~  cd pytorch
 ~/pytorch  source activate pytorch_env
(pytorch_env)  ⚙  ~/pytorch  conda install -y matplotlib
Solving environment: done


==> WARNING: A newer version of conda exists. <==
  current version: 4.5.12
  latest version: 4.6.4

Please update conda by running

    $ conda update -n base -c defaults conda



## Package Plan ##

  environment location: /Users/taewan/anaconda3/envs/pytorch_env

  added / updated specs:
    - matplotlib


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    pytz-2018.9                |           py37_0         268 KB
    pyparsing-2.3.1            |           py37_0         105 KB
    ------------------------------------------------------------
                                           Total:         373 KB

The following NEW packages will be INSTALLED:

    cycler:     0.10.0-py37_0
    kiwisolver: 1.0.1-py37h0a44026_0
    matplotlib: 3.0.2-py37h54f8f79_0
    pyparsing:  2.3.1-py37_0
    pytz:       2018.9-py37_0


Downloading and Extracting Packages
pytz-2018.9          | 268 KB    | ##################################### | 100%
pyparsing-2.3.1      | 105 KB    | ##################################### | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
(pytorch_env)  ⚙ 