"""
A model worker executes the model.
"""
import argparse
import asyncio
import json
import time
import threading
import uuid
from fastapi import FastAPI, Request, BackgroundTasks
from fastapi.responses import StreamingResponse
import requests
import torch
import uvicorn
from functools import partial
from llava.constants import WORKER_HEART_BEAT_INTERVAL
from llava.utils import (build_logger, server_error_msg,
pretty_print_semaphore)
from llava.model.builder import load_pretrained_model
from llava.mm_utils import process_images, load_image_from_base64, tokenizer_image_token, KeywordsStoppingCriteria
from llava.constants import IMAGE_TOKEN_INDEX, DEFAULT_IMAGE_TOKEN, DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN
from transformers import TextIteratorStreamer
from threading import Thread
GB = 1 << 30
worker_id = str(uuid.uuid4())[:6]
logger = build_logger("model_worker", f"model_worker_{worker_id}.log")
global_counter = 0
model_semaphore = None
def heart_beat_worker(controller):
while True:
time.sleep(WORKER_HEART_BEAT_INTERVAL)
controller.send_heart_beat()
class ModelWorker:
def __init__(self, controller_addr, worker_addr,
worker_id, no_register,
model_path, model_base, model_name,
load_8bit, load_4bit, device):
self.controller_addr = controller_addr
self.worker_addr = worker_addr
self.worker_id = worker_id
if model_path.endswith("/"):
model_path = model_path[:-1]
if model_name is None:
model_paths = model_path.split("/")
if model_paths[-1].startswith('checkpoint-'):
self.model_name = model_paths[-2] + "_" + model_paths[-1]
else:
self.model_name = model_paths[-1]
else:
self.model_name = model_name
self.device = device
logger.info(f"Loading the model {self.model_name} on worker {worker_id} ...")
self.tokenizer, self.model, self.image_processor, self.context_len = load_pretrained_model(
model_path, model_base, self.model_name, load_8bit, load_4bit, device=self.device)
self.is_multimodal = 'llava' in self.model_name.lower()
if not no_register:
self.register_to_controller()
self.heart_beat_thread = threading.Thread(
target=heart_beat_worker, args=(self,))
self.heart_beat_thread.start()
def register_to_controller(self):
logger.info("Register to controller")
url = self.controller_addr + "/register_worker"
data = {
"worker_name": self.worker_addr,
"check_heart_beat": True,
"worker_status": self.get_status()
}
r = requests.post(url, json=data)
assert r.status_code == 200
def send_heart_beat(self):
logger.info(f"Send heart beat. Models: {[self.model_name]}. "
f"Semaphore: {pretty_print_semaphore(model_semaphore)}. "
f"global_counter: {global_counter}")
url = self.controller_addr + "/receive_heart_beat"
while True:
try:
ret = requests.post(url, json={
"worker_name": self.worker_addr,
"queue_length": self.get_queue_length()}, timeout=5)
exist = ret.json()["exist"]
break
except requests.exceptions.RequestException as e:
logger.error(f"heart beat error: {e}")
time.sleep(5)
if not exist:
self.register_to_controller()
def get_queue_length(self):
if model_semaphore is None:
return 0
else:
return args.limit_model_concurrency - model_semaphore._value + (len(
model_semaphore._waiters) if model_semaphore._waiters is not None else 0)
def get_status(self):
return {
"model_names": [self.model_name],
"speed": 1,
"queue_length": self.get_queue_length(),
}
@torch.inference_mode()
def generate_stream(self, params):
tokenizer, model, image_processor = self.tokenizer, self.model, self.image_processor
prompt = params["prompt"]
ori_prompt = prompt
images = params.get("images", None)
num_image_tokens = 0
if images is not None and len(images) > 0 and self.is_multimodal:
if len(images) > 0:
if len(images) != prompt.count(DEFAULT_IMAGE_TOKEN):
raise ValueError("Number of images does not match number of <image> tokens in prompt")
images = [load_image_from_base64(image) for image in images]
images = process_images(images, image_processor, model.config)
if type(images) is list:
images = [image.to(self.model.device, dtype=torch.float16) for image in images]
else:
images = images.to(self.model.device, dtype=torch.float16)
replace_token = DEFAULT_IMAGE_TOKEN
if getattr(self.model.config, 'mm_use_im_start_end', False):
replace_token = DEFAULT_IM_START_TOKEN + replace_token + DEFAULT_IM_END_TOKEN
prompt = prompt.replace(DEFAULT_IMAGE_TOKEN, replace_token)
num_image_tokens = prompt.count(replace_token) * model.get_vision_tower().num_patches
else:
images = None
image_args = {"images": images}
else:
images = None
image_args = {}
temperature = float(params.get("temperature", 1.0))
top_p = float(params.get("top_p", 1.0))
max_context_length = getattr(model.config, 'max_position_embeddings', 2048)
max_new_tokens = min(int(params.get("max_new_tokens", 256)), 1024)
stop_str = params.get("stop", None)
do_sample = True if temperature > 0.001 else False
input_ids = tokenizer_image_token(prompt, tokenizer, IMAGE_TOKEN_INDEX, return_tensors='pt').unsqueeze(0).to(self.device)
keywords = [stop_str]
stopping_criteria = KeywordsStoppingCriteria(keywords, tokenizer, input_ids)
streamer = TextIteratorStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True, timeout=15)
max_new_tokens = min(max_new_tokens, max_context_length - input_ids.shape[-1] - num_image_tokens)
if max_new_tokens < 1:
yield json.dumps({"text": ori_prompt + "Exceeds max token length. Please start a new conversation, thanks.", "error_code": 0}).encode() + b"\0"
return
thread = Thread(target=model.generate, kwargs=dict(
inputs=input_ids,
do_sample=do_sample,
temperature=temperature,
top_p=top_p,
max_new_tokens=max_new_tokens,
streamer=streamer,
stopping_criteria=[stopping_criteria],
use_cache=True,
**image_args
))
thread.start()
generated_text = ori_prompt
for new_text in streamer:
generated_text += new_text
if generated_text.endswith(stop_str):
generated_text = generated_text[:-len(stop_str)]
yield json.dumps({"text": generated_text, "error_code": 0}).encode() + b"\0"
def generate_stream_gate(self, params):
try:
for x in self.generate_stream(params):
yield x
except ValueError as e:
print("Caught ValueError:", e)
ret = {
"text": server_error_msg,
"error_code": 1,
}
yield json.dumps(ret).encode() + b"\0"
except torch.cuda.CudaError as e:
print("Caught torch.cuda.CudaError:", e)
ret = {
"text": server_error_msg,
"error_code": 1,
}
yield json.dumps(ret).encode() + b"\0"
except Exception as e:
print("Caught Unknown Error", e)
ret = {
"text": server_error_msg,
"error_code": 1,
}
yield json.dumps(ret).encode() + b"\0"
app = FastAPI()
def release_model_semaphore(fn=None):
model_semaphore.release()
if fn is not None:
fn()
@app.post("/worker_generate_stream")
async def generate_stream(request: Request):
global model_semaphore, global_counter
global_counter += 1
params = await request.json()
if model_semaphore is None:
model_semaphore = asyncio.Semaphore(args.limit_model_concurrency)
await model_semaphore.acquire()
worker.send_heart_beat()
generator = worker.generate_stream_gate(params)
background_tasks = BackgroundTasks()
background_tasks.add_task(partial(release_model_semaphore, fn=worker.send_heart_beat))
return StreamingResponse(generator, background=background_tasks)
@app.post("/worker_get_status")
async def get_status(request: Request):
return worker.get_status()
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("--host", type=str, default="localhost")
parser.add_argument("--port", type=int, default=21002)
parser.add_argument("--worker-address", type=str,
default="http://localhost:21002")
parser.add_argument("--controller-address", type=str,
default="http://localhost:21001")
parser.add_argument("--model-path", type=str, default="facebook/opt-350m")
parser.add_argument("--model-base", type=str, default=None)
parser.add_argument("--model-name", type=str)
parser.add_argument("--device", type=str, default="cuda")
parser.add_argument("--multi-modal", action="store_true", help="Multimodal mode is automatically detected with model name, please make sure `llava` is included in the model path.")
parser.add_argument("--limit-model-concurrency", type=int, default=5)
parser.add_argument("--stream-interval", type=int, default=1)
parser.add_argument("--no-register", action="store_true")
parser.add_argument("--load-8bit", action="store_true")
parser.add_argument("--load-4bit", action="store_true")
args = parser.parse_args()
logger.info(f"args: {args}")
if args.multi_modal:
logger.warning("Multimodal mode is automatically detected with model name, please make sure `llava` is included in the model path.")
worker = ModelWorker(args.controller_address,
args.worker_address,
worker_id,
args.no_register,
args.model_path,
args.model_base,
args.model_name,
args.load_8bit,
args.load_4bit,
args.device)
uvicorn.run(app, host=args.host, port=args.port, log_level="info")