app.py

import gradio as gr
from sae_auto_interp.sae import Sae
from sae_auto_interp.utils import maybe_load_llava_model, load_single_sae
from sae_auto_interp.features.features import upsample_mask
import torch
from transformers import AutoTokenizer
from PIL import Image

CITATION_BUTTON_TEXT = """
@misc{zhang2024largemultimodalmodelsinterpret,
      title={Large Multi-modal Models Can Interpret Features in Large Multi-modal Models},
      author={Kaichen Zhang and Yifei Shen and Bo Li and Ziwei Liu},
      year={2024},
      eprint={2411.14982},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2411.14982},
}
"""

cached_tensor = None
topk_indices = None

sunglasses_file_path = "assets/sunglasses.jpg"
greedy_file_path = "assets/greedy.jpg"
railway_file_path = "assets/railway.jpg"


def generate_activations(image):
    prompt = "<image>"
    inputs = processor(images=image, text=prompt, return_tensors="pt").to(model.device)
    global cached_tensor, topk_indices

    def hook(module: torch.nn.Module, _, outputs):
        global cached_tensor, topk_indices
        # Maybe unpack tuple outputs
        if isinstance(outputs, tuple):
            unpack_outputs = list(outputs)
        else:
            unpack_outputs = list(outputs)
        latents = sae.pre_acts(unpack_outputs[0])
        # When the tokenizer is llama and text is None (image only)
        # I skip the first bos tokens
        if "llama" in tokenizer.name_or_path:
            latents = latents[:, 1:, :]

        topk = torch.topk(
            latents, k=sae.cfg.k, dim=-1
        )
        # make all other values 0
        result = torch.zeros_like(latents)
        # results (bs, seq, num_latents)
        result.scatter_(-1, topk.indices, topk.values)
        cached_tensor = result.detach().cpu()
        topk_indices = (
            latents.squeeze(0).mean(dim=0).topk(k=100).indices.detach().cpu()
        )

    handles = [hooked_module.register_forward_hook(hook)]
    try:
        with torch.no_grad():
            outputs = model(
                input_ids=inputs["input_ids"].to("cuda"),
                pixel_values=inputs["pixel_values"].to("cuda"),
                image_sizes=inputs["image_sizes"].to("cuda"),
                attention_mask=inputs["attention_mask"].to("cuda"),
            )
    finally:
        for handle in handles:
            handle.remove()
    
    print(cached_tensor.shape)
    torch.cuda.empty_cache()
    return topk_indices
    

def visualize_activations(image, feature_num):
    base_img_tokens = 576
    patch_size = 24
    # Using Cached tensor
    # select the feature_num-th feature
    # Then keeping the first 576 tokens
    base_image_activations = cached_tensor[0, :base_img_tokens, feature_num].view(patch_size, patch_size)

    upsampled_image_mask = upsample_mask(base_image_activations, (336, 336))
    

    background = Image.new("L", (336, 336), 0).convert("RGB")

    # Somehow as I looked closer into the llava-hf preprocessing code,
    # I found out that they don't use the padded image as the base image feat
    # but use the simple resized image. This is different from original llava but
    # we align to llava-hf for now as we use llava-hf
    resized_image = image.resize((336, 336))
    activation_images = Image.composite(background, resized_image, upsampled_image_mask).convert("RGB")

    return activation_images


with gr.Blocks() as demo:
    gr.Markdown(
        """
        # Large Multi-modal Models Can Interpret Features in Large Multi-modal Models

        🔍 [ArXiv Paper](https://arxiv.org/abs/2411.14982) | 🏠 [LMMs-Lab Homepage](https://lmms-lab.framer.ai) | 🤗 [Huggingface Collections](https://huggingface.co/collections/lmms-lab/llava-sae-674026e4e7bc8c29c70bc3a3)
        """
    )

    with gr.Tabs(elem_classes="tab-buttons") as tabs:
        with gr.TabItem("Visualization of Activations", elem_id="visualization", id=0):
            with gr.Row():
                with gr.Column():
                    image = gr.Image(type="pil", interactive=True, label="Sample Image")
                    topk_features = gr.Textbox(value=topk_indices, placeholder="Top 100 Features", label="Top 100 Features")
                    with gr.Row():
                        clear_btn = gr.ClearButton([image, topk_features], value="Clear")
                        submit_btn = gr.Button("Submit", variant="primary")
                        submit_btn.click(generate_activations, inputs=[image], outputs=[topk_features])
                with gr.Column():
                    output = gr.Image(label="Activation Visualization")
                    feature_num = gr.Slider(1, 131072, 1, 1, label="Feature Number", interactive=True)
                    visualize_btn = gr.Button("Visualize", variant="primary")
                    visualize_btn.click(visualize_activations, inputs=[image, feature_num], outputs=[output])
                
            dummy_text = gr.Textbox(visible=False, label="Explanation")
            gr.Examples(
                [
                    ["assets/sunglasses.jpg", 10, "Sunglasses"],
                    ["assets/greedy.jpg", 14, "Greedy eating"],
                    ["assets/railway.jpg", 28, "Railway tracks"],
                ],
                inputs=[image, feature_num, dummy_text],
                label="Examples",
            )

        with gr.TabItem("Steering Model", elem_id="steering", id=2):
            chatbot = gr.Chatbot()

    with gr.Row():
        with gr.Accordion("📙 Citation", open=False):
            gr.Markdown("```bib\n" + CITATION_BUTTON_TEXT + "\n```")


if __name__ == "__main__":
    tokenizer = AutoTokenizer.from_pretrained("llava-hf/llama3-llava-next-8b-hf")
    sae = load_single_sae("lmms-lab/llama3-llava-next-8b-hf-sae-131k", "model.layers.24")
    model, processor = maybe_load_llava_model(
        "llava-hf/llama3-llava-next-8b-hf",
        rank=0,
        dtype=torch.bfloat16,
        hf_token=None
    )
    hooked_module = model.language_model.get_submodule("model.layers.24")

    demo.launch()