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Re:Zero End-to-End Lessons Learned

This write-up captures the practical issues observed while running a full Re:Zero chapter pipeline and the improvements baked into the current tooling.

What went wrong

  • Rate limiting and throttling from remote translation services caused retries, empty output, and long end-to-end execution times.
  • Some translation responses returned empty strings or output dominated by placeholder characters.
  • Long chapters exceeded single-request size limits.
  • A lack of per-chapter timing made it hard to compare runs apples-to-apples.

What we changed

  • Added a batch pipeline runner with per-chapter summaries and timing totals.
  • Added translation retry + backoff handling for 429/503 responses.
  • Added an offline translation option (argostranslate) that avoids external rate limits when installed.
  • Added output summaries for pipeline duration and per-stage timing to improve comparability across runs.

Reliability guidance

  • Prefer offline translation when possible for large batch runs.
  • Use chunked translation and apply delay between requests to keep APIs stable.
  • Track summary.json timing totals after each run and compare against prior runs using the same chapter set.

Next improvements

  • Add translation quality scoring to highlight low-confidence chapters.
  • Improve retry logic to include circuit breaking when throttling is sustained.
  • Add regression baselines for large story sets under work/pipeline_runs/.