-- and provides some utility functions.
--
-- _NOTE_: parsing the files is done using blocking i/o file operations.
--
-- @copyright 2016-2020 Kong Inc.
-- @author Thijs Schreijer
-- @license Apache 2.0


local _M = {}
local utils = require("pl.utils")
local gsub = string.gsub
local tinsert = table.insert
local time = ngx.now

[^Bischof1987]: C Bischof and C Van Loan, "The WY representation for products of Householder matrices", SIAM J Sci Stat Comput 8 (1987), s2-s13. [doi:10.1137/0908009](https://doi.org/10.1137/0908009)

[^Schreiber1989]: R Schreiber and C Van Loan, "A storage-efficient WY representation for products of Householder transformations", SIAM J Sci Stat Comput 10 (1989), 53-57. [doi:10.1137/0910005](https://doi.org/10.1137/0910005)
"""