Trying to train and unsloth studio :One of the subprocesses has abruptly died during map operation. | Unsloth AI | Page 1

main raptor Mar 20, 2026, 8:38 PM

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Tried already to reinstall. But nothing helps

📎 message.txt

ripe prawn Mar 20, 2026, 8:55 PM

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Hello . we are aware of this problem and working on solving it

river mica Mar 21, 2026, 1:43 AM

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i have the same issue i believe

hazy nacelle Mar 22, 2026, 9:09 AM

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same issue here

river mica Mar 22, 2026, 10:09 PM

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imma try a different model and dataset today and see if its still happening on my end.

i was having errors with gemma3-270m and my csv based datasets

ripe prawn Mar 23, 2026, 5:09 AM

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@river mica what did your experiment lead to?

river mica Mar 23, 2026, 6:10 AM

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@ripe prawn same behaviour

ripe prawn Mar 23, 2026, 6:10 AM

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ok will investigate now

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can you tell me which version of unsloth do y ou have?

river mica Mar 23, 2026, 6:11 AM

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where can i find that?

ripe prawn Mar 23, 2026, 6:12 AM

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oh is there an unsloth_studio folder in the directory where you ran the installer?

river mica Mar 23, 2026, 6:16 AM

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yes

ripe prawn Mar 23, 2026, 6:17 AM

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then

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./unsloth_studio/bin/pip show unsloth

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if you're on linux (forgot)

river mica Mar 23, 2026, 6:19 AM

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2026.3.8

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im looking in C:\Users\User\unsloth_studio\Lib\site-packages right now

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im on windows btw

ripe prawn Mar 23, 2026, 6:19 AM

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oh ok 😄

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does it show num_proc = 1?

river mica Mar 23, 2026, 6:23 AM

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no? lol

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where am i looking to see that flag

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am i missing something thonk

ripe prawn Mar 23, 2026, 6:31 AM

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in the logs

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if you look at the log the first user shared

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you'll see this

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oh wait

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wait

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qwen3.5 right?

river mica Mar 23, 2026, 6:37 AM

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i tried unsloth/qwen3 0.6b

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hold

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it is num_proc = 1

ripe prawn Mar 23, 2026, 6:43 AM

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ok

ripe prawn Mar 23, 2026, 6:59 AM

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testing now

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do you know which dataset you tried with @river mica

river mica Mar 23, 2026, 7:47 AM

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@ripe prawn
databricks/databricks-dolly-15k

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grabbed it at random

ripe prawn Mar 23, 2026, 8:50 AM

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@river mica are you also getting ModuleNotFoundError: No module named 'UnslothSFTTrainer'

river mica Mar 23, 2026, 9:08 AM

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the only difference in the traceback is:
AttributeError: Can't get attribute 'unsloth_push_to_hub' on <module 'unsloth.save' from 'C:\\Users\\User\\.unsloth\\studio\\.venv\\Lib\\site-packages\\unsloth\\save.py'> Applying chat template to chatml_conversations (num_proc=1): 0%| | 0/15011 [00:26<?, ? examples/s] {"timestamp": "2026-03-23T08:54:48.175790Z", "level": "error", "event": "Dataset conversion failed: Failed to format ChatML dataset: One of the subprocesses has abruptly died during map operation.To debug the error, disable multiprocessing."} {"timestamp": "2026-03-23T08:54:48.175790Z", "level": "error", "event": "Training error: Failed to format ChatML dataset: One of the subprocesses has abruptly died during map operation.To debug the error, disable multiprocessing."}

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instead of ModuleNotFoundError ..

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from the first dude

ripe prawn Mar 23, 2026, 9:12 AM

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wait

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in which tab are you getting this?

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because this is what might be the actual problem: AttributeError: Can't get attribute 'unsloth_push_to_hub' on <module 'unsloth.save' from

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and was this lora training or full trainig

ripe prawn Mar 23, 2026, 11:19 AM

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@main raptor can you show me what this gives you C:\Users\andi\.unsloth\studio\.venv\bin\pip show datasets

river mica Mar 23, 2026, 6:26 PM

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ripe prawn in which tab are you getting this?

terminal

ripe prawn Mar 24, 2026, 5:40 AM

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river mica terminal

in which tab on the studio application

river mica Mar 24, 2026, 9:08 AM

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it was during qlora training*

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let me grab the error in studio

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i apologize for not being the most helpful here roland lol

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and the attribute error follows this in powershell

river mica Mar 24, 2026, 8:27 PM

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https://github.com/unslothai/unsloth/issues/4490

GitHub

[Monkey Fix] Windows: "One of the subprocesses has abruptly died du...

On Windows 11, every fine-tuning attempt (LoRA, QLoRA, Full) crashes at the tokenization step with: RuntimeError: One of the subprocesses has abruptly died during map operation. To debug the error,...

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have you seen this roland

main raptor Mar 28, 2026, 12:31 PM

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ripe prawn <@153124240839802880> can you show me what this gives you `C:\Users\andi\.unslot...

the folder .venv does not exist

ripe prawn Mar 28, 2026, 12:33 PM

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you probably updated

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so we removed .venv

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we now using unsloth_studio instead

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C:\Users\andi\.unsloth\studio\unsloth_studio\Scripts\pip show datasets

main raptor Mar 28, 2026, 12:36 PM

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Version: 4.3.0
Summary: HuggingFace community-driven open-source library of datasets
Home-page: https://github.com/huggingface/datasets
Author: HuggingFace Inc.
Author-email: [email protected]
License: Apache 2.0
Location: C:\Users\andi\.unsloth\studio\unsloth_studio\Lib\site-packages
Requires: dill, filelock, fsspec, httpx, huggingface-hub, multiprocess, numpy, packaging, pandas, pyarrow, pyyaml, requests, tqdm, xxhash
Required-by: evaluate, trl, unsloth, unsloth_zoo```

ripe prawn Mar 28, 2026, 12:40 PM

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mmm

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C:\Users\andi\.unsloth\studio\unsloth_studio\Scripts\pip show numpy

main raptor Mar 28, 2026, 1:38 PM

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Name: numpy
Version: 2.4.3
Summary: Fundamental package for array computing in Python
Home-page: https://numpy.org
Author: Travis E. Oliphant et al.
Author-email:
License-Expression: BSD-3-Clause AND 0BSD AND MIT AND Zlib AND CC0-1.0
Location: C:\Users\andi\.unsloth\studio\unsloth_studio\Lib\site-packages
Requires:
Required-by: accelerate, bitsandbytes, contourpy, data-designer-config, datasets, descript-audio-codec, descript-audiotools, diffusers, einx, evaluate, langid, librosa, matplotlib, numba, onnxruntime, openai-whisper, pandas, peft, pyloudnorm, pymupdf-layout, pystoi, scikit-learn, scipy, snac, soundfile, soxr, tensorboard, torch-stoi, torchvision, transformers, transformers-cfg, unsloth, unsloth_zoo, xformers```

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but i didnt tested with the newest version again (yet)

ripe prawn Mar 28, 2026, 2:29 PM

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ok can you try installing the new version first . let's see if that solves your problem

#Trying to train and unsloth studio :One of the subprocesses has abruptly died during map operation.