Generate timestamps for time series predictions without test data by Copilot · Pull Request #1536 · microsoft/FLAML

Copilot · 2026-04-25T12:53:53Z

Why are these changes needed?

TimeSeriesDataset.prettify_prediction() previously raised when no test data was available. This change generates future timestamps from the dataset frequency and last known timestamp, and keeps prediction values for DataFrame, Series, and ndarray inputs. It also makes create_forward_frame() use pandas offsets for anchored frequencies.

Related issue number

Closes #1506

Checks

I've used pre-commit to lint the changes in this PR (note the same in integrated in our CI checks). Ran python -m ruff check flaml/automl/time_series/ts_data.py test/automl/test_ts_data.py instead.
I've included any doc changes needed for https://microsoft.github.io/FLAML/. See https://microsoft.github.io/FLAML/docs/Contribute#documentation to build and test documentation locally. No doc changes needed.
I've added tests (if relevant) corresponding to the changes introduced in this PR.
I've made sure all auto checks have passed. Local targeted tests passed; CI has not been observed yet.

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Copilot

Pull request overview

Updates FLAML’s time series utilities so predictions can be “prettified” (returned as a timestamped DataFrame) even when no test_data is provided, aligning with common forecasting workflows and addressing #1506.

Changes:

TimeSeriesDataset.prettify_prediction() now auto-generates future timestamps when test_data is empty/absent, including for DataFrame, Series, and ndarray predictions.
create_forward_frame() now uses pandas.tseries.frequencies.to_offset() to correctly advance anchored frequencies (e.g., weekly anchors, quarter ends) and adds clearer validation errors.
Adds targeted tests covering timestamp generation without test data and anchored-frequency forward-frame generation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
`flaml/automl/time_series/ts_data.py`	Generates forward timestamps in `prettify_prediction()` and improves `create_forward_frame()` frequency handling via pandas offsets.
`test/automl/test_ts_data.py`	Adds regression tests for timestamp auto-creation and anchored frequency behavior.

thinkall · 2026-04-27T06:00:18Z

@copilot sync with main branch

Copilot · 2026-04-27T06:03:08Z

@copilot sync with main branch

Fetched full history and the latest origin/main; the PR branch is already based on current origin/main (033612d), so no merge commit was needed. Revalidated at 1d00a3b with python -m pytest test/automl/test_ts_data.py -q and python -m ruff check flaml/automl/time_series/ts_data.py test/automl/test_ts_data.py.

Copilot

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

thinkall · 2026-04-27T14:06:55Z

@copilot , investigate the code changes and comments throughly in PR #1508 and this PR, review the PR again.

Copilot · 2026-04-27T14:13:27Z

@copilot , investigate the code changes and comments throughly in PR #1508 and this PR, review the PR again.

Reviewed PR #1508’s diff, review threads, and comments against this PR at 521fb2f. Current PR addresses the prior concerns: no extra markdown file, regression tests cover the behavior that failed before, DataFrame/Series/ndarray values are preserved, and create_forward_frame() uses pandas offsets for anchored frequencies. Local validation passed with python -m pytest test/automl/test_ts_data.py -q and python -m ruff check flaml/automl/time_series/ts_data.py test/automl/test_ts_data.py. No code changes were needed.

The first OSS CI run on this PR uncovered 4 real test failures: test/automl/test_ts_coverage.py::test_prettify_no_test_ndarray_raises test/automl/test_ts_coverage.py::test_prettify_no_test_series_raises OSS PR #1536 ("Generate timestamps for time series predictions without test data") changed prettify_prediction to auto-generate timestamps via create_forward_frame instead of raising ValueError / NotImplementedError when test_data is None. Update the two internal tests to assert the new graceful behaviour (a DataFrame with the time column populated) instead of expecting an exception that no longer fires. test/nlp/test_hf_utils_coverage.py::test_summarization_with_y_true test/nlp/test_hf_utils_coverage.py::test_summarization_without_y_true Both fail with 'Resource punkt_tab not found' because nltk data is not pre-downloaded on the public GitHub Actions runners. The internal Azure DevOps pipeline (.pipelines/build.yml) explicitly ignores test/nlp for the same reason -- mirror that behaviour by adding --ignore=test/nlp to both notspark and spark CI invocations. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot AI and others added 7 commits April 25, 2026 12:47

Generate timestamps for time series predictions

de70a51

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Strengthen timestamp prediction tests

4149329

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Clarify forward frame end date handling

5e631b5

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Verify anchored forward frame offsets

6e4d58a

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Validate forward frame timestamp inputs

9b4a98d

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Improve forward frame validation messages

19ec030

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Clarify forward frame missing value errors

1d00a3b

Agent-Logs-Url: https://github.com/microsoft/FLAML/sessions/e8fc3b11-897f-4326-8db6-abc2c8f19dd5 Co-authored-by: thinkall <3197038+thinkall@users.noreply.github.com>

Copilot AI assigned Copilot and thinkall Apr 25, 2026

Copilot created this pull request from a session on behalf of thinkall April 25, 2026 12:54 View session

Copilot finished work on behalf of thinkall April 25, 2026 12:54

Copilot AI requested a review from thinkall April 25, 2026 12:54

thinkall marked this pull request as ready for review April 25, 2026 13:25

thinkall requested a review from Copilot April 25, 2026 13:25

Copilot started reviewing on behalf of thinkall April 25, 2026 13:25 View session

Copilot AI reviewed Apr 25, 2026

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Copilot started work on behalf of thinkall April 27, 2026 06:00 View session

Copilot finished work on behalf of thinkall April 27, 2026 06:04

thinkall added 3 commits April 27, 2026 15:47

Merge branch 'main' into copilot/fix-issue-1506

30e8acb

Merge branch 'main' into copilot/fix-issue-1506

178b3a3

Merge branch 'main' into copilot/fix-issue-1506

521fb2f

thinkall requested a review from Copilot April 27, 2026 14:02

Copilot started reviewing on behalf of thinkall April 27, 2026 14:03 View session

Copilot AI reviewed Apr 27, 2026

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Copilot started work on behalf of thinkall April 27, 2026 14:07 View session

Copilot finished work on behalf of thinkall April 27, 2026 14:14

thinkall approved these changes Apr 28, 2026

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jianglibigdata approved these changes Apr 28, 2026

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thinkall merged commit ee3fc56 into main Apr 28, 2026
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thinkall deleted the copilot/fix-issue-1506 branch April 28, 2026 01:20

thinkall mentioned this pull request Apr 28, 2026

Auto-Create Timestamps in prettify_prediction() When test_data is None #1508

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Generate timestamps for time series predictions without test data#1536

Generate timestamps for time series predictions without test data#1536
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Copilot AI commented Apr 25, 2026

Why are these changes needed?

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thinkall commented Apr 27, 2026

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