运行Parrot示例脚本报错：ValueError: 无法加载edgetpu.dll

问题重现 #

执行命令：

python examples/classify_image.py --model test_data/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite --labels test_data/inat_bird_labels.txt --input test_data/parrot.jpg

完整报错堆栈：

Microsoft Windows [Version 10.0.22621.1992]
(c) Microsoft Corporation. All rights reserved.

C:\Users\chris>cd C:\Users\chris\coral\pycoral

C:\Users\chris\coral\pycoral>python examples/classify_image.py --model     test_data/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite --labels test_data/inat_bird_labels.txt --input test_data/parrot.jpg
Traceback (most recent call last):
File "C:\Users\chris\AppData\Local\Programs\Python\Python39\lib\site-packages\tflite_runtime\interpreter.py", line 160, in load_delegate
  delegate = Delegate(library, options)
File "C:\Users\chris\AppData\Local\Programs\Python\Python39\lib\site-packages\tflite_runtime\interpreter.py", line 119, in __init__
  raise ValueError(capture.message)
ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\chris\coral\pycoral\examples\classify_image.py", line 121, in <module>
  main()
File "C:\Users\chris\coral\pycoral\examples\classify_image.py", line 71, in main
  interpreter = make_interpreter(*args.model.split('@'))
File "C:\Users\chris\AppData\Local\Programs\Python\Python39\lib\site-packages\pycoral\utils\edgetpu.py", line 87, in make_interpreter
  delegates = [load_edgetpu_delegate({'device': device} if device else {})]
File "C:\Users\chris\AppData\Local\Programs\Python\Python39\lib\site-packages\pycoral\utils\edgetpu.py", line 52, in load_edgetpu_delegate
  return tflite.load_delegate(_EDGETPU_SHARED_LIB, options or {})
File "C:\Users\chris\AppData\Local\Programs\Python\Python39\lib\site-packages\tflite_runtime\interpreter.py", line 162, in load_delegate
  raise ValueError('Failed to load delegate from {}\n{}'.format(
ValueError: Failed to load delegate from edgetpu.dll

排查与解决步骤 #

• 确认Python版本与位数：PyCoral在Windows环境下仅支持Python 3.9 64位，32位Python无法兼容64位的edgetpu.dll。执行以下命令检查当前Python位数：

  python -c "import sys; print(sys.maxsize > 2**32)"
  

  返回True为64位，False则需重装64位Python 3.9。
• 匹配依赖版本：确保pycoral、tflite-runtime与edgetpu驱动版本完全兼容，建议安装官方指定的稳定版本：

  pip install pycoral==2.0.0 tflite-runtime==2.5.0.post1
  

  同时确认edgetpu.dll是从官方Coral驱动包中获取的对应版本，不要使用非官方来源的文件。
• 权限与路径检查：
  • 以管理员权限启动CMD终端，避免加载系统库时的权限限制。
  • 检查系统PATH是否包含C:\Windows\System32（默认已包含，若未添加需手动补充）。
• 硬件连接验证：若使用USB Coral加速器，确认设备已正确连接，Windows设备管理器中无设备异常（黄色感叹号），驱动安装完整。

内容的提问来源于stack exchange，提问作者Chris Doherty