Create app.py

app.py

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+import os
+import cv2
+import numpy as np
+import torch
+import gradio as gr
+import spaces
+
+from glob import glob
+from typing import Tuple
+
+from PIL import Image
+import torch
+from torchvision import transforms
+
+import requests
+from io import BytesIO
+import zipfile
+
+# Fix the HF space permission error when using from_pretrained(..., trust_remote_code=True)
+os.environ["HF_MODULES_CACHE"] = os.path.join("/tmp/hf_cache", "modules")
+
+import transformers
+transformers.utils.move_cache()
+
+
+torch.set_float32_matmul_precision('high')
+torch.jit.script = lambda f: f
+
+device = "cuda" if torch.cuda.is_available() else "cpu"
+
+
+## CPU version refinement
+def FB_blur_fusion_foreground_estimator_cpu(image, FG, B, alpha, r=90):
+    if isinstance(image, Image.Image):
+        image = np.array(image) / 255.0
+    blurred_alpha = cv2.blur(alpha, (r, r))[:, :, None]
+
+    blurred_FGA = cv2.blur(FG * alpha, (r, r))
+    blurred_FG = blurred_FGA / (blurred_alpha + 1e-5)
+
+    blurred_B1A = cv2.blur(B * (1 - alpha), (r, r))
+    blurred_B = blurred_B1A / ((1 - blurred_alpha) + 1e-5)
+    FG = blurred_FG + alpha * (image - alpha * blurred_FG - (1 - alpha) * blurred_B)
+    FG = np.clip(FG, 0, 1)
+    return FG, blurred_B
+
+
+def FB_blur_fusion_foreground_estimator_cpu_2(image, alpha, r=90):
+    # Thanks to the source: https://github.com/Photoroom/fast-foreground-estimation
+    alpha = alpha[:, :, None]
+    FG, blur_B = FB_blur_fusion_foreground_estimator_cpu(image, image, image, alpha, r)
+    return FB_blur_fusion_foreground_estimator_cpu(image, FG, blur_B, alpha, r=6)[0]
+
+
+## GPU version refinement
+def mean_blur(x, kernel_size):
+    """
+    equivalent to cv.blur
+    x:  [B, C, H, W]
+    """
+    if kernel_size % 2 == 0:
+        pad_l = kernel_size // 2 - 1
+        pad_r = kernel_size // 2
+        pad_t = kernel_size // 2 - 1
+        pad_b = kernel_size // 2
+    else:
+        pad_l = pad_r = pad_t = pad_b = kernel_size // 2
+
+    x_padded = torch.nn.functional.pad(x, (pad_l, pad_r, pad_t, pad_b), mode='replicate')
+
+    return torch.nn.functional.avg_pool2d(x_padded, kernel_size=(kernel_size, kernel_size), stride=1, count_include_pad=False)
+
+def FB_blur_fusion_foreground_estimator_gpu(image, FG, B, alpha, r=90):
+    as_dtype = lambda x, dtype: x.to(dtype) if x.dtype != dtype else x
+
+    input_dtype = image.dtype
+    # convert image to float to avoid overflow
+    image = as_dtype(image, torch.float32)
+    FG = as_dtype(FG, torch.float32)
+    B = as_dtype(B, torch.float32)
+    alpha = as_dtype(alpha, torch.float32)
+
+    blurred_alpha = mean_blur(alpha, kernel_size=r)
+
+    blurred_FGA = mean_blur(FG * alpha, kernel_size=r)
+    blurred_FG = blurred_FGA / (blurred_alpha + 1e-5)
+
+    blurred_B1A = mean_blur(B * (1 - alpha), kernel_size=r)
+    blurred_B = blurred_B1A / ((1 - blurred_alpha) + 1e-5)
+
+    FG_output = blurred_FG + alpha * (image - alpha * blurred_FG - (1 - alpha) * blurred_B)
+    FG_output = torch.clamp(FG_output, 0, 1)
+
+    return as_dtype(FG_output, input_dtype), as_dtype(blurred_B, input_dtype)
+
+
+def FB_blur_fusion_foreground_estimator_gpu_2(image, alpha, r=90):
+    # Thanks to the source: https://github.com/ZhengPeng7/BiRefNet/issues/226#issuecomment-3016433728
+    FG, blur_B = FB_blur_fusion_foreground_estimator_gpu(image, image, image, alpha, r)
+    return FB_blur_fusion_foreground_estimator_gpu(image, FG, blur_B, alpha, r=6)[0]
+
+
+def refine_foreground(image, mask, r=90, device='cuda'):
+    """both image and mask are in range of [0, 1]"""
+    if mask.size != image.size:
+        mask = mask.resize(image.size)
+
+    if device == 'cuda':
+        image = transforms.functional.to_tensor(image).float().cuda()
+        mask = transforms.functional.to_tensor(mask).float().cuda()
+        image = image.unsqueeze(0)
+        mask = mask.unsqueeze(0)
+
+        estimated_foreground = FB_blur_fusion_foreground_estimator_gpu_2(image, mask, r=r)
+        
+        estimated_foreground = estimated_foreground.squeeze()
+        estimated_foreground = (estimated_foreground.mul(255.0)).to(torch.uint8)
+        estimated_foreground = estimated_foreground.permute(1, 2, 0).contiguous().cpu().numpy().astype(np.uint8)
+    else:
+        image = np.array(image, dtype=np.float32) / 255.0
+        mask = np.array(mask, dtype=np.float32) / 255.0
+        estimated_foreground = FB_blur_fusion_foreground_estimator_cpu_2(image, mask, r=r)
+        estimated_foreground = (estimated_foreground * 255.0).astype(np.uint8)
+
+    estimated_foreground = Image.fromarray(np.ascontiguousarray(estimated_foreground))
+
+    return estimated_foreground
+
+
+class ImagePreprocessor():
+    def __init__(self, resolution: Tuple[int, int] = (1024, 1024)) -> None:
+        # Input resolution is on WxH.
+        self.transform_image = transforms.Compose([
+            transforms.Resize(resolution[::-1]),
+            transforms.ToTensor(),
+            transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]),
+        ])
+
+    def proc(self, image: Image.Image) -> torch.Tensor:
+        image = self.transform_image(image)
+        return image
+
+
+usage_to_weights_file = {
+    'General': 'BiRefNet',
+    'General-HR': 'BiRefNet_HR',
+    'Matting-HR': 'BiRefNet_HR-matting',
+    'Matting': 'BiRefNet-matting',
+    'Portrait': 'BiRefNet-portrait',
+    'General-reso_512': 'BiRefNet_512x512',
+    'General-Lite': 'BiRefNet_lite',
+    'General-Lite-2K': 'BiRefNet_lite-2K',
+    # 'Anime-Lite': 'BiRefNet_lite-Anime',
+    'DIS': 'BiRefNet-DIS5K',
+    'HRSOD': 'BiRefNet-HRSOD',
+    'COD': 'BiRefNet-COD',
+    'DIS-TR_TEs': 'BiRefNet-DIS5K-TR_TEs',
+    'General-legacy': 'BiRefNet-legacy',
+    'General-dynamic': 'BiRefNet_dynamic',
+    'Matting-dynamic': 'BiRefNet_dynamic-matting',
+}
+
+birefnet = transformers.AutoModelForImageSegmentation.from_pretrained('/'.join(('zhengpeng7', usage_to_weights_file['General'])), trust_remote_code=True)
+birefnet.to(device)
+birefnet.eval(); birefnet.half()
+
+
+@spaces.GPU
+def predict(images, resolution, weights_file):
+    assert (images is not None), 'AssertionError: images cannot be None.'
+
+    global birefnet
+    # Load BiRefNet with chosen weights
+    _weights_file = '/'.join(('zhengpeng7', usage_to_weights_file[weights_file] if weights_file is not None else usage_to_weights_file['General']))
+    print('Using weights: {}.'.format(_weights_file))
+    birefnet = transformers.AutoModelForImageSegmentation.from_pretrained(_weights_file, trust_remote_code=True)
+    birefnet.to(device)
+    birefnet.eval(); birefnet.half()
+
+    try:
+        resolution = [int(int(reso)//32*32) for reso in resolution.strip().split('x')]
+    except:
+        if weights_file in ['General-HR', 'Matting-HR']:
+            resolution = (2048, 2048)
+        elif weights_file in ['General-Lite-2K']:
+            resolution = (2560, 1440)
+        elif weights_file in ['General-reso_512']:
+            resolution = (512, 512)
+        else:
+            if '_dynamic' in weights_file:
+                resolution = None
+                print('Using the original size (div by 32) for inference.')
+            else:
+                resolution = (1024, 1024)
+        print('Invalid resolution input. Automatically changed to 1024x1024 / 2048x2048 / 2560x1440.')
+
+    if isinstance(images, list):
+        # For tab_batch
+        save_paths = []
+        save_dir = 'preds-BiRefNet'
+        if not os.path.exists(save_dir):
+            os.makedirs(save_dir)
+        tab_is_batch = True
+    else:
+        images = [images]
+        tab_is_batch = False
+
+    for idx_image, image_src in enumerate(images):
+        if isinstance(image_src, str):
+            if os.path.isfile(image_src):
+                image_ori = Image.open(image_src)
+            else:
+                response = requests.get(image_src)
+                image_data = BytesIO(response.content)
+                image_ori = Image.open(image_data)
+        else:
+            image_ori = Image.fromarray(image_src)
+
+        image = image_ori.convert('RGB')
+        # Preprocess the image
+        if resolution is None:
+            resolution_div_by_32 = [int(int(reso)//32*32) for reso in image.size]
+            if resolution_div_by_32 != resolution:
+                resolution = resolution_div_by_32
+        image_preprocessor = ImagePreprocessor(resolution=tuple(resolution))
+        image_proc = image_preprocessor.proc(image)
+        image_proc = image_proc.unsqueeze(0)
+
+        # Prediction
+        with torch.no_grad():
+            preds = birefnet(image_proc.to(device).half())[-1].sigmoid().cpu()
+        pred = preds[0].squeeze()
+
+        # Show Results
+        pred_pil = transforms.ToPILImage()(pred)
+        image_masked = refine_foreground(image, pred_pil, device=device)
+        image_masked.putalpha(pred_pil.resize(image.size))
+
+        torch.cuda.empty_cache()
+
+        if tab_is_batch:
+            save_file_path = os.path.join(save_dir, "{}.png".format(os.path.splitext(os.path.basename(image_src))[0]))
+            image_masked.save(save_file_path)
+            save_paths.append(save_file_path)
+
+    if tab_is_batch:
+        zip_file_path = os.path.join(save_dir, "{}.zip".format(save_dir))
+        with zipfile.ZipFile(zip_file_path, 'w') as zipf:
+            for file in save_paths:
+                zipf.write(file, os.path.basename(file))
+        return save_paths, zip_file_path
+    else:
+        return (image_masked, image_ori)
+
+
+examples = [[_] for _ in glob('examples/*')][:]
+# Add the option of resolution in a text box.
+for idx_example, example in enumerate(examples):
+    if 'My_' in example[0]:
+        example_resolution = '2048x2048'
+        model_choice = 'Matting-HR'
+    else:
+        example_resolution = '1024x1024'
+        model_choice = 'General'
+    examples[idx_example] = examples[idx_example] + [example_resolution, model_choice]
+
+examples_url = [
+    ['https://hips.hearstapps.com/hmg-prod/images/gettyimages-1229892983-square.jpg'],
+]
+for idx_example_url, example_url in enumerate(examples_url):
+    examples_url[idx_example_url] = examples_url[idx_example_url] + ['1024x1024', 'General']
+
+descriptions = ('Upload a picture, our model will extract a highly accurate segmentation of the subject in it.\n)'
+                 ' The resolution used in our training was `1024x1024`, which is the suggested resolution to obtain good results! `2048x2048` is suggested for BiRefNet_HR.\n'
+                 ' Our codes can be found at https://github.com/ZhengPeng7/BiRefNet.\n'
+                 ' We also maintain the HF model of BiRefNet at https://huggingface.co/ZhengPeng7/BiRefNet for easier access.')
+
+tab_image = gr.Interface(
+    fn=predict,
+    inputs=[
+        gr.Image(label='Upload an image'),
+        gr.Textbox(lines=1, placeholder="Type the resolution (`WxH`) you want, e.g., `1024x1024`.", label="Resolution"),
+        gr.Radio(list(usage_to_weights_file.keys()), value='General', label="Weights", info="Choose the weights you want.")
+    ],
+    outputs=gr.ImageSlider(label="BiRefNet's prediction", type="pil", format='png'),
+    examples=examples,
+    api_name="image",
+    description=descriptions,
+)
+
+tab_text = gr.Interface(
+    fn=predict,
+    inputs=[
+        gr.Textbox(label="Paste an image URL"),
+        gr.Textbox(lines=1, placeholder="Type the resolution (`WxH`) you want, e.g., `1024x1024`.", label="Resolution"),
+        gr.Radio(list(usage_to_weights_file.keys()), value='General', label="Weights", info="Choose the weights you want.")
+    ],
+    outputs=gr.ImageSlider(label="BiRefNet's prediction", type="pil", format='png'),
+    examples=examples_url,
+    api_name="URL",
+    description=descriptions+'\nTab-URL is partially modified from https://huggingface.co/spaces/not-lain/background-removal, thanks to this great work!',
+)
+
+tab_batch = gr.Interface(
+    fn=predict,
+    inputs=[
+        gr.File(label="Upload multiple images", type="filepath", file_count="multiple"),
+        gr.Textbox(lines=1, placeholder="Type the resolution (`WxH`) you want, e.g., `1024x1024`.", label="Resolution"),
+        gr.Radio(list(usage_to_weights_file.keys()), value='General', label="Weights", info="Choose the weights you want.")
+    ],
+    outputs=[gr.Gallery(label="BiRefNet's predictions"), gr.File(label="Download masked images.")],
+    api_name="batch",
+    description=descriptions+'\nTab-batch is partially modified from https://huggingface.co/spaces/NegiTurkey/Multi_Birefnetfor_Background_Removal, thanks to this great work!',
+)
+
+demo = gr.TabbedInterface(
+    [tab_image, tab_text, tab_batch],
+    ['image', 'URL', 'batch'],
+    title="Official Online Demo of BiRefNet",
+)
+
+if __name__ == "__main__":
+    demo.launch(debug=True, ssr_mode=False)