To implement this recipe, you will require a corpus of documents and the wordcloud library. First, install the wordcloud library by running the following code:

    install.packages("wordcloud", dependencies = TRUE)

Since you will require a corpus of documents, let's create the corpus by doing the search through PubMed with the key "Deep Learning". You will need the following libraries to create the corpus:

• pubmed.mineR
• RISmed
• tm