Fix get_integer_time precision and zero handling by Saptami191 · Pull Request #494 · mllam/neural-lam

Saptami191 · 2026-03-22T18:35:49Z

Describe your changes

Fix get_integer_time precision issues and zero timedelta handling.

Uses integer microseconds instead of float computation to avoid rounding errors and ensure correct unit detection.

No additional dependencies.

Issue Link

Closes #468

Type of change

🐛 Bug fix (non-breaking change that fixes an issue)
✨ New feature (non-breaking change that adds functionality)
💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
📖 Documentation (Addition or improvements to documentation)

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My branch is up-to-date with the target branch - if not update your fork with the changes from the target branch (use pull with --rebase option if possible).
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- fixes

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Saptami191 · 2026-03-22T18:57:36Z

@joeloskarsson Recreated this PR after fixing earlier issues with the template and workflow. The code, tests, and linting are now clean and aligned with project guidelines. Would appreciate a review.

kshirajahere

I think the integer-microseconds direction is the right fix, but I think there is still few thing worth addressing before merge.

kshirajahere · 2026-03-22T19:51:13Z

neural_lam/utils.py

+        (0, 'seconds')
    """
-    total_seconds = tdelta.total_seconds()
+    total_microseconds = (


The new implementation is fine, but this helper’s contract is still inconsistent across the tree: compute_standardization_stats.py still calls get_integer_time(step_length.total_seconds()), i.e. with a float rather than a timedelta. I think we should either update that caller in the same slice or explicitly tighten/document the contract here.

kshirajahere · 2026-03-22T19:51:40Z

tests/test_utils.py

+    assert get_integer_time(timedelta(0)) == (0, "seconds")
+
+
+def test_milliseconds():


Since this PR is specifically about float-precision avoidance, I think it would be good to add one direct regression test for the issue-body example (timedelta(days=0.001) -> (86400, "milliseconds")) here as well, rather than leaving that behavior covered only by the doctest.

This is actually already tested in the docstring.

kshirajahere · 2026-03-22T19:56:31Z

CHANGELOG.md


 - Fix typo in `ar_model.py` that causes `AttributeError` during evaluation [\#204](https://github.com/mllam/neural-lam/pull/204) @ritinikhil

+- Fix `get_integer_time` to avoid floating-point precision issues and correctly handle zero timedelta [#469](https://github.com/mllam/neural-lam/pull/469) @Saptami191


Shud point to #494 instead of #469

Thanks for the review! I hve addressed all three points.

observingClouds

Thanks for this PR. I left a few comments and suggest a few changes.

observingClouds · 2026-03-23T08:57:26Z

tests/test_utils.py

+    assert get_integer_time(timedelta(0)) == (0, "seconds")
+
+
+def test_milliseconds():


This is actually already tested in the docstring.

observingClouds · 2026-03-23T08:58:26Z

tests/test_utils.py

All these newly added tests are already covered by the doctest. No need to replicate them here. If you think a case is missing in the docstring, please add them there.

@observingClouds thanks for the review! yeah all are tested in docstring. i will remove this test file .actually it was part of proving the fix is correct.
Should I also add a doctest for negative timedelta

get_integer_time(timedelta(days=-7))
(-1, 'weeks')

it will represent a duration in the past 7 days ago.
or is that out of scope for this PR?

Saptami191 added 2 commits March 22, 2026 18:21

Fix get_integer_time precision and zero handling

1b520a1

Fix lint issues

f2fec1f

kshirajahere reviewed Mar 22, 2026

View reviewed changes

Saptami191 added 2 commits March 22, 2026 20:11

Update changelog

ee7a5ab

Address review: add regression test and fix inconsistent caller

ca6b49d

sadamov self-requested a review March 23, 2026 05:10

observingClouds requested changes Mar 23, 2026

View reviewed changes

observingClouds self-assigned this Mar 23, 2026

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Fix get_integer_time precision and zero handling#494

Fix get_integer_time precision and zero handling#494
Saptami191 wants to merge 4 commits intomllam:mainfrom
Saptami191:fix-get-integer-time-v2

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Saptami191 Mar 23, 2026 •

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		assert get_integer_time(timedelta(0)) == (0, "seconds")


		def test_milliseconds():


		- Fix typo in `ar_model.py` that causes `AttributeError` during evaluation [\#204](https://github.com/mllam/neural-lam/pull/204) @ritinikhil

		- Fix `get_integer_time` to avoid floating-point precision issues and correctly handle zero timedelta [#469](https://github.com/mllam/neural-lam/pull/469) @Saptami191

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Saptami191 commented Mar 22, 2026

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Saptami191 Mar 23, 2026 •

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