Build FgsaLSTM

[pmhalvor]

Each subtask (target, holder, expression) individually optimized for

• [x] build non one-hot encoded dataset (shape [batch, 3, seq])
• [x] build general BertHead
• [x] build architecture specific FgsaLSTM(BertHead)

  • [x] each subtask gets own biLSTM
  • [x] no sharing between biLSTMs
  • [x] optimize over bert for each task

• [x] long run over night