class_docstr: ### Generate auto-regressive mask
code: def __init__(self):
      super().__init__()
      self.mask = None
  
imports: from typing import List
  import torch
  from torch import nn
  from labml_helpers.module import Module
  from labml_nn.transformers import MultiHeadAttention, TransformerLayer
  from labml_nn.transformers.feed_forward import FeedForward
  from labml_nn.transformers.utils import subsequent_mask
label_desc: Use image node_id 1 to create a new AutoregressiveMask object from inherited base classes: Module with example: obj = AutoregressiveMask()