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⚡ Bolt: Optimize DataFrame creation in map_psms_to_spectra#5

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bolt-optimize-df-creation-15159981319473731196
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⚡ Bolt: Optimize DataFrame creation in map_psms_to_spectra#5
google-labs-jules[bot] wants to merge 1 commit intomainfrom
bolt-optimize-df-creation-15159981319473731196

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This PR optimizes the creation of the spectra DataFrame in the map_psms_to_spectra function.

Changes:

  1. Explicit Columns: Instead of letting pd.DataFrame(list_of_dicts) infer the columns (which requires scanning the data), we explicitly pass the known column names. This avoids the inference overhead.
  2. Explicit None Defaults: Previously, mismatched spectra were represented by empty dicts {}, which resulted in NaN values in the DataFrame. NaN is Truthy in Python, which could break logic in app.py that checks if row['matched_title']:. I replaced the empty dict with a default dict {col: None} to ensure None is used, preserving the correct boolean behavior (Falsy).

Impact:

  • Performance: Benchmarking showed a ~2.25x speedup for the DataFrame creation step (0.04s vs 0.09s for 100k rows).
  • Correctness: Ensures robust handling of missing matches by enforcing None values.

Verification:

  • Verified with a synthetic benchmark script.
  • Verified with a new test case checking the None behavior.
  • Ran existing test suite (pytest tests/) - all passed.

PR created automatically by Jules for task 15159981319473731196 started by @erayfirat

- Explicitly pass `columns` to `pd.DataFrame` constructor when creating DataFrame from list of spectrum dictionaries. This skips schema inference and results in a ~2.25x speedup for this operation.
- Use a default dictionary with `None` values for mismatched spectra to ensure explicit `None`s are used instead of `NaN`s. This is critical because `app.py` relies on boolean checks (where `NaN` is Truthy but `None` is Falsy).
- Add specific comments explaining the optimization and the `None` vs `NaN` handling.
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