def main()

in lerobot/common/policies/pi0/conversion_scripts/compare_with_jax.py [0:0]

• 66 lines of code
• 11 McCabe index (conditional complexity)

def main():
    num_motors = 14
    device = "cuda"
    # model_name = "pi0_aloha_towel"
    model_name = "pi0_aloha_sim"

    if model_name == "pi0_aloha_towel":
        dataset_repo_id = "lerobot/aloha_static_towel"
    else:
        dataset_repo_id = "lerobot/aloha_sim_transfer_cube_human"

    ckpt_torch_dir = Path.home() / f".cache/openpi/openpi-assets/checkpoints/{model_name}_pytorch"
    ckpt_jax_dir = Path.home() / f".cache/openpi/openpi-assets/checkpoints/{model_name}"
    save_dir = Path(f"../openpi/data/{model_name}/save")

    with open(save_dir / "example.pkl", "rb") as f:
        example = pickle.load(f)
    with open(save_dir / "outputs.pkl", "rb") as f:
        outputs = pickle.load(f)
    with open(save_dir / "noise.pkl", "rb") as f:
        noise = pickle.load(f)

    with open(ckpt_jax_dir / "assets/norm_stats.json") as f:
        norm_stats = json.load(f)

    # Override stats
    dataset_meta = LeRobotDatasetMetadata(dataset_repo_id)
    dataset_meta.stats["observation.state"]["mean"] = torch.tensor(
        norm_stats["norm_stats"]["state"]["mean"][:num_motors], dtype=torch.float32
    )
    dataset_meta.stats["observation.state"]["std"] = torch.tensor(
        norm_stats["norm_stats"]["state"]["std"][:num_motors], dtype=torch.float32
    )

    # Create LeRobot batch from Jax
    batch = {}
    for cam_key, uint_chw_array in example["images"].items():
        batch[f"observation.images.{cam_key}"] = torch.from_numpy(uint_chw_array) / 255.0
    batch["observation.state"] = torch.from_numpy(example["state"])
    batch["action"] = torch.from_numpy(outputs["actions"])
    batch["task"] = example["prompt"]

    if model_name == "pi0_aloha_towel":
        del batch["observation.images.cam_low"]
    elif model_name == "pi0_aloha_sim":
        batch["observation.images.top"] = batch["observation.images.cam_high"]
        del batch["observation.images.cam_high"]

    # Batchify
    for key in batch:
        if isinstance(batch[key], torch.Tensor):
            batch[key] = batch[key].unsqueeze(0)
        elif isinstance(batch[key], str):
            batch[key] = [batch[key]]
        else:
            raise ValueError(f"{key}, {batch[key]}")

    # To device
    for k in batch:
        if isinstance(batch[k], torch.Tensor):
            batch[k] = batch[k].to(device=device, dtype=torch.float32)

    noise = torch.from_numpy(noise).to(device=device, dtype=torch.float32)

    from lerobot.common import policies  # noqa

    cfg = PreTrainedConfig.from_pretrained(ckpt_torch_dir)
    cfg.pretrained_path = ckpt_torch_dir
    policy = make_policy(cfg, dataset_meta)

    # loss_dict = policy.forward(batch, noise=noise, time=time_beta)
    # loss_dict["loss"].backward()
    # print("losses")
    # display(loss_dict["losses_after_forward"])
    # print("pi_losses")
    # display(pi_losses)

    actions = []
    for _ in range(50):
        action = policy.select_action(batch, noise=noise)
        actions.append(action)

    actions = torch.stack(actions, dim=1)
    pi_actions = batch["action"]
    print("actions")
    display(actions)
    print()
    print("pi_actions")
    display(pi_actions)
    print("atol=3e-2", torch.allclose(actions, pi_actions, atol=3e-2))
    print("atol=2e-2", torch.allclose(actions, pi_actions, atol=2e-2))
    print("atol=1e-2", torch.allclose(actions, pi_actions, atol=1e-2))