put global transformation in a separate library

1 files changed, 23 insertions, 0 deletions

diff --git a/speech_utils/init.lua b/speech_utils/init.lua
new file mode 100644
index 0000000..5148664
--- /dev/null
+++ b/speech_utils/init.lua
@@ -0,0 +1,23 @@
+nerv.speech_utils = {}
+
+function nerv.speech_utils.global_transf(feat_utter, global_transf, frm_ext, gconf)
+    local res = {}
+    local step = frm_ext * 2 + 1
+    -- expand the feature
+    local expanded = gconf.cumat_type(feat_utter:nrow(), feat_utter:ncol() * step)
+    expanded:expand_frm(gconf.cumat_type.new_from_host(feat_utter), frm_ext)
+    -- rearrange the feature (``transpose'' operation in TNet)
+    local rearranged = expanded:create()
+    rearranged:rearrange_frm(expanded, step)
+    -- prepare for transf
+    local input = {rearranged}
+    local output = {rearranged:create()}
+    -- do transf
+    global_transf:init(input[1]:nrow())
+    global_transf:propagate(input, output)
+    -- trim frames
+    expanded = gconf.mmat_type(output[1]:nrow() - frm_ext * 2, output[1]:ncol())
+    output[1]:copy_toh(expanded, frm_ext, feat_utter:nrow() - frm_ext)
+    collectgarbage("collect")
+    return expanded
+end