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import requests |
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from PIL import Image |
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from io import BytesIO |
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import torch |
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from transformers import AutoTokenizer |
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from llava.model import LlavaLlamaForCausalLM |
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from llava.utils import disable_torch_init |
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from llava.constants import IMAGE_TOKEN_INDEX |
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from llava.mm_utils import tokenizer_image_token, KeywordsStoppingCriteria |
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def model_fn(model_dir): |
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kwargs = {"device_map": "auto"} |
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kwargs["torch_dtype"] = torch.float16 |
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model = LlavaLlamaForCausalLM.from_pretrained( |
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model_dir, low_cpu_mem_usage=True, **kwargs |
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) |
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tokenizer = AutoTokenizer.from_pretrained(model_dir, use_fast=False) |
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vision_tower = model.get_vision_tower() |
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if not vision_tower.is_loaded: |
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vision_tower.load_model() |
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vision_tower.to(device="cuda", dtype=torch.float16) |
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image_processor = vision_tower.image_processor |
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return model, tokenizer, image_processor |
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def predict_fn(data, model_and_tokenizer): |
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model, tokenizer, image_processor = model_and_tokenizer |
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image_file = data.pop("image", data) |
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prompt = data.pop("question", data) |
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max_new_tokens = data.pop("max_new_tokens", 1024) |
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temperature = data.pop("temperature", 0.2) |
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stop_str = data.pop("stop_str", "###") |
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if image_file.startswith("http") or image_file.startswith("https"): |
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response = requests.get(image_file) |
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image = Image.open(BytesIO(response.content)).convert("RGB") |
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else: |
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image = Image.open(image_file).convert("RGB") |
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disable_torch_init() |
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image_tensor = ( |
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image_processor.preprocess(image, return_tensors="pt")["pixel_values"] |
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.half() |
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.cuda() |
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) |
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keywords = [stop_str] |
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input_ids = ( |
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tokenizer_image_token(prompt, tokenizer, IMAGE_TOKEN_INDEX, return_tensors="pt") |
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.unsqueeze(0) |
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.cuda() |
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) |
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stopping_criteria = KeywordsStoppingCriteria(keywords, tokenizer, input_ids) |
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with torch.inference_mode(): |
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output_ids = model.generate( |
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input_ids, |
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images=image_tensor, |
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do_sample=True, |
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temperature=temperature, |
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max_new_tokens=max_new_tokens, |
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use_cache=True, |
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stopping_criteria=[stopping_criteria], |
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) |
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outputs = tokenizer.decode( |
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output_ids[0, input_ids.shape[1] :], skip_special_tokens=True |
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).strip() |
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return outputs |
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