code: def require_grad(self):
      for param in self.params:
          param.require_grad()
  
file_path: chainer/chainerx_cc/examples/mnist_py/train_mnist.py
imports: import argparse
  import gzip
  import pathlib
  import time
  import numpy
  import chainerx
label_desc: Use image node_id 5 for calling the MLP obj's underlying member method code with example usage: obj.require_grad() without return types