fix: resolve all pre-commit checks

- Fix UP038: update isinstance calls to use X | Y syntax (Python 3.10+)
- Fix trailing whitespace in README.md
- Fix end-of-file issues in dataset and config files
- Re-add UP038 to ignore list in pyproject.toml for compatibility

Author: Harahan

README.md

@@ -452,7 +452,7 @@ GenRL is built upon the excellent work of the open-source community. We would li
 
 ## 📄 License
 
-GenRL is licensed under the **Apache License 2.0**.  
+GenRL is licensed under the **Apache License 2.0**.
 See `LICENSE.txt` for the full license text.
 
 ---

datasets/ocr/test.txt

@@ -1015,4 +1015,4 @@ A detailed, vintage-style alien abduction pamphlet titled "Probing FAQs", featur
 A realistic classroom scene with a large clock on the wall, its face reading "Time for Lunch", surrounded by desks and chairs, with sunlight streaming through windows, creating a warm, inviting atmosphere.
 In a dimly lit sci-fi prison cell, the cold metal walls are marked with graffiti scrawling "Escape Pod 9 Works" in bold, glowing letters, casting eerie shadows in the narrow, futuristic corridor.
 A futuristic spaceship cockpit with a digital screen displaying "Fuel Low" warning, set against the backdrop of a star-studded galaxy, with control panels and futuristic interfaces around.
-A futuristic spaceship with sleek, metallic exterior hull markings that boldly spell "Mars Colony One" under the glow of distant stars, set against the dark vastness of space.
+A futuristic spaceship with sleek, metallic exterior hull markings that boldly spell "Mars Colony One" under the glow of distant stars, set against the dark vastness of space.

datasets/ocr/train.txt

@@ -19650,4 +19650,4 @@ A skyscraper window cleaner's bucket, labeled "Fearless Cleaner", dangles precar
 A dimly lit prison cell with worn, gray stone walls. In the center, a single flickering bulb casts shadows. On the wall, deeply scratched in bold letters, reads "Innocent 423", illuminated by the faint light.
 An ice rink rental counter with a sign that reads "Skate Size 8 Available", surrounded by neatly arranged ice skates and happy skaters in the background, captured in a crisp, realistic photograph.
 A close-up of an elevator inspection certificate, prominently displaying "Last Check 2023", attached to a modern elevator door with a sleek, metallic finish. The certificate is slightly weathered, with a faint watermark, enhancing its authenticity.
-A close-up of a wizard's hat with a tag that reads "Sorting Hat Model 20", set against a magical, dimly lit backdrop with floating candles and mystical smoke swirling around it.
+A close-up of a wizard's hat with a tag that reads "Sorting Hat Model 20", set against a magical, dimly lit backdrop with floating candles and mystical smoke swirling around it.

genrl/diffusers_patch/wan_pipeline_with_logprob.py

@@ -191,7 +191,7 @@ def wan_pipeline_with_logprob(
 ):
     if callback_on_step_end_tensor_inputs is None:
         callback_on_step_end_tensor_inputs = ["latents"]
-    if isinstance(callback_on_step_end, (PipelineCallback, MultiPipelineCallbacks)):
+    if isinstance(callback_on_step_end, PipelineCallback | MultiPipelineCallbacks):
         callback_on_step_end_tensor_inputs = callback_on_step_end.tensor_inputs
 
     self.check_inputs(

genrl/reward/hpsv3.py

@@ -41,7 +41,7 @@ def set_hpsv3_device(device) -> None:
 
 
 def _extract_reward_scalar(reward) -> float:
-    if isinstance(reward, (list, tuple)) and len(reward) > 0:
+    if isinstance(reward, list | tuple) and len(reward) > 0:
         return float(reward[0])
     if isinstance(reward, torch.Tensor):
         if reward.numel() == 0:

genrl/trainer/base_trainer.py

@@ -260,7 +260,7 @@ def log_metrics(
                 # Handle Python native types (int, float)
                 # Note: numpy.float64 is a subclass of float, but has dtype attribute
                 # numpy.int64 is NOT a subclass of int, and has dtype attribute
-                elif isinstance(value, (int, float)) and not hasattr(value, "dtype"):
+                elif isinstance(value, int | float) and not hasattr(value, "dtype"):
                     scalar_items[key] = float(value)
                 # Handle numpy scalars (numpy.int64, numpy.float64, etc.)
                 # numpy scalars have .item() method and .dtype attribute

pyproject.toml

@@ -6,6 +6,7 @@ extend-exclude = ["genrl/reward/VideoAlign", "genrl/reward/HPSv3"]
 [tool.ruff.lint]
 select = ["E", "F", "W", "I", "N", "UP", "B", "C4", "DTZ", "T10", "EM", "ISC", "ICN", "PIE", "T20", "PYI", "PT", "Q", "RSE", "RET", "SIM", "ARG", "PTH", "ERA", "PD", "PGH", "PL", "TRY", "NPY", "RUF"]
 ignore = [
+    "UP038",  # isinstance doesn't support X | Y syntax in older versions
     "PTH",  # Prefer pathlib over os.path (too many changes needed)
     "PLR0913",  # Too many arguments (acceptable for complex functions)
     "PLR0912",  # Too many branches (acceptable for complex logic)