Remove useless variables in infer_batch.py (#651)

Author: Ying1123

python/sglang/srt/managers/controller/infer_batch.py

@@ -270,6 +270,7 @@ class Batch:
     prefix_lens: torch.Tensor = None
     position_ids_offsets: torch.Tensor = None
     out_cache_loc: torch.Tensor = None
+    extend_num_tokens: int = None
 
     # For processing logprobs
     return_logprob: bool = False
@@ -280,10 +281,6 @@ class Batch:
     image_sizes: List[List[int]] = None
     image_offsets: List[int] = None
 
-    # Other arguments for control
-    output_ids: torch.Tensor = None
-    extend_num_tokens: int = None
-
     # Batched sampling params
     temperatures: torch.Tensor = None
     top_ps: torch.Tensor = None
@@ -820,6 +817,7 @@ def init_flashinfer_args(
     prefix_lens,
     flashinfer_decode_wrapper,
 ):
+    """Init auxiliary variables for FlashInfer attention backend."""
     num_qo_heads = model_runner.model_config.num_attention_heads // model_runner.tp_size
     num_kv_heads = model_runner.model_config.get_num_kv_heads(model_runner.tp_size)
     head_dim = model_runner.model_config.head_dim
@@ -885,6 +883,7 @@ def init_flashinfer_args(
 
 
 def init_triton_args(forward_mode, seq_lens, prefix_lens):
+    """Init auxiliary variables for triton attention backend."""
     batch_size = len(seq_lens)
     max_seq_len = int(torch.max(seq_lens))
     start_loc = torch.zeros((batch_size,), dtype=torch.int32, device="cuda")