[Bug] TypeError: SFTConfig.__init__() got an unexpected keyword argument 'max_seq_length'

[jtourille]

What happened?

I am trying to use the BootstrapFinetune optimizer using a local Gemma 3 via SGLang, by following the tutorial on the DSPy website. Since I want to use Gemma 3, I need a recent version of transformers, so I do not pinpoint any version.

Looking at trl source code, it seems that the keyword max_seq_length in the SFTConfig class has been abandonned since the 0.16.0 version (last version is 0.22.2, which is the one installed in my case).

Is there any tutorial somewhere that has been recently tested ?

Steps to reproduce

My current environment was built as presented below.

$ uv venv --python=3.11
$ uv pip install dspy
$ uv pip install "sglang[all]"
$ uv pip install transformers accelerate trl peft

DSPy version

3.0.3

[steveepreston]

To Solve SFTConfig.__init__() got an unexpected keyword argument 'max_seq_length' error, update the arg name:

SFTConfig(
        ...
-       max_seq_length=1024,
+       max_length=1024,
)