code: def __init__(self):
      super(JittorBackend, self).__init__()
      self._specified = True
  
file_path: fastNLP/fastNLP/core/metrics/backend/jittor_backend/backend.py
imports: import numpy
  from fastNLP.envs.imports import _NEED_IMPORT_JITTOR
  from fastNLP.core.metrics.backend import Backend
label_desc: Use image node_id 1 to create a new JittorBackend object from inherited base classes: Backend with example: obj = JittorBackend()