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Fix sft_prepare_dataset not removing original columns in non-packing path #477

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Merged
danielhanchen merged 1 commit into from
Feb 9, 2026
Merged

Fix sft_prepare_dataset not removing original columns in non-packing path #477

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2 changes: 1 addition & 1 deletion unsloth_zoo/dataset_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -669,7 +669,7 @@ def _tokenize(example):
map_kwargs["batch_size"] = dataset._ex_iterable.batch_size

if use_desc: map_kwargs["desc"] = f'Unsloth: Tokenizing ["{dataset_text_field}"]'
dataset = dataset.map(_tokenize, batched = True, **map_kwargs)
dataset = dataset.map(_tokenize, batched = True, remove_columns = list(column_names), **map_kwargs)

# If VLM, switch data collator since .pad is needed!
if is_vlm and not hasattr(processing_class, "pad"):
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