Compat with latest VLLM 0.4.2 main + fork.number rename + Flashinfer 0.0.4 (#380)

Co-authored-by: ZX <zx@lbx.dev>
Co-authored-by: ZhouXingg <165115237+ZhouXingg@users.noreply.github.com>

python/sglang/lang/interpreter.py

@@ -266,14 +266,14 @@ class StreamExecutor:
 
     def fork(
         self,
-        number: int,
+        size: int = 1,
         position_ids_offset: Optional[List[int]] = None,
     ):
-        if number > 1:
+        if size > 1:
             self.submit(SglCommitLazy())
 
         self.sync()
-        number = int(number)
+        size = int(size)
 
         exes = [
             StreamExecutor(
@@ -283,9 +283,9 @@ class StreamExecutor:
                 self.chat_template,
                 self.stream,
             )
-            for _ in range(number)
+            for _ in range(size)
         ]
-        for i in range(number):
+        for i in range(size):
             exes[i].variables = dict(self.variables)
             exes[i].text_ = str(self.text_)
             exes[i].messages_ = list(self.messages_)
@@ -656,10 +656,10 @@ class ProgramState:
 
     def fork(
         self,
-        number: int = 1,
+        size: int = 1,
         position_ids_offset: Optional[List[int]] = None,
     ):
-        stream_executors = self.stream_executor.fork(number, position_ids_offset)
+        stream_executors = self.stream_executor.fork(size, position_ids_offset)
         states = [ProgramState(x) for x in stream_executors]
         state_group = ProgramStateGroup(states, self)
         return state_group