class_docstr: Class to hold the matrix type.
code: def __repr__(self):
      return "HBMatrixType(%s, %s, %s)" % (
          self.value_type,
          self.structure,
          self.storage,
      )
  
imports: from __future__ import division, print_function, absolute_import
  import warnings
  import numpy
  from scipy.sparse import csc_matrix
  from scipy.io.harwell_boeing._fortran_format_parser import FortranFormatParser, IntFormat, ExpFormat
label_desc: Use image node_id 4 for calling the HBMatrixType obj's underlying member method code with example usage: obj.__repr__() and returns: unknown