TF-IDF Word Embedding

e:ttfidf(t,d1,D),,tfidf(t,d#(D),D)e: t \mapsto\left\langle\operatorname{tfidf}\left(t, d_1, D\right), \ldots, \operatorname{tfidf}\left(t, d_{\#(D)}, D\right)\right\rangle

Intuition Words that occur in similar documents are similar.