require 'libkaldiio' require 'speech_utils' local KaldiReader = nerv.class("nerv.KaldiReader", "nerv.DataReader") function KaldiReader:__init(global_conf, reader_conf) self.feat_id = reader_conf.id self.frm_ext = reader_conf.frm_ext self.gconf = global_conf self.global_transf = reader_conf.global_transf self.debug = global_conf.debug if self.debug == nil then self.debug = false end self.feat_repo = nerv.KaldiFeatureRepo(reader_conf.feature_rspecifier) self.lab_repo = {} for id, mlf_spec in pairs(reader_conf.mlfs) do self.lab_repo[id] = nerv.KaldiLabelRepo(mlf_spec.targets_rspecifier, mlf_spec.format) end end function KaldiReader:get_data() if self.feat_repo:is_end() then return nil end local res = {} -- read Kaldi feature local feat_utter = self.feat_repo:cur_utter(self.debug) -- global transf local transformed = nerv.speech_utils.global_transf(feat_utter, self.global_transf, self.frm_ext, 0, self.gconf) res[self.feat_id] = transformed -- add corresponding labels for id, repo in pairs(self.lab_repo) do local lab_utter = repo:get_utter(self.feat_repo, self.frm_ext, transformed:nrow(), self.debug) res[id] = lab_utter end -- move the pointer to next self.feat_repo:next() collectgarbage("collect") return res end