bibli_data_table        A selected dataset of bibliometric data on the
                        topic of "Library science"
doc_group               Construct network of documents based on keyword
                        co-occurrence
keyword_clean           Automatic keyword cleaning and transfer to tidy
                        format
keyword_cloud           Draw word cloud for grouped keywords
keyword_extract         Extract keywords from raw text
keyword_group           Construct network from a tidy table and divide
                        them into groups
keyword_merge           Merge keywords that supposed to have same
                        meanings
keyword_network         Flexiable visualization of network (alternative
                        to 'keyword_vis')
keyword_table           Display the table with different groups of
                        keywords
keyword_vis             Visualization of grouped keyword co-occurrence
                        network
make_dict               Making one's own dictionary
