Update iwslt14.py

iwslt14.py

@@ -175,15 +175,16 @@ class IWSLT14(datasets.GeneratorBasedBuilder):
         talk_id = f"d{doc_counter}"
         flag = ""
         for source_file, target_file in zip(source_files, target_files):
-            src = _parse(source_file)
-            trg = _parse(target_file)
-
-            for k, src_sent in src.items():
-                if k in trg:
-                    trg_sent = trg[k]
-
-                    yield id_, {
-                        "id": k,
-                        "translation": {source: src_sent, target: trg_sent}
-                    }
-                    id_ += 1
+            if Path(source_file).is_file() and Path(target_file).is_file():
+                src = _parse(source_file)
+                trg = _parse(target_file)
+    
+                for k, src_sent in src.items():
+                    if k in trg:
+                        trg_sent = trg[k]
+    
+                        yield id_, {
+                            "id": k,
+                            "translation": {source: src_sent, target: trg_sent}
+                        }
+                        id_ += 1