add DA experiments

experiments/india/006_da_only/da_only.md

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+## DA forecasts only
+
+The idea was to create a forecast for DA (day-ahead) only for Windnet.
+We hope this would bring down the DA MAE values.
+
+We do this by not forecasting the first X hours. 
+
+Unfortunately, it doesnt not look like ignore X hours, make the DA forecast better. 
+
+## Experiments
+
+1. Baseline - [here](https://wandb.ai/openclimatefix/india/runs/miszfep5)
+2. Ignore first 6 hours - [here](https://wandb.ai/openclimatefix/india/runs/uosk0qug)
+3. Ignore first 12 hours - [here](https://wandb.ai/openclimatefix/india/runs/s9cnn4ei)
+
+## Results
+
+| Timestep | all MAE % | 6 MAE % | 12 MAE % |
+| --- | --- |---------|---------|
+| 0-0 minutes | nan | nan     | nan     |
+| 15-15 minutes | nan | nan     | nan     |
+| 30-45 minutes | 0.065 | nan     | nan     |
+| 45-60 minutes | 0.066 | nan     | nan     |
+| 60-120 minutes | 0.063 | nan     | nan     |
+| 120-240 minutes | 0.063 | nan     | nan     |
+| 240-360 minutes | 0.064 | nan     | nan     |
+| 360-480 minutes | 0.065 | 0.068   | nan     |
+| 480-720 minutes | 0.067 | 0.065   | nan     |
+| 720-1440 minutes | 0.068 | 0.065   | 0.065   |
+| 1440-2880 minutes | 0.071 | 0.071   | 0.071   |
+
+![](mae_steps.png "mae_steps")