Provides struct and type for a FineTuning.DPOMethod.Hyperparameters
@type t() :: %OpenAi.FineTuning.DPOMethod.Hyperparameters{ batch_size: integer() | String.t() | nil, beta: number() | String.t() | nil, learning_rate_multiplier: number() | String.t() | nil, n_epochs: integer() | String.t() | nil }