app.py

import gradio as gr
import numpy as np
from CLIP.clip import ClipWrapper, saliency_configs
from time import time
from matplotlib import pyplot as plt
import io
from PIL import Image, ImageDraw, ImageFont


def plot_to_png(fig):
    buf = io.BytesIO()
    plt.savefig(buf, format="png")
    buf.seek(0)
    img = np.array(Image.open(buf)).astype(np.uint8)
    return img


def add_text_to_image(
    image: np.ndarray,
    text,
    position,
    color="rgb(255, 255, 255)",
    fontsize=60,
):
    image = Image.fromarray(image)
    draw = ImageDraw.Draw(image)
    draw.text(
        position,
        text,
        fill=color,
        font=ImageFont.truetype(
            "/usr/share/fonts/truetype/lato/Lato-Medium.ttf", fontsize
        ),
    )
    return np.array(image)


def generate_relevancy(
    img: np.array, labels: str, prompt: str, saliency_config: str, subtract_mean: bool
):
    labels = labels.split(",")
    prompts = [prompt]
    img = np.asarray(Image.fromarray(img).resize((244 * 4, 244 * 4)))
    assert img.dtype == np.uint8
    h, w, c = img.shape
    start = time()
    grads = ClipWrapper.get_clip_saliency(
        img=img,
        text_labels=np.array(labels),
        prompts=prompts,
        **saliency_configs[saliency_config](h),
    )[0]
    print("inference took", float(time() - start))
    if subtract_mean:
        grads -= grads.mean(axis=0)
    grads = grads.cpu().numpy()
    vmin = 0.002
    cmap = plt.get_cmap("jet")
    vmax = 0.008

    returns = []
    for label_grad, label in zip(grads, labels):
        fig, ax = plt.subplots(1, 1, figsize=(4, 4))
        ax.axis("off")
        ax.imshow(img)
        grad = np.clip((label_grad - vmin) / (vmax - vmin), a_min=0.0, a_max=1.0)
        colored_grad = cmap(grad)
        grad = 1 - grad
        colored_grad[..., -1] = grad * 0.7
        colored_grad = add_text_to_image(
            (colored_grad * 255).astype(np.uint8), text=label, position=(0, 0)
        )
        colored_grad = colored_grad.astype(float) / 255
        ax.imshow(colored_grad)
        plt.tight_layout(pad=0)
        returns.append(plot_to_png(fig))
        plt.close(fig)
    return returns


iface = gr.Interface(
    title="Semantic Abstraction Multi-scale Relevancy Extractor",
    description="""A demo of [Semantic Abstraction](https://semantic-abstraction.cs.columbia.edu/)'s Multi-Scale Relevancy Extractor. To run GPU inference locally, use the [official codebase release](https://github.com/columbia-ai-robotics/semantic-abstraction).

This relevancy extractor builds heavily on [Chefer et al.'s codebase](https://github.com/hila-chefer/Transformer-MM-Explainability) and [CLIP on Wheels' codebase](https://cow.cs.columbia.edu/).""",
    fn=generate_relevancy,
    cache_examples=True,
    inputs=[
        gr.Image(type="numpy", label="Image"),
        gr.Textbox(label="Labels (comma separated)"),
        gr.Textbox(label="Prompt"),
        gr.Dropdown(
            value="ours",
            choices=["ours", "ours_fast", "chefer_et_al"],
            label="Relevancy Configuration",
        ),
        gr.Checkbox(value=True, label="subtract mean"),
    ],
    outputs=gr.Gallery(label="Relevancy Maps", type="numpy"),
    examples=[
        [
            "https://semantic-abstraction.cs.columbia.edu/downloads/gameroom.png",
            "basketball jersey,nintendo switch,television,ping pong table,vase,fireplace,abstract painting of a vespa,carpet,wall",
            "a photograph of a {} in a home.",
            "ours_fast",
            True,
        ],
        [
            "https://semantic-abstraction.cs.columbia.edu/downloads/livingroom.png",
            "monopoly boardgame set,door knob,sofa,coffee table,plant,carpet,wall",
            "a photograph of a {} in a home.",
            "ours_fast",
            True,
        ],
        [
            "https://semantic-abstraction.cs.columbia.edu/downloads/fireplace.png",
            "fireplace,beige armchair,candle,large indoor plant in a pot,forest painting,cheetah-patterned pillow,floor,carpet,wall",
            "a photograph of a {} in a home.",
            "ours_fast",
            True,
        ],
        [
            "https://semantic-abstraction.cs.columbia.edu/downloads/walle.png",
            "WALL-E,a fire extinguisher",
            "a 3D render of {}.",
            "ours_fast",
            True,
        ],
    ],
)
iface.launch(share=True)
# iface.launch()