code: def get_learning_rate(optimizer):
      for param in optimizer.param_groups:
          return param["lr"]
  
file_path: dgl/examples/pytorch/dtgrnn/utils.py
imports: import dgl
  import numpy
  import scipy.sparse
  import torch
  import torch.nn
label_desc: Use image node_id 2 for calling a global function with example usage: get_learning_rate(optimizer) and returns: param