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app.py

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+from PIL import Image
+
+import torch
+
+from transformers import (
+    AutoImageProcessor,
+    AutoModelForImageClassification,
+)
+
+import gradio as gr
+import spaces  # ZERO GPU
+
+
+MODEL_NAMES = ["p1atdev/wd-swinv2-tagger-v3-hf"]
+MODEL_NAME = MODEL_NAMES[0]
+
+model = AutoModelForImageClassification.from_pretrained(
+    MODEL_NAME,
+)
+model.to("cuda" if torch.cuda.is_available() else "cpu")
+processor = AutoImageProcessor.from_pretrained(MODEL_NAME, trust_remote_code=True)
+
+
+def _people_tag(noun: str, minimum: int = 1, maximum: int = 5):
+    return (
+        [f"1{noun}"]
+        + [f"{num}{noun}s" for num in range(minimum + 1, maximum + 1)]
+        + [f"{maximum+1}+{noun}s"]
+    )
+
+
+PEOPLE_TAGS = (
+    _people_tag("girl") + _people_tag("boy") + _people_tag("other") + ["no humans"]
+)
+RATING_MAP = {
+    "general": "safe",
+    "sensitive": "sensitive",
+    "questionable": "nsfw",
+    "explicit": "explicit, nsfw",
+}
+
+DESCRIPTION_MD = """
+# WD Tagger with 🤗 transformers
+Currently supports the following model(s):
+- [p1atdev/wd-swinv2-tagger-v3-hf](https://huggingface.co/p1atdev/wd-swinv2-tagger-v3-hf)
+
+""".strip()
+
+
+def postprocess_results(
+    results: dict[str, float], general_threshold: float, character_threshold: float
+):
+    results = {
+        k: v for k, v in sorted(results.items(), key=lambda item: item[1], reverse=True)
+    }
+
+    rating = {}
+    character = {}
+    general = {}
+
+    for k, v in results.items():
+        if k.startswith("rating:"):
+            rating[k.replace("rating:", "")] = v
+            continue
+        elif k.startswith("character:"):
+            character[k.replace("character:", "")] = v
+            continue
+
+        general[k] = v
+
+    character = {k: v for k, v in character.items() if v >= character_threshold}
+    general = {k: v for k, v in general.items() if v >= general_threshold}
+
+    return rating, character, general
+
+
+def animagine_prompt(rating: list[str], character: list[str], general: list[str]):
+    people_tags: list[str] = []
+    other_tags: list[str] = []
+    rating_tag = RATING_MAP[rating[0]]
+
+    for tag in general:
+        if tag in PEOPLE_TAGS:
+            people_tags.append(tag)
+        else:
+            other_tags.append(tag)
+
+    all_tags = people_tags + character + other_tags + [rating_tag]
+
+    return ", ".join(all_tags)
+
+
+@spaces.GPU(enable_queue=True)
+def predict_tags(
+    image: Image.Image, general_threshold: float = 0.3, character_threshold: float = 0.8
+):
+    inputs = processor.preprocess(image, return_tensors="pt")
+
+    outputs = model(**inputs.to(model.device, model.dtype))
+    logits = torch.sigmoid(outputs.logits[0])  # take the first logits
+
+    # get probabilities
+    results = {
+        model.config.id2label[i]: float(logit.float()) for i, logit in enumerate(logits)
+    }
+
+    # rating, character, general
+    rating, character, general = postprocess_results(
+        results, general_threshold, character_threshold
+    )
+
+    prompt = animagine_prompt(
+        list(rating.keys()), list(character.keys()), list(general.keys())
+    )
+
+    return rating, character, general, prompt
+
+
+def demo():
+    with gr.Blocks() as ui:
+        gr.Markdown(DESCRIPTION_MD)
+
+        with gr.Row():
+            with gr.Column():
+                input_image = gr.Image(label="Input image", type="pil")
+
+                with gr.Group():
+                    general_threshold = gr.Slider(
+                        label="Threshold",
+                        minimum=0.0,
+                        maximum=1.0,
+                        value=0.3,
+                        step=0.01,
+                        interactive=True,
+                    )
+                    character_threshold = gr.Slider(
+                        label="Character threshold",
+                        minimum=0.0,
+                        maximum=1.0,
+                        value=0.8,
+                        step=0.01,
+                        interactive=True,
+                    )
+
+                _model_radio = gr.Dropdown(
+                    choices=MODEL_NAMES,
+                    label="Model",
+                    value=MODEL_NAMES[0],
+                    interactive=True,
+                )
+
+                start_btn = gr.Button(value="Start", variant="primary")
+
+            with gr.Column():
+                prompt_text = gr.Text(label="Prompt")
+
+                rating_tags_label = gr.Label(label="Rating tags")
+                character_tags_label = gr.Label(label="Character tags")
+                general_tags_label = gr.Label(label="General tags")
+
+        start_btn.click(
+            predict_tags,
+            inputs=[input_image, general_threshold, character_threshold],
+            outputs=[
+                rating_tags_label,
+                character_tags_label,
+                general_tags_label,
+                prompt_text,
+            ],
+        )
+
+    return ui
+
+
+if __name__ == "__main__":
+    demo().queue().launch()

requirements.txt

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+torch
+torchvision
+accelerate
+transformers==4.38.2
+spaces