def spontaneousmeme_count(
infecting_vec,
infected_vec,
eventmemes,
M,
):
'''
Returns a vector with count of spontanous infections for memes.
Arguments:
infecting_vec - vector of infecting event ids
infected_vec - vector of event ids
eventmemes - vector of meme ids
M - number of memes
'''
spontaneous_memes = eventmemes[infecting_vec == infected_vec]
updates = np.zeros((M, 1))
for meme in spontaneous_memes:
updates[int(meme)] += 1
return updates
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