(3.28) — the mini-batch gradient Ḡ_k is conditionally unbiased with E‖Ḡ_k − ∇Ψ(x^md_k)‖² ≤ σ²/m_k

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(3.28) — the mini-batch gradient Ḡ_k is conditionally unbiased with E‖Ḡ_k − ∇Ψ(x^md_k)‖² ≤ σ²/m_k · Prove2Me