AMSGrad

public typealias Model = Model

public var learningRate: Float

public var beta1: Float

public var beta2: Float

public var epsilon: Float

public var decay: Float

public var step: Int

public var firstMoments: Model.TangentVector

public var secondMoments: Model.TangentVector

public var secondMomentsMax: Model.TangentVector

public init(
  for model: __shared Model,
  learningRate: Float = 1e-3,
  beta1: Float = 0.9,
  beta2: Float = 0.999,
  epsilon: Float = 1e-8,
  decay: Float = 0
)

public func update(_ model: inout Model, along direction: Model.TangentVector)

public required init(copying other: AMSGrad, to device: Device)