docstr: 创建 tensor，并且填入 value 作为值
docstr_tok: ["\u521b\u5efa","tensor\uff0c\u5e76\u4e14\u586b\u5165","value","\u4f5c\u4e3a\u503c"]
code: def create_tensor(self, value: float):
      """
      创建 tensor，并且填入 value 作为值
      """
      value = jittor.Var(value)
      return value
  
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 3 for calling the JittorBackend obj's underlying member method code with example usage: obj.create_tensor(value) and returns: value