Add run_inference_server.py for Running llama.cpp Built-in Server (#204)

* Update CMakeLists.txt

I added a CMake option to compile the Llama.cpp server. This update allows us to easily build and deploy the server using BitNet

* Create run_inference_server.py

same as run_inference, but for use with llama.cpp's built in server, for some extra comfort

In particular:
- The build directory is determined based on whether the system is running on Windows or not.
- A list of arguments (`--model`, `-m` etc.) is created.
- The main argument list is parsed and passed to the `subprocess.run()` method to execute the system command.

CMakeLists.txt

@@ -39,6 +39,7 @@ endif()
 find_package(Threads REQUIRED)
 
 add_subdirectory(src)
+set(LLAMA_BUILD_SERVER ON CACHE BOOL "Build llama.cpp server" FORCE)
 add_subdirectory(3rdparty/llama.cpp)
 
 # install
@@ -74,4 +75,4 @@ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/LlamaConfig.cmake
         DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/Llama)
 
 set_target_properties(llama PROPERTIES PUBLIC_HEADER ${CMAKE_CURRENT_SOURCE_DIR}/llama.h)
-install(TARGETS llama LIBRARY PUBLIC_HEADER)
+install(TARGETS llama LIBRARY PUBLIC_HEADER)

run_inference_server.py

@@ -0,0 +1,64 @@
+import os
+import sys
+import signal
+import platform
+import argparse
+import subprocess
+
+def run_command(command, shell=False):
+    """Run a system command and ensure it succeeds."""
+    try:
+        subprocess.run(command, shell=shell, check=True)
+    except subprocess.CalledProcessError as e:
+        print(f"Error occurred while running command: {e}")
+        sys.exit(1)
+
+def run_server():
+    build_dir = "build"
+    if platform.system() == "Windows":
+        server_path = os.path.join(build_dir, "bin", "Release", "llama-server.exe")
+        if not os.path.exists(server_path):
+            server_path = os.path.join(build_dir, "bin", "llama-server")
+    else:
+        server_path = os.path.join(build_dir, "bin", "llama-server")
+    
+    command = [
+        f'{server_path}',
+        '-m', args.model,
+        '-c', str(args.ctx_size),
+        '-t', str(args.threads),
+        '-n', str(args.n_predict),
+        '-ngl', '0',
+        '--temp', str(args.temperature),
+        '--host', args.host,
+        '--port', str(args.port),
+        '-cb'  # Enable continuous batching
+    ]
+    
+    if args.prompt:
+        command.extend(['-p', args.prompt])
+    
+    # Note: -cnv flag is removed as it's not supported by the server
+    
+    print(f"Starting server on {args.host}:{args.port}")
+    run_command(command)
+
+def signal_handler(sig, frame):
+    print("Ctrl+C pressed, shutting down server...")
+    sys.exit(0)
+
+if __name__ == "__main__":
+    signal.signal(signal.SIGINT, signal_handler)
+    
+    parser = argparse.ArgumentParser(description='Run llama.cpp server')
+    parser.add_argument("-m", "--model", type=str, help="Path to model file", required=False, default="models/bitnet_b1_58-3B/ggml-model-i2_s.gguf")
+    parser.add_argument("-p", "--prompt", type=str, help="System prompt for the model", required=False)
+    parser.add_argument("-n", "--n-predict", type=int, help="Number of tokens to predict", required=False, default=4096)
+    parser.add_argument("-t", "--threads", type=int, help="Number of threads to use", required=False, default=2)
+    parser.add_argument("-c", "--ctx-size", type=int, help="Size of the context window", required=False, default=2048)
+    parser.add_argument("--temperature", type=float, help="Temperature for sampling", required=False, default=0.8)
+    parser.add_argument("--host", type=str, help="IP address to listen on", required=False, default="127.0.0.1")
+    parser.add_argument("--port", type=int, help="Port to listen on", required=False, default=8080)
+    
+    args = parser.parse_args()
+    run_server()