auto detect mode and stats

examples/openarms/evaluate_ee.py

@@ -35,12 +35,13 @@ import numpy as np
 import torch
 
 from lerobot.cameras.opencv.configuration_opencv import OpenCVCameraConfig
+from lerobot.configs.policies import PreTrainedConfig
+from lerobot.configs.train import TrainPipelineConfig
 from lerobot.utils.relative_actions import (
     convert_state_to_relative,
     convert_from_relative_actions,
     PerTimestepNormalizer,
 )
-from lerobot.configs.policies import PreTrainedConfig
 from lerobot.model.kinematics import RobotKinematics
 from lerobot.policies.factory import make_policy, make_pre_post_processors
 from lerobot.processor import RobotAction, RobotObservation, RobotProcessorPipeline
@@ -71,11 +72,6 @@ FPS = 30
 EPISODE_TIME_SEC = 1000
 RESET_TIME_SEC = 60
 
-# UMI-style relative action/state (must match training config)
-USE_RELATIVE_ACTIONS = False  # If True, policy outputs relative EE actions
-USE_RELATIVE_STATE = False    # If True, convert state to relative before policy input
-RELATIVE_STATS_PATH = None    # Path to relative_stats.pt (for per-timestep normalization)
-
 # Robot CAN interfaces
 FOLLOWER_LEFT_PORT = "can0"
 FOLLOWER_RIGHT_PORT = "can1"
@@ -102,6 +98,51 @@ LEFT_URDF_JOINTS = [f"openarm_left_joint{i}" for i in range(1, 8)]
 RIGHT_URDF_JOINTS = [f"openarm_right_joint{i}" for i in range(1, 8)]
 
 
+def load_relative_config(model_path: Path | str) -> tuple[PerTimestepNormalizer | None, bool, bool]:
+    """Auto-detect relative action/state settings and load normalizer from checkpoint."""
+    model_path = Path(model_path) if isinstance(model_path, str) else model_path
+    normalizer = None
+    use_relative_actions = False
+    use_relative_state = False
+    
+    # Try local path first
+    if model_path.exists():
+        stats_path = model_path / "relative_stats.pt"
+        if stats_path.exists():
+            normalizer = PerTimestepNormalizer.load(stats_path)
+            use_relative_actions = True
+            print(f"  Loaded per-timestep stats from: {stats_path}")
+        
+        config_path = model_path / "train_config.json"
+        if config_path.exists():
+            cfg = TrainPipelineConfig.from_pretrained(model_path)
+            use_relative_actions = getattr(cfg, "use_relative_actions", use_relative_actions)
+            use_relative_state = getattr(cfg, "use_relative_state", False)
+    else:
+        # Try hub
+        try:
+            from huggingface_hub import hf_hub_download
+            try:
+                stats_file = hf_hub_download(repo_id=str(model_path), filename="relative_stats.pt")
+                normalizer = PerTimestepNormalizer.load(stats_file)
+                use_relative_actions = True
+                print("  Loaded per-timestep stats from hub")
+            except Exception:
+                pass  # No stats file means no relative actions
+            
+            try:
+                config_file = hf_hub_download(repo_id=str(model_path), filename="train_config.json")
+                cfg = TrainPipelineConfig.from_pretrained(Path(config_file).parent)
+                use_relative_actions = getattr(cfg, "use_relative_actions", use_relative_actions)
+                use_relative_state = getattr(cfg, "use_relative_state", False)
+            except Exception:
+                pass
+        except Exception as e:
+            print(f"  Warning: Could not load relative config: {e}")
+    
+    return normalizer, use_relative_actions, use_relative_state
+
+
 def build_kinematics_pipelines(urdf_path: str, left_ee_frame: str, right_ee_frame: str):
     """Build FK and IK pipelines for bimanual robot."""
     left_kinematics = RobotKinematics(
@@ -337,11 +378,6 @@ def main():
     print(f"Task: {TASK_DESCRIPTION}")
     print(f"Episodes: {NUM_EPISODES}")
     print(f"Episode Duration: {EPISODE_TIME_SEC}s")
-    print(f"\nUMI-style relative mode:")
-    print(f"  Relative actions: {USE_RELATIVE_ACTIONS}")
-    print(f"  Relative state: {USE_RELATIVE_STATE}")
-    if RELATIVE_STATS_PATH:
-        print(f"  Stats path: {RELATIVE_STATS_PATH}")
     print("=" * 70)
     
     # Resolve URDF path
@@ -411,15 +447,13 @@ def main():
     )
     print("  Policy loaded")
     
-    # Load relative action normalizer if using relative actions
+    # Auto-detect relative action/state settings from checkpoint
-    relative_normalizer = None
+    relative_normalizer, use_relative_actions, use_relative_state = load_relative_config(HF_MODEL_ID)
-    if USE_RELATIVE_ACTIONS and RELATIVE_STATS_PATH:
+    
-        stats_path = Path(RELATIVE_STATS_PATH)
+    mode = "absolute"
-        if stats_path.exists():
+    if use_relative_actions:
-            print(f"  Loading relative stats from: {stats_path}")
+        mode = "relative actions + state" if use_relative_state else "relative actions only"
-            relative_normalizer = PerTimestepNormalizer.load(stats_path)
+    print(f"  Mode: {mode}")
-        else:
-            print(f"  WARNING: Relative stats not found at {stats_path}")
     
     # Initialize keyboard listener
     print("\n[4/4] Starting evaluation...")
@@ -449,8 +483,8 @@ def main():
                 fps=FPS,
                 duration_s=EPISODE_TIME_SEC,
                 events=events,
-                use_relative_actions=USE_RELATIVE_ACTIONS,
+                use_relative_actions=use_relative_actions,
-                use_relative_state=USE_RELATIVE_STATE,
+                use_relative_state=use_relative_state,
                 relative_normalizer=relative_normalizer,
             )