From 0617528632fe266427e1ee6cf5037e3fca06e538 Mon Sep 17 00:00:00 2001
From: Lianmin Zheng <lianminzheng@gmail.com>
Date: Tue, 30 Jan 2024 04:29:32 -0800
Subject: [PATCH] Update quick start examples (#120)

---
 README.md                                     | 65 ++++++++--------
 .../quick_start/anthropic_example_chat.py     | 74 ++++++++++++++----
 .../quick_start/anthropic_example_complete.py | 57 ++++++++++++--
 .../quick_start/anthropic_example_stream.py   | 20 -----
 examples/quick_start/gemini_example_chat.py   | 67 ++++++++++++++++
 .../quick_start/gemini_example_complete.py    | 57 ++++++++++++--
 .../gemini_example_multimodal_chat.py         | 36 +++++----
 examples/quick_start/gemini_example_stream.py | 20 -----
 examples/quick_start/openai_example_chat.py   | 76 ++++++++++++++----
 .../quick_start/openai_example_complete.py    | 57 ++++++++++++--
 examples/quick_start/openai_example_stream.py | 21 -----
 examples/quick_start/srt_example_chat.py      | 77 +++++++++++++++----
 examples/quick_start/srt_example_complete.py  | 60 ++++++++++++---
 examples/quick_start/srt_example_llava.py     | 64 ++++++++++-----
 examples/quick_start/srt_example_stream.py    | 26 -------
 .../srt_example_regex.py                      |  0
 python/sglang/lang/interpreter.py             |  6 +-
 python/sglang/lang/ir.py                      |  4 +-
 python/sglang/srt/models/qwen2.py             |  3 +-
 python/sglang/srt/server.py                   | 14 +++-
 20 files changed, 567 insertions(+), 237 deletions(-)
 delete mode 100644 examples/quick_start/anthropic_example_stream.py
 create mode 100644 examples/quick_start/gemini_example_chat.py
 delete mode 100644 examples/quick_start/gemini_example_stream.py
 delete mode 100644 examples/quick_start/openai_example_stream.py
 delete mode 100644 examples/quick_start/srt_example_stream.py
 rename examples/{quick_start => usage}/srt_example_regex.py (100%)

diff --git a/README.md b/README.md
index ed1cf94eb..d5892f131 100644
--- a/README.md
+++ b/README.md
@@ -39,40 +39,10 @@ pip install -e "python[all]"
   - For NVIDIA V100, please install the [nightly](https://triton-lang.org/main/getting-started/installation.html) version.
 - If you only need to use the OpenAI backend, you can avoid installing other dependencies by using `pip install "sglang[openai]"`
 
+
 ## Quick Start
 The example below shows how to use sglang to answer a mulit-turn question.
 
-### Using OpenAI Models
-Set the OpenAI API Key
-```
-export OPENAI_API_KEY=sk-******
-```
-
-Then, answer a multi-turn question.
-```python
-from sglang import function, system, user, assistant, gen, set_default_backend, OpenAI
-
-@function
-def multi_turn_question(s, question_1, question_2):
-    s += system("You are a helpful assistant.")
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
-
-set_default_backend(OpenAI("gpt-3.5-turbo"))
-
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-)
-
-for m in state.messages():
-    print(m["role"], ":", m["content"])
-
-print(state["answer_1"])
-```
-
 ### Using Local Models
 First, launch a server with
 ```
@@ -105,6 +75,37 @@ for m in state.messages():
 print(state["answer_1"])
 ```
 
+### Using OpenAI Models
+Set the OpenAI API Key
+```
+export OPENAI_API_KEY=sk-******
+```
+
+Then, answer a multi-turn question.
+```python
+from sglang import function, system, user, assistant, gen, set_default_backend, OpenAI
+
+@function
+def multi_turn_question(s, question_1, question_2):
+    s += system("You are a helpful assistant.")
+    s += user(question_1)
+    s += assistant(gen("answer_1", max_tokens=256))
+    s += user(question_2)
+    s += assistant(gen("answer_2", max_tokens=256))
+
+set_default_backend(OpenAI("gpt-3.5-turbo"))
+
+state = multi_turn_question.run(
+    question_1="What is the capital of the United States?",
+    question_2="List two local attractions.",
+)
+
+for m in state.messages():
+    print(m["role"], ":", m["content"])
+
+print(state["answer_1"])
+```
+
 ### More Examples
 
 Anthropic and VertexAI (Gemini) models are also supported.
@@ -120,7 +121,7 @@ import sglang as sgl
 `sglang` provides some simple primitives such as `gen`, `select`, `fork`, `image`.
 You can implement your prompt flow in a function decorated by `sgl.function`.
 You can then invoke the function with `run` or `run_batch`.
-The system will manage the state, chat template, and parallelism for you.
+The system will manage the state, chat template, parallelism and batching for you.
 
 ### Control Flow
 You can use any Python code within the function body, including control flow, nested function calls, and external libraries.
diff --git a/examples/quick_start/anthropic_example_chat.py b/examples/quick_start/anthropic_example_chat.py
index 75e90ca5e..fe0b31a9b 100644
--- a/examples/quick_start/anthropic_example_chat.py
+++ b/examples/quick_start/anthropic_example_chat.py
@@ -1,19 +1,67 @@
-from sglang import function, system, user, assistant, gen, set_default_backend, Anthropic
+"""
+Usage:
+export ANTHROPIC_API_KEY=sk-******
+python3 anthropic_example_chat.py
+"""
+import sglang as sgl
 
 
-@function
+@sgl.function
 def multi_turn_question(s, question_1, question_2):
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
+    s += sgl.user(question_1)
+    s += sgl.assistant(sgl.gen("answer_1", max_tokens=256))
+    s += sgl.user(question_2)
+    s += sgl.assistant(sgl.gen("answer_2", max_tokens=256))
 
-set_default_backend(Anthropic("claude-2"))
 
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-)
+def single():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+    )
 
-for m in state.messages():
-    print(m["role"], ":", m["content"])
+    for m in state.messages():
+        print(m["role"], ":", m["content"])
+
+    print("answer_1", state["answer_1"])
+
+
+def stream():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+        stream=True
+    )
+
+    for out in state.text_iter():
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = multi_turn_question.run_batch([
+        {"question_1": "What is the capital of the United States?",
+         "question_2": "List two local attractions."},
+
+        {"question_1": "What is the capital of France?",
+         "question_2": "What is the population of this city?"},
+    ])
+
+    for s in states:
+        print(s.messages())
+
+
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.Anthropic("claude-2"))
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
diff --git a/examples/quick_start/anthropic_example_complete.py b/examples/quick_start/anthropic_example_complete.py
index 8648f2ff1..5a28a99c5 100644
--- a/examples/quick_start/anthropic_example_complete.py
+++ b/examples/quick_start/anthropic_example_complete.py
@@ -1,7 +1,13 @@
-from sglang import function, gen, set_default_backend, Anthropic
+"""
+Usage:
+export ANTHROPIC_API_KEY=sk-******
+python3 anthropic_example_complete.py
+"""
+
+import sglang as sgl
 
 
-@function
+@sgl.function
 def few_shot_qa(s, question):
     s += (
 """
@@ -13,14 +19,49 @@ def few_shot_qa(s, question):
 \n\nAssistant: Rome
 """)
     s += "\n\nHuman: " + question + "\n"
-    s += "\n\nAssistant:" + gen("answer", stop="\n", temperature=0)
+    s += "\n\nAssistant:" + sgl.gen("answer", stop="\n", temperature=0)
 
 
-set_default_backend(Anthropic("claude-2"))
+def single():
+    state = few_shot_qa.run(question="What is the capital of the United States?")
+    answer = state["answer"].strip().lower()
 
-state = few_shot_qa.run(question="What is the capital of the United States?")
-answer = state["answer"].strip().lower()
+    assert "washington" in answer, f"answer: {state['answer']}"
 
-assert "washington" in answer, f"answer: {state['answer']}"
+    print(state.text())
 
-print(state.text())
+
+def stream():
+    state = few_shot_qa.run(
+        question="What is the capital of the United States?",
+        stream=True)
+
+    for out in state.text_iter("answer"):
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = few_shot_qa.run_batch([
+        {"question": "What is the capital of the United States?"},
+        {"question": "What is the capital of China?"},
+    ])
+
+    for s in states:
+        print(s["answer"])
+
+
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.Anthropic("claude-2"))
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
diff --git a/examples/quick_start/anthropic_example_stream.py b/examples/quick_start/anthropic_example_stream.py
deleted file mode 100644
index e265e16c7..000000000
--- a/examples/quick_start/anthropic_example_stream.py
+++ /dev/null
@@ -1,20 +0,0 @@
-from sglang import function, system, user, assistant, gen, set_default_backend, Anthropic
-
-
-@function
-def multi_turn_question(s, question_1, question_2):
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
-
-set_default_backend(Anthropic("claude-2"))
-
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-    stream=True
-)
-
-for out in state.text_iter():
-    print(out, end="", flush=True)
diff --git a/examples/quick_start/gemini_example_chat.py b/examples/quick_start/gemini_example_chat.py
new file mode 100644
index 000000000..f7f70f499
--- /dev/null
+++ b/examples/quick_start/gemini_example_chat.py
@@ -0,0 +1,67 @@
+"""
+Usage:
+export GCP_PROJECT_ID=******
+python3 gemini_example_chat.py
+"""
+import sglang as sgl
+
+
+@sgl.function
+def multi_turn_question(s, question_1, question_2):
+    s += sgl.user(question_1)
+    s += sgl.assistant(sgl.gen("answer_1", max_tokens=256))
+    s += sgl.user(question_2)
+    s += sgl.assistant(sgl.gen("answer_2", max_tokens=256))
+
+
+def single():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+    )
+
+    for m in state.messages():
+        print(m["role"], ":", m["content"])
+
+    print("answer_1", state["answer_1"])
+
+
+def stream():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+        stream=True
+    )
+
+    for out in state.text_iter():
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = multi_turn_question.run_batch([
+        {"question_1": "What is the capital of the United States?",
+         "question_2": "List two local attractions."},
+
+        {"question_1": "What is the capital of France?",
+         "question_2": "What is the population of this city?"},
+    ])
+
+    for s in states:
+        print(s.messages())
+
+
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.VertexAI("gemini-pro"))
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
diff --git a/examples/quick_start/gemini_example_complete.py b/examples/quick_start/gemini_example_complete.py
index abaaec7c9..255a3ad4c 100644
--- a/examples/quick_start/gemini_example_complete.py
+++ b/examples/quick_start/gemini_example_complete.py
@@ -1,7 +1,13 @@
-from sglang import function, gen, set_default_backend, VertexAI
+"""
+Usage:
+export GCP_PROJECT_ID=******
+python3 gemini_example_complete.py
+"""
+
+import sglang as sgl
 
 
-@function
+@sgl.function
 def few_shot_qa(s, question):
     s += (
 """The following are questions with answers.
@@ -13,14 +19,49 @@ Q: What is the capital of Italy?
 A: Rome
 """)
     s += "Q: " + question + "\n"
-    s += "A:" + gen("answer", stop="\n", temperature=0)
+    s += "A:" + sgl.gen("answer", stop="\n", temperature=0)
 
 
-set_default_backend(VertexAI("gemini-pro"))
+def single():
+    state = few_shot_qa.run(question="What is the capital of the United States?")
+    answer = state["answer"].strip().lower()
 
-state = few_shot_qa.run(question="What is the capital of the United States?")
-answer = state["answer"].strip().lower()
+    assert "washington" in answer, f"answer: {state['answer']}"
 
-assert "washington" in answer, f"answer: {state['answer']}"
+    print(state.text())
 
-print(state.text())
+
+def stream():
+    state = few_shot_qa.run(
+        question="What is the capital of the United States?",
+        stream=True)
+
+    for out in state.text_iter("answer"):
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = few_shot_qa.run_batch([
+        {"question": "What is the capital of the United States?"},
+        {"question": "What is the capital of China?"},
+    ])
+
+    for s in states:
+        print(s["answer"])
+
+
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.VertexAI("gemini-pro"))
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
diff --git a/examples/quick_start/gemini_example_multimodal_chat.py b/examples/quick_start/gemini_example_multimodal_chat.py
index ac5409a4e..fa5e6e8b7 100644
--- a/examples/quick_start/gemini_example_multimodal_chat.py
+++ b/examples/quick_start/gemini_example_multimodal_chat.py
@@ -1,19 +1,29 @@
-from sglang import function, user, assistant, gen, image, set_default_backend, VertexAI
+"""
+Usage:
+export GCP_PROJECT_ID=******
+python3 gemini_example_multimodal_chat.py
+"""
+import sglang as sgl
 
 
-@function
+@sgl.function
 def image_qa(s, image_file1, image_file2, question):
-    s += user(image(image_file1) + image(image_file2) + question)
-    s += assistant(gen("answer_1", max_tokens=256))
+    s += sgl.user(sgl.image(image_file1) + sgl.image(image_file2) + question)
+    s += sgl.assistant(sgl.gen("answer", max_tokens=256))
 
-set_default_backend(VertexAI("gemini-pro-vision"))
 
-state = image_qa.run(
-    image_file1="./images/cat.jpeg",
-    image_file2="./images/dog.jpeg",
-    question="Describe difference of the 2 images in one sentence.",
-    stream=True
-)
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.VertexAI("gemini-pro-vision"))
 
-for out in state.text_iter():
-    print(out, end="", flush=True)
+    state = image_qa.run(
+        image_file1="./images/cat.jpeg",
+        image_file2="./images/dog.jpeg",
+        question="Describe difference of the two images in one sentence.",
+        stream=True
+    )
+
+    for out in state.text_iter("answer"):
+        print(out, end="", flush=True)
+    print()
+
+    print(state["answer"])
diff --git a/examples/quick_start/gemini_example_stream.py b/examples/quick_start/gemini_example_stream.py
deleted file mode 100644
index 431e7115d..000000000
--- a/examples/quick_start/gemini_example_stream.py
+++ /dev/null
@@ -1,20 +0,0 @@
-from sglang import function, user, assistant, gen, set_default_backend, VertexAI
-
-
-@function
-def multi_turn_question(s, question_1, question_2):
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
-
-set_default_backend(VertexAI("gemini-pro"))
-
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-    stream=True
-)
-
-for out in state.text_iter():
-    print(out, end="", flush=True)
diff --git a/examples/quick_start/openai_example_chat.py b/examples/quick_start/openai_example_chat.py
index bdd5b171c..591cd178a 100644
--- a/examples/quick_start/openai_example_chat.py
+++ b/examples/quick_start/openai_example_chat.py
@@ -1,20 +1,68 @@
-from sglang import function, system, user, assistant, gen, set_default_backend, OpenAI
+"""
+Usage:
+export OPENAI_API_KEY=sk-******
+python3 openai_example_chat.py
+"""
+import sglang as sgl
 
 
-@function
+@sgl.function
 def multi_turn_question(s, question_1, question_2):
-    s += system("You are a helpful assistant.")
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
+    s += sgl.system("You are a helpful assistant.")
+    s += sgl.user(question_1)
+    s += sgl.assistant(sgl.gen("answer_1", max_tokens=256))
+    s += sgl.user(question_2)
+    s += sgl.assistant(sgl.gen("answer_2", max_tokens=256))
 
-set_default_backend(OpenAI("gpt-3.5-turbo"))
 
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-)
+def single():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+    )
 
-for m in state.messages():
-    print(m["role"], ":", m["content"])
+    for m in state.messages():
+        print(m["role"], ":", m["content"])
+
+    print("answer_1", state["answer_1"])
+
+
+def stream():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+        stream=True
+    )
+
+    for out in state.text_iter():
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = multi_turn_question.run_batch([
+        {"question_1": "What is the capital of the United States?",
+         "question_2": "List two local attractions."},
+
+        {"question_1": "What is the capital of France?",
+         "question_2": "What is the population of this city?"},
+    ])
+
+    for s in states:
+        print(s.messages())
+
+
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.OpenAI("gpt-3.5-turbo"))
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
diff --git a/examples/quick_start/openai_example_complete.py b/examples/quick_start/openai_example_complete.py
index fd74fba69..41b3c9904 100644
--- a/examples/quick_start/openai_example_complete.py
+++ b/examples/quick_start/openai_example_complete.py
@@ -1,7 +1,13 @@
-from sglang import function, gen, set_default_backend, OpenAI
+"""
+Usage:
+export OPENAI_API_KEY=sk-******
+python3 openai_example_complete.py
+"""
+
+import sglang as sgl
 
 
-@function
+@sgl.function
 def few_shot_qa(s, question):
     s += (
 """The following are questions with answers.
@@ -13,14 +19,49 @@ Q: What is the capital of Italy?
 A: Rome
 """)
     s += "Q: " + question + "\n"
-    s += "A:" + gen("answer", stop="\n", temperature=0)
+    s += "A:" + sgl.gen("answer", stop="\n", temperature=0)
 
 
-set_default_backend(OpenAI("gpt-3.5-turbo-instruct"))
+def single():
+    state = few_shot_qa.run(question="What is the capital of the United States?")
+    answer = state["answer"].strip().lower()
 
-state = few_shot_qa.run(question="What is the capital of the United States?")
-answer = state["answer"].strip().lower()
+    assert "washington" in answer, f"answer: {state['answer']}"
 
-assert "washington" in answer, f"answer: {state['answer']}"
+    print(state.text())
 
-print(state.text())
+
+def stream():
+    state = few_shot_qa.run(
+        question="What is the capital of the United States?",
+        stream=True)
+
+    for out in state.text_iter("answer"):
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = few_shot_qa.run_batch([
+        {"question": "What is the capital of the United States?"},
+        {"question": "What is the capital of China?"},
+    ])
+
+    for s in states:
+        print(s["answer"])
+
+
+if __name__ == "__main__":
+    sgl.set_default_backend(sgl.OpenAI("gpt-3.5-turbo-instruct"))
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
diff --git a/examples/quick_start/openai_example_stream.py b/examples/quick_start/openai_example_stream.py
deleted file mode 100644
index 0ed010701..000000000
--- a/examples/quick_start/openai_example_stream.py
+++ /dev/null
@@ -1,21 +0,0 @@
-from sglang import function, system, user, assistant, gen, set_default_backend, OpenAI
-
-
-@function
-def multi_turn_question(s, question_1, question_2):
-    s += system("You are a helpful assistant.")
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
-
-set_default_backend(OpenAI("gpt-3.5-turbo"))
-
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-    stream=True
-)
-
-for out in state.text_iter():
-    print(out, end="", flush=True)
diff --git a/examples/quick_start/srt_example_chat.py b/examples/quick_start/srt_example_chat.py
index a5130dca3..657c19c91 100644
--- a/examples/quick_start/srt_example_chat.py
+++ b/examples/quick_start/srt_example_chat.py
@@ -1,26 +1,69 @@
-from sglang import function, system, user, assistant, gen, set_default_backend, Runtime
+"""
+Usage:
+python3 srt_example_chat.py
+"""
+import sglang as sgl
 
 
-@function
+@sgl.function
 def multi_turn_question(s, question_1, question_2):
-    s += system("You are a helpful assistant.")
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
+    s += sgl.user(question_1)
+    s += sgl.assistant(sgl.gen("answer_1", max_tokens=256))
+    s += sgl.user(question_2)
+    s += sgl.assistant(sgl.gen("answer_2", max_tokens=256))
 
 
-runtime = Runtime(model_path="meta-llama/Llama-2-7b-chat-hf")
-#runtime = Runtime(model_path="mistralai/Mixtral-8x7B-Instruct-v0.1")
-set_default_backend(runtime)
+def single():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+    )
 
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-)
+    for m in state.messages():
+        print(m["role"], ":", m["content"])
 
-for m in state.messages():
-    print(m["role"], ":", m["content"])
+    print("answer_1", state["answer_1"])
 
 
-runtime.shutdown()
+def stream():
+    state = multi_turn_question.run(
+        question_1="What is the capital of the United States?",
+        question_2="List two local attractions.",
+        stream=True
+    )
+
+    for out in state.text_iter():
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = multi_turn_question.run_batch([
+        {"question_1": "What is the capital of the United States?",
+         "question_2": "List two local attractions."},
+
+        {"question_1": "What is the capital of France?",
+         "question_2": "What is the population of this city?"},
+    ])
+
+    for s in states:
+        print(s.messages())
+
+
+if __name__ == "__main__":
+    runtime = sgl.Runtime(model_path="meta-llama/Llama-2-7b-chat-hf")
+    sgl.set_default_backend(runtime)
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
+
+    runtime.shutdown()
diff --git a/examples/quick_start/srt_example_complete.py b/examples/quick_start/srt_example_complete.py
index 61e2facbf..200891670 100644
--- a/examples/quick_start/srt_example_complete.py
+++ b/examples/quick_start/srt_example_complete.py
@@ -1,7 +1,11 @@
-from sglang import function, gen, set_default_backend, Runtime
+"""
+Usage:
+python3 srt_example_complete.py
+"""
+import sglang as sgl
 
 
-@function
+@sgl.function
 def few_shot_qa(s, question):
     s += (
 """The following are questions with answers.
@@ -13,16 +17,52 @@ Q: What is the capital of Italy?
 A: Rome
 """)
     s += "Q: " + question + "\n"
-    s += "A:" + gen("answer", stop="\n", temperature=0)
+    s += "A:" + sgl.gen("answer", stop="\n", temperature=0)
 
 
-runtime = Runtime(model_path="meta-llama/Llama-2-7b-chat-hf")
-set_default_backend(runtime)
+def single():
+    state = few_shot_qa.run(question="What is the capital of the United States?")
+    answer = state["answer"].strip().lower()
 
-state = few_shot_qa.run(question="What is the capital of the United States?")
+    assert "washington" in answer, f"answer: {state['answer']}"
 
-answer = state["answer"].strip().lower()
-assert "washington" in answer, f"answer: {state['answer']}"
-print(state.text())
+    print(state.text())
 
-runtime.shutdown()
+
+def stream():
+    state = few_shot_qa.run(
+        question="What is the capital of the United States?",
+        stream=True)
+
+    for out in state.text_iter("answer"):
+        print(out, end="", flush=True)
+    print()
+
+
+def batch():
+    states = few_shot_qa.run_batch([
+        {"question": "What is the capital of the United States?"},
+        {"question": "What is the capital of China?"},
+    ])
+
+    for s in states:
+        print(s["answer"])
+
+
+if __name__ == "__main__":
+    runtime = sgl.Runtime(model_path="meta-llama/Llama-2-7b-chat-hf")
+    sgl.set_default_backend(runtime)
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
+
+    runtime.shutdown()
diff --git a/examples/quick_start/srt_example_llava.py b/examples/quick_start/srt_example_llava.py
index 2f4c7b02a..f374d0a0f 100644
--- a/examples/quick_start/srt_example_llava.py
+++ b/examples/quick_start/srt_example_llava.py
@@ -10,29 +10,53 @@ def image_qa(s, image_path, question):
     s += sgl.assistant(sgl.gen("answer"))
 
 
-runtime = sgl.Runtime(model_path="liuhaotian/llava-v1.5-7b",
-                      tokenizer_path="llava-hf/llava-1.5-7b-hf")
-sgl.set_default_backend(runtime)
+def single():
+    state = image_qa.run(
+        image_path="images/cat.jpeg",
+        question="What is this?",
+        max_new_tokens=64)
+    print(state["answer"], "\n")
 
 
-# Single
-state = image_qa.run(
-    image_path="images/cat.jpeg",
-    question="What is this?",
-    max_new_tokens=64)
-print(state["answer"], "\n")
+def stream():
+    state = image_qa.run(
+        image_path="images/cat.jpeg",
+        question="What is this?",
+        max_new_tokens=64,
+        stream=True)
+
+    for out in state.text_iter("answer"):
+        print(out, end="", flush=True)
+    print()
 
 
-# Batch
-states = image_qa.run_batch(
-    [
-        {"image_path": "images/cat.jpeg", "question":"What is this?"},
-        {"image_path": "images/dog.jpeg", "question":"What is this?"},
-    ],
-    max_new_tokens=64,
-)
-for s in states:
-    print(s["answer"], "\n")
+def batch():
+    states = image_qa.run_batch(
+        [
+            {"image_path": "images/cat.jpeg", "question":"What is this?"},
+            {"image_path": "images/dog.jpeg", "question":"What is this?"},
+        ],
+        max_new_tokens=64,
+    )
+    for s in states:
+        print(s["answer"], "\n")
 
 
-runtime.shutdown()
+if __name__ == "__main__":
+    runtime = sgl.Runtime(model_path="liuhaotian/llava-v1.5-7b",
+                          tokenizer_path="llava-hf/llava-1.5-7b-hf")
+    sgl.set_default_backend(runtime)
+
+    # Run a single request
+    print("\n========== single ==========\n")
+    single()
+
+    # Stream output
+    print("\n========== stream ==========\n")
+    stream()
+
+    # Run a batch of requests
+    print("\n========== batch ==========\n")
+    batch()
+
+    runtime.shutdown()
diff --git a/examples/quick_start/srt_example_stream.py b/examples/quick_start/srt_example_stream.py
deleted file mode 100644
index 8f03bd146..000000000
--- a/examples/quick_start/srt_example_stream.py
+++ /dev/null
@@ -1,26 +0,0 @@
-from sglang import function, system, user, assistant, gen, set_default_backend, Runtime
-
-
-@function
-def multi_turn_question(s, question_1, question_2):
-    s += system("You are a helpful assistant.")
-    s += user(question_1)
-    s += assistant(gen("answer_1", max_tokens=256))
-    s += user(question_2)
-    s += assistant(gen("answer_2", max_tokens=256))
-
-runtime = Runtime("meta-llama/Llama-2-7b-chat-hf")
-set_default_backend(runtime)
-
-state = multi_turn_question.run(
-    question_1="What is the capital of the United States?",
-    question_2="List two local attractions.",
-    temperature=0,
-    stream=True,
-)
-
-for out in state.text_iter():
-    print(out, end="", flush=True)
-print()
-
-runtime.shutdown()
diff --git a/examples/quick_start/srt_example_regex.py b/examples/usage/srt_example_regex.py
similarity index 100%
rename from examples/quick_start/srt_example_regex.py
rename to examples/usage/srt_example_regex.py
diff --git a/python/sglang/lang/interpreter.py b/python/sglang/lang/interpreter.py
index f281b0b2a..48fbbac31 100644
--- a/python/sglang/lang/interpreter.py
+++ b/python/sglang/lang/interpreter.py
@@ -651,7 +651,7 @@ class ProgramState:
     def sync(self):
         return self.stream_executor.sync()
 
-    def text_iter(self, var_name=None):
+    def text_iter(self, var_name: Optional[str] = None):
         if self.stream_executor.stream:
             prev = 0
             if var_name is None:
@@ -682,7 +682,9 @@ class ProgramState:
             else:
                 yield self.get_var(name)
 
-    async def text_async_iter(self, var_name=None, return_meta_data=False):
+    async def text_async_iter(
+        self, var_name: Optional[str] = None, return_meta_data: bool = False
+    ):
         loop = asyncio.get_running_loop()
 
         if self.stream_executor.stream:
diff --git a/python/sglang/lang/ir.py b/python/sglang/lang/ir.py
index 2803de51d..85f6f3f29 100644
--- a/python/sglang/lang/ir.py
+++ b/python/sglang/lang/ir.py
@@ -74,7 +74,9 @@ class SglSamplingParams:
             )
         return {
             "max_tokens_to_sample": self.max_new_tokens,
-            "stop_sequences": self.stop,
+            "stop_sequences": self.stop
+            if isinstance(self.stop, (list, tuple))
+            else [self.stop],
             "temperature": self.temperature,
             "top_p": self.top_p,
             "top_k": self.top_k,
diff --git a/python/sglang/srt/models/qwen2.py b/python/sglang/srt/models/qwen2.py
index e4dabfe30..e77d4082e 100644
--- a/python/sglang/srt/models/qwen2.py
+++ b/python/sglang/srt/models/qwen2.py
@@ -8,7 +8,6 @@ from sglang.srt.layers.logits_processor import LogitsProcessor
 from sglang.srt.layers.radix_attention import RadixAttention
 from sglang.srt.managers.router.model_runner import InputMetadata
 from torch import nn
-from transformers import Qwen2Config
 from vllm.model_executor.layers.activation import SiluAndMul
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.linear import (
@@ -30,6 +29,8 @@ from vllm.model_executor.weight_utils import (
     hf_model_weights_iterator,
 )
 
+Qwen2Config = None
+
 
 class Qwen2MLP(nn.Module):
     def __init__(
diff --git a/python/sglang/srt/server.py b/python/sglang/srt/server.py
index 9750c4e72..06d1b3def 100644
--- a/python/sglang/srt/server.py
+++ b/python/sglang/srt/server.py
@@ -445,18 +445,26 @@ class Runtime:
         pipe_reader, pipe_writer = mp.Pipe(duplex=False)
         proc = mp.Process(target=launch_server, args=(self.server_args, pipe_writer))
         proc.start()
+        pipe_writer.close()
         self.pid = proc.pid
 
-        init_state = pipe_reader.recv()
+        try:
+            init_state = pipe_reader.recv()
+        except EOFError:
+            init_state = ""
+
         if init_state != "init ok":
             self.shutdown()
-            raise RuntimeError("Launch failed")
+            raise RuntimeError("Launch failed. Please see the error messages above.")
 
         self.endpoint = RuntimeEndpoint(self.url)
 
     def shutdown(self):
         if self.pid is not None:
-            parent = psutil.Process(self.pid)
+            try:
+                parent = psutil.Process(self.pid)
+            except psutil.NoSuchProcess:
+                return
             children = parent.children(recursive=True)
             for child in children:
                 child.kill()