Last layer could be sigmoid

[peterdudfield]

Detailed Description

Try using a sigmoid layer as the last linear layer

Context

• some model results went wrong

Possible Implementation

• set the last layer in the linear model to a sigmoid activation function
• https://github.com/openclimatefix/PVNet/blob/main/pvnet/models/multimodal/linear_networks/networks.py#L147

[peterdudfield]

Ill close this, @AUdaltsova tried this and the results werent great. The night times 0s dont help with a signmoid