Simplify chunked prefill (#1667)

python/sglang/srt/managers/scheduler.py

@@ -456,7 +456,12 @@ class Scheduler:
             and not self.last_batch.is_empty()
         ):
             if self.current_inflight_req:
-                self.last_batch.filter_batch(self.current_inflight_req)
+                self.last_batch.filter_batch(
+                    current_inflight_req=self.current_inflight_req
+                )
+                self.tree_cache.cache_unfinished_req(self.current_inflight_req)
+                # Inflight request keeps its rid but will get a new req_pool_idx.
+                self.req_to_token_pool.free(self.current_inflight_req.req_pool_idx)
                 self.batch_is_full = False
             if not self.last_batch.is_empty():
                 if self.running_batch is None:
@@ -728,26 +733,23 @@ class Scheduler:
             # Check finish conditions
             logprob_pt = 0
             for i, req in enumerate(batch.reqs):
-                if req is not self.current_inflight_req:
+                if req.is_inflight_req > 0:
+                    req.is_inflight_req -= 1
+                else:
                     # Inflight reqs' prefill is not finished
                     req.completion_tokens_wo_jump_forward += 1
                     req.output_ids.append(next_token_ids[i])
                     req.check_finished()
 
-                if req.regex_fsm is not None:
-                    req.regex_fsm_state = req.regex_fsm.get_next_state(
-                        req.regex_fsm_state, next_token_ids[i]
-                    )
-
                     if req.finished():
                         self.tree_cache.cache_finished_req(req)
                     elif not batch.decoding_reqs or req not in batch.decoding_reqs:
                         self.tree_cache.cache_unfinished_req(req)
 
-                if req.is_inflight_req > 0:
-                    # Inflight request would get a new req idx
-                    req.is_inflight_req -= 1
-                    self.req_to_token_pool.free(req.req_pool_idx)
+                if req.regex_fsm is not None:
+                    req.regex_fsm_state = req.regex_fsm.get_next_state(
+                        req.regex_fsm_state, next_token_ids[i]
+                    )
 
                 if req.return_logprob:
                     logprob_pt += self.add_logprob_return_values(
@@ -760,7 +762,9 @@ class Scheduler:
             # Check finish conditions
             for i, req in enumerate(batch.reqs):
                 req.embedding = embeddings[i]
-                if req is not self.current_inflight_req:
+                if req.is_inflight_req > 0:
+                    req.is_inflight_req -= 1
+                else:
                     # Inflight reqs' prefill is not finished
                     # dummy output token for embedding models
                     req.output_ids.append(0)
@@ -771,11 +775,6 @@ class Scheduler:
                 else:
                     self.tree_cache.cache_unfinished_req(req)
 
-                if req.is_inflight_req > 0:
-                    # Inflight request would get a new req idx
-                    req.is_inflight_req -= 1
-                    self.req_to_token_pool.free(req.req_pool_idx)
-
         self.stream_output(batch)
 
     def process_batch_result_decode(self, batch: ScheduleBatch, result):