import tensorflow出错：

from tensorflow.python.keras._impl.keras.backend import abs 
ImportError: cannot import name 'abs'

解决方案：参考

pip uninstall tensorflow protobuf --yes
find $CONDA_PREFIX -name "tensorflow" | xargs -Ipkg rm -rfv pkg
pip install --ignore-installed --upgrade https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-1.9.0-cp36-cp36m-linux_x86_64.whl --no-cache-dir

后面安装tensorflow我改成了安装1.8.0版本，这个可以根据自己需要安装不同版本。

安装过程中出现两个问题：以下图片红色字体部分

问题1：distributed 1.21.8 requires msgpack, which is not installed.
解决：pip3 install msgpack
问题2：tensorflow-tensorboard 0.4.0 has requirement bleach==1.5.0, but you'll have bleach 3.0.2 which is incompatible.
解决：pip3 uninstall bleach， pip3 install bleach==1.5.0

最后import tensorflow成功！！