🚀 微调视觉-语言-动作模型：优化速度与成功率

本仓库包含适用于LIBERO-Object的OpenVLA-OFT检查点，相关内容详见论文Fine-Tuning Vision-Language-Action Models: Optimizing Speed and Success。OpenVLA-OFT通过采用优化的微调技术，相较于基础的OpenVLA模型有了显著改进。

项目页面：https://openvla-oft.github.io/

代码仓库：https://github.com/openvla-oft/openvla-oft

其他OpenVLA-OFT检查点请见：https://huggingface.co/moojink?search_models=oft

🚀 快速开始

此示例展示了如何使用预训练的OpenVLA-OFT检查点生成动作块。请确保你已按照GitHub README中的说明设置好conda环境。

基础用法

import pickle
from experiments.robot.libero.run_libero_eval import GenerateConfig
from experiments.robot.openvla_utils import get_action_head, get_processor, get_proprio_projector, get_vla, get_vla_action
from prismatic.vla.constants import NUM_ACTIONS_CHUNK, PROPRIO_DIM
# Instantiate config (see class GenerateConfig in experiments/robot/libero/run_libero_eval.py for definitions)
cfg = GenerateConfig(
    pretrained_checkpoint = "moojink/openvla-7b-oft-finetuned-libero-spatial",
    use_l1_regression = True,
    use_diffusion = False,
    use_film = False,
    num_images_in_input = 2,
    use_proprio = True,
    load_in_8bit = False,
    load_in_4bit = False,
    center_crop = True,
    num_open_loop_steps = NUM_ACTIONS_CHUNK,
    unnorm_key = "libero_spatial_no_noops",
)
# Load OpenVLA-OFT policy and inputs processor
vla = get_vla(cfg)
processor = get_processor(cfg)

# Load MLP action head to generate continuous actions (via L1 regression)
action_head = get_action_head(cfg, llm_dim=vla.llm_dim)
# Load proprio projector to map proprio to language embedding space
proprio_projector = get_proprio_projector(cfg, llm_dim=vla.llm_dim, proprio_dim=PROPRIO_DIM)

# Load sample observation:
#   observation (dict): {
#     "full_image": primary third-person image,
#     "wrist_image": wrist-mounted camera image,
#     "state": robot proprioceptive state,
#     "task_description": task description,
#   }
with open("experiments/robot/libero/sample_libero_spatial_observation.pkl", "rb") as file:
    observation = pickle.load(file)
# Generate robot action chunk (sequence of future actions)
actions = get_vla_action(cfg, vla, processor, observation, observation["task_description"], action_head, proprio_projector)
print("Generated action chunk:")
for act in actions:
    print(act)

📄 许可证

本项目采用MIT许可证。

📚 引用

@article{kim2025fine,
  title={Fine-Tuning Vision-Language-Action Models: Optimizing Speed and Success},
  author={Kim, Moo Jin and Finn, Chelsea and Liang, Percy},
  journal={arXiv preprint arXiv:2502.19645},
  year={2025}
}