class_docstr: 可以被输入到分类模型中的普通数据集
class_docstr_tok: ["\u53ef\u4ee5\u88ab\u8f93\u5165\u5230\u5206\u7c7b\u6a21\u578b\u4e2d\u7684\u666e\u901a\u6570\u636e\u96c6"]
code: def __getitem__(self, item):
      return {
          "x": jt.Var([self._data[item]]),
          "y": jt.Var([self._data[item]]),
      }
  
file_path: fastNLP/tests/helpers/datasets/jittor_data.py
imports: from fastNLP.envs.imports import _NEED_IMPORT_JITTOR
label_desc: Use image node_id 2 for calling the JittorNormalXYDataset obj's underlying member method code with example usage: obj.__getitem__(item) and returns: dict