[API Compatibility] CN doc

[algorithm1832]

• paddle.autograd.PyLayerContext.saved_tensors
• paddle.autograd.function.FunctionCtx
• paddle.autograd.function.once_differentiable
• paddle.optimizer.Optimizer.step
• paddle.random.get_rng_state
• paddle.random.set_rng_state
• paddle.utils.data.BatchSampler
• paddle.utils.data.ChainDataset
• paddle.utils.data.ConcatDataset
• paddle.utils.data.Dataset
• paddle.utils.data.IterableDataset
• paddle.utils.data.RandomSampler
• paddle.utils.data.Sampler
• paddle.utils.data.SequentialSampler
• paddle.utils.data.Subset
• paddle.utils.data.default_collate
• paddle.utils.data.get_worker_info
• paddle.utils.data.random_split
• Tensor.is_cpu
• Tensor.numpy
• Tensor.cuda
• Tensor.fill_diagonal_
• Tensor.nelement

---

Additional:

• fix from_dlpack and to_dlpack incorrect label in paddle.utils doc (Related [DLPack] Add new parameters for from_dlpack and move from_dlpack/to_dlpack to top level #7436)

[paddle-bot]

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[github-actions]

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[zhwesky2010]

LGTM

[zhwesky2010]

2026-04-27 13:49:35 2026-04-27 05:49:35,562 - run_cn_api_label_checking:100 - ERROR - Found api label cn_api_paddle_autograd_function_FunctionCtx in /FluidDoc/docs//api/paddle/autograd/Overview_cn.rst, but it is not a valid api label, please re-check it!

[sunzhongkai588]

LGTM