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Markdown
353 lines
11 KiB
Markdown
---
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sort: 3
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title: Scheduler
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weight: 3
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menu:
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docs:
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parent: "vmanomaly-components"
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weight: 3
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aliases:
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- /anomaly-detection/components/scheduler.html
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---
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# Scheduler
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Scheduler defines how often to run and make inferences, as well as what timerange to use to train the model.
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Is specified in `scheduler` section of a config for VictoriaMetrics Anomaly Detection.
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## Parameters
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`class`: str, default=`"scheduler.periodic.PeriodicScheduler"`,
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options={`"scheduler.periodic.PeriodicScheduler"`, `"scheduler.oneoff.OneoffScheduler"`, `"scheduler.backtesting.BacktestingScheduler"`}
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- `"scheduler.periodic.PeriodicScheduler"`: periodically runs the models on new data. Useful for consecutive re-trainings to counter [data drift](https://www.datacamp.com/tutorial/understanding-data-drift-model-drift) and model degradation over time.
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- `"scheduler.oneoff.OneoffScheduler"`: runs the process once and exits. Useful for testing.
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- `"scheduler.backtesting.BacktestingScheduler"`: imitates consecutive backtesting runs of OneoffScheduler. Runs the process once and exits. Use to get more granular control over testing on historical data.
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**Depending on selected class, different parameters should be used**
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## Periodic scheduler
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### Parameters
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For periodic scheduler parameters are defined as differences in times, expressed in difference units, e.g. days, hours, minutes, seconds.
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Examples: `"50s"`, `"4m"`, `"3h"`, `"2d"`, `"1w"`.
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<table>
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<thead>
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<tr>
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<th></th>
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<th>Time granularity</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>s</td>
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<td>seconds</td>
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</tr>
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<tr>
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<td>m</td>
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<td>minutes</td>
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</tr>
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<tr>
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<td>h</td>
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<td>hours</td>
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</tr>
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<tr>
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<td>d</td>
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<td>days</td>
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</tr>
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<tr>
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<td>w</td>
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<td>weeks</td>
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</tr>
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</tbody>
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</table>
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<table>
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<thead>
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<tr>
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<th>Parameter</th>
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<th>Type</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>fit_window</code></td>
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<td>str</td>
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<td><code>"14d"</code></td>
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<td>What time range to use for training the models. Must be at least 1 second.</td>
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</tr>
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<tr>
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<td><code>infer_every</code></td>
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<td>str</td>
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<td><code>"1m"</code></td>
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<td>How often a model will write its conclusions on newly added data. Must be at least 1 second.</td>
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</tr>
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<tr>
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<td><code>fit_every</code></td>
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<td>str, Optional</td>
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<td><code>"1h"</code></td>
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<td>How often to completely retrain the models. If missing value of <code>infer_every</code> is used and retrain on every inference run.</td>
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</tr>
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</tbody>
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</table>
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### Periodic scheduler config example
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```yaml
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scheduler:
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class: "scheduler.periodic.PeriodicScheduler"
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fit_window: "14d"
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infer_every: "1m"
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fit_every: "1h"
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```
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This part of the config means that `vmanomaly` will calculate the time window of the previous 14 days and use it to train a model. Every hour model will be retrained again on 14 days’ data, which will include + 1 hour of new data. The time window is strictly the same 14 days and doesn't extend for the next retrains. Every minute `vmanomaly` will produce model inferences for newly added data points by using the model that is kept in memory at that time.
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## Oneoff scheduler
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### Parameters
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For Oneoff scheduler timeframes can be defined in Unix time in seconds or ISO 8601 string format.
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ISO format supported time zone offset formats are:
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* Z (UTC)
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* ±HH:MM
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* ±HHMM
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* ±HH
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If a time zone is omitted, a timezone-naive datetime is used.
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### Defining fitting timeframe
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<table>
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<thead>
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<tr>
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<th>Format</th>
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<th>Parameter</th>
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<th>Type</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>ISO 8601</td>
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<td><code>fit_start_iso</code></td>
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<td>str</td>
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<td><code>"2022-04-01T00:00:00Z", "2022-04-01T00:00:00+01:00", "2022-04-01T00:00:00+0100", "2022-04-01T00:00:00+01"</code></td>
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<td rowspan=2>Start datetime to use for training a model. ISO string or UNIX time in seconds.</td>
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</tr>
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<tr>
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<td>UNIX time</td>
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<td><code>fit_start_s</code></td>
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<td>float</td>
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<td>1648771200</td>
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</tr>
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<tr>
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<td>ISO 8601</td>
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<td><code>fit_end_iso</code></td>
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<td>str</td>
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<td><code>"2022-04-10T00:00:00Z", "2022-04-10T00:00:00+01:00", "2022-04-10T00:00:00+0100", "2022-04-10T00:00:00+01"</code></td>
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<td rowspan=2>End datetime to use for training a model. Must be greater than <code>fit_start_*</code>. ISO string or UNIX time in seconds.</td>
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</tr>
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<tr>
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<td>UNIX time</td>
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<td><code>fit_end_s</code></td>
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<td>float</td>
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<td>1649548800</td>
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</tr>
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</tbody>
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</table>
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### Defining inference timeframe
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<table>
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<thead>
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<tr>
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<th>Format</th>
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<th>Parameter</th>
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<th>Type</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>ISO 8601</td>
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<td><code>infer_start_iso</code></td>
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<td>str</td>
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<td><code>"2022-04-11T00:00:00Z", "2022-04-11T00:00:00+01:00", "2022-04-11T00:00:00+0100", "2022-04-11T00:00:00+01"</code></td>
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<td rowspan=2>Start datetime to use for a model inference. ISO string or UNIX time in seconds.</td>
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</tr>
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<tr>
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<td>UNIX time</td>
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<td><code>infer_start_s</code></td>
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<td>float</td>
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<td>1649635200</td>
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</tr>
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<tr>
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<td>ISO 8601</td>
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<td><code>infer_end_iso</code></td>
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<td>str</td>
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<td><code>"2022-04-14T00:00:00Z", "2022-04-14T00:00:00+01:00", "2022-04-14T00:00:00+0100", "2022-04-14T00:00:00+01"</code></td>
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<td rowspan=2>End datetime to use for a model inference. Must be greater than <code>infer_start_*</code>. ISO string or UNIX time in seconds.</td>
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</tr>
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<tr>
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<td>UNIX time</td>
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<td><code>infer_end_s</code></td>
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<td>float</td>
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<td>1649894400</td>
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</tr>
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</tbody>
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</table>
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### ISO format scheduler config example
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```yaml
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scheduler:
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class: "scheduler.oneoff.OneoffScheduler"
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fit_start_iso: "2022-04-01T00:00:00Z"
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fit_end_iso: "2022-04-10T00:00:00Z"
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infer_start_iso: "2022-04-11T00:00:00Z"
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infer_end_iso: "2022-04-14T00:00:00Z"
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```
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### UNIX time format scheduler config example
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```yaml
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scheduler:
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class: "scheduler.oneoff.OneoffScheduler"
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fit_start_iso: 1648771200
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fit_end_iso: 1649548800
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infer_start_iso: 1649635200
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infer_end_iso: 1649894400
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```
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## Backtesting scheduler
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### Parameters
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As for [Oneoff scheduler](#oneoff-scheduler), timeframes can be defined in Unix time in seconds or ISO 8601 string format.
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ISO format supported time zone offset formats are:
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* Z (UTC)
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* ±HH:MM
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* ±HHMM
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* ±HH
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If a time zone is omitted, a timezone-naive datetime is used.
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### Defining overall timeframe
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This timeframe will be used for slicing on intervals `(fit_window, infer_window == fit_every)`, starting from the *latest available* time point, which is `to_*` and going back, until no full `fit_window + infer_window` interval exists within the provided timeframe.
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<table>
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<thead>
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<tr>
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<th>Format</th>
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<th>Parameter</th>
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<th>Type</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>ISO 8601</td>
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<td><code>from_iso</code></td>
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<td>str</td>
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<td><code>"2022-04-01T00:00:00Z", "2022-04-01T00:00:00+01:00", "2022-04-01T00:00:00+0100", "2022-04-01T00:00:00+01"</code></td>
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<td rowspan=2>Start datetime to use for backtesting.</td>
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</tr>
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<tr>
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<td>UNIX time</td>
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<td><code>from_s</code></td>
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<td>float</td>
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<td>1648771200</td>
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</tr>
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<tr>
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<td>ISO 8601</td>
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<td><code>to_iso</code></td>
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<td>str</td>
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<td><code>"2022-04-10T00:00:00Z", "2022-04-10T00:00:00+01:00", "2022-04-10T00:00:00+0100", "2022-04-10T00:00:00+01"</code></td>
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<td rowspan=2>End datetime to use for backtesting. Must be greater than <code>from_start_*</code>.</td>
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</tr>
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<tr>
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<td>UNIX time</td>
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<td><code>to_s</code></td>
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<td>float</td>
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<td>1649548800</td>
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</tr>
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</tbody>
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</table>
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### Defining training timeframe
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The same *explicit* logic as in [Periodic scheduler](#periodic-scheduler)
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<table>
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<thead>
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<tr>
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<th>Format</th>
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<th>Parameter</th>
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<th>Type</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>ISO 8601</td>
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<td rowspan=2><code>fit_window</code></td>
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<td rowspan=2>str</td>
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<td><code>"PT1M", "P1H"</code></td>
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<td rowspan=2>What time range to use for training the models. Must be at least 1 second.</td>
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</tr>
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<tr>
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<td>Prometheus-compatible</td>
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<td><code>"1m", "1h"</code></td>
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</tr>
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</tbody>
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</table>
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### Defining inference timeframe
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In `BacktestingScheduler`, the inference window is *implicitly* defined as a period between 2 consecutive model `fit_every` runs. The *latest* inference window starts from `to_s` - `fit_every` and ends on the *latest available* time point, which is `to_s`. The previous periods for fit/infer are defined the same way, by shifting `fit_every` seconds backwards until we get the last full fit period of `fit_window` size, which start is >= `from_s`.
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<table>
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<thead>
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<tr>
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<th>Format</th>
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<th>Parameter</th>
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<th>Type</th>
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<th>Example</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>ISO 8601</td>
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<td rowspan=2><code>fit_every</code></td>
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<td rowspan=2>str</td>
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<td><code>"PT1M", "P1H"</code></td>
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<td rowspan=2>What time range to use previously trained model to infer on new data until next retrain happens.</td>
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</tr>
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<tr>
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<td>Prometheus-compatible</td>
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<td><code>"1m", "1h"</code></td>
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</tr>
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</tbody>
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</table>
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### ISO format scheduler config example
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```yaml
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scheduler:
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class: "scheduler.backtesting.BacktestingScheduler"
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from_start_iso: '2021-01-01T00:00:00Z'
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to_end_iso: '2021-01-14T00:00:00Z'
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fit_window: 'P14D'
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fit_every: 'PT1H'
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```
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### UNIX time format scheduler config example
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```yaml
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scheduler:
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class: "scheduler.backtesting.BacktestingScheduler"
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from_start_s: 167253120
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to_end_s: 167443200
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fit_window: '14d'
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fit_every: '1h'
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``` |