app.py

import spaces
import gradio as gr
import triton
from huggingface_hub import InferenceClient
from torch import nn
from transformers import AutoModel, AutoProcessor, AutoTokenizer, PreTrainedTokenizer, PreTrainedTokenizerFast, AutoModelForCausalLM, BitsAndBytesConfig
from pathlib import Path
import torch
import torch.amp.autocast_mode
from PIL import Image
import os
import torchvision.transforms.functional as TVF
import gc

CLIP_PATH = "google/siglip-so400m-patch14-384"
CHECKPOINT_PATH = Path("/content/joy-caption-alpha-two/cgrkzexw-599808")
TITLE = """
<div style="text-align: center; max-width: 700px; margin: 0 auto;">
    <h1 style="color: #FF00FF; font-size: 3em; margin-bottom: 0.5em;">Bullseye's JoyCaption Alpha Two</h1>
    <p style="color: #00FFFF; font-size: 1.2em;">Unleash the power of AI-driven image captioning!</p>
</div>
"""

CAPTION_TYPE_MAP = {
    "Descriptive": ["Write a descriptive caption for this image in a formal tone.", "Write a descriptive caption for this image in a formal tone within {word_count} words.", "Write a {length} descriptive caption for this image in a formal tone."],
    "Descriptive (Informal)": ["Write a descriptive caption for this image in a casual tone.", "Write a descriptive caption for this image in a casual tone within {word_count} words.", "Write a {length} descriptive caption for this image in a casual tone."],
    "Training Prompt": ["Write a stable diffusion prompt for this image.", "Write a stable diffusion prompt for this image within {word_count} words.", "Write a {length} stable diffusion prompt for this image."],
    "MidJourney": ["Write a MidJourney prompt for this image.", "Write a MidJourney prompt for this image within {word_count} words.", "Write a {length} MidJourney prompt for this image."],
    "Booru tag list": ["Write a list of Booru tags for this image.", "Write a list of Booru tags for this image within {word_count} words.", "Write a {length} list of Booru tags for this image."],
    "Booru-like tag list": ["Write a list of Booru-like tags for this image.", "Write a list of Booru-like tags for this image within {word_count} words.", "Write a {length} list of Booru-like tags for this image."],
    "Art Critic": ["Analyze this image like an art critic would with information about its composition, style, symbolism, the use of color, light, any artistic movement it might belong to, etc.", "Analyze this image like an art critic would with information about its composition, style, symbolism, the use of color, light, any artistic movement it might belong to, etc. Keep it within {word_count} words.", "Analyze this image like an art critic would with information about its composition, style, symbolism, the use of color, light, any artistic movement it might belong to, etc. Keep it {length}."],
    "Product Listing": ["Write a caption for this image as though it were a product listing.", "Write a caption for this image as though it were a product listing. Keep it under {word_count} words.", "Write a {length} caption for this image as though it were a product listing."],
    "Social Media Post": ["Write a caption for this image as if it were being used for a social media post.", "Write a caption for this image as if it were being used for a social media post. Limit the caption to {word_count} words.", "Write a {length} caption for this image as if it were being used for a social media post."],
}

HF_TOKEN = os.environ.get("HF_TOKEN", None)

class ImageAdapter(nn.Module):
    def __init__(self, input_features: int, output_features: int, ln1: bool, pos_emb: bool, num_image_tokens: int, deep_extract: bool):
        super().__init__()
        self.deep_extract = deep_extract

        if self.deep_extract:
            input_features = input_features * 5

        self.linear1 = nn.Linear(input_features, output_features)
        self.activation = nn.GELU()
        self.linear2 = nn.Linear(output_features, output_features)
        self.ln1 = nn.Identity() if not ln1 else nn.LayerNorm(input_features)
        self.pos_emb = None if not pos_emb else nn.Parameter(torch.zeros(num_image_tokens, input_features))

        # Other tokens (<|image_start|>, <|image_end|>, <|eot_id|>)
        self.other_tokens = nn.Embedding(3, output_features)
        self.other_tokens.weight.data.normal_(mean=0.0, std=0.02)   # Matches HF's implementation of llama3

    def forward(self, vision_outputs: torch.Tensor):
        if self.deep_extract:
            x = torch.concat((
                vision_outputs[-2],
                vision_outputs[3],
                vision_outputs[7],
                vision_outputs[13],
                vision_outputs[20],
            ), dim=-1)
            assert len(x.shape) == 3, f"Expected 3, got {len(x.shape)}"  # batch, tokens, features
            assert x.shape[-1] == vision_outputs[-2].shape[-1] * 5, f"Expected {vision_outputs[-2].shape[-1] * 5}, got {x.shape[-1]}"
        else:
            x = vision_outputs[-2]

        x = self.ln1(x)

        if self.pos_emb is not None:
            assert x.shape[-2:] == self.pos_emb.shape, f"Expected {self.pos_emb.shape}, got {x.shape[-2:]}"
            x = x + self.pos_emb

        x = self.linear1(x)
        x = self.activation(x)
        x = self.linear2(x)

        # <|image_start|>, IMAGE, <|image_end|>
        other_tokens = self.other_tokens(torch.tensor([0, 1], device=self.other_tokens.weight.device).expand(x.shape[0], -1))
        assert other_tokens.shape == (x.shape[0], 2, x.shape[2]), f"Expected {(x.shape[0], 2, x.shape[2])}, got {other_tokens.shape}"
        x = torch.cat((other_tokens[:, 0:1], x, other_tokens[:, 1:2]), dim=1)

        return x

    def get_eot_embedding(self):
        return self.other_tokens(torch.tensor([2], device=self.other_tokens.weight.device)).squeeze(0)

# Load CLIP
print("Loading CLIP")
clip_processor = AutoProcessor.from_pretrained(CLIP_PATH)
clip_model = AutoModel.from_pretrained(CLIP_PATH, torch_dtype=torch.float16)
clip_model = clip_model.vision_model

assert (CHECKPOINT_PATH / "clip_model.pt").exists()
print("Loading VLM's custom vision model")
checkpoint = torch.load(CHECKPOINT_PATH / "clip_model.pt", map_location='cpu')
checkpoint = {k.replace("_orig_mod.module.", ""): v for k, v in checkpoint.items()}
clip_model.load_state_dict(checkpoint)
del checkpoint

clip_model.eval()
clip_model.requires_grad_(False)
clip_model.to("cuda")
clip_model = torch.compile(clip_model)

# Tokenizer
print("Loading tokenizer")
tokenizer = AutoTokenizer.from_pretrained(CHECKPOINT_PATH / "text_model", use_fast=True)
assert isinstance(tokenizer, PreTrainedTokenizer) or isinstance(tokenizer, PreTrainedTokenizerFast), f"Tokenizer is of type {type(tokenizer)}"

# LLM
print("Loading LLM")
print("Loading VLM's custom text model")

# Configure 4-bit quantization
bnb_config = BitsAndBytesConfig(
    load_in_4bit=True,
    bnb_4bit_quant_type="nf4",
    bnb_4bit_compute_dtype=torch.float16,
    bnb_4bit_use_double_quant=True,
)

text_model = AutoModelForCausalLM.from_pretrained(
    CHECKPOINT_PATH / "text_model",
    device_map="auto",
    quantization_config=bnb_config,
    torch_dtype=torch.float16
)
text_model.gradient_checkpointing_enable()
text_model.eval()
text_model = torch.compile(text_model)

# Image Adapter
print("Loading image adapter")
image_adapter = ImageAdapter(clip_model.config.hidden_size, text_model.config.hidden_size, False, False, 38, False)
image_adapter.load_state_dict(torch.load(CHECKPOINT_PATH / "image_adapter.pt", map_location="cpu"))
image_adapter.eval()
image_adapter.to("cuda")
image_adapter = torch.compile(image_adapter)

@spaces.GPU()
@torch.no_grad()
def stream_chat(input_image: Image.Image, caption_type: str, caption_length: str | int, extra_options: list[str], name_input: str, custom_prompt: str) -> tuple[str, str]:
    torch.cuda.empty_cache()
    gc.collect()

    # 'any' means no length specified
    length = None if caption_length == "any" else caption_length

    if isinstance(length, str):
        try:
            length = int(length)
        except ValueError:
            pass
    
    # Build prompt
    if length is None:
        map_idx = 0
    elif isinstance(length, int):
        map_idx = 1
    elif isinstance(length, str):
        map_idx = 2
    else:
        raise ValueError(f"Invalid caption length: {length}")
    
    prompt_str = CAPTION_TYPE_MAP[caption_type][map_idx]

    # Add extra options
    if len(extra_options) > 0:
        prompt_str += " " + " ".join(extra_options)
    
    # Add name, length, word_count
    prompt_str = prompt_str.format(name=name_input, length=caption_length, word_count=caption_length)

    if custom_prompt.strip() != "":
        prompt_str = custom_prompt.strip()
    
    # For debugging
    print(f"Prompt: {prompt_str}")

    # Preprocess image
    image = input_image.resize((384, 384), Image.LANCZOS)
    image = image.convert('RGB')  # Ensure the image has 3 channels
    pixel_values = TVF.pil_to_tensor(image).unsqueeze(0) / 255.0
    pixel_values = TVF.normalize(pixel_values, [0.5, 0.5, 0.5], [0.5, 0.5, 0.5])  # Normalize for all 3 channels
    pixel_values = pixel_values.to('cuda', dtype=torch.float16)

    # Embed image
    with torch.amp.autocast_mode.autocast('cuda', dtype=torch.float16):
        vision_outputs = clip_model(pixel_values=pixel_values, output_hidden_states=True)
        embedded_images = image_adapter(vision_outputs.hidden_states)
        embedded_images = embedded_images.to('cuda', dtype=torch.float16)
    
    # Build the conversation
    convo = [
        {
            "role": "system",
            "content": "You are a helpful image captioner.",
        },
        {
            "role": "user",
            "content": prompt_str,
        },
    ]

    # Format the conversation
    convo_string = tokenizer.apply_chat_template(convo, tokenize = False, add_generation_prompt = True)
    assert isinstance(convo_string, str)

    # Tokenize the conversation
    convo_tokens = tokenizer.encode(convo_string, return_tensors="pt", add_special_tokens=False, truncation=False)
    prompt_tokens = tokenizer.encode(prompt_str, return_tensors="pt", add_special_tokens=False, truncation=False)
    assert isinstance(convo_tokens, torch.Tensor) and isinstance(prompt_tokens, torch.Tensor)
    convo_tokens = convo_tokens.squeeze(0)   # Squeeze just to make the following easier
    prompt_tokens = prompt_tokens.squeeze(0)

    # Calculate where to inject the image
    eot_id_indices = (convo_tokens == tokenizer.convert_tokens_to_ids("<|eot_id|>")).nonzero(as_tuple=True)[0].tolist()
    assert len(eot_id_indices) == 2, f"Expected 2 <|eot_id|> tokens, got {len(eot_id_indices)}"

    preamble_len = eot_id_indices[1] - prompt_tokens.shape[0]   # Number of tokens before the prompt

    # Embed the tokens
    convo_tokens = convo_tokens.unsqueeze(0).to('cuda')  # Keep as LongTensor
    convo_embeds = text_model.model.embed_tokens(convo_tokens)

    # Construct the input
    input_embeds = torch.cat([
        convo_embeds[:, :preamble_len],
        embedded_images,
        convo_embeds[:, preamble_len:],
    ], dim=1).to('cuda', dtype=torch.float16)

    input_ids = torch.cat([
        convo_tokens[:, :preamble_len],
        torch.zeros((1, embedded_images.shape[1]), dtype=torch.long, device='cuda'),
        convo_tokens[:, preamble_len:],
    ], dim=1)
    attention_mask = torch.ones_like(input_ids)

    # Debugging
    print(f"Input to model: {repr(tokenizer.decode(input_ids[0]))}")

    with torch.amp.autocast_mode.autocast('cuda', dtype=torch.float16):
        generate_ids = text_model.generate(
            input_ids,
            inputs_embeds=input_embeds,
            attention_mask=attention_mask,
            max_new_tokens=300,
            do_sample=True,
            suppress_tokens=None,
            use_cache=True
        )

    # Trim off the prompt
    generate_ids = generate_ids[:, input_ids.shape[1]:]
    if generate_ids[0][-1] == tokenizer.eos_token_id or generate_ids[0][-1] == tokenizer.convert_tokens_to_ids("<|eot_id|>"):
        generate_ids = generate_ids[:, :-1]

    caption = tokenizer.batch_decode(generate_ids, skip_special_tokens=False, clean_up_tokenization_spaces=False)[0]

    torch.cuda.empty_cache()
    gc.collect()

    return prompt_str, caption.strip()

def process_directory(directory_path, caption_type, caption_length, extra_options, name_input, custom_prompt):
    processed_images = []
    captions = []
    
    for filename in os.listdir(directory_path):
        if filename.lower().endswith(('.png', '.jpg', '.jpeg', '.gif', '.bmp')):
            img_path = os.path.join(directory_path, filename)
            img = Image.open(img_path)
            
            prompt, caption = stream_chat(img, caption_type, caption_length, extra_options, name_input, custom_prompt)
            
            # Save caption to a .txt file
            txt_filename = os.path.splitext(filename)[0] + '.txt'
            txt_path = os.path.join(directory_path, txt_filename)
            with open(txt_path, 'w', encoding='utf-8') as f:
                f.write(caption)

            processed_images.append(img_path)
            captions.append({"filename": filename, "caption": caption})
    
    return processed_images, captions

# Custom CSS for a futuristic, neon-inspired theme
custom_css = """
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&display=swap');

body {
    background-color: #000000;
    color: #00FFFF;
    font-family: 'Orbitron', sans-serif;
}

.gradio-container {
    background: linear-gradient(45deg, #1a1a2e, #16213e);
    border: 2px solid #FF00FF;
    border-radius: 15px;
    box-shadow: 0 0 20px #FF00FF;
}

.input-box, .output-box {
    background-color: rgba(15, 52, 96, 0.7);
    border: 1px solid #00FFFF;
    border-radius: 10px;
    padding: 15px;
    margin: 10px 0;
    box-shadow: 0 0 10px #00FFFF;
}

.input-box label, .output-box label {
    color: #FF00FF;
    font-weight: bold;
    text-shadow: 0 0 5px #FF00FF;
}

.gr-button {
    background: linear-gradient(45deg, #4a0e4e, #7a1e82);
    border: none;
    color: #FFFFFF;
    font-weight: bold;
    text-transform: uppercase;
    transition: all 0.3s ease;
}

.gr-button:hover {
    background: linear-gradient(45deg, #7a1e82, #4a0e4e);
    box-shadow: 0 0 15px #FF00FF;
    transform: scale(1.05);
}

.gr-dropdown {
    background-color: #0f3460;
    border: 1px solid #00FFFF;
    color: #FFFFFF;
}

.gr-checkbox-group {
    background-color: rgba(15, 52, 96, 0.7);
    border: 1px solid #00FFFF;
    border-radius: 10px;
    padding: 10px;
}

.gr-checkbox-group label {
    color: #FFFFFF;
}

.gr-form {
    border: 1px solid #FF00FF;
    border-radius: 10px;
    padding: 20px;
    margin: 10px 0;
    background: rgba(26, 26, 46, 0.7);
}

.gr-input {
    background-color: #0f3460;
    border: 1px solid #00FFFF;
    color: #FFFFFF;
    border-radius: 5px;
}

.gr-input:focus {
    box-shadow: 0 0 10px #00FFFF;
}

.gr-panel {
    border: 1px solid #FF00FF;
    border-radius: 10px;
    background: rgba(22, 33, 62, 0.7);
}
"""

with gr.Blocks(css=custom_css) as demo:
    gr.HTML(TITLE)

    with gr.Row():
        with gr.Column(scale=1):
            input_images = gr.File(file_count="multiple", label="📸 Upload Images", elem_classes="input-box")
            directory_input = gr.Textbox(label="📁 Or Enter Directory Path", elem_classes="input-box")

        with gr.Column(scale=2):
            with gr.Group():
                caption_type = gr.Dropdown(
                    choices=list(CAPTION_TYPE_MAP.keys()),
                    label="🎭 Caption Type",
                    value="Descriptive",
                    elem_classes="input-box"
                )

                caption_length = gr.Dropdown(
                    choices=["any", "very short", "short", "medium-length", "long", "very long"] +
                            [str(i) for i in range(20, 261, 10)],
                    label="📏 Caption Length",
                    value="long",
                    elem_classes="input-box"
                )

            with gr.Accordion("🔧 Advanced Options", open=False):
                extra_options = gr.CheckboxGroup(
                    choices=[
                        "If there is a person/character in the image you must refer to them as {name}.",
                        "Do NOT include information about people/characters that cannot be changed (like ethnicity, gender, etc), but do still include changeable attributes (like hair style).",
                        "Include information about lighting.",
                        "Include information about camera angle.",
                        "Include information about whether there is a watermark or not.",
                        "Include information about whether there are JPEG artifacts or not.",
                        "If it is a photo you MUST include information about what camera was likely used and details such as aperture, shutter speed, ISO, etc.",
                        "Do NOT include anything sexual; keep it PG.",
                        "Do NOT mention the image's resolution.",
                        "You MUST include information about the subjective aesthetic quality of the image from low to very high.",
                        "Include information on the image's composition style, such as leading lines, rule of thirds, or symmetry.",
                        "Do NOT mention any text that is in the image.",
                        "Specify the depth of field and whether the background is in focus or blurred.",
                        "If applicable, mention the likely use of artificial or natural lighting sources.",
                        "Do NOT use any ambiguous language.",
                        "Include whether the image is sfw, suggestive, or nsfw.",
                        "ONLY describe the most important elements of the image."
                    ],
                    label="Extra Options",
                    elem_classes="input-box"
                )

                name_input = gr.Textbox(label="👤 Person/Character Name (if applicable)", elem_classes="input-box")
                gr.Markdown("**Note:** Name input is only used if an Extra Option is selected that requires it.")

                custom_prompt = gr.Textbox(label="🎨 Custom Prompt (optional, will override all other settings)", elem_classes="input-box")
                gr.Markdown("**Note:** Alpha Two is not a general instruction follower and will not follow prompts outside its training data well. Use this feature with caution.")

    with gr.Row():
        run_button = gr.Button("🚀 Generate Captions", elem_classes="gr-button")

    with gr.Row():
        output_gallery = gr.Gallery(label="Processed Images", elem_classes="output-box")
        output_text = gr.JSON(label="Generated Captions", elem_classes="output-box")

    def process_and_display(images, caption_type, caption_length, extra_options, name_input, custom_prompt):
        processed_images = []
        captions = []
        
        for img_file in images:
            img = Image.open(img_file.name)
            prompt, caption = stream_chat(img, caption_type, caption_length, extra_options, name_input, custom_prompt)
            processed_images.append(img_file.name)
            captions.append({"filename": img_file.name, "caption": caption})
        
        return processed_images, captions

    def process_input(input_images, directory_path, caption_type, caption_length, extra_options, name_input, custom_prompt):
        if directory_path:
            return process_directory(directory_path, caption_type, caption_length, extra_options, name_input, custom_prompt)
        elif input_images:
            return process_and_display(input_images, caption_type, caption_length, extra_options, name_input, custom_prompt)
        else:
            return [], []

    run_button.click(
        fn=process_input,
        inputs=[input_images, directory_input, caption_type, caption_length, extra_options, name_input, custom_prompt],
        outputs=[output_gallery, output_text]
    )

if __name__ == "__main__":
    demo.launch(share=True)