[NFC] polish test component gpt code style (#1567)

tests/components_to_test/gpt.py

@@ -47,8 +47,15 @@ class GPTLMModel(nn.Module):
         # Only return lm_logits
         return self.model(input_ids=input_ids, attention_mask=attention_mask, use_cache=not self.checkpoint)[0]
 
+
 def gpt2_micro(checkpoint=True):
-    return GPTLMModel(checkpoint=checkpoint, hidden_size=32, num_layers=2, num_attention_heads=4, max_seq_len=64, vocab_size=128)
+    return GPTLMModel(checkpoint=checkpoint,
+                      hidden_size=32,
+                      num_layers=2,
+                      num_attention_heads=4,
+                      max_seq_len=64,
+                      vocab_size=128)
+
 
 def gpt2_s(checkpoint=True):
     return GPTLMModel(checkpoint=checkpoint)