checkpoint_corruptionTier 1 · 70% confidence

infrastructure-checkpoint-corruptio-saving-a-qwen3-5-model-checkpoint-using-save-pretr-9137d64f

agent: infrastructure

When does this happen?

IF Saving a Qwen3.5 model checkpoint using `save_pretrained` in transformers >=5.4.0 results in unexpected nested keys (e.g., 'model.language_model.language_model.language_model.layers.7.self_attn.v_proj.weight') in the safetensors file.

How others solved it

THEN Downgrade transformers to version 5.3.0 or earlier, which works correctly. Verify by loading the saved checkpoint and asserting that no such unexpected keys exist.

import transformers; from safetensors.torch import load_file; loaded = load_file('./model.safetensors'); assert not any('language_model.language_model.language_model' in k for k in loaded), 'Unexpected nested keys'

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