title: Cannot import name 'tf_utils' when using importing keras
body: <p>I'm using Oracle Linux 7.7, and I installed python3.6 using yum (epel repos). Then I install tensorflow 1.5(since if it goes newer ver I got core dumped) and keras. If I'm importing tensorflow, I got nothing.
  But when I import keras, I got </p>
  
  <pre><code>ImportError: cannot import name 'tf_utils'
  </code></pre>
  
  <p>Here's the full output:</p>
  
  <pre><code>$ python
  Python 3.6.8 (default, Aug  7 2019, 08:02:28) 
  [GCC 4.8.5 20150623 (Red Hat 4.8.5-39.0.1)] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import tensorflow
  &gt;&gt;&gt; import keras
  Using TensorFlow backend.
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/home/reyhan/project/.virtualenvs/keras_tf/lib/python3.6/site-packages/keras/__init__.py", line 3, in &lt;module&gt;
  from . import utils
    File "/home/reyhan/project/.virtualenvs/keras_tf/lib/python3.6/site-packages/keras/utils/__init__.py", line 6, in &lt;module&gt;
  from . import conv_utils
    File "/home/reyhan/project/.virtualenvs/keras_tf/lib/python3.6/site-packages/keras/utils/conv_utils.py", line 9, in &lt;module&gt;
  from .. import backend as K
    File "/home/reyhan/project/.virtualenvs/keras_tf/lib/python3.6/site-packages/keras/backend/__init__.py", line 1, in &lt;module&gt;
  from .load_backend import epsilon
    File "/home/reyhan/project/.virtualenvs/keras_tf/lib/python3.6/site-packages/keras/backend/load_backend.py", line 90, in &lt;module&gt;
  from .tensorflow_backend import *
    File "/home/reyhan/project/.virtualenvs/keras_tf/lib/python3.6/site-packages/keras/backend/tensorflow_backend.py", line 13, in &lt;module&gt;
  from tensorflow.python.keras.utils import tf_utils
  ImportError: cannot import name 'tf_utils'
  </code></pre>
  
  <p>I was using python 3.6 by building it from source before and keras worked fine but since I can't install tkinter for pyplot I uninstall it and using the one from yum instead.</p>