FlyAI是一个AI竞赛平台,不过多介绍,见官网:https://www.flyai.com/
笔者系统:Ubuntu 16.04 (安装了ROS kinetic)
使用以下命令进行测试时
./flyai test
出现以下错误:
Traceback (most recent call last):
File "main.py", line 47, in <module>
x_train, y_train, x_test, y_test = data.next_batch(args.BATCH) # 读取数据
File "/home/xxx/.flyai/env/lib/python3.6/site-packages/flyai/dataset.py", line 45, in next_batch
x_train = self.processor_x(x_train)
File "/home/xxx/.flyai/env/lib/python3.6/site-packages/flyai/dataset.py", line 103, in processor_x
processor = self.get_method_dict(self.processor, self.model['input_x'], **data)
File "/home/xxx/.flyai/env/lib/python3.6/site-packages/flyai/dataset.py", line 186, in get_method_dict
m = getattr(clz, method_name)
AttributeError: 'NoneType' object has no attribute 'input_x'
1. 解决办法
笔者遇到的错误原因是安装了ROS 的opencv包,添加了一个PYTHONPATH环境变量'/opt/ros/kinetic/lib/python2.7/dist-packages'(且级别比miniconda环境里的高),所以当程序中调用opencv时,默认使用的时ROS里python2.7的,python3里无法引用。解决办法为在程序引用到cv2的地方前去掉这个环境变量(或者在xshrc里弄,但是会影响ros,我选择前者)
找到processor.py(引用cv2的文件),在import cv2前加入:
import sys
sys.path.remove('/opt/ros/kinetic/lib/python2.7/dist-packages')
2. 解决过程
错误原因因人而异,写一下解决过程,希望对你有帮助。
为方便修改文件,使用本地环境调试。
python main.py
报错为:
Traceback (most recent call last):
File "main.py", line 47, in <module>
x_train, y_train, x_test, y_test = data.next_batch(args.BATCH) # 读取数据
File "/home/xxx/miniconda3/envs/PlusWay/lib/python3.6/site-packages/flyai/dataset.py", line 45, in next_batch
x_train = self.processor_x(x_train)
File "/home/xxx/miniconda3/envs/PlusWay/lib/python3.6/site-packages/flyai/dataset.py", line 103, in processor_x
processor = self.get_method_dict(self.processor, self.model['input_x'], **data)
File "/home/xxx/miniconda3/envs/PlusWay/lib/python3.6/site-packages/flyai/dataset.py", line 186, in get_method_dict
m = getattr(clz, method_name)
AttributeError: 'NoneType' object has no attribute 'input_x'
发生在读取数据时,根据路径定位到dataset.py。
错误发生在getattr函数,该函数返回一个对象的属性值,详见:https://www.runoob.com/python/python-func-getattr.html
从报错得知传入了一个NoneType的clz,找到调用该函数的位置,发现传入的clz值为self.processor。
定位self.processor赋值的位置,在__init__时,有processor的赋值:
if config_path is not None:
config = config_path.replace(os.path.sep, '.')
processor_pka = config + "." + processor_pka
self.processor = self.create_instance(processor_pka, clz)
else:
self.processor = self.create_instance(processor_pka, clz)
其中config_path为None,因此错误应该发生在create_instance,找到这个函数:
def create_instance(self, module_name, class_name, *args, **kwargs):
try:
module_meta = __import__(module_name, globals(), locals(),[class_name])
class_meta = getattr(module_meta, class_name)
return class_meta(*args, **kwargs)
except:
return None
发现当__import__失败时,会返回None。
打印module_name和class_name,分别为:processor和['Processor']。
开一个python窗口尝试发现,__import__('processor')会报错。
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/carey/study/FlyAI/VOC2005_FlyAI/processor.py", line 4, in <module>
import cv2
ImportError: /opt/ros/kinetic/lib/python2.7/dist-packages/cv2.so: undefined symbol: PyCObject_Type
因此,错误原因在processor.py文件。
解决对应的问题即可。