docstr: Set the learning rate.
docstr_tok: ["Set","the","learning","rate","."]
code: def set_lr(self, lr):
      """Set the learning rate."""
      for param_group in self.param_groups:
          param_group["lr"] = lr
  
imports: import torch
  from fairseq import utils
  from fairseq.dataclass.utils import gen_parser_from_dataclass
  from collections import defaultdict
label_desc: Use image node_id 10 for calling the FairseqOptimizer obj's underlying member method code with example usage: obj.set_lr(lr) without return types