small fix for NMT build job (#119)

Author: johnml1135

machine/translation/huggingface/hugging_face_nmt_model_trainer.py

@@ -102,10 +102,11 @@ def __init__(
         self._add_unk_trg_tokens = add_unk_trg_tokens
         self._mpn = MosesPunctNormalizer()
         self._mpn.substitutions = [(re.compile(r), sub) for r, sub in self._mpn.substitutions]
+        self._stats = TrainStats()
 
     @property
     def stats(self) -> TrainStats:
-        return super().stats
+        return self._stats
 
     def train(
         self,
@@ -366,6 +367,7 @@ def preprocess_function(examples):
 
         self._metrics = train_result.metrics
         self._metrics["train_samples"] = len(train_dataset)
+        self._stats.train_corpus_size = self._metrics["train_samples"]
 
         self._trainer.log_metrics("train", self._metrics)
         logger.info("Model training finished")