Align task API and add FunCaptcha support

tests/test_generators.py

@@ -9,7 +9,14 @@ import re
 import pytest
 from PIL import Image
 
-from config import GENERATE_CONFIG, NORMAL_CHARS, MATH_CHARS, THREED_CHARS, SOLVER_CONFIG
+from config import (
+    GENERATE_CONFIG,
+    NORMAL_CHARS,
+    MATH_CHARS,
+    THREED_CHARS,
+    SOLVER_CONFIG,
+    SOLVER_REGRESSION_RANGE,
+)
 from generators import (
     NormalCaptchaGenerator,
     MathCaptchaGenerator,
@@ -67,6 +74,10 @@ class TestMathCaptchaGenerator:
         img, label = self.gen.generate()
         assert re.match(r"^\d+[+\-×÷]\d+$", label), f"unexpected label format: {label!r}"
 
+    def test_generate_with_division_text(self):
+        img, label = self.gen.generate(text="20÷4")
+        assert label == "20÷4"
+
 
 class TestThreeDCaptchaGenerator:
     def setup_method(self):
@@ -150,7 +161,25 @@ class TestSlideDataGenerator:
     def test_label_is_numeric(self):
         img, label = self.gen.generate()
         val = int(label)
-        assert val >= 0
+        gs = self.gen.gap_size
+        margin = gs + 10
+        assert margin + gs // 2 <= val <= self.gen.width - margin + gs // 2
+
+    def test_labels_normalize_inside_solver_range(self, tmp_path):
+        for idx in range(3):
+            img, label = self.gen.generate()
+            img.save(tmp_path / f"{label}_{idx:06d}.png")
+
+        from training.dataset import RegressionDataset
+
+        ds = RegressionDataset(
+            dirs=[tmp_path],
+            label_range=SOLVER_REGRESSION_RANGE["slide"],
+            transform=None,
+        )
+        assert len(ds.samples) == 3
+        for _, norm in ds.samples:
+            assert 0.0 < norm < 1.0
 
 
 class TestRotateSolverDataGenerator: