feat(rollout): integrate language runtime

docs/source/inference.mdx

@@ -1,6 +1,6 @@
 # Policy Deployment (lerobot-rollout)
 
-`lerobot-rollout` is the single CLI for deploying trained policies on real robots. It supports multiple execution strategies and inference backends, from quick evaluation to continuous recording and human-in-the-loop data collection.
+`lerobot-rollout` is the single CLI for deploying trained policies on real robots or in an interactive simulator. It supports multiple execution strategies and inference backends, from quick evaluation to continuous recording, language-driven control, and human-in-the-loop data collection.
 
 ## Quick Start
 
@@ -197,6 +197,53 @@ Teleop is optional — if omitted the robot holds its position during the reset
 
 ---
 
+## Interactive language control
+
+Language-conditioned policies can expose a high-level text head in addition to
+their action head. Add `--language` to open-prompt one of these policies on a
+real robot. Language-only flags such as `--direct_subtask` select this mode
+automatically.
+
+MolmoAct2 has no high-level planner, so use direct-subtask mode and type each
+next low-level instruction yourself:
+
+```bash
+lerobot-rollout \
+    --policy.path=lerobot/MolmoAct2-SO100_101-LeRobot \
+    --policy.device=cuda \
+    --robot.type=so101_follower \
+    --robot.port=/dev/ttyACM1 \
+    --robot.cameras='{"cam0":{"type":"opencv","index_or_path":"/dev/video0","width":640,"height":480,"fps":30,"fourcc":"MJPG","backend":200},"cam1":{"type":"opencv","index_or_path":"/dev/video2","width":640,"height":480,"fps":30,"fourcc":"MJPG","backend":200}}' \
+    --direct_subtask \
+    --robot.max_relative_target='{"shoulder_pan":5,"shoulder_lift":5,"elbow_flex":5,"wrist_flex":5,"wrist_roll":5,"gripper":5}'
+```
+
+The robot starts paused. Type a subtask, then use `/resume` and `/pause` to
+control action dispatch. Check the workspace and motion limits before resuming.
+Without `--direct_subtask`, a policy such as PI052 generates its active subtask
+from the high-level `--task` itself.
+
+RoboCasa uses the same runtime and processor path. `--sim` selects it
+automatically, so no robot configuration is needed:
+
+```bash
+MUJOCO_GL=egl lerobot-rollout \
+    --policy.path=lerobot/pi052_robocasa \
+    --sim --sim.task=CloseFridge --sim.split=pretrain \
+    --task="close the fridge" \
+    --disable_memory \
+    --sim.render_size=384 \
+    --sim.views=robot0_agentview_left,robot0_eye_in_hand,robot0_agentview_right \
+    --mode=action --ctrl_hz=20
+```
+
+Open `http://localhost:8010` for the live simulator view. Add
+`--sim.direct_subtask` to bypass the language planner and make each typed prompt
+the action policy's current subtask. The legacy `lerobot-language-runtime`
+command remains as a compatibility alias.
+
+---
+
 ## Inference Backends
 
 Select a backend with `--inference.type=<name>`. All strategies work with both backends.

pyproject.toml

@@ -358,7 +358,7 @@ lerobot-edit-dataset="lerobot.scripts.lerobot_edit_dataset:main"
 lerobot-setup-can="lerobot.scripts.lerobot_setup_can:main"
 lerobot-annotate="lerobot.scripts.lerobot_annotate:main"
 lerobot-rollout="lerobot.scripts.lerobot_rollout:main"
-# Interactive high/low-level runtime for language-conditioned policies (pi052, ...).
+# Backward-compatible alias; interactive language deployment is part of lerobot-rollout.
 lerobot-language-runtime="lerobot.scripts.lerobot_language_runtime:main"
 
 # ---------------- Tool Configurations ----------------

src/lerobot/policies/pi052/inference/__init__.py

@@ -16,7 +16,7 @@
 
 The runtime, REPL, and CLI are policy-agnostic and live in
 :mod:`lerobot.runtime`. PI052 supplies only :class:`PI052PolicyAdapter`;
-the ``lerobot-language-runtime`` entry point wires it into
+the ``lerobot-rollout --language`` entry point wires it into
 :func:`lerobot.runtime.cli.run`.
 """
 

src/lerobot/runtime/__init__.py

@@ -17,7 +17,7 @@
 The tick loop, REPL, and interactive CLI here are policy-independent. A
 policy plugs in by subclassing :class:`BaseLanguageAdapter` (or satisfying
 :class:`LanguageConditionedPolicyAdapter` directly) and registering it in
-:mod:`lerobot.runtime.registry`; ``lerobot-language-runtime`` then serves it.
+:mod:`lerobot.runtime.registry`; ``lerobot-rollout --language`` then serves it.
 """
 
 from .adapter import BaseLanguageAdapter, GenerationConfig, LanguageDiagnostics

src/lerobot/runtime/cli.py

@@ -29,7 +29,7 @@ Examples
 Dry run on a Hub checkpoint, no robot connected — useful for sanity-
 checking text generation::
 
-    uv run lerobot-language-runtime \\
+    uv run lerobot-rollout --language \\
         --policy.path=<repo-or-dir> \\
         --no_robot \\
         --task="please clean the kitchen"
@@ -37,7 +37,7 @@ checking text generation::
 Same, but feed real frames from an annotated dataset so plan / subtask
 / memory generation runs against actual video + state::
 
-    uv run lerobot-language-runtime \\
+    uv run lerobot-rollout --language \\
         --policy.path=<repo-or-dir> \\
         --dataset.repo_id=<annotated-dataset> \\
         --dataset.episode=0 \\
@@ -46,7 +46,7 @@ Same, but feed real frames from an annotated dataset so plan / subtask
 
 With a real robot::
 
-    uv run lerobot-language-runtime \\
+    uv run lerobot-rollout --language \\
         --policy.path=... \\
         --robot.type=so101 --robot.port=/dev/tty.usbmodem...
 
@@ -1561,7 +1561,7 @@ def run(
     ``adapter_factory`` turns ``(policy, GenerationConfig)`` into a
     :class:`LanguageConditionedPolicyAdapter` (typically the adapter class).
     When ``None`` it is resolved from :mod:`lerobot.runtime.registry` by the
-    loaded policy's type, so a single ``lerobot-language-runtime`` entry
+    loaded policy's type, so the ``lerobot-rollout`` entry
     point serves every registered policy. ``panel_label`` defaults to the
     policy type.
     """

src/lerobot/runtime/registry.py

@@ -14,7 +14,7 @@
 
 """Registry mapping a policy type to its language-runtime adapter.
 
-Kept as import strings (resolved lazily) so ``lerobot-language-runtime``
+Kept as import strings (resolved lazily) so ``lerobot-rollout --language``
 never imports a policy package until it actually loads that policy — the
 same pattern as :mod:`lerobot.policies.factory`.
 """

src/lerobot/scripts/lerobot_language_runtime.py

@@ -13,12 +13,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""Entry point for ``lerobot-language-runtime``.
+"""Compatibility entry point for ``lerobot-language-runtime``.
 
 Policy-agnostic: the runtime resolves the right adapter from the loaded
 policy's type via :mod:`lerobot.runtime.registry`. A new
 language-conditioned policy just registers its adapter there — no new
-script needed.
+script needed. New commands should use ``lerobot-rollout --language`` (or
+``lerobot-rollout --sim``); this alias remains so existing scripts do not
+break.
 """
 
 from __future__ import annotations

src/lerobot/scripts/lerobot_rollout.py

@@ -151,6 +151,7 @@ Usage examples
 """
 
 import logging
+import sys
 
 from lerobot.cameras.opencv import OpenCVCameraConfig  # noqa: F401
 from lerobot.cameras.realsense import RealSenseCameraConfig  # noqa: F401
@@ -241,10 +242,69 @@ def rollout(cfg: RolloutConfig):
     logger.info("Rollout finished")
 
 
-def main():
-    """CLI entry point for ``lerobot-rollout``."""
+_LANGUAGE_RUNTIME_FLAGS = {
+    "--language",
+    "--no_robot",
+    "--sim",
+    "--direct_subtask",
+    "--sim.direct_subtask",
+    "--disable_memory",
+    "--fp8",
+}
+_LANGUAGE_RUNTIME_PREFIXES = (
+    "--sim.",
+    "--chunk_hz",
+    "--ctrl_hz",
+    "--high_level_hz",
+    "--subtask_chunks_per_gen",
+    "--text_min_new_tokens",
+    "--text_temperature",
+    "--text_top_p",
+)
+
+
+def _uses_language_runtime(argv: list[str]) -> bool:
+    """Return whether *argv* selects the interactive language runtime.
+
+    ``--language`` is the explicit selector for real-robot runs whose other
+    options overlap with the standard rollout CLI. Language-only options also
+    select it automatically, which keeps the former language-runtime examples
+    working after replacing their command name with ``lerobot-rollout``.
+    """
+    return any(
+        arg.split("=", 1)[0] in _LANGUAGE_RUNTIME_FLAGS or arg.startswith(_LANGUAGE_RUNTIME_PREFIXES)
+        for arg in argv
+    )
+
+
+def main(argv: list[str] | None = None):
+    """CLI entry point for ``lerobot-rollout``.
+
+    Standard policy deployment continues through :class:`RolloutConfig`.
+    Interactive language-conditioned and RoboCasa runs share this entry point
+    and are selected with ``--language`` or any language-runtime-only option.
+    """
     register_third_party_plugins()
-    rollout()
+    cli_args = list(sys.argv[1:] if argv is None else argv)
+    if _uses_language_runtime(cli_args):
+        from lerobot.runtime.cli import run as run_language_runtime
+
+        # ``--language`` is a dispatcher flag, not part of the runtime's own
+        # argparse surface. All other arguments pass through unchanged.
+        runtime_args = [arg for arg in cli_args if arg != "--language"]
+        return run_language_runtime(runtime_args, prog="lerobot-rollout")
+
+    if argv is None:
+        return rollout()
+
+    # draccus reads sys.argv. Supporting an explicit argv keeps this entry
+    # point easy to smoke-test and mirrors the language-runtime branch above.
+    previous_argv = sys.argv
+    try:
+        sys.argv = [previous_argv[0], *cli_args]
+        return rollout()
+    finally:
+        sys.argv = previous_argv
 
 
 if __name__ == "__main__":

tests/policies/pi052/test_pi052_runtime_adapter.py

@@ -34,21 +34,38 @@ def test_pi052_adapter_strips_say_markers_from_plan_text():
     assert adapter.plan_from_text(text) == "Move to the sink."
 
 
-def test_language_runtime_cli_smoke_does_not_load_model(monkeypatch):
-    """The general entry resolves the pi052 adapter from the registry by policy type."""
+def test_rollout_language_cli_smoke_does_not_load_model(monkeypatch):
+    """lerobot-rollout dispatches language flags to the adapter-based runtime."""
     from lerobot.runtime import cli
-    from lerobot.scripts import lerobot_language_runtime
+    from lerobot.scripts import lerobot_rollout
 
     fake_policy = SimpleNamespace(config=SimpleNamespace(device="cpu", type="pi052"))
 
     monkeypatch.setattr(
         cli,
         "_load_policy_and_preprocessor",
-        lambda policy_path, dataset_repo_id: (fake_policy, None, None, None),
+        lambda policy_path, dataset_repo_id, **kwargs: (fake_policy, None, None, None),
     )
     monkeypatch.setattr(cli, "_run_repl", lambda runtime, **kwargs: 0)
 
-    assert (
-        lerobot_language_runtime.main(["--policy.path=fake", "--no_robot", "--task=clean", "--max_ticks=0"])
-        == 0
-    )
+    assert lerobot_rollout.main(["--policy.path=fake", "--no_robot", "--task=clean", "--max_ticks=0"]) == 0
+
+
+def test_rollout_language_dispatch_preserves_standard_molmoact2_path(monkeypatch):
+    """MolmoAct2 only opts into open prompting when a language flag is present."""
+    from lerobot.scripts import lerobot_rollout
+
+    standard = [
+        "--policy.path=lerobot/MolmoAct2-SO100_101-LeRobot",
+        "--robot.type=so101_follower",
+        "--task=pick up the cube",
+    ]
+    assert not lerobot_rollout._uses_language_runtime(standard)
+    assert lerobot_rollout._uses_language_runtime([*standard, "--direct_subtask"])
+    assert lerobot_rollout._uses_language_runtime(["--policy.path=lerobot/pi052_robocasa", "--sim"])
+
+    standard_calls = []
+    monkeypatch.setattr(lerobot_rollout, "register_third_party_plugins", lambda: None)
+    monkeypatch.setattr(lerobot_rollout, "rollout", lambda: standard_calls.append(True))
+    lerobot_rollout.main(standard)
+    assert standard_calls == [True]