Warn when group_by_length is silently ignored for iterable datasets#47379
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SunMarc
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Jul 21, 2026
SangbumChoi
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* upstream/main: (39 commits) Remove deprecated training args and `is_fast` property (huggingface#46917) Consistent output shape from `get_image_features` (huggingface#46405) Fix multi-device mxfp4 dequantization race in `_convert_moe_packed_tensors` (huggingface#47423) fix failed test cases for qwen3_omni_moe model (huggingface#47449) Fix Hunyuan-VL PIL image resize parity with reference preprocessing (huggingface#47233) Move `value` padding into the attention interfaces that need it (huggingface#47451) Simplify function dispatch for linear attention (huggingface#47450) [cache] Allow sliding window layers to be roll-backed for speculative decoding (huggingface#47447) Fix double-shifted training loss in GitForCausalLM (huggingface#47395) Fix CohereASR training-loss double-shift (same as Moonshine fix huggingface#46784) (huggingface#46895) Warn when `group_by_length` is silently ignored for iterable datasets (huggingface#47379) Update bug report list (huggingface#46607) Fix shape mismatch in KyutaiSpeechToText `generate()` last window (huggingface#46952) Optimize flash attention max seqlen computation in vision attention (huggingface#47170) fix: remove unreachable return in special token builder (huggingface#47420) Add Harry to slow CI (huggingface#47454) BLT: vectorize patch length processing (huggingface#47385) Fix `TrackioCallback` fails to log evaluation metrics after training ends (huggingface#46935) [Kimi] add integration tests (huggingface#47383) Fix typo in `MusicgenForCausalLM.generate()` (huggingface#46974) ...
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train_sampling_strategy="group_by_length"has no effect on datasets without__len__(e.g.IterableDataset):_get_train_samplerreturnsNoneearly, and examples are consumed in the dataset's own order. This used to raise aValueError(#15437), but the check was dropped in the sampler unification refactor (#43138), so it now fails silently.This adds a warning on that path. No behavior change otherwise; a warning rather than restoring the error, since users relying on the current no-op shouldn't break.
Fixes the silent-no-op part of #32326; the feature request itself (buffer-based length grouping for streaming datasets) is out of scope here.