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Author SHA1 Message Date
Maxime Ellerbach 410b8f946d docs: fix table formatting via prettier 2026-07-27 09:40:16 +00:00
griffinaddison 360e619e18 feat(rollout): add smooth_handover flag to episodic strategy config
Follow-up to #3985, which added the same flag to the DAgger strategy.

The episodic strategy's reset-phase handover had two gaps:
- Non-actuated teleops could not skip the blocking follower slide at all.
- Setting smooth_leader_to_follower_handover=false on an actuated teleop
  swapped which arm moves instead of skipping the handover.

Add --strategy.smooth_handover (default true, existing behavior
unchanged) as a master switch that skips the interpolation entirely,
for clutch-style teleops that re-reference at the current robot pose
on engage.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-27 09:38:16 +00:00
3 changed files with 37 additions and 23 deletions
+9 -8
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@@ -186,14 +186,15 @@ Teleop is optional — if omitted the robot holds its position during the reset
| `←` (left) | Discard episode and re-record it |
| `ESC` | Stop the recording session |
| Flag | Description |
| ----------------------------------------------- | -------------------------------------------------------------------------- |
| `--dataset.num_episodes` | Number of episodes to record |
| `--dataset.episode_time_s` | Duration of each recording episode in seconds |
| `--dataset.reset_time_s` | Duration of the reset phase between episodes in seconds |
| `--teleop.type` | Optional. Teleoperator to drive the robot during resets |
| `--strategy.reset_to_initial_position` | Whether to reset the robot to its initial position between episodes |
| `--strategy.smooth_leader_to_follower_handover` | Whether to turn on or off the leader -> follower smooth handover behavior. |
| Flag | Description |
| ----------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `--dataset.num_episodes` | Number of episodes to record |
| `--dataset.episode_time_s` | Duration of each recording episode in seconds |
| `--dataset.reset_time_s` | Duration of the reset phase between episodes in seconds |
| `--teleop.type` | Optional. Teleoperator to drive the robot during resets |
| `--strategy.reset_to_initial_position` | Whether to reset the robot to its initial position between episodes |
| `--strategy.smooth_leader_to_follower_handover` | Whether to turn on or off the leader -> follower smooth handover behavior. |
| `--strategy.smooth_handover` | Smoothly hand control to the teleop at reset start (default: true). Disable for clutch-style teleops that re-reference at the current robot pose on engage |
---
+9
View File
@@ -149,6 +149,15 @@ class EpisodicStrategyConfig(RolloutStrategyConfig):
# Note that leader -> follower handover is only supported when the leader has `send_feedback` capability.
smooth_leader_to_follower_handover: bool = True
# Whether to turn on or off the smooth handover behavior at the start of the
# reset phase: the leader is driven to the follower position (actuated
# teleops, see `smooth_leader_to_follower_handover`), or the follower is
# slid to the teleop pose (non-actuated teleops). Disable for clutch-style
# teleoperators (e.g. VR controllers) that re-reference at the current robot
# pose on engage: the handover is already continuous there, and the blocking
# interpolation only delays the start of the reset phase.
smooth_handover: bool = True
@RolloutStrategyConfig.register_subclass("dagger")
@dataclass
+19 -15
View File
@@ -143,21 +143,25 @@ class EpisodicStrategy(RolloutStrategy):
# position so the operator takes over without fighting the arm.
# For non-actuated teleops: slide the follower to the teleop's current
# pose instead, since the leader cannot be driven.
obs = robot.get_observation()
current_pos = {k: v for k, v in obs.items() if k.endswith(".pos")}
if (
teleop_supports_feedback(teleop)
and self.config.smooth_leader_to_follower_handover
):
logger.info("Smooth handover: moving leader arm to follower position")
teleop_smooth_move_to(teleop, current_pos, duration_s=2)
teleop.disable_torque()
else:
logger.info("Smooth handover: sliding follower to teleop position")
teleop_action = teleop.get_action()
processed = ctx.processors.teleop_action_processor((teleop_action, obs))
target = ctx.processors.robot_action_processor((processed, obs))
follower_smooth_move_to(robot, current_pos, target, duration_s=1)
# Disabled entirely with --strategy.smooth_handover=false (useful for
# clutch-style teleops that re-reference at the current robot pose on
# engage).
if self.config.smooth_handover:
obs = robot.get_observation()
current_pos = {k: v for k, v in obs.items() if k.endswith(".pos")}
if (
teleop_supports_feedback(teleop)
and self.config.smooth_leader_to_follower_handover
):
logger.info("Smooth handover: moving leader arm to follower position")
teleop_smooth_move_to(teleop, current_pos, duration_s=2)
teleop.disable_torque()
else:
logger.info("Smooth handover: sliding follower to teleop position")
teleop_action = teleop.get_action()
processed = ctx.processors.teleop_action_processor((teleop_action, obs))
target = ctx.processors.robot_action_processor((processed, obs))
follower_smooth_move_to(robot, current_pos, target, duration_s=1)
elif self.config.reset_to_initial_position:
# No teleop: return the robot to its startup position.