Fix E731 flake8 warning (x3).

examples/summarization/run_summarization.py

@@ -184,7 +184,10 @@ def save_rouge_scores(str_scores):
 def build_data_iterator(args, tokenizer):
     dataset = load_and_cache_examples(args, tokenizer)
     sampler = SequentialSampler(dataset)
-    collate_fn = lambda data: collate(data, tokenizer, block_size=512, device=args.device)
+
+    def collate_fn(data):
+        return collate(data, tokenizer, block_size=512, device=args.device)
+
     iterator = DataLoader(dataset, sampler=sampler, batch_size=args.batch_size, collate_fn=collate_fn,)
 
     return iterator

transformers/commands/serving.py

@@ -15,7 +15,10 @@ try:
     _serve_dependancies_installed = True
 except (ImportError, AttributeError):
     BaseModel = object
-    Body = lambda *x, **y: None
+
+    def Body(*x, **y):
+        pass
+
     _serve_dependancies_installed = False
 
 

transformers/modeling_utils.py

@@ -77,7 +77,6 @@ class PreTrainedModel(nn.Module):
     """
     config_class = None
     pretrained_model_archive_map = {}
-    load_tf_weights = lambda model, config, path: None
     base_model_prefix = ""
 
     @property