Installing Tensorflow and Keras on MacOS via Anaconda3

こんにちは！思うところあって最近機械学習を勉強しています。自分の勉強のために英語で記事を書きますが、質問コメントなど日本語でもいただけたらと思います。よろしくお願いします！

Hi. I am a Japanese student majoring in Biology and Medicine. For my practice, I try to post in English. However, feel free to contact me in English!

Main Message

If you are a beginner, follow only one website or package!!

Background

Here I describe what I wanted to do and obstacles I met.
In order to learn Machine Learning, I took a course of Eduonix.
https://www.eduonix.com/applied-machine-learning-for-healthcare
At the very beginning of this course, I had to import Keras. However, I could not import it smoothly possibly due to my environment.
Since I spent plenty of time overcoming this issue, I would like to share what occured and what I did.

Environment

MacBook Pro (2018) 2.3GHz Intel Core i5 16 GB LPDDR3
Intel Iris Plus Graphics 655 1536 MB
macOS Mojave 10.14.1
Anaconda 3.5.0
Tensorflow 0.6.0 Python 3.7.1 (reffered later)

Installation

I initially installed Python and Tensorflow reffering these Qiita(s):
Anaconda でTensorFlowを設定する
 Mac + Python + Anaconda を利用してTensorFlowを動かしてみる
 【Mac】Python3（Anaconda）でTensorFlow環境を構築してみる

One of my fault was that I had tried so many methods to install Python, Tensorflow, etc. At first, based on the first website, I had set up virtual environment. Then, I also installed them via pip or homebrew reffering the other two websites or more.
Though there were no trouble installing Tensorflow, when I try to import Keras, an error occured:

$ python
Python 3.7.0 (default, Jun 28 2018, 07:39:16) 
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import keras
Using TensorFlow backend.
Traceback (most recent call last):
  File "<stdin>", line 1, in    <module>
  File "/anaconda3/lib/python3.7/site-packages/keras/__init__.py", line 3, in <module>
from . import utils
  File "/anaconda3/lib/python3.7/site-packages/keras/utils/__init__.py", line 6, in <module>
from . import conv_utils
  File "/anaconda3/lib/python3.7/site-packages/keras/utils/conv_utils.py", line 9, in <module>
from .. import backend as K
  File "/anaconda3/lib/python3.7/site-packages/keras/backend/__init__.py", line 89, in <module>
from .tensorflow_backend import *
  File "/anaconda3/lib/python3.7/site-packages/keras/backend/tensorflow_backend.py", line 8, in <module>
from tensorflow.python.ops import tensor_array_ops
ImportError: cannot import name 'tensor_array_ops' from 'tensorflow.python.ops' (/anaconda3/lib/python3.7/site-packages/tensorflow/python/ops/__init__.py)

No matter how much I goooooogled, I could find no solution (some websites reported similar symptoms; they recommended installation of tensorflow up-to-date, which in my case already installed).

Etiology

This happend probably because of imcompatibility of Tensorflow 0.6.0 with Python 3.7.1.
I installed that "out-of-date" Tensorflow 0.6.0 because it was the only version that pip supported.

Solution

Finally I hit upon this website.
Keras 環境構築（Mac）
While following this instruction, I realized what virtual environments are. Then I came up with an idea of applying Anaconda navigator.
Taking advantage of Anaconda navigator, which enables easy establishment and installation of packages, I could successfully install Python 3.6.1 and Tensorflow 1.12.0 in the same environment.
In this way, I finally introduced Keras :)

For the future

Always aware of versions which we install
Follow ONLY ONE website or book when you install something (especially before you got used to)
ASK SOMEONE in 15 minutes (be organized about what you're doing)

Map your Mind.

Medical student. Jazz.