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aloha_hdf5_format.py
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aloha_hdf5_format.py
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#!/usr/bin/env python
# Copyright 2024 The HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Contains utilities to process raw data format of HDF5 files like in: https://github.com/tonyzhaozh/act
"""
import gc
import shutil
from pathlib import Path
import h5py
import numpy as np
import torch
import tqdm
from datasets import Dataset, Features, Image, Sequence, Value
from PIL import Image as PILImage
from lerobot.common.datasets.lerobot_dataset import CODEBASE_VERSION
from lerobot.common.datasets.push_dataset_to_hub.utils import (
concatenate_episodes,
get_default_encoding,
save_images_concurrently,
)
from lerobot.common.datasets.utils import (
calculate_episode_data_index,
hf_transform_to_torch,
)
from lerobot.common.datasets.video_utils import VideoFrame, encode_video_frames
def get_cameras(hdf5_data):
# ignore depth channel, not currently handled
# TODO(rcadene): add depth
rgb_cameras = [key for key in hdf5_data["/observations/images"].keys() if "depth" not in key] # noqa: SIM118
return rgb_cameras
def check_format(raw_dir) -> bool:
# only frames from simulation are uncompressed
compressed_images = "sim" not in raw_dir.name
hdf5_paths = list(raw_dir.glob("episode_*.hdf5"))
assert len(hdf5_paths) != 0
for hdf5_path in hdf5_paths:
with h5py.File(hdf5_path, "r") as data:
assert "/action" in data
assert "/observations/qpos" in data
assert data["/action"].ndim == 2
assert data["/observations/qpos"].ndim == 2
num_frames = data["/action"].shape[0]
assert num_frames == data["/observations/qpos"].shape[0]
for camera in get_cameras(data):
assert num_frames == data[f"/observations/images/{camera}"].shape[0]
if compressed_images:
assert data[f"/observations/images/{camera}"].ndim == 2
else:
assert data[f"/observations/images/{camera}"].ndim == 4
b, h, w, c = data[f"/observations/images/{camera}"].shape
assert c < h and c < w, f"Expect (h,w,c) image format but ({h=},{w=},{c=}) provided."
def load_from_raw(
raw_dir: Path,
videos_dir: Path,
fps: int,
video: bool,
episodes: list[int] | None = None,
encoding: dict | None = None,
):
# only frames from simulation are uncompressed
compressed_images = "sim" not in raw_dir.name
hdf5_files = sorted(raw_dir.glob("episode_*.hdf5"))
num_episodes = len(hdf5_files)
ep_dicts = []
ep_ids = episodes if episodes else range(num_episodes)
for ep_idx in tqdm.tqdm(ep_ids):
ep_path = hdf5_files[ep_idx]
with h5py.File(ep_path, "r") as ep:
num_frames = ep["/action"].shape[0]
# last step of demonstration is considered done
done = torch.zeros(num_frames, dtype=torch.bool)
done[-1] = True
state = torch.from_numpy(ep["/observations/qpos"][:])
action = torch.from_numpy(ep["/action"][:])
if "/observations/qvel" in ep:
velocity = torch.from_numpy(ep["/observations/qvel"][:])
if "/observations/effort" in ep:
effort = torch.from_numpy(ep["/observations/effort"][:])
ep_dict = {}
for camera in get_cameras(ep):
img_key = f"observation.images.{camera}"
if compressed_images:
import cv2
# load one compressed image after the other in RAM and uncompress
imgs_array = []
for data in ep[f"/observations/images/{camera}"]:
imgs_array.append(cv2.imdecode(data, 1))
imgs_array = np.array(imgs_array)
else:
# load all images in RAM
imgs_array = ep[f"/observations/images/{camera}"][:]
if video:
# save png images in temporary directory
tmp_imgs_dir = videos_dir / "tmp_images"
save_images_concurrently(imgs_array, tmp_imgs_dir)
# encode images to a mp4 video
fname = f"{img_key}_episode_{ep_idx:06d}.mp4"
video_path = videos_dir / fname
encode_video_frames(tmp_imgs_dir, video_path, fps, **(encoding or {}))
# clean temporary images directory
shutil.rmtree(tmp_imgs_dir)
# store the reference to the video frame
ep_dict[img_key] = [
{"path": f"videos/{fname}", "timestamp": i / fps} for i in range(num_frames)
]
else:
ep_dict[img_key] = [PILImage.fromarray(x) for x in imgs_array]
ep_dict["observation.state"] = state
if "/observations/velocity" in ep:
ep_dict["observation.velocity"] = velocity
if "/observations/effort" in ep:
ep_dict["observation.effort"] = effort
ep_dict["action"] = action
ep_dict["episode_index"] = torch.tensor([ep_idx] * num_frames)
ep_dict["frame_index"] = torch.arange(0, num_frames, 1)
ep_dict["timestamp"] = torch.arange(0, num_frames, 1) / fps
ep_dict["next.done"] = done
# TODO(rcadene): add reward and success by computing them in sim
assert isinstance(ep_idx, int)
ep_dicts.append(ep_dict)
gc.collect()
data_dict = concatenate_episodes(ep_dicts)
total_frames = data_dict["frame_index"].shape[0]
data_dict["index"] = torch.arange(0, total_frames, 1)
return data_dict
def to_hf_dataset(data_dict, video) -> Dataset:
features = {}
keys = [key for key in data_dict if "observation.images." in key]
for key in keys:
if video:
features[key] = VideoFrame()
else:
features[key] = Image()
features["observation.state"] = Sequence(
length=data_dict["observation.state"].shape[1], feature=Value(dtype="float32", id=None)
)
if "observation.velocity" in data_dict:
features["observation.velocity"] = Sequence(
length=data_dict["observation.velocity"].shape[1], feature=Value(dtype="float32", id=None)
)
if "observation.effort" in data_dict:
features["observation.effort"] = Sequence(
length=data_dict["observation.effort"].shape[1], feature=Value(dtype="float32", id=None)
)
features["action"] = Sequence(
length=data_dict["action"].shape[1], feature=Value(dtype="float32", id=None)
)
features["episode_index"] = Value(dtype="int64", id=None)
features["frame_index"] = Value(dtype="int64", id=None)
features["timestamp"] = Value(dtype="float32", id=None)
features["next.done"] = Value(dtype="bool", id=None)
features["index"] = Value(dtype="int64", id=None)
hf_dataset = Dataset.from_dict(data_dict, features=Features(features))
hf_dataset.set_transform(hf_transform_to_torch)
return hf_dataset
def from_raw_to_lerobot_format(
raw_dir: Path,
videos_dir: Path,
fps: int | None = None,
video: bool = True,
episodes: list[int] | None = None,
encoding: dict | None = None,
):
# sanity check
check_format(raw_dir)
if fps is None:
fps = 50
data_dict = load_from_raw(raw_dir, videos_dir, fps, video, episodes, encoding)
hf_dataset = to_hf_dataset(data_dict, video)
episode_data_index = calculate_episode_data_index(hf_dataset)
info = {
"codebase_version": CODEBASE_VERSION,
"fps": fps,
"video": video,
}
if video:
info["encoding"] = get_default_encoding()
return hf_dataset, episode_data_index, info