[BUG] `InitTrackerConfig` fields do not match the `InitTracker` constructor

[bsprenger]

Describe the bug

Thank you for maintaining this project!
The InitTrackerConfig has the fields in_keys and out_keys, which are not kwargs for InitTracker. The config is also missing the init_key field, so it looks like this is potentially a copy-paste leftover that perhaps has gone unchecked?

To Reproduce

from hydra.utils import instantiate

from torchrl.trainers.algorithms.configs.transforms import InitTrackerConfig

if __name__ == "__main__":
    cfg = InitTrackerConfig(init_key="is_test_init")
    assert cfg.init_key == "is_test_init"
    instantiate(cfg)

Traceback (most recent call last):
  File "my/path/reproduce.py", line 6, in <module>
    cfg = InitTrackerConfig(init_key="is_test_init")
TypeError: InitTrackerConfig.__init__() got an unexpected keyword argument 'init_key'

Expected behavior

No error should be raised for the above snippet.

Screenshots

System info

I'm working on a fork of the torchRL repo, installed in editable mode in a conda environment.

import torchrl, numpy, sys
print(torchrl.__version__, numpy.__version__, sys.version, sys.platform)

yields

0.0.0+unknown 2.2.6 3.10.18 | packaged by conda-forge | (main, Jun  4 2025, 14:46:00) [Clang 18.1.8 ] darwin

Reason and Possible fixes

I have opened a PR here: #3245

Checklist

• I have checked that there is no similar issue in the repo (required)
• I have read the documentation (required)
• I have provided a minimal working example to reproduce the bug (required)

[bsprenger]

Closing this issue as the PR has been merged 🚀