class_docstr: Compose lower triangular matrix.
class_docstr_tok: ["Compose","lower","triangular","matrix","."]
code: def label(self):
      return "LowerTriangularMatrix"
  
imports: from functools import lru_cache
  from chainer import cuda
  from chainer import function
  from chainer.utils import type_check
  import numpy
label_desc: Use image node_id 2 for calling the LowerTriangularMatrix obj's underlying member method code with example usage: obj.label() and returns: str