don't regenerate manifests if they already exists

src/corpora/multilingual_librispeech.jl

@@ -95,21 +95,27 @@ function supervisions(lang, dir, subset)
 end
 
 function prepare(::MultilingualLibriSpeechCorpus, lang, dir)
+    # 1. Recording manifests.
     for subset in ["train", "dev", "test"]
         out = joinpath(dir, "recording-manifest-$subset.jsonl")
         @info "preparing recording manifest ($subset) $out"
-        recs = recordings(lang, dir, subset)
-        open(out, "w") do f
-            writemanifest(f, recs)
+        if ! isfile(out)
+            recs = recordings(lang, dir, subset)
+            open(out, "w") do f
+                writemanifest(f, recs)
+            end
         end
     end
 
+    # 2. Supervision manifests.
     for subset in ["train", "dev", "test"]
         out = joinpath(dir, "supervision-manifest-$subset.jsonl")
         @info "preparing supervision manifest ($subset) $out"
-        sups = supervisions(lang, dir, subset)
-        open(out, "w") do f
-            writemanifest(f, sups)
+        if ! isfile(out)
+            sups = supervisions(lang, dir, subset)
+            open(out, "w") do f
+                writemanifest(f, sups)
+            end
         end
     end
 end