Unbiased stochastic gradient
= Unbiased stochastic gradient
A random vector $G_s$ is an unbiased stochastic gradient at $x_s$ when $\mathbb E[G_s\mid x_s]=\nabla f(x_s)$.
= Unbiased stochastic gradient
A random vector $G_s$ is an unbiased stochastic gradient at $x_s$ when $\mathbb E[G_s\mid x_s]=\nabla f(x_s)$.