unslothai/unsloth

[Bug] Tool_Calling does not work properly

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#3,092 opened on Aug 5, 2025

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help wanted

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Description

I followed this notebook: https://colab.research.google.com/github/unslothai/notebooks/blob/main/nb/Qwen2.5_Coder_(1.5B)-Tool_Calling.ipynb

Can I only use qwen for tool calling? When I use llama 3.2 1B, when executing the Function for Generation Constraint, I get NotImplementedError: Tokenizer not supported: PreTrainedTokenizerFast

When using phi-4-mini, I get ValueError: The following model_kwargs are not used by the model: ['num_logits_to_keep'] (note: types in the generate arguments will also be displayed in this list).

How can I make it run smoothly?

Contributor guide

Research direction
Investigate the error for Llama 3.2 1B: the tokenizer is not supported. Check unsloth's tokenizer mapping and add support for PreTrainedTokenizerFast. For phi 4 mini, the error is about unused model kwargs; ensure that generate() doesn't pass unsupported arguments. Compare with Qwen2.5 notebook to identify differences.
Tech stack
python
Domain
backendmachine learning
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
PythonBasic knowledge of LLMs
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50