The `from lerobot.jobs import submit_to_hf` was a function-local import in
train(); it pulls no heavy/optional deps and has no circular-import risk, so
move it to the top-level import block.
The module imports lerobot.scripts.lerobot_train, which eagerly pulls in
lerobot.datasets (dataset extra). The base fast-test CI tier runs without
that extra, so collection failed there. Guard with pytest.importorskip,
matching the existing tests/scripts dataset-extra tests.
When --job.target names a GPU flavor, train() dispatches to lerobot.jobs.submit_to_hf
instead of training locally: it authenticates, ensures the dataset is on the Hub
(pushing a local-only one privately), serializes a pod-compatible train_config.json
(strips client-only fields, points at the model repo), submits via HfApi.run_job
with HF_TOKEN/WANDB_API_KEY secrets, then streams logs and finishes when the model
is pushed. Wires push_checkpoint_to_hub into the training loop behind
save_checkpoint_to_hub, and tags jobs/datasets/model with 'lerobot' + --job.tags.
Nicolas Rabault