add application file

app.py

@@ -0,0 +1,69 @@
+from pathlib import Path
+import torch
+import gradio as gr
+from torch import nn
+import cv2
+import numpy as np
+
+BASE_DIR = Path(__file__).parent
+LABELS = (BASE_DIR / "class_names.txt").read_text().splitlines()
+
+model = nn.Sequential(
+    nn.Conv2d(1, 32, 3, padding="same"),
+    nn.ReLU(),
+    nn.MaxPool2d(2),
+    nn.Conv2d(32, 64, 3, padding="same"),
+    nn.ReLU(),
+    nn.MaxPool2d(2),
+    nn.Conv2d(64, 128, 3, padding="same"),
+    nn.ReLU(),
+    nn.MaxPool2d(2),
+    nn.Flatten(),
+    nn.Linear(1152, 256),
+    nn.ReLU(),
+    nn.Linear(256, len(LABELS)),
+)
+state_dict = torch.load(BASE_DIR /"pytorch_model.bin", map_location="cpu")
+model.load_state_dict(state_dict, strict=False)
+model.eval()
+
+
+def predict(im):
+    # 检查是否为空画布
+    if isinstance(im, dict):
+        # 空画布
+        if "layers" in im and (not im["layers"]):
+            return {"请先在画板上画图": 1.0}
+        # 优先用composite
+        if "composite" in im and im["composite"] is not None:
+            im = im["composite"]
+        # 否则用layers[0]
+        elif "layers" in im and isinstance(im["layers"], list) and len(im["layers"]) > 0:
+            im = im["layers"][0]
+        else:
+            return {"无法识别输入": 1.0}
+    # 转为numpy数组
+    im = np.array(im)
+    # 只取第一个通道（灰度）
+    if im.ndim == 3:
+        im = im[..., 0]
+        # resize 到模型训练时的尺寸（假设24x24）
+    im = cv2.resize(im, (24, 24), interpolation=cv2.INTER_AREA)
+    x = torch.tensor(im, dtype=torch.float32).unsqueeze(0).unsqueeze(0) / 255.0
+    with torch.no_grad():
+        out = model(x)
+    probabilities = torch.nn.functional.softmax(out[0], dim=0)
+    values, indices = torch.topk(probabilities, 5)
+    return {LABELS[i]: v.item() for i, v in zip(indices, values)}
+
+interface = gr.Interface(
+    predict,
+    inputs="sketchpad",
+    outputs="label",
+    # theme="huggingface",
+    title="Sketch Recognition",
+    description="Who wants to play Pictionary? Draw a common object like a shovel or a laptop, and the algorithm will guess in real time!",
+    article="<p style='text-align: center'>Sketch Recognition | Demo Model</p>",
+    # live=True,
+)
+interface.launch(share=True)