with rtc

examples/openarms/evaluate_interpolation.py

@@ -15,11 +15,11 @@
 # limitations under the License.
 
 """
-OpenArms Policy Evaluation with Interpolation
+OpenArms Policy Evaluation with RTC and Interpolation
 
-Evaluates a trained policy with smooth action interpolation:
+Evaluates a trained policy with:
-- Decoupled camera capture (CAMERA_FPS) from robot control (ROBOT_FPS)
+- RTC (Real-Time Chunking) for async inference - decouples policy from robot loop
-- Speed multiplier to execute actions faster than training
+- Smooth action interpolation for high-frequency robot control
 - Velocity feedforward for smoother tracking
 - Adjustable PID gains
 
@@ -27,27 +27,41 @@ Example usage:
     python examples/openarms/evaluate_interpolation.py
 """
 
+import logging
+import math
+import sys
 import time
+import traceback
 from collections import deque
 from pathlib import Path
+from threading import Event, Lock, Thread
 
 import numpy as np
+import torch
+from torch import Tensor
 
 from lerobot.cameras.opencv.configuration_opencv import OpenCVCameraConfig
 from lerobot.configs.policies import PreTrainedConfig
+from lerobot.configs.types import RTCAttentionSchedule
 from lerobot.datasets.lerobot_dataset import LeRobotDataset
 from lerobot.datasets.pipeline_features import aggregate_pipeline_dataset_features, create_initial_features
-from lerobot.datasets.utils import combine_feature_dicts
+from lerobot.datasets.utils import build_dataset_frame, combine_feature_dicts, hw_to_dataset_features
-from lerobot.policies.factory import make_policy, make_pre_post_processors
+from lerobot.policies.factory import get_policy_class, make_pre_post_processors
+from lerobot.policies.rtc.action_queue import ActionQueue
+from lerobot.policies.rtc.configuration_rtc import RTCConfig
+from lerobot.policies.rtc.latency_tracker import LatencyTracker
 from lerobot.processor import make_default_processors
 from lerobot.robots.openarms.config_openarms_follower import OpenArmsFollowerConfig
 from lerobot.robots.openarms.openarms_follower import OpenArmsFollower
 from lerobot.teleoperators.openarms.config_openarms_leader import OpenArmsLeaderConfig
 from lerobot.teleoperators.openarms.openarms_leader import OpenArmsLeader
-from lerobot.utils.control_utils import init_keyboard_listener, predict_action
+from lerobot.utils.control_utils import init_keyboard_listener
-from lerobot.utils.utils import log_say, get_safe_torch_device
+from lerobot.utils.utils import log_say
 from lerobot.utils.visualization_utils import init_rerun
 
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
 
 # ======================== MODEL & TASK CONFIG ========================
 HF_MODEL_ID = "lerobot-data-collection/three-folds-pi0"  # TODO: Replace with your trained model
@@ -57,81 +71,107 @@ TASK_DESCRIPTION = "three-folds-dataset"  # TODO: Replace with your task
 # ======================== TIMING CONFIG ========================
 CAMERA_FPS = 30           # Camera hardware limit (fixed)
 POLICY_FPS = 30           # What the policy was trained with
-SPEED_MULTIPLIER = 1.2    # Execute actions faster (1.0 = normal, 1.2 = 20% faster)
 ROBOT_FPS = 50            # Robot command rate (higher = smoother interpolation)
 
-# Derived values
-EFFECTIVE_POLICY_FPS = int(POLICY_FPS * SPEED_MULTIPLIER)  # How fast we consume actions (36Hz at 1.2x)
-
 NUM_EPISODES = 1
 EPISODE_TIME_SEC = 300
 RESET_TIME_SEC = 60
 
+# ======================== RTC CONFIG ========================
+RTC_ENABLED = True
+RTC_EXECUTION_HORIZON = 20
+RTC_MAX_GUIDANCE_WEIGHT = 5.0
+ACTION_QUEUE_SIZE_TO_GET_NEW_ACTIONS = 30  # Should be > inference_delay + execution_horizon
+
 # ======================== PID TUNING ========================
-# Set to None to use robot config defaults
+CUSTOM_KP_SCALE = 1.0     # Scale factor for position gain (0.5-1.0, lower = smoother)
-CUSTOM_KP_SCALE = 0.7     # Scale factor for position gain (0.5-1.0, lower = smoother)
+CUSTOM_KD_SCALE = 1.0     # Scale factor for damping gain (1.0-2.0, higher = less overshoot)
-CUSTOM_KD_SCALE = 1.3     # Scale factor for damping gain (1.0-2.0, higher = less overshoot)
+USE_VELOCITY_FEEDFORWARD = False  # Enable velocity feedforward for smoother tracking
-USE_VELOCITY_FEEDFORWARD = True  # Enable velocity feedforward for smoother tracking
 
 # ======================== ROBOT CONFIG ========================
 FOLLOWER_LEFT_PORT = "can0"
 FOLLOWER_RIGHT_PORT = "can1"
 
-USE_LEADER_FOR_RESETS = True
+USE_LEADER_FOR_RESETS = False
 LEADER_LEFT_PORT = "can2"
 LEADER_RIGHT_PORT = "can3"
 
-# Camera config uses CAMERA_FPS (hardware limit)
+DEVICE = "cuda"
+
 CAMERA_CONFIG = {
-    "left_wrist": OpenCVCameraConfig(index_or_path="/dev/video5", width=640, height=480, fps=CAMERA_FPS),
+    "left_wrist": OpenCVCameraConfig(index_or_path="/dev/video5", width=1280, height=720, fps=CAMERA_FPS),
-    "right_wrist": OpenCVCameraConfig(index_or_path="/dev/video1", width=640, height=480, fps=CAMERA_FPS),
+    "right_wrist": OpenCVCameraConfig(index_or_path="/dev/video1", width=1280, height=720, fps=CAMERA_FPS),
     "base": OpenCVCameraConfig(index_or_path="/dev/video3", width=640, height=480, fps=CAMERA_FPS),
 }
 
 
+class RobotWrapper:
+    """Thread-safe wrapper for robot operations."""
+
+    def __init__(self, robot: OpenArmsFollower):
+        self.robot = robot
+        self.lock = Lock()
+
+    def get_observation(self) -> dict[str, Tensor]:
+        with self.lock:
+            return self.robot.get_observation()
+
+    def send_action(self, action: dict, **kwargs) -> None:
+        with self.lock:
+            self.robot.send_action(action, **kwargs)
+
+    @property
+    def observation_features(self) -> dict:
+        with self.lock:
+            return self.robot.observation_features
+
+    @property
+    def action_features(self) -> dict:
+        with self.lock:
+            return self.robot.action_features
+
+    @property
+    def name(self) -> str:
+        return self.robot.name
+
+
 class ActionInterpolator:
-    """Interpolate between policy actions for smoother robot control with velocity estimation."""
+    """Interpolate between consecutive actions for smoother robot control."""
     
-    def __init__(self, effective_policy_fps: int, robot_fps: int):
+    def __init__(self, policy_fps: int, robot_fps: int):
-        self.effective_policy_fps = effective_policy_fps
+        self.policy_fps = policy_fps
         self.robot_fps = robot_fps
-        self.substeps_per_policy_step = robot_fps / effective_policy_fps
+        self.substeps_per_policy_step = robot_fps / policy_fps
-        self.prev_action: dict | None = None
+        self.prev_action: Tensor | None = None
-        self.curr_action: dict | None = None
+        self.curr_action: Tensor | None = None
         self.substep = 0
-        self.last_interpolated: dict | None = None
+        self.last_interpolated: Tensor | None = None
         
-    def update(self, new_action: dict) -> None:
+    def update(self, new_action: Tensor) -> None:
         self.prev_action = self.curr_action
         self.curr_action = new_action
         self.substep = 0
         
-    def get_interpolated_action(self) -> tuple[dict | None, dict | None]:
+    def get_interpolated_action(self) -> tuple[Tensor | None, Tensor | None]:
-        """Returns (interpolated_position, estimated_velocity_deg_per_sec)"""
+        """Returns (interpolated_action, estimated_velocity)"""
         if self.curr_action is None:
             return None, None
         if self.prev_action is None:
-            self.last_interpolated = self.curr_action.copy()
+            self.last_interpolated = self.curr_action.clone()
-            return self.curr_action, {k: 0.0 for k in self.curr_action}
+            return self.curr_action, torch.zeros_like(self.curr_action)
             
         t = min(self.substep / self.substeps_per_policy_step, 1.0)
         self.substep += 1
         
-        interpolated = {}
+        interpolated = self.prev_action * (1 - t) + self.curr_action * t
-        velocity = {}
+        
         dt = 1.0 / self.robot_fps
+        if self.last_interpolated is not None:
+            velocity = (interpolated - self.last_interpolated) / dt
+        else:
+            velocity = (self.curr_action - self.prev_action) * self.policy_fps
         
-        for key in self.curr_action:
+        self.last_interpolated = interpolated.clone()
-            prev = self.prev_action.get(key, self.curr_action[key])
-            curr = self.curr_action[key]
-            interpolated[key] = prev * (1 - t) + curr * t
-            
-            if self.last_interpolated is not None and key in self.last_interpolated:
-                velocity[key] = (interpolated[key] - self.last_interpolated[key]) / dt
-            else:
-                velocity[key] = (curr - prev) * self.effective_policy_fps
-        
-        self.last_interpolated = interpolated.copy()
         return interpolated, velocity
     
     def reset(self):
@@ -175,160 +215,230 @@ class HzTracker:
         self.last_print_time = 0
 
 
-def interpolated_eval_loop(
+def get_actions_thread(
-    robot,
     policy,
-    preprocessor,
+    robot: RobotWrapper,
-    postprocessor,
     robot_observation_processor,
+    action_queue: ActionQueue,
+    shutdown_event: Event,
+    episode_active: Event,
+    rtc_config: RTCConfig,
+    policy_fps: int,
+    task: str,
+    pretrained_path: str,
+    device: str,
+):
+    """Thread function to asynchronously generate action chunks from the policy."""
+    try:
+        logger.info("[GET_ACTIONS] Starting action generation thread")
+
+        latency_tracker = LatencyTracker()
+        time_per_chunk = 1.0 / policy_fps
+
+        hw_features = hw_to_dataset_features(robot.observation_features, "observation")
+        policy_device = device
+
+        logger.info(f"[GET_ACTIONS] Loading preprocessor/postprocessor from {pretrained_path}")
+
+        preprocessor, postprocessor = make_pre_post_processors(
+            policy_cfg=policy.config,
+            pretrained_path=pretrained_path,
+            dataset_stats=None,
+            preprocessor_overrides={"device_processor": {"device": device}},
+        )
+
+        logger.info("[GET_ACTIONS] Preprocessor/postprocessor loaded successfully")
+
+        get_actions_threshold = ACTION_QUEUE_SIZE_TO_GET_NEW_ACTIONS if rtc_config.enabled else 0
+
+        while not shutdown_event.is_set():
+            if not episode_active.is_set():
+                time.sleep(0.01)
+                continue
+
+            if action_queue.qsize() <= get_actions_threshold:
+                current_time = time.perf_counter()
+                action_index_before_inference = action_queue.get_action_index()
+                prev_actions = action_queue.get_left_over()
+
+                inference_latency = latency_tracker.max()
+                inference_delay = math.ceil(inference_latency / time_per_chunk) if inference_latency else 0
+
+                obs = robot.get_observation()
+                obs_processed = robot_observation_processor(obs)
+
+                obs_with_policy_features = build_dataset_frame(
+                    hw_features, obs_processed, prefix="observation"
+                )
+
+                for name in obs_with_policy_features:
+                    obs_with_policy_features[name] = torch.from_numpy(obs_with_policy_features[name])
+                    if "image" in name:
+                        obs_with_policy_features[name] = (
+                            obs_with_policy_features[name].type(torch.float32) / 255
+                        )
+                        obs_with_policy_features[name] = (
+                            obs_with_policy_features[name].permute(2, 0, 1).contiguous()
+                        )
+                    obs_with_policy_features[name] = obs_with_policy_features[name].unsqueeze(0)
+                    obs_with_policy_features[name] = obs_with_policy_features[name].to(policy_device)
+
+                obs_with_policy_features["task"] = [task]
+                obs_with_policy_features["robot_type"] = robot.name
+
+                preprocessed_obs = preprocessor(obs_with_policy_features)
+
+                actions = policy.predict_action_chunk(
+                    preprocessed_obs,
+                    inference_delay=inference_delay,
+                    prev_chunk_left_over=prev_actions,
+                )
+
+                original_actions = actions.squeeze(0).clone()
+                postprocessed_actions = postprocessor(actions).squeeze(0)
+
+                new_latency = time.perf_counter() - current_time
+                new_delay = math.ceil(new_latency / time_per_chunk)
+                latency_tracker.add(new_latency)
+
+                if ACTION_QUEUE_SIZE_TO_GET_NEW_ACTIONS < rtc_config.execution_horizon + new_delay:
+                    logger.warning(
+                        "[GET_ACTIONS] action_queue_size_to_get_new_actions too small. "
+                        "Should be higher than inference delay + execution horizon."
+                    )
+
+                action_queue.merge(
+                    original_actions, postprocessed_actions, new_delay, action_index_before_inference
+                )
+
+                logger.debug(
+                    f"[GET_ACTIONS] Generated chunk, latency={new_latency:.3f}s, "
+                    f"delay={new_delay}, queue_size={action_queue.qsize()}"
+                )
+            else:
+                time.sleep(0.01)
+
+        logger.info("[GET_ACTIONS] Action generation thread shutting down")
+    except Exception as e:
+        logger.error(f"[GET_ACTIONS] Fatal exception: {e}")
+        logger.error(traceback.format_exc())
+        shutdown_event.set()
+        sys.exit(1)
+
+
+def actor_thread(
+    robot: RobotWrapper,
     robot_action_processor,
-    dataset,
+    action_queue: ActionQueue,
-    events,
+    shutdown_event: Event,
+    episode_active: Event,
     interpolator: ActionInterpolator,
     robot_hz_tracker: HzTracker,
-    camera_fps: int,
-    effective_policy_fps: int,
     robot_fps: int,
-    control_time_s: float,
+    action_keys: list[str],
-    task: str,
+    custom_kp: dict | None,
-    kp_scale: float | None = None,
+    custom_kd: dict | None,
-    kd_scale: float | None = None,
+    use_velocity_ff: bool,
-    use_velocity_ff: bool = False,
 ):
-    """
+    """Thread function to execute interpolated actions on the robot at high frequency."""
-    Run evaluation with decoupled camera and robot control:
+    try:
-    - Camera captures at camera_fps (hardware limit)
+        logger.info("[ACTOR] Starting actor thread")
-    - Policy inference runs when new camera frame is available
+
-    - Actions are consumed at effective_policy_fps (sped up by SPEED_MULTIPLIER)
+        action_count = 0
-    - Robot receives interpolated commands at robot_fps (smoothest)
+        action_interval = 1.0 / robot_fps
-    """
+
-    from lerobot.scripts.lerobot_record import build_dataset_frame, make_robot_action
+        while not shutdown_event.is_set():
-    from lerobot.utils.visualization_utils import log_rerun_data
+            if not episode_active.is_set():
-    
+                time.sleep(0.01)
-    camera_dt = 1.0 / camera_fps
+                continue
-    policy_dt = 1.0 / effective_policy_fps
+
-    robot_dt = 1.0 / robot_fps
+            start_time = time.perf_counter()
-    
-    interpolator.reset()
-    robot_hz_tracker.reset()
-    policy.reset()
-    
-    # Build custom gains if scaling is enabled
-    custom_kp = None
-    custom_kd = None
-    if kp_scale is not None or kd_scale is not None:
-        custom_kp = {}
-        custom_kd = {}
-        for arm in ["right", "left"]:
-            bus = robot.bus_right if arm == "right" else robot.bus_left
-            for i, motor_name in enumerate(bus.motors):
-                full_name = f"{arm}_{motor_name}"
-                default_kp = robot.config.position_kp[i] if isinstance(robot.config.position_kp, list) else robot.config.position_kp
-                default_kd = robot.config.position_kd[i] if isinstance(robot.config.position_kd, list) else robot.config.position_kd
-                custom_kp[full_name] = default_kp * (kp_scale or 1.0)
-                custom_kd[full_name] = default_kd * (kd_scale or 1.0)
-        print(f"Custom gains: kp_scale={kp_scale}, kd_scale={kd_scale}")
-    
-    if use_velocity_ff:
-        print("Velocity feedforward: enabled")
-    
-    last_camera_time = -camera_dt
-    last_policy_action_time = -policy_dt
-    cached_observation = None
-    cached_robot_action = None
-    
-    start_time = time.perf_counter()
-    
-    print(f"\nStarting interpolated eval loop:")
-    print(f"  Camera: {camera_fps}Hz | Policy actions consumed: {effective_policy_fps}Hz | Robot: {robot_fps}Hz")
-    
-    while time.perf_counter() - start_time < control_time_s:
-        if events["exit_early"] or events["stop_recording"]:
-            break
             
-        loop_start = time.perf_counter()
+            # Get new action from queue and update interpolator
-        elapsed = loop_start - start_time
+            action = action_queue.get()
-        
+            if action is not None:
-        # === CAMERA CAPTURE (at camera_fps, decoupled from robot) ===
+                interpolator.update(action.cpu())
-        if elapsed - last_camera_time >= camera_dt:
-            obs = robot.get_observation()
-            obs_processed = robot_observation_processor(obs)
-            observation_frame = build_dataset_frame(dataset.features, obs_processed, prefix="observation")
             
-            # Run policy inference with fresh observation
+            # Get interpolated action for smooth control
-            action_values = predict_action(
+            smooth_action, velocity = interpolator.get_interpolated_action()
-                observation=observation_frame,
-                policy=policy,
-                device=get_safe_torch_device(policy.config.device),
-                preprocessor=preprocessor,
-                postprocessor=postprocessor,
-                use_amp=policy.config.use_amp,
-                task=task,
-                robot_type=robot.robot_type,
-            )
             
-            act_processed = make_robot_action(action_values, dataset.features)
+            if smooth_action is not None:
-            cached_robot_action = robot_action_processor((act_processed, obs))
+                action_dict = {}
-            cached_observation = (obs_processed, observation_frame, act_processed)
+                for i, key in enumerate(action_keys):
-            
+                    if i < len(smooth_action):
-            last_camera_time = elapsed
+                        action_dict[key] = smooth_action[i].item()
-        
+
-        # === ACTION UPDATE (at effective_policy_fps, faster than camera if speed > 1) ===
+                action_processed = robot_action_processor((action_dict, None))
-        if elapsed - last_policy_action_time >= policy_dt and cached_robot_action is not None:
+                
-            interpolator.update(cached_robot_action)
+                vel_ff = None
-            last_policy_action_time = elapsed
+                if use_velocity_ff and velocity is not None:
-            
+                    vel_ff = {}
-            # Save to dataset at effective policy rate
+                    for i, key in enumerate(action_keys):
-            if dataset is not None and cached_observation is not None:
+                        if i < len(velocity):
-                obs_processed, observation_frame, act_processed = cached_observation
+                            motor_name = key.replace(".pos", "")
-                action_frame = build_dataset_frame(dataset.features, act_processed, prefix="action")
+                            vel_ff[motor_name] = velocity[i].item()
-                frame = {**observation_frame, **action_frame, "task": task}
+                
-                dataset.add_frame(frame)
+                robot.send_action(action_processed, custom_kp=custom_kp, custom_kd=custom_kd, velocity_feedforward=vel_ff)
-                log_rerun_data(observation=obs_processed, action=act_processed)
+                action_count += 1
-        
+
-        # === ROBOT COMMAND (at robot_fps, highest rate for smoothness) ===
+            robot_hz_tracker.tick()
-        smooth_action, velocity = interpolator.get_interpolated_action()
+
-        if smooth_action is not None:
+            dt_s = time.perf_counter() - start_time
-            vel_ff = velocity if use_velocity_ff else None
+            sleep_time = max(0, action_interval - dt_s - 0.001)
-            robot.send_action(smooth_action, custom_kp=custom_kp, custom_kd=custom_kd, velocity_feedforward=vel_ff)
+            if sleep_time > 0:
-        
+                time.sleep(sleep_time)
-        robot_hz_tracker.tick()
+
-        
+        logger.info(f"[ACTOR] Actor thread shutting down. Total actions executed: {action_count}")
-        # Maintain robot control rate
+    except Exception as e:
-        sleep_time = robot_dt - (time.perf_counter() - loop_start)
+        logger.error(f"[ACTOR] Fatal exception: {e}")
-        if sleep_time > 0:
+        logger.error(traceback.format_exc())
-            time.sleep(sleep_time)
+        shutdown_event.set()
+        sys.exit(1)
+
+
+def build_custom_gains(robot, kp_scale: float | None, kd_scale: float | None) -> tuple[dict | None, dict | None]:
+    """Build custom KP/KD gains for the robot."""
+    if kp_scale is None and kd_scale is None:
+        return None, None
     
-    # Print final stats
+    custom_kp = {}
-    robot_hz = robot_hz_tracker.get_avg_hz()
+    custom_kd = {}
-    if robot_hz:
+    for arm in ["right", "left"]:
-        print(f"\nFinal average robot Hz: {robot_hz:.1f}")
+        bus = robot.robot.bus_right if arm == "right" else robot.robot.bus_left
+        for i, motor_name in enumerate(bus.motors):
+            full_name = f"{arm}_{motor_name}"
+            default_kp = robot.robot.config.position_kp[i] if isinstance(robot.robot.config.position_kp, list) else robot.robot.config.position_kp
+            default_kd = robot.robot.config.position_kd[i] if isinstance(robot.robot.config.position_kd, list) else robot.robot.config.position_kd
+            custom_kp[full_name] = default_kp * (kp_scale or 1.0)
+            custom_kd[full_name] = default_kd * (kd_scale or 1.0)
+    
+    return custom_kp, custom_kd
 
 
 def main():
-    """Main evaluation function."""
+    """Main evaluation function with RTC and interpolation."""
     print("=" * 60)
-    print("OpenArms Policy Evaluation with Interpolation")
+    print("OpenArms Policy Evaluation with RTC + Interpolation")
     print("=" * 60)
     print(f"\nModel: {HF_MODEL_ID}")
     print(f"Dataset: {HF_EVAL_DATASET_ID}")
     print(f"Task: {TASK_DESCRIPTION}")
     print(f"\n--- Timing ---")
-    print(f"Camera FPS: {CAMERA_FPS} (hardware limit)")
+    print(f"Policy FPS: {POLICY_FPS}Hz")
-    print(f"Policy trained at: {POLICY_FPS}Hz")
+    print(f"Robot FPS: {ROBOT_FPS}Hz (interpolated)")
-    print(f"Speed multiplier: {SPEED_MULTIPLIER}x")
+    print(f"\n--- RTC ---")
-    print(f"Effective policy FPS: {EFFECTIVE_POLICY_FPS}Hz (actions consumed)")
+    print(f"RTC Enabled: {RTC_ENABLED}")
-    print(f"Robot FPS: {ROBOT_FPS}Hz (interpolated commands)")
+    print(f"Execution Horizon: {RTC_EXECUTION_HORIZON}")
-    print(f"\n--- PID Tuning ---")
+    print(f"Max Guidance Weight: {RTC_MAX_GUIDANCE_WEIGHT}")
-    print(f"KP scale: {CUSTOM_KP_SCALE}")
+    print(f"\n--- PID ---")
-    print(f"KD scale: {CUSTOM_KD_SCALE}")
+    print(f"KP scale: {CUSTOM_KP_SCALE}, KD scale: {CUSTOM_KD_SCALE}")
-    print(f"Velocity feedforward: {USE_VELOCITY_FEEDFORWARD}")
+    print(f"Velocity FF: {USE_VELOCITY_FEEDFORWARD}")
     print(f"\n--- Episodes ---")
-    print(f"Episodes: {NUM_EPISODES}")
+    print(f"Episodes: {NUM_EPISODES}, Duration: {EPISODE_TIME_SEC}s")
-    print(f"Duration: {EPISODE_TIME_SEC}s per episode")
-    print(f"Reset time: {RESET_TIME_SEC}s")
-    print(f"Leader for resets: {USE_LEADER_FOR_RESETS}")
     print("=" * 60)
+
+    shutdown_event = Event()
+    episode_active = Event()
     
     follower_config = OpenArmsFollowerConfig(
         port_left=FOLLOWER_LEFT_PORT,
@@ -346,6 +456,9 @@ def main():
     if not follower.is_connected:
         raise RuntimeError("Follower robot failed to connect!")
 
+    robot = RobotWrapper(follower)
+    logger.info("Follower robot connected")
+
     leader = None
     if USE_LEADER_FOR_RESETS:
         leader_config = OpenArmsLeaderConfig(
@@ -366,9 +479,9 @@ def main():
             leader.bus_right.enable_torque()
             leader.bus_left.enable_torque()
             time.sleep(0.1)
-            print(f"Leader connected with gravity compensation")
+            print("Leader connected with gravity compensation")
         else:
-            print(f"Leader connected (no gravity compensation)")
+            print("Leader connected (no gravity compensation)")
 
     teleop_action_processor, robot_action_processor, robot_observation_processor = make_default_processors()
     
@@ -401,10 +514,9 @@ def main():
                 leader.disconnect()
             return
     
-    # Dataset uses effective policy FPS (sped up rate)
     dataset = LeRobotDataset.create(
         repo_id=HF_EVAL_DATASET_ID,
-        fps=EFFECTIVE_POLICY_FPS,
+        fps=POLICY_FPS,
         features=dataset_features,
         robot_type=follower.name,
         use_videos=True,
@@ -412,53 +524,102 @@ def main():
         image_writer_threads=12, 
     )
     
+    # Load policy with RTC support
+    logger.info(f"Loading policy from: {HF_MODEL_ID}")
     policy_config = PreTrainedConfig.from_pretrained(HF_MODEL_ID)
     policy_config.pretrained_path = HF_MODEL_ID
-    policy = make_policy(policy_config, ds_meta=dataset.meta)
     
-    preprocessor, postprocessor = make_pre_post_processors(
+    policy_class = get_policy_class(policy_config.type)
-        policy_cfg=policy.config,
+    policy = policy_class.from_pretrained(HF_MODEL_ID, config=policy_config)
-        pretrained_path=HF_MODEL_ID,
+    
-        dataset_stats=dataset.meta.stats,
+    rtc_config = RTCConfig(
-        preprocessor_overrides={
+        enabled=RTC_ENABLED,
-            "device_processor": {"device": str(policy.config.device)}
+        execution_horizon=RTC_EXECUTION_HORIZON,
-        },
+        max_guidance_weight=RTC_MAX_GUIDANCE_WEIGHT,
+        prefix_attention_schedule=RTCAttentionSchedule.EXP,
     )
+    policy.config.rtc_config = rtc_config
+    policy.init_rtc_processor()
+    
+    assert policy.name in ["smolvla", "pi05", "pi0"], "Only smolvla, pi05, and pi0 support RTC"
+    
+    policy = policy.to(DEVICE)
+    policy.eval()
+    
+    logger.info(f"Policy loaded: {policy.name}")
 
     print(f"\nRunning evaluation...")
     listener, events = init_keyboard_listener()
-    init_rerun(session_name="openarms_evaluation_interp")
+    init_rerun(session_name="openarms_eval_rtc_interp")
     
-    interpolator = ActionInterpolator(effective_policy_fps=EFFECTIVE_POLICY_FPS, robot_fps=ROBOT_FPS)
+    action_keys = [k for k in robot.action_features.keys() if k.endswith(".pos")]
-    robot_hz_tracker = HzTracker(name="Robot", window_size=100, print_interval=2.0)
+    custom_kp, custom_kd = build_custom_gains(robot, CUSTOM_KP_SCALE, CUSTOM_KD_SCALE)
     
+    if custom_kp:
+        print(f"Custom gains applied")
+    if USE_VELOCITY_FEEDFORWARD:
+        print("Velocity feedforward: enabled")
+
     episode_idx = 0
+    get_actions_t = None
+    actor_t = None
     
     try:
         while episode_idx < NUM_EPISODES and not events["stop_recording"]:
             log_say(f"Evaluating episode {episode_idx + 1} of {NUM_EPISODES}")
             print(f"\n--- Episode {episode_idx + 1}/{NUM_EPISODES} ---")
             
-            interpolated_eval_loop(
+            action_queue = ActionQueue(rtc_config)
-                robot=follower,
+            interpolator = ActionInterpolator(policy_fps=POLICY_FPS, robot_fps=ROBOT_FPS)
-                policy=policy,
+            robot_hz_tracker = HzTracker(name="Robot", window_size=100, print_interval=2.0)
-                preprocessor=preprocessor,
+            
-                postprocessor=postprocessor,
+            get_actions_t = Thread(
-                robot_observation_processor=robot_observation_processor,
+                target=get_actions_thread,
-                robot_action_processor=robot_action_processor,
+                args=(
-                dataset=dataset,
+                    policy, robot, robot_observation_processor, action_queue,
-                events=events,
+                    shutdown_event, episode_active, rtc_config, POLICY_FPS,
-                interpolator=interpolator,
+                    TASK_DESCRIPTION, HF_MODEL_ID, DEVICE,
-                robot_hz_tracker=robot_hz_tracker,
+                ),
-                camera_fps=CAMERA_FPS,
+                daemon=True,
-                effective_policy_fps=EFFECTIVE_POLICY_FPS,
+                name="GetActions",
-                robot_fps=ROBOT_FPS,
-                control_time_s=EPISODE_TIME_SEC,
-                task=TASK_DESCRIPTION,
-                kp_scale=CUSTOM_KP_SCALE,
-                kd_scale=CUSTOM_KD_SCALE,
-                use_velocity_ff=USE_VELOCITY_FEEDFORWARD,
             )
+            get_actions_t.start()
+            
+            actor_t = Thread(
+                target=actor_thread,
+                args=(
+                    robot, robot_action_processor, action_queue,
+                    shutdown_event, episode_active, interpolator, robot_hz_tracker,
+                    ROBOT_FPS, action_keys, custom_kp, custom_kd, USE_VELOCITY_FEEDFORWARD,
+                ),
+                daemon=True,
+                name="Actor",
+            )
+            actor_t.start()
+            
+            logger.info("Started inference and actor threads")
+            
+            episode_active.set()
+            episode_start_time = time.time()
+            
+            while (time.time() - episode_start_time) < EPISODE_TIME_SEC:
+                if events["exit_early"] or events["stop_recording"] or shutdown_event.is_set():
+                    break
+                
+                elapsed = time.time() - episode_start_time
+                if int(elapsed) % 10 == 0 and int(elapsed) > 0:
+                    robot_hz = robot_hz_tracker.get_avg_hz()
+                    logger.info(
+                        f"Progress: {elapsed:.0f}/{EPISODE_TIME_SEC}s, "
+                        f"queue={action_queue.qsize()}, hz={robot_hz:.1f if robot_hz else 0}"
+                    )
+                
+                time.sleep(0.5)
+            
+            episode_active.clear()
+            
+            robot_hz = robot_hz_tracker.get_avg_hz()
+            logger.info(f"Episode {episode_idx + 1} done. Avg Hz: {robot_hz:.1f if robot_hz else 0}")
             
             if events["rerecord_episode"]:
                 log_say("Re-recording episode")
@@ -566,6 +727,15 @@ def main():
         print("\n\nInterrupted by user")
     
     finally:
+        shutdown_event.set()
+        episode_active.clear()
+        
+        if get_actions_t is not None and get_actions_t.is_alive():
+            get_actions_t.join(timeout=2.0)
+        
+        if actor_t is not None and actor_t.is_alive():
+            actor_t.join(timeout=2.0)
+        
         if leader:
             leader.bus_right.disable_torque()
             leader.bus_left.disable_torque()
@@ -573,6 +743,7 @@ def main():
             leader.disconnect()
 
         follower.disconnect()
+        logger.info("Follower disconnected")
         
         if listener is not None:
             listener.stop()