inference: Add model option to client (#170)

I was running this client for testing purposes and being able to
specify which model to use is a convenient addition. This change makes
that possible.

llama_stack/apis/inference/client.py

@@ -6,6 +6,7 @@
 
 import asyncio
 import json
+import sys
 from typing import Any, AsyncGenerator, List, Optional
 
 import fire
@@ -100,15 +101,18 @@ class InferenceClient(Inference):
                             print(f"Error with parsing or validation: {e}")
 
 
-async def run_main(host: str, port: int, stream: bool):
+async def run_main(host: str, port: int, stream: bool, model: Optional[str]):
     client = InferenceClient(f"http://{host}:{port}")
 
+    if not model:
+        model = "Llama3.1-8B-Instruct"
+
     message = UserMessage(
         content="hello world, write me a 2 sentence poem about the moon"
     )
     cprint(f"User>{message.content}", "green")
     iterator = client.chat_completion(
-        model="Llama3.1-8B-Instruct",
+        model=model,
         messages=[message],
         stream=stream,
     )
@@ -116,9 +120,14 @@ async def run_main(host: str, port: int, stream: bool):
         log.print()
 
 
-async def run_mm_main(host: str, port: int, stream: bool, path: str):
+async def run_mm_main(
+    host: str, port: int, stream: bool, path: Optional[str], model: Optional[str]
+):
     client = InferenceClient(f"http://{host}:{port}")
 
+    if not model:
+        model = "Llama3.2-11B-Vision-Instruct"
+
     message = UserMessage(
         content=[
             ImageMedia(image=URL(uri=f"file://{path}")),
@@ -127,7 +136,7 @@ async def run_mm_main(host: str, port: int, stream: bool, path: str):
     )
     cprint(f"User>{message.content}", "green")
     iterator = client.chat_completion(
-        model="Llama3.2-11B-Vision-Instruct",
+        model=model,
         messages=[message],
         stream=stream,
     )
@@ -135,11 +144,18 @@ async def run_mm_main(host: str, port: int, stream: bool, path: str):
         log.print()
 
 
-def main(host: str, port: int, stream: bool = True, mm: bool = False, file: str = None):
+def main(
+    host: str,
+    port: int,
+    stream: bool = True,
+    mm: bool = False,
+    file: Optional[str] = None,
+    model: Optional[str] = None,
+):
     if mm:
-        asyncio.run(run_mm_main(host, port, stream, file))
+        asyncio.run(run_mm_main(host, port, stream, file, model))
     else:
-        asyncio.run(run_main(host, port, stream))
+        asyncio.run(run_main(host, port, stream, model))
 
 
 if __name__ == "__main__":