Note on word2vec gravity model

murrayds / sci-mobility-emb

Embedding of scientific mobility across institutions, cities, regions, and countries

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Closed skojaku closed 4 years ago

skojaku commented 4 years ago

I update the note on the gravity model and word2vec:

Update the typos (s_i, phi_i)
A minor change in the definition of phi_i, i.e., exclude s_i from phi_i to be consistent with the gravity potential in mechanical physics
rename n_i as pi_i to avoid the confusion between the number of people and that of "mobile" people.