@type t() :: %Imp.Training.FastSlow.CachedTrajectory{
  behavior_logprobs: [number()],
  cycle: non_neg_integer(),
  id: String.t(),
  input_digest: String.t(),
  output: Imp.Training.FastSlow.Config.json_value(),
  problem_id: String.t(),
  prompt_digest: String.t(),
  response_mask: [0 | 1],
  response_token_ids: [non_neg_integer()],
  reward: number(),
  theta_id: String.t()
}