class_docstr: Represents a penalty proportional to the sum of the absolute values of the parameters
  
  Registered as a `Regularizer` with name "l1".
code: def __call__(self, parameter: torch.Tensor) -> torch.Tensor:
      return self.alpha * torch.sum(torch.abs(parameter))
  
file_path: allennlp/allennlp/nn/regularizers/regularizers.py
imports: import torch
  from allennlp.nn.regularizers.regularizer import Regularizer
label_desc: Use image node_id 2 for calling the L1Regularizer obj's underlying member method code with example usage: obj.__call__(parameter) and returns: unknown