eval_results.json

{
    "epoch": 4.0,
    "eval_bleu": 0.0,
    "eval_gen_len": 256.0,
    "eval_loss": NaN,
    "eval_runtime": 171.9207,
    "eval_samples": 1000,
    "eval_samples_per_second": 5.817,
    "eval_steps_per_second": 0.39
}