2.2.3. recsys.utils.cy_utils.cy_calc_new_user_cov¶
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recsys.utils.cy_utils.cy_calc_new_user_cov()¶ Calculate new diagonals of the user covariance matrix \(\Sigma_{ui}^{*}\). The formula is described in the equation (6) of the obi-CTR paper.
- Parameters
user_cov (ndarray, shape = (n_latent_dims,)) – Diagonals of user covariance matrix \(\Sigma_{ui}\).
item_mean (ndarray, shape = (n_latent_dims,)) – Item mean vector \(\mathbf{m}_{vj}\).
hypa_rat (int or float) – Prior of “rating” normal distribution \(\sigma_{r}^2\).
- Returns
new_user_cov – New diagonals of the user covariance matrix \(\Sigma_{ui}^{*}\).
- Return type
ndarray, shape = (n_latent_dims,)