TensorFlow on Raspbian Stretch ImportError - tensorflow

Question

I built TensorFlow from source on Raspbian Stretch. I encountered a problem though when starting up TensorFlow. I get an ImportError as shown below:
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 58, in
from tensorflow.python.pywrap_tensorflow_internal import *
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow_internal.py", line 28, in
_pywrap_tensorflow_internal = swig_import_helper()
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow_internal.py", line 24, in swig_import_helper
_mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)
File "/usr/lib/python3.5/imp.py", line 242, in load_module
return load_dynamic(name, filename, file)
File "/usr/lib/python3.5/imp.py", line 342, in load_dynamic
return _load(spec)
ImportError: /usr/local/lib/python3.5/dist-packages/tensorflow/python/_pywrap_tensorflow_internal.so: undefined symbol: _ZN10tensorflow9ConcatCPUINS_8bfloat16EEEvPNS_10DeviceBaseERKSt6vectorISt10unique_ptrINS_6TTypesIT_Li2EiE11ConstMatrixESt14default_deleteIS9_EESaISC_EEPNS8_6MatrixE
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "idex.py", line 1, in
import gui
File "/home/pi/Desktop/IDEX/scripts/gui.py", line 10, in
import fun_util
File "signlang/fun_util.py", line 3, in
import tensorflow as tf
File "/usr/local/lib/python3.5/dist-packages/tensorflow/init.py", line 24, in
from tensorflow.python import * # pylint: disable=redefined-builtin
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/init.py", line 49, in
from tensorflow.python import pywrap_tensorflow
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 74, in
raise ImportError(msg)
ImportError: Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 58, in
from tensorflow.python.pywrap_tensorflow_internal import *
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow_internal.py", line 28, in
_pywrap_tensorflow_internal = swig_import_helper()
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/pywrap_tensorflow_internal.py", line 24, in swig_import_helper
_mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)
File "/usr/lib/python3.5/imp.py", line 242, in load_module
return load_dynamic(name, filename, file)
File "/usr/lib/python3.5/imp.py", line 342, in load_dynamic
return _load(spec)
ImportError: /usr/local/lib/python3.5/dist-packages/tensorflow/python/_pywrap_tensorflow_internal.so: undefined symbol: _ZN10tensorflow9ConcatCPUINS_8bfloat16EEEvPNS_10DeviceBaseERKSt6vectorISt10unique_ptrINS_6TTypesIT_Li2EiE11ConstMatrixESt14default_deleteIS9_EESaISC_EEPNS8_6MatrixE
Failed to load the native TensorFlow runtime.
See https://www.tensorflow.org/install/install_sources#common_installation_problems
for some common reasons and solutions. Include the entire stack trace
above this error message when asking for help.
I've tried searching for this problem but I couldnt find anything for this particular undefined symbol.

Answer 1

I was able to install TF with Keras using pip3 on Raspbian Stretch. It is much faster then building it.
Here what I run following https://installvirtual.com/how-to-install-tensorflow-on-raspberry-pi/ :
sudo apt update
sudo apt install python3-dev python3-pip
sudo apt install libatlas-base-dev
sudo pip3 install -U virtualenv
pip3 install tensorflow
sudo pip3 install keras