[bugfix]修复fitlogcallback在disttrainner中无法添加dev_data 的问题 (#348)

fix the distTrainer dev_data

Author: ROGERDJQ

fastNLP/core/dist_trainer.py

@@ -177,8 +177,13 @@ def __init__(self, train_data, model, optimizer=None, loss=None,
         self.batch_size = self.world_size * self.batch_size_per_gpu
         self.n_steps = self._get_n_steps()
 
+        self.dev_data = dev_data
+        self.metrics = metrics
+        self.test_use_tqdm = True
+        self.kwargs = kwargs
         self.test_use_tqdm = kwargs.get('test_use_tqdm', self.use_tqdm)
         dev_batch_size = kwargs.get('dev_batch_size', batch_size_per_gpu)
+
         # for evaluation, only run eval on master proc
         if dev_data and metrics:
             cb = _TesterCallback(