docs: def _from_dict(cls, _dict):
          """Initialize a Collection object from a json dictionary."""
          args = {}
          if 'collection_id' in _dict:
              args['collection_id'] = _dict.get('collection_id')
          if 'name' in _dict:
              args['name'] = _dict.get('name')
          if 'description' in _dict:
              args['description'] = _dict.get('description')
          if 'created' in _dict:
              args['created'] = string_to_datetime(_dict.get('created'))
          if 'updated' in _dict:
              args['updated'] = string_to_datetime(_dict.get('updated'))
          if 'status' in _dict:
              args['status'] = _dict.get('status')
          if 'configuration_id' in _dict:
              args['configuration_id'] = _dict.get('configuration_id')
          if 'language' in _dict:
              args['language'] = _dict.get('language')
          if 'document_counts' in _dict:
              args['document_counts'] = DocumentCounts._from_dict(
                  _dict.get('document_counts'))
          if 'disk_usage' in _dict:
              args['disk_usage'] = CollectionDiskUsage._from_dict(
                  _dict.get('disk_usage'))
          if 'training_status' in _dict:
              args['training_status'] = TrainingStatus._from_dict(
                  _dict.get('training_status'))
          if 'source_crawl' in _dict:
              args['source_crawl'] = SourceStatus._from_dict(
                  _dict.get('source_crawl'))
          return cls(**args)