add BLEU&comet

Former-commit-id: 8d3f934c77c728e3cff19093962e705b501806d1

evaluation/scores/scores.py

@@ -0,0 +1,13 @@
+from comet import download_model, load_from_checkpoint
+from sacrebleu.metrics import BLEU, CHRF, TER
+
+def COMETscore(src, mt, ref):
+    data = [{"src":src, "mt":mt, "ref":ref}]
+    model_path = download_model("Unbabel/wmt22-comet-da")
+    model = load_from_checkpoint(model_path)
+    model_output = model.predict(data, batch_size = 8, gpus=1)
+    return model_output
+
+def BLEUscore(sys, refs):
+    bleu = BLEU()
+    return bleu.corpus_score(sys, refs)