🐛 fix agibot2lerobot bug when action_config is [] (#91)

Co-authored-by: Brucexkm <24210860082@m.fudan.edu.cn>

agibot2lerobot/agibot_h5.py

@@ -1,21 +1,78 @@
 import argparse
-import gc
+import inspect
 import shutil
 import tempfile
 from pathlib import Path
 
 import numpy as np
+import pyarrow as pa
+import pyarrow.parquet as pq
 import ray
 import torch
 from agibot_utils.agibot_utils import get_task_info, load_local_dataset
 from agibot_utils.config import AgiBotWorld_TASK_TYPE
 from agibot_utils.lerobot_utils import compute_episode_stats, generate_features_from_config
-from lerobot.datasets.lerobot_dataset import LeRobotDataset
-from lerobot.datasets.utils import validate_episode_buffer, validate_frame
+from lerobot.datasets.lerobot_dataset import LeRobotDataset, LeRobotDatasetMetadata
+from lerobot.datasets.utils import DEFAULT_EPISODES_PATH, validate_episode_buffer, validate_frame
 from ray.runtime_env import RuntimeEnv
 
 
+class AgiBotDatasetMetadata(LeRobotDatasetMetadata):
+    def _flush_metadata_buffer(self) -> None:
+        """Write all buffered episode metadata to parquet file."""
+        if not hasattr(self, "metadata_buffer") or len(self.metadata_buffer) == 0:
+            return
+
+        combined_dict = {}
+        for episode_dict in self.metadata_buffer:
+            for key, value in episode_dict.items():
+                if key not in combined_dict:
+                    combined_dict[key] = []
+                # Extract value and serialize numpy arrays
+                # because PyArrow's from_pydict function doesn't support numpy arrays
+                val = value[0] if isinstance(value, list) else value
+                combined_dict[key].append(val.tolist() if isinstance(val, np.ndarray) else val)
+
+        first_ep = self.metadata_buffer[0]
+        chunk_idx = first_ep["meta/episodes/chunk_index"][0]
+        file_idx = first_ep["meta/episodes/file_index"][0]
+
+        schema = None if not self.writer else self.writer.schema
+        table = pa.Table.from_pydict(combined_dict, schema=schema)
+
+        if not self.writer:
+            path = Path(self.root / DEFAULT_EPISODES_PATH.format(chunk_index=chunk_idx, file_index=file_idx))
+            path.parent.mkdir(parents=True, exist_ok=True)
+            self.writer = pq.ParquetWriter(path, schema=table.schema, compression="snappy", use_dictionary=True)
+
+        self.writer.write_table(table)
+
+        self.latest_episode = self.metadata_buffer[-1]
+        self.metadata_buffer.clear()
+
+
 class AgiBotDataset(LeRobotDataset):
+    @classmethod
+    def create(cls, *args, **kwargs) -> "AgiBotDataset":
+        sig = inspect.signature(super().create)
+        bound = sig.bind_partial(*args, **kwargs)
+        bound.apply_defaults()
+        params = bound.arguments
+
+        obj = super().create(*args, **kwargs)
+
+        shutil.rmtree(params["root"], ignore_errors=True)
+        obj.meta: AgiBotDatasetMetadata = AgiBotDatasetMetadata.create(
+            repo_id=params["repo_id"],
+            fps=params["fps"],
+            robot_type=params.get("robot_type"),
+            features=params["features"],
+            root=params.get("root"),
+            use_videos=params.get("use_videos", True),
+            metadata_buffer_size=params.get("metadata_buffer_size", 10),
+        )
+        return obj
+
     def add_frame(self, frame: dict) -> None:
         """
         This function only adds the frame to the episode_buffer. Apart from images — which are written in a
@@ -191,11 +248,13 @@ def save_as_lerobot_dataset(agibot_world_config, task: tuple[Path, Path], save_d
             dataset.save_episode(videos=videos, action_config=action_config)
         except Exception as e:
             print(f"{json_file.stem}, episode_{eid}: there are some corrupted mp4s\nException details: {str(e)}")
-            dataset.episode_buffer = None
+            dataset.clear_episode_buffer(delete_images=False)
             continue
-        gc.collect()
+
         print(f"process done for {json_file.stem}, episode_id {eid}, len {len(frames)}")
 
+    dataset.finalize()
+
 
 def main(
     src_path: str,
@@ -247,8 +306,6 @@ def main(
                 with open("output.txt", "a") as f:
                     f.write(f"{task}, exception details: {str(e)}\n")
 
-        ray.shutdown()
-
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()