code/migration_notes.md

Common reasons Spaces that used to work now fail on rebuild. Spaces reinstalls unpinned dependencies at their latest versions on every rebuild, so old code meets new libraries.

gradio

• 4.0 removed gr.inputs.* / gr.outputs.* (use gr.Textbox, gr.Image, ...), .style(...), gr.Box (use gr.Group), gr.Variable (use gr.State), gr.Image(source=..., tool=...) (now sources=[...]).
• launch(enable_queue=...) and Interface(enable_queue=...) were removed; call .queue() instead.
• queue(concurrency_count=N) was removed in 4.0; use queue(default_concurrency_limit=N).
• Interface(allow_flagging=...) was renamed flagging_mode in 5.0.
• gr.update(...) in place of gr.Component.update(...) (the classmethod .update was removed in 4.0).
• 6.0 moved app-level options such as css from the Blocks/Interface constructor to launch() (gradio prints a UserWarning naming them), and allow_flagging is no longer accepted. Check the warning text in the log.
• Spaces whose README pins the newest sdk_version get gradio 6 even if the code was written for 3.x.
• In 5.x, gr.Chatbot defaults changed; tuple-format history is deprecated in favour of type="messages".
• Old gradio 3.x pins can break against newer huggingface_hub, httpx (0.28 removed proxies=), pydantic 2, fastapi/starlette, or jinja2. Either pin those transitive packages or bump sdk_version.
• gradio's audioop: Python 3.13 removed the stdlib audioop module; pydub falls back to pyaudioop. Fix: add audioop-lts to requirements (provides audioop on 3.13+) or pin python_version: "3.10".

huggingface_hub

• 1.0 removed cached_download (use hf_hub_download), HfFolder (use get_token / login), Repository (use HfApi.upload_* / snapshot_download), InferenceApi (use InferenceClient), and the use_auth_token= argument (use token=). Libraries that import these (old diffusers, old gradio, old sentence-transformers) need upgrading or huggingface_hub<1.0 pinned.

torch / torchvision

• torch 2.6 made torch.load(weights_only=True) the default; old checkpoints raise UnpicklingError / WeightsUnpickler error. For a checkpoint the Space author trusts, pass weights_only=False, or pin torch<2.6.
• torchvision 0.17 removed torchvision.transforms.functional_tensor (breaks basicsr, used by GFPGAN / Real-ESRGAN). Patch the import to torchvision.transforms.functional or pin torchvision<0.17.

numpy

• numpy 2 breaks extensions compiled against numpy 1 (numpy.core.multiarray failed to import, numpy.dtype size changed, _ARRAY_API not found). Pin numpy<2 unless the extensions are upgraded.
• np.float, np.int, np.bool, np.object were removed in 1.24; use the builtins.

others

• datasets 3/4 removed LargeList re-exports and changed loading scripts (trust_remote_code).
• openai 1.0 removed openai.ChatCompletion/openai.Completion (use the client object).
• transformers drops long-deprecated modules and kwargs; pin to the version era of the code if it fails on import.
• setuptools 80+ no longer provides pkg_resources in some setups; pin setuptools<81 if pkg_resources is missing.
• tomli: Python 3.11+ has tomllib; on 3.10 tomli must be installed explicitly if a package expects it.