**Description:** Implement a reusable evaluator to compute metrics across multiple models. **Metrics Required:** - RMSE - MAE - MAPE - R² **Acceptance Criteria:** - Save metrics as JSON to `reports/metrics.json`. - Support evaluation of multiple models in a single run.
Description:
Implement a reusable evaluator to compute metrics across multiple models.
Metrics Required:
Acceptance Criteria:
reports/metrics.json.