// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.

import { APIResource } from '../../../core/resource';
import { CursorPage, type CursorPageParams, PagePromise } from '../../../core/pagination';
import { RequestOptions } from '../../../internal/request-options';
import { path } from '../../../internal/utils/path';

export class Checkpoints extends APIResource {
  /**
   * List checkpoints for a fine-tuning job.
   *
   * @example
   * ```ts
   * // Automatically fetches more pages as needed.
   * for await (const fineTuningJobCheckpoint of client.fineTuning.jobs.checkpoints.list(
   *   'ft-AF1WoRqd3aJAHsqc9NY7iL8F',
   * )) {
   *   // ...
   * }
   * ```
   */
  list(
    fineTuningJobID: string,
    query: CheckpointListParams | null | undefined = {},
    options?: RequestOptions,
  ): PagePromise<FineTuningJobCheckpointsPage, FineTuningJobCheckpoint> {
    return this._client.getAPIList(
      path`/fine_tuning/jobs/${fineTuningJobID}/checkpoints`,
      CursorPage<FineTuningJobCheckpoint>,
      { query, ...options },
    );
  }
}

export type FineTuningJobCheckpointsPage = CursorPage<FineTuningJobCheckpoint>;

/**
 * The `fine_tuning.job.checkpoint` object represents a model checkpoint for a
 * fine-tuning job that is ready to use.
 */
export interface FineTuningJobCheckpoint {
  /**
   * The checkpoint identifier, which can be referenced in the API endpoints.
   */
  id: string;

  /**
   * The Unix timestamp (in seconds) for when the checkpoint was created.
   */
  created_at: number;

  /**
   * The name of the fine-tuned checkpoint model that is created.
   */
  fine_tuned_model_checkpoint: string;

  /**
   * The name of the fine-tuning job that this checkpoint was created from.
   */
  fine_tuning_job_id: string;

  /**
   * Metrics at the step number during the fine-tuning job.
   */
  metrics: FineTuningJobCheckpoint.Metrics;

  /**
   * The object type, which is always "fine_tuning.job.checkpoint".
   */
  object: 'fine_tuning.job.checkpoint';

  /**
   * The step number that the checkpoint was created at.
   */
  step_number: number;
}

export namespace FineTuningJobCheckpoint {
  /**
   * Metrics at the step number during the fine-tuning job.
   */
  export interface Metrics {
    full_valid_loss?: number;

    full_valid_mean_token_accuracy?: number;

    step?: number;

    train_loss?: number;

    train_mean_token_accuracy?: number;

    valid_loss?: number;

    valid_mean_token_accuracy?: number;
  }
}

export interface CheckpointListParams extends CursorPageParams {}

export declare namespace Checkpoints {
  export {
    type FineTuningJobCheckpoint as FineTuningJobCheckpoint,
    type FineTuningJobCheckpointsPage as FineTuningJobCheckpointsPage,
    type CheckpointListParams as CheckpointListParams,
  };
}