# Layer L4  --  Forecasting model

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- Layer ID: `l4`
- Category: `construction`
- Sub-layers: 4
- Axes: 6
- Options across axes: 64

## Sub-layers

| Sub-layer | Name | Gate | Axes |
|---|---|---|---|
| `L4_A_model_selection` | Model selection | always | [family](axes/family.md) |
| `L4_B_forecast_strategy` | Forecast strategy | always | [forecast_strategy](axes/forecast_strategy.md) |
| `L4_C_training_window` | Training window | always | [training_start_rule](axes/training_start_rule.md), [refit_policy](axes/refit_policy.md) |
| `L4_D_tuning` | Tuning | always | [search_algorithm](axes/search_algorithm.md) |

```{toctree}
:hidden:
:maxdepth: 1

axes/family
axes/forecast_strategy
axes/training_start_rule
axes/refit_policy
axes/search_algorithm
axes/pi_correction
```