List Fine-tuning Checkpoints

curl https://api.portkey.ai/v1/fine_tuning/jobs/ftjob-abc123/checkpoints \
  -H "x-portkey-api-key: $PORTKEY_API_KEY" \
  -H "x-portkey-virtual-key: $PORTKEY_PROVIDER_VIRTUAL_KEY"

{
  "data": [
    {
      "id": "<string>",
      "created_at": 123,
      "fine_tuned_model_checkpoint": "<string>",
      "step_number": 123,
      "metrics": {
        "step": 123,
        "train_loss": 123,
        "train_mean_token_accuracy": 123,
        "valid_loss": 123,
        "valid_mean_token_accuracy": 123,
        "full_valid_loss": 123,
        "full_valid_mean_token_accuracy": 123
      },
      "fine_tuning_job_id": "<string>",
      "object": "fine_tuning.job.checkpoint"
    }
  ],
  "object": "list",
  "first_id": "<string>",
  "last_id": "<string>",
  "has_more": true
}