Cleanup: unused imports, encoding docstring/assert, Docker diffusers pin (#409)

* fix: encoding docstring/mime + assert, Docker diffusers pin

- media_to_bytes docstring claimed PNG/AVI and 'image/png'/'video/avi';
  the code JPEG-encodes images and MP4-encodes video. Corrected.
- video_to_bytes used 'assert video.max() <= 1.0' for input validation,
  which is stripped under python -O; replaced with a ValueError.
- Dockerfile installed diffusers from git master on top of the pinned
  diffusers==0.36.0, so Docker validators ran a different diffusers than
  bare-metal (install.sh) and the lockfile. Dropped the git override;
  0.36.0 is already installed via 'uv pip install -e .'. Janus and CLIP
  stay on git (not available as suitable PyPI releases).

* chore: prune unused imports; declare __init__ re-exports in __all__

- ruff --fix removed 64 unused imports across gas/ and neurons/ module
  bodies (no behavior change; F401).
- The four package __init__.py files re-export public API but had no
  __all__, so those imports read as 'unused'. Added explicit __all__
  lists (verified against F822) — documents the public surface and lets
  ruff's default rules run clean.

Also deleted untracked working-tree litter (cli.py copy, #VEr#,
verification_ideass.txt, pr_description.md, stale emacs autosave).

Author: dylanuys

Dockerfile

@@ -52,7 +52,6 @@ RUN uv pip install setuptools && \
     uv pip install -e . && \
     uv pip install --no-build-isolation \
         git+https://github.com/deepseek-ai/Janus.git \
-        git+https://github.com/huggingface/diffusers \
         git+https://github.com/openai/CLIP.git
 
 # ---------------------------------------------------------------------------

gas/cache/db/media_store.py

@@ -8,7 +8,7 @@
 
 import bittensor as bt
 
-from gas.cache.types import ChallengeOutcome, PromptEntry, MediaEntry
+from gas.cache.types import MediaEntry
 from gas.types import Modality, MediaType, SourceType, SOURCE_TYPE_TO_DB_NAME_FIELD
 from gas.cache.db.connection import ConnectionManager
 from gas.cache.db.prompt_store import PromptStore

gas/cache/db/prompt_store.py

@@ -3,7 +3,7 @@
 import re
 import time
 import uuid
-from typing import List, Dict, Optional, Tuple, Any
+from typing import List, Optional
 
 import bittensor as bt
 

gas/cache/media_storage.py

@@ -1,13 +1,10 @@
-import json
-import random
 import time
 import uuid
 from typing import Dict, Any, Optional, List
 from pathlib import Path
 
 import cv2
 import numpy as np
-from PIL import Image
 from diffusers.utils import export_to_video
 
 from gas.cache.util.video import sample_frames

gas/cache/types.py

@@ -1,8 +1,7 @@
 from dataclasses import dataclass, asdict
-from typing import Dict, Any, Optional, List
+from typing import Dict, Any, Optional
 import numpy as np
 import time
-import uuid
 
 from gas.types import Modality, MediaType, SourceType
 

gas/cache/util/filesystem.py

@@ -8,7 +8,7 @@
 import bittensor as bt
 import pyarrow.parquet as pq
 
-from gas.types import FileType, MediaType, Modality
+from gas.types import Modality
 
 
 def get_most_recent_update_time(directory: Path) -> float:

gas/cache/util/miner_stats.py

@@ -15,7 +15,7 @@
 import sys
 import time
 from collections import defaultdict
-from datetime import datetime, timezone
+from datetime import datetime
 from pathlib import Path
 
 

gas/datasets/__init__.py

@@ -2,4 +2,10 @@
     load_all_datasets,
     get_image_datasets,
     get_video_datasets,
-)
+)
+
+__all__ = [
+    "load_all_datasets",
+    "get_image_datasets",
+    "get_video_datasets",
+]

gas/datasets/datasets.py

@@ -3,7 +3,7 @@
 """
 
 from typing import List
-from gas.types import DatasetConfig, MediaType, Modality
+from gas.types import DatasetConfig
 from gasbench.dataset.config import load_benchmark_datasets_from_yaml
 
 

gas/datasets/download.py

@@ -1,13 +1,9 @@
-import asyncio
 import base64
-import hashlib
-import json
 import random
 import os
 import traceback
 import tempfile
 import shutil
-from datetime import datetime
 from io import BytesIO
 from pathlib import Path
 from typing import List, Optional, Dict, Any, Generator, Tuple
@@ -16,13 +12,12 @@
 from contextlib import closing
 
 import bittensor as bt
-import numpy as np
 import pyarrow.parquet as pq
 from PIL import Image
 
 
 import requests
-from gas.types import Modality, MediaType, DatasetConfig
+from gas.types import Modality, DatasetConfig
 
 
 IMAGE_FILE_EXTENSIONS = {".jpg", ".jpeg", ".png", ".bmp", ".gif", ".tiff", ".webp"}