qwen2 VL 多模态图文模型；图像、视频使用案例

参考：
https://huggingface.co/Qwen/Qwen2-VL-2B-Instruct

模型：

export HF_ENDPOINT=https://hf-mirror.comhuggingface-cli download --resume-download --local-dir-use-symlinks False Qwen/Qwen2-VL-2B-Instruct  --local-dir qwen2-vl

安装：
transformers-4.45.0.dev0
accelerate-0.34.2 safetensors-0.4.5

pip install git+https://github.com/huggingface/transformers
pip install 'accelerate>=0.26.0'

代码：

单张图片

from PIL import Image
import requests
import torch
from torchvision import io
from typing import Dict
from transformers import Qwen2VLForConditionalGeneration, AutoTokenizer, AutoProcessor# Load the model in half-precision on the available device(s)
model = Qwen2VLForConditionalGeneration.from_pretrained("/ai/qwen2-vl", torch_dtype="auto", device_map="auto"
)
processor = AutoProcessor.from_pretrained("/ai/qwen2-vl")# Image
url = "https://qianwen-res.oss-cn-beijing.aliyuncs.com/Qwen-VL/assets/demo.jpeg"
image = Image.open(requests.get(url, stream=True).raw)conversation = [{"role": "user","content": [{"type": "image",},{"type": "text", "text": "Describe this image."},],}
]# Preprocess the inputs
text_prompt = processor.apply_chat_template(conversation, add_generation_prompt=True)
# Excepted output: '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n<|im_start|>user\n<|vision_start|><|image_pad|><|vision_end|>Describe this image.<|im_end|>\n<|im_start|>assistant\n'inputs = processor(text=[text_prompt], images=[image], padding=True, return_tensors="pt"
)
inputs = inputs.to("cuda")# Inference: Generation of the output
output_ids = model.generate(**inputs, max_new_tokens=128)
generated_ids = [output_ids[len(input_ids) :]for input_ids, output_ids in zip(inputs.input_ids, output_ids)
]
output_text = processor.batch_decode(generated_ids, skip_special_tokens=True, clean_up_tokenization_spaces=True
)
print(output_text)

这是图片：

中文问

# Image
url = "https://qianwen-res.oss-cn-beijing.aliyuncs.com/Qwen-VL/assets/demo.jpeg"
image = Image.open(requests.get(url, stream=True).raw)conversation = [{"role": "user","content": [{"type": "image",},{"type": "text", "text": "描述下这张图片."},],}
]# Preprocess the inputs
text_prompt = processor.apply_chat_template(conversation, add_generation_prompt=True)
# Excepted output: '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n<|im_start|>user\n<|vision_start|><|image_pad|><|vision_end|>Describe this image.<|im_end|>\n<|im_start|>assistant\n'inputs = processor(text=[text_prompt], images=[image], padding=True, return_tensors="pt"
)
inputs = inputs.to("cuda")
# Inference: Generation of the output
output_ids = model.generate(**inputs, max_new_tokens=128)
generated_ids = [output_ids[len(input_ids) :]for input_ids, output_ids in zip(inputs.input_ids, output_ids)
]
output_text = processor.batch_decode(generated_ids, skip_special_tokens=True, clean_up_tokenization_spaces=True
)
print(output_text)

多张图片

def load_images(image_info):images = []for info in image_info:if "image" in info:if info["image"].startswith("http"):image = Image.open(requests.get(info["image"], stream=True).raw)else:image = Image.open(info["image"])images.append(image)return images# Messages containing multiple images and a text query
messages = [{"role": "user","content": [{"type": "image", "image": "/ai/fight.png"},{"type": "image", "image": "/ai/long.png"},{"type": "text", "text": "描述下这两张图片"},],}
]# Load images
image_info = messages[0]["content"][:2]  # Extract image info from the message
images = load_images(image_info)# Preprocess the inputs
text_prompt = processor.apply_chat_template(messages, add_generation_prompt=True)inputs = processor(text=[text_prompt], images=images, padding=True, return_tensors="pt"
)
inputs = inputs.to("cuda")# Inference: Generation of the output
output_ids = model.generate(**inputs, max_new_tokens=128)
generated_ids = [output_ids[len(input_ids) :]for input_ids, output_ids in zip(inputs.input_ids, output_ids)
]
output_text = processor.batch_decode(generated_ids, skip_special_tokens=True, clean_up_tokenization_spaces=True
)
print(output_text)

视频
安装

pip install qwen-vl-utils

from qwen_vl_utils import process_vision_info# Messages containing a images list as a video and a text query
messages = [{"role": "user","content": [{"type": "video","video": ["file:///path/to/frame1.jpg","file:///path/to/frame2.jpg","file:///path/to/frame3.jpg","file:///path/to/frame4.jpg",],"fps": 1.0,},{"type": "text", "text": "Describe this video."},],}
]
# Messages containing a video and a text query
messages = [{"role": "user","content": [{"type": "video","video": "/ai/血液从上肢流入上腔静脉.mp4","max_pixels": 360 * 420,"fps": 1.0,},{"type": "text", "text": "描述下这个视频"},],}
]# Preparation for inference
text = processor.apply_chat_template(messages, tokenize=False, add_generation_prompt=True
)
image_inputs, video_inputs = process_vision_info(messages)
inputs = processor(text=[text],images=image_inputs,videos=video_inputs,padding=True,return_tensors="pt",
)
inputs = inputs.to("cuda")# Inference
generated_ids = model.generate(**inputs, max_new_tokens=128)
generated_ids_trimmed = [out_ids[len(in_ids) :] for in_ids, out_ids in zip(inputs.input_ids, generated_ids)
]
output_text = processor.batch_decode(generated_ids_trimmed, skip_special_tokens=True, clean_up_tokenization_spaces=False
)
print(output_text)