Fix the error message and dependency of openai backend (#71)

README.md

@@ -164,7 +164,8 @@ def image_qa(s, image_file, question):
 ```
 
 ### Constrained Decoding
-Use `regex=` to specify a regular expression as a decoding constraint.
+Use `regex` to specify a regular expression as a decoding constraint.
+This is only supported for local models.
 
 ```python
 @sgl.function

python/pyproject.toml

@@ -18,10 +18,11 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-srt = ["fastapi", "psutil", "rpyc", "torch", "uvloop", "uvicorn", "zmq", "vllm>=0.2.5",
-       "interegular", "lark", "numba", "pydantic", "diskcache", "cloudpickle"]
-openai = ["openai>=1.0"]
-anthropic = ["anthropic"]
+srt = ["fastapi", "psutil", "rpyc", "torch", "uvloop", "uvicorn",
+       "zmq", "vllm>=0.2.5", "interegular", "lark", "numba",
+       "pydantic", "diskcache", "cloudpickle"]
+openai = ["openai>=1.0", "numpy"]
+anthropic = ["anthropic", "numpy"]
 all = ["sglang[srt]", "sglang[openai]", "sglang[anthropic]"]
 
 [project.urls]

python/sglang/backend/openai.py

@@ -77,7 +77,9 @@ class OpenAI(BaseBackend):
     ):
         if sampling_params.dtype is None:
             if self.is_chat_model:
-                assert s.text_.endswith("ASSISTANT:")
+                if not s.text_.endswith("ASSISTANT:"):
+                    raise RuntimeError("This use case is not supported. "
+                        "For OpenAI chat models, sgl.gen must be right after sgl.assistant")
                 prompt = s.messages_
             else:
                 prompt = s.text_
@@ -149,6 +151,12 @@ class OpenAI(BaseBackend):
         choices: List[str],
         temperature: float,
     ):
+        if self.is_chat_model:
+            raise NotImplementedError(
+                "select/choices is not supported for chat models. "
+                "Please try to use a non-chat model such as gpt-3.5-turbo-instruct"
+            )
+
         n_choices = len(choices)
         token_ids = [self.tokenizer.encode(x) for x in choices]
         scores = [0] * n_choices

python/sglang/lang/interpreter.py

@@ -197,16 +197,7 @@ class StreamExecutor:
             self.stream_var_event = None
 
     def submit(self, expr: SglExpr):
-        if isinstance(expr, (SglGen, SglSelect, SglVarScopeBegin)):
-            self.variable_event[expr.name] = threading.Event()
-            if self.stream:
-                self.stream_var_event[expr.name] = threading.Event()
-        elif isinstance(expr, SglExprList):
-            for e in expr.expr_list:
-                if isinstance(e, (SglGen, SglSelect, SglVarScopeBegin)):
-                    self.variable_event[e.name] = threading.Event()
-                    if self.stream:
-                        self.stream_var_event[e.name] = threading.Event()
+        self._init_var_event(expr)
 
         if self.use_thread:
             self.queue.put(expr)
@@ -467,6 +458,15 @@ class StreamExecutor:
         src_rids = [state.stream_executor.sid for state in expr.states]
         self.backend.concatenate_and_append(src_rids, self.sid)
 
+    def _init_var_event(self, expr):
+        if isinstance(expr, (SglGen, SglSelect, SglVarScopeBegin)):
+            self.variable_event[expr.name] = threading.Event()
+            if self.stream:
+                self.stream_var_event[expr.name] = threading.Event()
+        elif isinstance(expr, SglExprList):
+            for e in expr.expr_list:
+                self._init_var_event(e)
+
     def _resolve_sampling_params(self, sampling_params):
         clone = None
         for item in [