Create README.md

README.md

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+---
+license: apache-2.0
+base_model:
+- OpenGVLab/InternVL2-4B
+pipeline_tag: image-text-to-text
+library_name: transformers
+---
+
+# ChatGen: Automatic Text-to-Image Generation From FreeStyle Chatting
+
+<div align="center">
+
+[\[🏠Homepage\]](https://chengyou-jia.github.io/ChatGen-Home/) [\[💻Code\]](https://github.com/chengyou-jia/ChatGen) [\[🚀Quick Start\]](#quick-start) [\[📝Paper\]](https://arxiv.org/abs/2411.17176) [\[🤗Models\]](https://huggingface.co/ChengyouJia/ChatGen-Base-4B)[\[🤗Data\]](https://huggingface.co/datasets/ChengyouJia/ChatGenBench)
+
+</div>
+
+## Overview
+![ChatGen](./case_step.png)
+
+ChatGen aims to automate tedious steps in text-to-image, allowing users to simply describe their needs in a freestyle chatting way.
+
+
+
+## ChatGen-Base-4B 
+
+`ChatGen-Base-4B` is a MLLM finetuned from InternVL-4B. By taking as input a system prompt, and freestyle user query, 
+the model generates suitable prompts, appropriate models, and specific arguments.
+
+
+### Installation
+To use `ChatGen-Base-4B`, first install the necessary dependencies:
+```bash
+pip install transformers
+```
+
+### Example Inference Code
+Inference code example:
+```python
+import numpy as np
+import torch
+import torchvision.transforms as T
+from PIL import Image
+from torchvision.transforms.functional import InterpolationMode
+from transformers import AutoModel, AutoTokenizer
+
+IMAGENET_MEAN = (0.485, 0.456, 0.406)
+IMAGENET_STD = (0.229, 0.224, 0.225)
+
+def build_transform(input_size):
+    MEAN, STD = IMAGENET_MEAN, IMAGENET_STD
+    transform = T.Compose([
+        T.Lambda(lambda img: img.convert('RGB') if img.mode != 'RGB' else img),
+        T.Resize((input_size, input_size), interpolation=InterpolationMode.BICUBIC),
+        T.ToTensor(),
+        T.Normalize(mean=MEAN, std=STD)
+    ])
+    return transform
+
+def find_closest_aspect_ratio(aspect_ratio, target_ratios, width, height, image_size):
+    best_ratio_diff = float('inf')
+    best_ratio = (1, 1)
+    area = width * height
+    for ratio in target_ratios:
+        target_aspect_ratio = ratio[0] / ratio[1]
+        ratio_diff = abs(aspect_ratio - target_aspect_ratio)
+        if ratio_diff < best_ratio_diff:
+            best_ratio_diff = ratio_diff
+            best_ratio = ratio
+        elif ratio_diff == best_ratio_diff:
+            if area > 0.5 * image_size * image_size * ratio[0] * ratio[1]:
+                best_ratio = ratio
+    return best_ratio
+
+def dynamic_preprocess(image, min_num=1, max_num=12, image_size=448, use_thumbnail=False):
+    orig_width, orig_height = image.size
+    aspect_ratio = orig_width / orig_height
+
+    # calculate the existing image aspect ratio
+    target_ratios = set(
+        (i, j) for n in range(min_num, max_num + 1) for i in range(1, n + 1) for j in range(1, n + 1) if
+        i * j <= max_num and i * j >= min_num)
+    target_ratios = sorted(target_ratios, key=lambda x: x[0] * x[1])
+
+    # find the closest aspect ratio to the target
+    target_aspect_ratio = find_closest_aspect_ratio(
+        aspect_ratio, target_ratios, orig_width, orig_height, image_size)
+
+    # calculate the target width and height
+    target_width = image_size * target_aspect_ratio[0]
+    target_height = image_size * target_aspect_ratio[1]
+    blocks = target_aspect_ratio[0] * target_aspect_ratio[1]
+
+    # resize the image
+    resized_img = image.resize((target_width, target_height))
+    processed_images = []
+    for i in range(blocks):
+        box = (
+            (i % (target_width // image_size)) * image_size,
+            (i // (target_width // image_size)) * image_size,
+            ((i % (target_width // image_size)) + 1) * image_size,
+            ((i // (target_width // image_size)) + 1) * image_size
+        )
+        # split the image
+        split_img = resized_img.crop(box)
+        processed_images.append(split_img)
+    assert len(processed_images) == blocks
+    if use_thumbnail and len(processed_images) != 1:
+        thumbnail_img = image.resize((image_size, image_size))
+        processed_images.append(thumbnail_img)
+    return processed_images
+
+def load_image(image_file, input_size=448, max_num=12):
+    image = Image.open(image_file).convert('RGB')
+    transform = build_transform(input_size=input_size)
+    images = dynamic_preprocess(image, image_size=input_size, use_thumbnail=True, max_num=max_num)
+    pixel_values = [transform(image) for image in images]
+    pixel_values = torch.stack(pixel_values)
+    return pixel_values
+
+# If you want to load a model using multiple GPUs, please refer to the `Multiple GPUs` section.
+path = 'ChengyouJia/ChatGen-Base-4B'
+model = AutoModel.from_pretrained(
+    path,
+    torch_dtype=torch.bfloat16,
+    low_cpu_mem_usage=True,
+    trust_remote_code=True).eval().cuda()
+tokenizer = AutoTokenizer.from_pretrained(path, trust_remote_code=True, use_fast=False)
+
+sys_singlemodal = """
+You are a user requirements translation expert. I have a freestyle prompt written by a non professional user for text-to-image tasks. Please convert the content of this freestyle prompt into professional prompt and professional negativePrompt, and provide the model and its parameters that are most suitable for the user's text-to-image task.
+Here is the content I need you to convert:
+"""
+
+sys_multimodal = """
+You are a user requirements translation expert. I have a freestyle prompt written by a non professional user for text-to-image tasks.
+Additionally, a general user provide several reference images, indicating that they want the final generated image to have a style similar to those images. You should combine the reference images to convert the content of the freestyle prompt into professional prompt and professional negativePrompt, and provide the model and its parameters that are most suitable for the user's text-to-image task.
+Here are the reference images and content I need you to convert:
+"""
+
+# set the max number of tiles in `max_num`
+pixel_values = None
+<!-- pixel_values = load_image(<image_path>, max_num=6).to(torch.bfloat16).cuda() -->
+generation_config = dict(max_new_tokens=1024, do_sample=True)
+
+question = "Whip up a cool sci-fi robot girl, colorful and detailed from waist up, y'know?"
+
+input = sys_singlemodal + question 
+response, history = model.chat(tokenizer, None, input, generation_config, history=None, return_history=True)
+print(f'User: {question}\nAssistant: {response}')
+```
+```
+
+## Citation
+If you find this repository helpful, feel free to cite our paper:
+```bibtex
+@article{jia2024chatgen, 
+  title={ChatGen: Automatic Text-to-Image Generation From FreeStyle Chatting}, 
+  author={Jia, Chengyou and Xia, Changliang and Dang, Zhuohang and Wu, Weijia and Qian, Hangwei and Luo, Minnan}, 
+  journal={arXiv preprint arXiv:2411.17176}, 
+  year={2024}
+}
+```