Get same prediciton quality as tensorflow torsk

[nmheim]

Get same prediciton quality as tensorflow torsk

[nmheim]

In addition to normalizing the data, adding a bias vector to the ESNCell improves prediction a lot (commit 9830b5c). Still have to run over the whole dataset to produce some concrete numbers.

[nmheim]

Check what the internal TanhRNNCell of pytorch does. There is a possible second bias term for the reservoir layer, which could mean that the input and reservoir layers have two seperate activation functions...

[nmheim]

@jamesavery prediction performance should be fixed with 181dc9b

[nmheim]

In hyperparameter optimization check for best tikhonov beta within every iteration