Tries to fit the model to the feature expectations K using stochastic approximation, with the Robbins-Monro stochastic approximation algorithm: theta_{k+1} = theta_k + a_k g_k - a_k e_k where g_k is the gradient vector (= feature expectations E - K) evaluated at the point theta_k, a_k is the sequence a_k = a_0 / k, where a_0 is some step size parameter defined as self.a_0 in the model, and e_k is an unknown error term representing the uncertainty of the estimate of g_k. We assume e_k has nice enough properties for the algorithm to converge.

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