运行demo时报如下错误：tensorflow.python.framework.errors_impl.NotFoundError: /usr/local/lib/python2.7/dist-packages/tf_euler/python/euler_ops/libtf_euler.so: undefined symbol: _ZN10tensorflow12OpDefBuilder4AttrESs

其中tensorflow是源码安装的1.12,euler-gl是pip安装的，运行快速开始的demo时报了如下错误：
Traceback (most recent call last):
File "/usr/lib/python2.7/runpy.py", line 163, in _run_module_as_main
mod_name, _Error)
File "/usr/lib/python2.7/runpy.py", line 111, in _get_module_details
__import__(mod_name) # Do not catch exceptions initializing package
File "/usr/local/lib/python2.7/dist-packages/tf_euler/__init__.py", line 21, in
from tf_euler.python import encoders
File "/usr/local/lib/python2.7/dist-packages/tf_euler/python/encoders.py", line 24, in
from tf_euler.python import euler_ops
File "/usr/local/lib/python2.7/dist-packages/tf_euler/python/euler_ops/__init__.py", line 20, in
from tf_euler.python.euler_ops.base import *
File "/usr/local/lib/python2.7/dist-packages/tf_euler/python/euler_ops/base.py", line 31, in
_LIB_OP = tf.load_op_library(_LIB_PATH)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/framework/load_library.py", line 60, in load_op_library
lib_handle = py_tf.TF_LoadLibrary(library_filename)
tensorflow.python.framework.errors_impl.NotFoundError: /usr/local/lib/python2.7/dist-packages/tf_euler/python/euler_ops/libtf_euler.so: undefined symbol: _ZN10tensorflow12OpDefBuilder4AttrESs

Reproduce the quick-start demo with source-built TensorFlow 1.12 and the pip-installed euler-gl package. Start at tf_euler/python/euler_ops/base.py, where libtf_euler.so is loaded, and inspect the reported undefined symbol and package binary compatibility. Done means the demo imports and runs without the NotFoundError.

Written by the indexing model from the issue text.