class_docstr: 基础的 jittor 分类模型
class_docstr_tok: ["\u57fa\u7840\u7684","jittor","\u5206\u7c7b\u6a21\u578b"]
code: def execute(self, x):
      x = self.ac1(self.linear1(x))
      x = self.ac2(self.linear2(x))
      x = self.output(x)
      return x
  
file_path: fastNLP/tests/helpers/models/jittor_model.py
imports: from fastNLP.envs.imports import _NEED_IMPORT_JITTOR
label_desc: Use image node_id 2 for calling the JittorNormalModel_Classification_1 obj's underlying member method code with example usage: obj.execute(x) and returns: x