minor formatting

modeling_qwen2nsa.py

@@ -25,6 +25,7 @@ except ImportError:
 
 from native_sparse_attention_pytorch import SparseAttention
 
+
 class Qwen2RMSNorm(nn.Module):
     def __init__(self, hidden_size: int, eps: float = 1e-6):
         super().__init__()
@@ -233,6 +234,7 @@ class Qwen2Model(nn.Module):
             out["past_key_values"] = next_cache
         return out
 
+
 class Qwen2NsaForCausalLM(PreTrainedModel, GenerationMixin):
     config_class = Qwen2NsaConfig
     base_model_prefix = "model"