Unify variable naming: replace is_in_free_group with is_not_in_free_group (#4698)

python/sglang/srt/mem_cache/memory_pool.py

@@ -190,7 +190,7 @@ class TokenToKVPoolAllocator:
         self.free_slots = torch.arange(
             1, self.size + 1, dtype=torch.int64, device=self.device
         )
-        self.is_in_free_group = False
+        self.is_not_in_free_group = True
         self.free_group = []
 
 

python/sglang/srt/mem_cache/paged_allocator.py

@@ -279,5 +279,5 @@ class PagedTokenToKVPoolAllocator:
         self.free_pages = torch.arange(
             1, self.num_pages + 1, dtype=torch.int64, device=self.device
         )
-        self.is_in_free_group = False
+        self.is_not_in_free_group = True
         self.free_group = []