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""" |
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A model worker executes the model. |
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""" |
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import argparse |
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import asyncio |
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import json |
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import time |
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import threading |
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import uuid |
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import requests |
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import torch |
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from functools import partial |
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from mplug_owl2.constants import WORKER_HEART_BEAT_INTERVAL |
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from mplug_owl2.utils import (build_logger, server_error_msg, |
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pretty_print_semaphore) |
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from mplug_owl2.model.builder import load_pretrained_model |
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from mplug_owl2.mm_utils import process_images, load_image_from_base64, tokenizer_image_token, KeywordsStoppingCriteria |
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from mplug_owl2.constants import IMAGE_TOKEN_INDEX, DEFAULT_IMAGE_TOKEN |
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from transformers import TextIteratorStreamer |
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from threading import Thread |
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GB = 1 << 30 |
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worker_id = str(uuid.uuid4())[:6] |
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logger = build_logger("model_worker", f"model_worker_{worker_id}.log") |
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class ModelWorker: |
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def __init__(self, model_path, model_base, model_name, load_8bit, load_4bit, device): |
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self.worker_id = worker_id |
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if model_path.endswith("/"): |
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model_path = model_path[:-1] |
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if model_name is None: |
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model_paths = model_path.split("/") |
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if model_paths[-1].startswith('checkpoint-'): |
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self.model_name = model_paths[-2] + "_" + model_paths[-1] |
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else: |
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self.model_name = model_paths[-1] |
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else: |
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self.model_name = model_name |
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self.device = device |
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logger.info(f"Loading the model {self.model_name} on worker {worker_id} ...") |
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self.tokenizer, self.model, self.image_processor, self.context_len = load_pretrained_model( |
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model_path, model_base, self.model_name, load_8bit, load_4bit, device=self.device) |
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self.is_multimodal = True |
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@torch.inference_mode() |
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def generate_stream(self, params): |
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tokenizer, model, image_processor = self.tokenizer, self.model, self.image_processor |
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prompt = params["prompt"] |
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ori_prompt = prompt |
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images = params.get("images", None) |
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num_image_tokens = 0 |
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if images is not None and len(images) > 0 and self.is_multimodal: |
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if len(images) > 0: |
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if len(images) != prompt.count(DEFAULT_IMAGE_TOKEN): |
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raise ValueError("Number of images does not match number of <|image|> tokens in prompt") |
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images = [load_image_from_base64(image) for image in images] |
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images = process_images(images, image_processor, model.config) |
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if type(images) is list: |
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images = [image.to(self.model.device, dtype=torch.float16) for image in images] |
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else: |
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images = images.to(self.model.device, dtype=torch.float16) |
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replace_token = DEFAULT_IMAGE_TOKEN |
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prompt = prompt.replace(DEFAULT_IMAGE_TOKEN, replace_token) |
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num_image_tokens = prompt.count(replace_token) * (model.get_model().visual_abstractor.config.num_learnable_queries + 1) |
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else: |
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images = None |
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image_args = {"images": images} |
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else: |
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images = None |
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image_args = {} |
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temperature = float(params.get("temperature", 1.0)) |
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top_p = float(params.get("top_p", 1.0)) |
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max_context_length = getattr(model.config, 'max_position_embeddings', 4096) |
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max_new_tokens = min(int(params.get("max_new_tokens", 256)), 1024) |
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stop_str = params.get("stop", None) |
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do_sample = True if temperature > 0.001 else False |
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input_ids = tokenizer_image_token(prompt, tokenizer, IMAGE_TOKEN_INDEX, return_tensors='pt').unsqueeze(0).to(self.device) |
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keywords = [stop_str] |
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stopping_criteria = KeywordsStoppingCriteria(keywords, tokenizer, input_ids) |
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streamer = TextIteratorStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True, timeout=15) |
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max_new_tokens = min(max_new_tokens, max_context_length - input_ids.shape[-1] - num_image_tokens) |
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if max_new_tokens < 1: |
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yield json.dumps({"text": ori_prompt + "Exceeds max token length. Please start a new conversation, thanks.", "error_code": 0}).encode() + b"\0" |
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return |
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thread = Thread(target=model.generate, kwargs=dict( |
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inputs=input_ids, |
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do_sample=do_sample, |
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temperature=temperature, |
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top_p=top_p, |
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max_new_tokens=max_new_tokens, |
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streamer=streamer, |
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stopping_criteria=[stopping_criteria], |
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use_cache=True, |
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**image_args |
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)) |
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thread.start() |
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generated_text = ori_prompt |
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for new_text in streamer: |
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generated_text += new_text |
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if generated_text.endswith(stop_str): |
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generated_text = generated_text[:-len(stop_str)] |
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yield json.dumps({"text": generated_text, "error_code": 0}).encode() |
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def generate_stream_gate(self, params): |
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try: |
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for x in self.generate_stream(params): |
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yield x |
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except ValueError as e: |
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print("Caught ValueError:", e) |
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ret = { |
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"text": server_error_msg, |
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"error_code": 1, |
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} |
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yield json.dumps(ret).encode() |
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except torch.cuda.CudaError as e: |
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print("Caught torch.cuda.CudaError:", e) |
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ret = { |
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"text": server_error_msg, |
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"error_code": 1, |
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} |
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yield json.dumps(ret).encode() |
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except Exception as e: |
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print("Caught Unknown Error", e) |
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ret = { |
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"text": server_error_msg, |
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"error_code": 1, |
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} |
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yield json.dumps(ret).encode() |