Hexo category setting

An article may belongs to different categories with or without hierarchy, hexo provide appropriate methods to set categories of an article

here are three types of categories you may want your article belongs to

article in category “sparse matrix/scipy.sparse”

we can set the category attribute as:
>   - sparse matrix
>   - scipy.sparse

article in category “tensorflow” and “python”

we can set the category attribute as:
>   - [tensorflow]
>   - [python]

article in category “sparse matrix/scipy.sparse” and “tensorflow”

we can set the category attribute as:
>   - [sparse matrix,scipy.sparse]
>   - [python]