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Sintyoku
1.
進 捗
2.
汎化誤差解析に用いられる技術 𝑠𝑢𝑝 𝑓∈𝐹(𝐿 𝑑
𝑓 − 𝐿 𝑠[𝑓])を抑えるために ・ラデマッハ複雑度 ・カバリングナンバー ・局所ラデマッハ複雑度 等の技術が、確率集中不等式との組み合わせにより使われる。
3.
ラデマッハ複雑度 • Definition Rad(F) =
E[𝑠𝑢𝑝 𝑓∈𝐹 𝑖=1 𝑛 ε𝑖 𝑓( 𝑥𝑖)], ε𝑖 は1/2で1, 1/2で-1を取る確率変数, Eはεとデータx全体に対す る期待値 ・Usage 𝐸[𝑠𝑢𝑝 𝑓∈𝐹(𝐿 𝑑 𝑓 − 𝐿 𝑠[𝑓])] ≤ 2Rad(F) という風に抑えられるため、Rad(F)を抑える方法が見つかれば 汎化誤差を抑えることができる
4.
・局所ラデマッハ複雑度 • Definition f*を、誤差Ld[f]の最小化元とする。 𝐹δ =
{f ∈ 𝐹, 𝐸[(𝑓 − 𝑓∗)2] ≤ δ} と定義する。 このとき、局所ラデマッハ複雑度はRad(𝐹δ)で定義される量のこ とを言います。 ・Usage ロス関数や関数fがある理想的な条件を満たしていれば確率1-𝑒−𝑡 でδ∗ = Rad(𝐹δ∗)となるδ∗を用いて、Ld(f) – Ld(f*) ≤ 𝐶(δ∗ + 𝑡 𝑛 )と なる。
5.
カバリングナンバー • Definition 関数の集合Fの任意の元をある距離|・|について有限集合Gにつ いて、g ∈
Gで | g – f | < εとなるようなGのなかで最少の個数 を持つものを考える。この時、その個数のことをカバリングナン バーという。実際に、カバリグナンバーを用いてラデマッハ複雑 度などを抑えることによるboundは多々見られる
6.
従来のツールの問題点
7.
考察 • 深層学習の誤差を抑える際に、supを考えるとどうしても行列 のノルムや、深層学習の深さや幅に依存する項が出てきてしま いよいboundを得ることができない • 最近の多くの論文が提唱するように、与えられた確率分布や データセット等に関してのみ依存し大きな仮説空間Fには依存 しないようなものが求められる(Kenji
kawaguchi et.al 2018) • (Kenji kawaguchi et.al 2018)では、supを抑えるのではなく直 接深層学習の誤差を評価していて、それらが解析的に導出され ている • 今後は、そこで導かれた量がどのような場合に小さい値を取る のかを考えていきたい
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