Fix loading and saving of EvaluationReszult

haystack/schema.py

@@ -482,13 +482,20 @@ def __init__(self,
  # which equals the no_answers representation of reader nodes.
  if self.no_answer:
  self.answers = [""]
- self.gold_offsets_in_documents = []
- self.gold_offsets_in_contexts = []
+ self.gold_offsets_in_documents: List[dict] = []
+ self.gold_offsets_in_contexts: List[dict] = []
  else:
  answered = [l.answer for l in self.labels if not l.no_answer and l.answer is not None]
  self.answers = [answer.answer for answer in answered]
- self.gold_offsets_in_documents = [answer.offsets_in_document for answer in answered]
- self.gold_offsets_in_contexts = [answer.offsets_in_context for answer in answered]
+ self.gold_offsets_in_documents = []
+ self.gold_offsets_in_contexts = []
+ for answer in answered:
+ if answer.offsets_in_document is not None:
+ for span in answer.offsets_in_document:
+ self.gold_offsets_in_documents.append({'start': span.start, 'end': span.end})
+ if answer.offsets_in_context is not None:
+ for span in answer.offsets_in_context:
+ self.gold_offsets_in_contexts.append({'start': span.start, 'end': span.end})
 
  # There are two options here to represent document_ids: 
  # taking the id from the document of each label or taking the document_id of each label's answer.