Mar 23, 2017 def fisher_vector_sigma (s0, s1, s2, means, sigma, w, T): return np. float32 ([(s2 [k] -2 * means [k] * s1 [k] + (means [k] * means [k] -sigma [k]) * s0 [k]) / (np. sqrt (2 * w [k]) * sigma [k]) for k in range (0, len (w))]) def normalize (fisher_vector): v = np. sqrt (abs (fisher_vector)) * np. sign (fisher_vector) return v / np. sqrt (np. dot (v, v)) def fisher_vector (samples, means, covs, w):
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