Foward Transfer metric in metrics_summary.csv is the same across methods

[alexanderbuchholz]

The forward transfer metric in the metrics_summary.csv is the same across different methods.

Run with Offline-ER and Joint updater on Mnist.

Expected behavior
I would not expect this to be (strictly) same for different methods.

Example
Joint training

Task ID	Average Accuracy	Forgetting	Forward Transfer	Backward Transfer
1	0.999054	0.000000	0.000000	0.000000
2	0.968869	0.010875	-0.206170	-0.010875
3	0.913238	0.043618	-0.103085	-0.043618
4	0.853757	0.092997	-0.190409	-0.092997
5	0.646799	0.273982	-0.142806	-0.273982

Offline-ER

Task ID	Average Accuracy	Forgetting	Forward Transfer	Backward Transfer
1	0.998582	0.000000	0.000000	0.000000
2	0.977127	0.006619	-0.206170	-0.006619
3	0.956068	0.016186	-0.103085	-0.016186
4	0.948742	0.013383	-0.190409	-0.013383
5	0.932628	0.013746	-0.142806	-0.013746