--- title: "accelerate Breaking Changes on PyPI | Since.dev" description: "What each accelerate release removed, renamed or changed: 242 breaking changes in 10 versions on PyPI, each with its source." canonical_url: https://since.dev/packages/pypi/accelerate last_updated: 2026-09-09 --- # accelerate breaking changes Every breaking API change we have recorded in accelerate on PyPI: 242 breaking changes in 10 versions. Below are its newest 6 versions, removals and renames first, each with its source. Newest change September 9, 2026 ## 1.15.0 33 breaking changes, first published September 9, 2026. - **Removed** `accelerate.utils.launch.parse_flag_from_env` accelerate.utils.launch.parse_flag_from_env was removed in accelerate 1.15.0 [pypi.org](https://pypi.org/project/accelerate/1.15.0/) - **Behavior changed** SHARDED_STATE_DICT checkpoints under FSDP2 now use per-rank torch.save and torch.load. Code that reads or writes these checkpoints directly must account for the per-rank files. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.15.0) - **Behavior changed** Activation checkpointing under FSDP2 now wraps the matched transformer layer itself rather than each child module. Memory use and recomputation change as a result. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.15.0) - **Behavior changed** Enabling FSDP on a device mesh without a shard dimension now raises a clear error. Setups that previously ran this way must add a shard dimension to the mesh. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.15.0) - **Behavior changed** Context parallelism now raises an error for models that have sliding-window or chunked attention layers. Such models must run without context parallelism. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.15.0) - **Behavior changed** `prepare_model` prepare_model leaves models already sharded with DTensor where they are instead of moving them to the device. Code that relied on the move must place the model itself. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.15.0) - **Signature changed** `accelerate.accelerator.convert_model_to_fp8_ao` Was def convert_model_to_fp8_ao(model: torch.nn.Module, config: Optional\[Float8LinearConfig\] = None, module_filter_func: Optional\[Callable\] = filter_first_and_last_linear_layers); now def convert_model_to_fp8_ao(model: torch.nn.Module... [pypi.org](https://pypi.org/project/accelerate/1.15.0/) - **Signature changed** `accelerate.accelerator.DataLoaderDispatcher.__init__` Was def \_\_init\_\_(self, dataset, split_batches: bool = False, skip_batches=0, use_stateful_dataloader=False, \_drop_last: bool = False, \_non_blocking: bool = False, slice_fn=None, torch_device_mesh=None, \*\*kwargs); now def \_\_init\_\_(self... [pypi.org](https://pypi.org/project/accelerate/1.15.0/) - **Signature changed** `accelerate.accelerator.load_accelerator_state` Was def load_accelerator_state(input_dir, models, optimizers, schedulers, dataloaders, process_index, scaler=None, map_location=None, load_kwargs=None, \*\*load_model_func_kwargs); now def load_accelerator_state(input_dir: str, models: list... [pypi.org](https://pypi.org/project/accelerate/1.15.0/) - **Signature changed** `accelerate.accelerator.load_custom_state` Was def load_custom_state(obj, path, index: int = 0); now def load_custom_state(obj, path: str, index: int = 0) -> None. [pypi.org](https://pypi.org/project/accelerate/1.15.0/) And 23 more in this version. ## 1.14.0 7 breaking changes, first published June 11, 2026. - **Default changed** `tracker.log` The tracker log method's step parameter defaults to None instead of its previous default. Code that relies on the old default step value should pass step explicitly. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.14.0) - **Signature changed** `accelerate.accelerator.GeneralTracker.log` Was def log(self, values: dict, step: Optional\[int\], \*\*kwargs); now def log(self, values: dict, step: Optional\[int\] = None, \*\*kwargs). [pypi.org](https://pypi.org/project/accelerate/1.14.0/) - **Signature changed** `accelerate.Accelerator.init_trackers` Was def init_trackers(self, project_name: str, config: dict | None = None, init_kwargs: dict | None = {}); now def init_trackers(self, project_name: str, config: dict | None = None, init_kwargs: dict | None = None). [pypi.org](https://pypi.org/project/accelerate/1.14.0/) - **Signature changed** `accelerate.Accelerator.log` Was def log(self, values: dict, step: int | None = None, log_kwargs: dict | None = {}); now def log(self, values: dict, step: int | None = None, log_kwargs: dict | None = None). [pypi.org](https://pypi.org/project/accelerate/1.14.0/) - **Signature changed** `accelerate.tracking.MLflowTracker.log` Was def log(self, values: dict, step: Optional\[int\]); now def log(self, values: dict, step: Optional\[int\] = None, \*\*kwargs). [pypi.org](https://pypi.org/project/accelerate/1.14.0/) - **Signature changed** `accelerate.tracking.TensorBoardTracker.log_images` Was def log_images(self, values: dict, step: Optional\[int\], \*\*kwargs); now def log_images(self, values: dict, step: Optional\[int\] = None, \*\*kwargs). [pypi.org](https://pypi.org/project/accelerate/1.14.0/) - **Signature changed** `accelerate.utils.fsdp_utils.fsdp2_prepare_auto_wrap_policy` Was def fsdp2_prepare_auto_wrap_policy(fsdp2_plugin, model: torch.nn.Module) -> Callable\[\[torch.nn.Module\], bool\]; now def fsdp2_prepare_auto_wrap_policy(fsdp2_plugin, model: torch.nn.Module) -> Callable\[\[torch.nn.Module\], bool\] | None. [pypi.org](https://pypi.org/project/accelerate/1.14.0/) ## 1.13.0 36 breaking changes, first published March 4, 2026. - **Removed** Accelerate no longer depends on Intel Extension for PyTorch (IPEX) for XPU support. Code and environments that relied on IPEX being installed may need to change. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.13.0) - **Removed** `accelerate.accelerator.AcceleratorState.use_ipex` AcceleratorState.use_ipex was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.accelerator.DynamoBackend.IPEX` accelerate.accelerator.DynamoBackend.IPEX was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.accelerator.is_ipex_available` accelerate.accelerator.is_ipex_available was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.accelerator.MegatronEngine.megatron_generate` MegatronEngine.megatron_generate was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.commands.config.cluster.ClusterConfig.ipex_config` ClusterConfig.ipex_config was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.commands.config.config_utils.DynamoBackend.IPEX` accelerate.commands.config.config_utils.DynamoBackend.IPEX was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.state.DynamoBackend.IPEX` accelerate.state.DynamoBackend.IPEX was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.state.is_ccl_available` accelerate.state.is_ccl_available was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) - **Removed** `accelerate.state.is_ipex_available` accelerate.state.is_ipex_available was removed in accelerate 1.13.0 [pypi.org](https://pypi.org/project/accelerate/1.13.0/) And 26 more in this version. ## 1.12.0 1 breaking change, first published November 21, 2025. - **Signature changed** `accelerate.ParallelismConfig.__init__` Was def \_\_init\_\_(self, dp_replicate_size: Optional\[int\] = None, dp_shard_size: Optional\[int\] = None, tp_size: Optional\[int\] = None, cp_size: Optional\[int\] = None, tp_handler: Union\[None, TorchTensorParallelConfig\] = None, cp_handler... [pypi.org](https://pypi.org/project/accelerate/1.12.0/) ## 1.11.0 87 breaking changes, first published October 20, 2025. - **Removed** Python 3.9 reached end of life and is no longer supported; users on Python 3.9 must upgrade to Python 3.10 or later. [github.com](https://github.com/huggingface/accelerate/releases/tag/v1.11.0) - **Removed** `accelerate.test_utils.RegressionModel4XPU` accelerate.test_utils.RegressionModel4XPU was removed in accelerate 1.11.0 [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Removed** `accelerate.test_utils.scripts.external_deps.test_ds_multiple_model.MAX_GPU_BATCH_SIZE` accelerate.test_utils.scripts.external_deps.test_ds_multiple_model.MAX_GPU_BATCH_SIZE was removed in accelerate 1.11.0 [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Removed** `accelerate.test_utils.scripts.test_script.is_xpu_available` accelerate.test_utils.scripts.test_script.is_xpu_available was removed in accelerate 1.11.0 [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Removed** `accelerate.utils.modeling.FindTiedParametersResult` The previously deprecated FindTiedParametersResult was removed; code that imports or uses it will fail. [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Renamed** `accelerate.test_utils.scripts.test_ops.test_gather_non_contigous` Use accelerate.test_utils.scripts.test_ops.test_gather_non_contiguous instead. [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Signature changed** `accelerate.accelerator.AcceleratorState.__init__` Was def \_\_init\_\_(self, mixed_precision: str = None, cpu: bool = False, dynamo_plugin=None, deepspeed_plugin=None, fsdp_plugin=None, torch_tp_plugin=None, megatron_lm_plugin=None, parallelism_config=None, \_from_accelerator: bool = False... [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Signature changed** `accelerate.accelerator.AcceleratorState.select_deepspeed_plugin` Was def select_deepspeed_plugin(self, name: str = None); now def select_deepspeed_plugin(self, name: str | None = None). [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Signature changed** `accelerate.accelerator.filter_trackers` Was def filter_trackers(log_with: list\[Union\[str, LoggerType, GeneralTracker\]\], logging_dir: Union\[str, os.PathLike\] = None); now def filter_trackers(log_with: list\[Union\[str, LoggerType, GeneralTracker\]\], logging_dir: Optional\[Union\[str... [pypi.org](https://pypi.org/project/accelerate/1.11.0/) - **Signature changed** `accelerate.accelerator.FP8RecipeKwargs.__init__` Was def \_\_init\_\_(self, opt_level: OptLevel = None, use_autocast_during_eval: bool = None, margin: int = None, interval: int = None, fp8_format: FP8Format = None, amax_history_len: int = None, amax_compute_algo: AmaxComputeAlgorithm = None... [pypi.org](https://pypi.org/project/accelerate/1.11.0/) And 77 more in this version. ## 1.10.0 39 breaking changes, first published August 7, 2025. - **Removed** `accelerate.accelerator.BETA_TP_AVAILABLE_PYTORCH_VERSION` accelerate.accelerator.BETA_TP_AVAILABLE_PYTORCH_VERSION was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.accelerator.BETA_TP_AVAILABLE_TRANSFORMERS_VERSION` accelerate.accelerator.BETA_TP_AVAILABLE_TRANSFORMERS_VERSION was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.accelerator.DistributedType.TP` accelerate.accelerator.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.accelerator.TorchTensorParallelPlugin.__post_init__` TorchTensorParallelPlugin.\_\_post_init\_\_ was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.commands.config.cluster.DistributedType.TP` accelerate.commands.config.cluster.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.commands.config.config_args.DistributedType.TP` accelerate.commands.config.config_args.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.commands.config.config_utils.DistributedType.TP` accelerate.commands.config.config_utils.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.commands.launch.DistributedType.TP` accelerate.commands.launch.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.data_loader.DistributedType.TP` accelerate.data_loader.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) - **Removed** `accelerate.DistributedType.TP` accelerate.DistributedType.TP was removed in accelerate 1.10.0 [pypi.org](https://pypi.org/project/accelerate/1.10.0/) And 29 more in this version. ## Check your code These are the changes. To see which of them reach your code, [scan a public repository](https://since.dev/scan.md), or have your coding agent call `check_code` with your manifest or lockfile over [MCP](https://since.dev/docs.md#mcp). [The API](https://since.dev/docs.md#api) reads every change in every version, not only the newest. On Team and up, a fix pull request opens for the changes that reach a connected repository. Nothing merges or deploys. ## Put your code on continuous management. Scan a public repository now, or give your agent one line. ### See how out of date your code is. [Scan a repository](https://since.dev/scan.md). Any public GitHub repository. No sign-in. ### Tell your agent what changed since it was trained. `claude mcp add --transport http since https://api.since.dev/mcp` --- Every page on this site as Markdown: https://since.dev/sitemap.md. For agents: https://since.dev/llms.txt.