app.py

import os

import clip
import faiss
import torch
import tarfile
import gradio as gr
import pandas as pd
from PIL import Image
from braceexpand import braceexpand


# Load model
checkpoint_path = "ViT-B/16"
device = "cuda" if torch.cuda.is_available() else "cpu"
model, preprocess = clip.load(checkpoint_path, device=device, jit=False)


def generate_caption(img):
    # Load caption bank
    df = pd.read_parquet("files/captions.parquet")
    caption_list = df["caption"].tolist()

    # Load index
    index = faiss.read_index("files/caption_bank.index")

    # Encode the image and query the caption bank index
    query_features = model.encode_image(preprocess(img).unsqueeze(0).to(device))
    query_features = query_features / query_features.norm(dim=-1, keepdim=True)
    query_features = query_features.cpu().detach().numpy().astype("float32")

    # Get nearest captions
    d, i = index.search(query_features, 1)
    d, i = d[0], i[0]
    idx = i[0]
    distance = d[0]

    # Start with a description of the image
    caption = caption_list[idx]

    print(f"Index: {idx} - Distance: {distance:.2f}")
    return caption


def predict_brand(img):
    # Load brand bank
    df = pd.read_parquet("files/brands.parquet")
    brand_list = df["brands"].tolist()

    # Load index
    index = faiss.read_index("files/brand_bank.index")

    # Encode the image and query the brand bank index
    query_features = model.encode_image(preprocess(img).unsqueeze(0).to(device))
    query_features = query_features / query_features.norm(dim=-1, keepdim=True)
    query_features = query_features.cpu().detach().numpy().astype("float32")

    # Get nearest brands
    d, i = index.search(query_features, 1)
    d, i = d[0], i[0]
    idx = i[0]
    distance = d[0]

    brand = brand_list[idx]
    print(f"Index: {idx} - Distance: {distance:.2f}")
    return brand


def estimate_price_and_usage(img):
    query_features = model.encode_image(preprocess(img).unsqueeze(0).to(device))

    # Estimate usage
    num_classes = 2
    probe = torch.nn.Linear(
        query_features.shape[-1],
        num_classes,
        dtype=torch.float16,
        bias=False
    )
    # Load weights for the linear layer as a tensor
    linear_data = torch.load("files/reuse_linear.pth")
    probe.weight.data = linear_data["weight"]

    # Do inference
    probe.eval()
    probe = probe.to(device)
    output = probe(query_features)
    print(output)
    output = torch.softmax(output, dim=-1)
    output = output.cpu().detach().numpy().astype("float32")
    reuse = output.argmax(axis=-1)[0]
    reuse_classes = ["Reuse", "Export"]

    # Estimate price
    num_classes = 4
    probe = torch.nn.Linear(
        query_features.shape[-1],
        num_classes,
        dtype=torch.float16,
        bias=False
    )
    # Print output shape for the linear layer
    # Load weights for the linear layer as a tensor
    linear_data = torch.load("files/price_linear.pth")
    probe.weight.data = linear_data["weight"]

    # Do inference
    probe.eval()
    probe = probe.to(device)
    output = probe(query_features)
    output = torch.softmax(output, dim=-1)
    output = output.cpu().detach().numpy().astype("float32")
    price = output.argmax(axis=-1)[0]
    price_classes = ["<50", "50-100", "100-150", ">150"]

    return f"Estimated price: {price_classes[price]} SEK - Usage: {reuse_classes[reuse]}"


def retrieve(query):
    index_folder = "files/index"
    num_results = 3

    # Read image metadata
    metadata_df = pd.read_parquet(os.path.join(index_folder, "metadata.parquet"))
    key_list = metadata_df["key"].tolist()

    # Load the index
    index = faiss.read_index(os.path.join(index_folder, "image.index"))

    # Encode the query
    if isinstance(query, str):
        print("Query is a string")
        text = clip.tokenize([query]).to(device)
        query_features = model.encode_text(text)
    else:
        print("Query is an image")
        query_features = model.encode_image(preprocess(query).unsqueeze(0).to(device))
    query_features = query_features / query_features.norm(dim=-1, keepdim=True)
    query_features = query_features.cpu().detach().numpy().astype("float32")

    d, i = index.search(query_features, num_results)
    print(f"Found {num_results} items with query '{query}'")
    indices = i[0]
    similarities = d[0]

    min_d = min(similarities)
    max_d = max(similarities)
    print(f"The minimum similarity is {min_d:.2f} and the maximum is {max_d:.2f}")

    # Uncomment to generate combined.tar, combine the image_tars into a single tarfile
    """
    dataset_dir = "/fs/sefs1/circularfashion/sellpy/front_balanced"
    image_tars = [os.path.join(dataset_dir, file) for file in sorted(braceexpand("{00000..00010}.tar"))]
    with tarfile.open("files/combined.tar", "w") as combined_tar:
        for tar in image_tars:
            with tarfile.open(tar, "r") as tar_file:
                for member in tar_file.getmembers():
                    combined_tar.addfile(member, tar_file.extractfile(member))
    """

    images = []
    for idx in indices:
        image_name = key_list[idx]
        with tarfile.open("files/combined.tar", "r") as tar_file:
            image = tar_file.extractfile(f"{image_name}.jpg")
            image = Image.open(image).copy()
            images.append(image)
    return images


theme = gr.Theme.from_hub("JohnSmith9982/small_and_pretty")

with gr.Blocks(
    theme=theme,
    css="footer {visibility: hidden}",
) as demo:
    with gr.Tab("Captioning and Prediction"):
        with gr.Row(variant="compact"):
            input_img = gr.Image(type="pil", show_label=False)
            with gr.Column(min_width="80"):
                btn_generate_caption = gr.Button("Create Description").style(size="sm")
                generated_caption = gr.Textbox(label="Description", show_label=False)
        with gr.Row(variant="compact"):
            brand_img = gr.Image(type="pil", show_label=False)
            with gr.Column(min_width="80"):
                btn_predict_brand = gr.Button("Predict Brand").style(size="sm")
                predicted_brand = gr.Textbox(label="Brand", show_label=False)

        with gr.Column(variant="compact"):
            btn_estimate = gr.Button("Estimate Price and Reuse").style(size="sm")
            text_box = gr.Textbox(label="Estimates:", show_label=False)
    with gr.Tab("Image Retrieval"):
        with gr.Row(variant="compact"):
            with gr.Column():
                query_img = gr.Image(type="pil", label="Image Query")
                btn_image_query = gr.Button("Retrieve Garments").style(size="sm")
                img_query_gallery = gr.Gallery(show_label=False).style(rows=1, columns=3)
        with gr.Row(variant="compact"):
            with gr.Column():
                query_text = gr.Textbox(label="Text Query", placeholder="Enter a description")
                btn_text_query = gr.Button("Retrieve Garments").style(size="sm")
                text_query_gallery = gr.Gallery(show_label=False).style(rows=1, columns=3)

    # Listeners
    btn_generate_caption.click(fn=generate_caption, inputs=input_img, outputs=generated_caption)
    btn_predict_brand.click(fn=predict_brand, inputs=brand_img, outputs=predicted_brand)
    btn_estimate.click(fn=estimate_price_and_usage, inputs=input_img, outputs=text_box)
    btn_image_query.click(fn=retrieve, inputs=query_img, outputs=img_query_gallery)
    btn_text_query.click(fn=retrieve, inputs=query_text, outputs=text_query_gallery)


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