.reshape((1, -1)), axis=0)
      return self.output
  
imports: from __future__ import division
  import numpy
  from neon import NervanaObject
label_desc: Use image node_id 2 for calling the PixelWiseOneHot obj's underlying member method code with example usage: obj.transform(t) and returns: self