app.py

import cv2
import gradio as gr
import os
from PIL import Image
import numpy as np
import torch
from torch.autograd import Variable
from torchvision import transforms
import torch.nn.functional as F
import matplotlib.pyplot as plt
import warnings
import time
warnings.filterwarnings("ignore")

os.system("git clone https://github.com/xuebinqin/DIS")
os.system("mv DIS/IS-Net/* .")

# project imports
from data_loader_cache import normalize, im_reader, im_preprocess 
from models import *

device = 'cuda' if torch.cuda.is_available() else 'cpu'

# Download official weights
if not os.path.exists("saved_models"):
    os.mkdir("saved_models")
    os.system("mv isnet.pth saved_models/")

class GOSNormalize(object):
    '''
    Normalize the Image using torch.transforms
    '''
    def __init__(self, mean=[0.485,0.456,0.406], std=[0.229,0.224,0.225]):
        self.mean = mean
        self.std = std

    def __call__(self,image):
        image = normalize(image,self.mean,self.std)
        return image

transform =  transforms.Compose([GOSNormalize([0.5,0.5,0.5],[1.0,1.0,1.0])])

def load_image(im_path, hypar):
    im = im_reader(im_path)
    im, im_shp = im_preprocess(im, hypar["cache_size"])
    im = torch.divide(im, 255.0)
    shape = torch.from_numpy(np.array(im_shp))
    return transform(im).unsqueeze(0), shape.unsqueeze(0)

def build_model(hypar, device):
    net = hypar["model"]

    # convert to half precision if needed
    if(hypar["model_digit"]=="half"):
        net.half()
        for layer in net.modules():
            if isinstance(layer, nn.BatchNorm2d):
                layer.float()

    net.to(device)

    if(hypar["restore_model"]!=""):
        net.load_state_dict(torch.load(hypar["model_path"]+"/"+hypar["restore_model"], map_location=device))
        net.to(device)
    net.eval()  
    return net

def predict(net, inputs_val, shapes_val, hypar, device):
    net.eval()

    if(hypar["model_digit"]=="full"):
        inputs_val = inputs_val.type(torch.FloatTensor)
    else:
        inputs_val = inputs_val.type(torch.HalfTensor)

    inputs_val_v = Variable(inputs_val, requires_grad=False).to(device) 
    ds_val = net(inputs_val_v)[0]
    pred_val = ds_val[0][0,:,:,:]
    pred_val = torch.squeeze(F.upsample(torch.unsqueeze(pred_val, 0),
                                        (shapes_val[0][0], shapes_val[0][1]),
                                        mode='bilinear'))

    ma = torch.max(pred_val)
    mi = torch.min(pred_val)
    pred_val = (pred_val - mi) / (ma - mi + 1e-8)  # normalize to 0~1, +1e-8 to avoid div by zero

    if device == 'cuda': 
        torch.cuda.empty_cache()
    return (pred_val.detach().cpu().numpy() * 255).astype(np.uint8)

# Parameters
hypar = {}
hypar["model_path"] = "./saved_models"
hypar["restore_model"] = "isnet.pth"
hypar["interm_sup"] = False
hypar["model_digit"] = "full"
hypar["seed"] = 0
hypar["cache_size"] = [1024, 1024]
hypar["input_size"] = [1024, 1024]
hypar["crop_size"] = [1024, 1024]
hypar["model"] = ISNetDIS()

# Build Model
net = build_model(hypar, device)

def inference(images, logs):
    start_time = time.time()

    # If user didn't upload images, just return empty
    if not images:
        return [], logs, logs

    processed_pairs = []
    for img_path in images:
        image_tensor, orig_size = load_image(img_path, hypar)
        mask = predict(net, image_tensor, orig_size, hypar, device)

        pil_mask = Image.fromarray(mask).convert('L')
        im_rgb = Image.open(img_path).convert("RGB")
        im_rgba = im_rgb.copy()
        im_rgba.putalpha(pil_mask)
        processed_pairs.append([im_rgba, pil_mask])
    
    end_time = time.time()
    elapsed = round(end_time - start_time, 2)

    # Flatten the list so that we can display all images in a single Gallery
    final_images = []
    for pair in processed_pairs:
        final_images.extend(pair)

    # Update logs
    logs = logs or ""
    logs += f"Processed {len(processed_pairs)} image(s) in {elapsed} seconds.\n"

    return final_images, logs, logs

title = "Highly Accurate Dichotomous Image Segmentation"
description = (
    "This is an unofficial demo for DIS, a model that can remove the background from a given image. "
    "To use it, simply upload up to 3 images, or click one of the examples to load them. "
    "Read more at the links below.<br>"
    "GitHub: https://github.com/xuebinqin/DIS<br>"
    "Telegram bot: https://t.me/restoration_photo_bot<br>"
    "[![](https://img.shields.io/twitter/follow/DoEvent?label=@DoEvent&style=social)](https://twitter.com/DoEvent)"
)
article = (
    "<div><center><img src='https://visitor-badge.glitch.me/badge?page_id=max_skobeev_dis_cmp_public' "
    "alt='visitor badge'></center></div>"
)

interface = gr.Interface(
    fn=inference,
    inputs=[gr.Image(
                type='filepath', 
                label='Images (up to 3)', 
                multiple=True, 
                max_count=3
            ), 
            gr.State()],
    outputs=[
        gr.Gallery(label="Output (rgba + mask)"),
        gr.State(),
        gr.Textbox(label="Logs", lines=6)
    ],
    examples=[['robot.png'], ['ship.png']],  # for multi-image examples, pass a list like ['robot.png','ship.png']
    title=title,
    description=description,
    article=article,
    flagging_mode="never",
    cache_mode="lazy",
).queue().launch(show_api=True, show_error=True)