The scripts/ tree contains active Orbit entrypoints.

• lib/: shared shell helpers used by launchers.
• conversion/: checkpoint conversion wrappers.

Training launchers themselves live under examples/high_precision/ and examples/low_precision/.

All launchers support environment overrides for data paths, checkpoints, Ray resources, W&B, eval, and smoke-test batch sizes.

scripts/lib/launcher.sh is the shared training launcher orchestrator. Focused helpers keep the mechanics separate:

• common.sh: shell utility predicates and process-env setup.
• tool_env.sh: CUDA modules, PATH/LD_LIBRARY_PATH, PYTHONPATH, no_proxy. Sourced by leaf training launchers and standalone tool/parity/conversion scripts.
• paths.sh: path validation, checkpoint resolution, and staging.
• wandb.sh: W&B key loading and W&B CLI args.
• preflight.sh: precision-specific parity preflights.
• megatron.sh, sglang.sh, peft.sh, rollout.sh, rl.sh, train.sh: per-domain defaults and argument arrays.
• ray.sh: Ray lifecycle, private port reservation, and the standalone Ray-job entrypoint.
• driver.sh: Python driver shim.

Low-precision parity checks are retained as Python CLIs under tools/: tools/check_fp8_checkpoint_parity.py, tools/check_int4_checkpoint_parity.py, tools/check_nvfp4_checkpoint_parity.py, tools/check_fp8_runtime_parity.py, tools/check_int4_runtime_parity.py, and tools/check_nvfp4_runtime_parity.py. scripts/lib/preflight.sh calls these tools directly for precision-specific preflight checks.