AttributeError: 'Delegate' object has no attribute '_library'
**System information**
- ubuntu 18.04.6 lts
- tflite-runtime installed from Source, Using 'sudo apt-get install python3-tflite-runtime' [version: 2.5.0]
- Python Verison: 3.6
- edgetpu-compiler 16 amd64

**Provide the text output from tflite_convert**
syncx@syncx:~/cubesatnet_improvised/tflite/python/examples/classification$ python3 classify_image.py \
>   --model models/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite \
>   --labels models/inat_bird_labels.txt \
>   --input images/parrot.jpg
Traceback (most recent call last):
  File "classify_image.py", line 122, in <module>
    main()
  File "classify_image.py", line 99, in main
    interpreter = make_interpreter(args.model)
  File "classify_image.py", line 73, in make_interpreter
    {'device': device[0]} if device else {})
  File "/usr/lib/python3/dist-packages/tflite_runtime/interpreter.py", line 160, in load_delegate
    delegate = Delegate(library, options)
  File "/usr/lib/python3/dist-packages/tflite_runtime/interpreter.py", line 89, in __init__
    self._library = ctypes.pydll.LoadLibrary(library)
  File "/usr/lib/python3.6/ctypes/__init__.py", line 426, in LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python3.6/ctypes/__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libedgetpu.so.1: cannot open shared object file: No such file or directory
Exception ignored in: <bound method Delegate.__del__ of <tflite_runtime.interpreter.Delegate object at 0x7fa771c0ae48>>
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/tflite_runtime/interpreter.py", line 124, in __del__
    if self._library is not None:
AttributeError: 'Delegate' object has no attribute '_library'

**Standalone code to reproduce the issue** 
python3 classify_image.py \
  --model models/mobilenet_v2_1.0_224_inat_bird_quant_edgetpu.tflite \
  --labels models/inat_bird_labels.txt \
  --input images/parrot.jpg

I am trying coral dev board micro. So, I tried "https://github.com/google-coral/tflite/tree/master/python/examples/classification" in this example. It produces the above error. I followed the instructions properly and tried everything I found on Google, but I am unsure what is occurring with this issue.

