code: def get_cache_size(self):
      return self.attn.attn.get_cache_size()
  
imports: import math
  import torch
  import torch.nn
  import torch.nn.functional
  from fairseq.modules.layer_norm import LayerNorm
  from .adaptive_span_attention import AdaptiveSpan
label_desc: Use image node_id 3 for calling the TransformerSeqLayer obj's underlying member method code with example usage: obj.get_cache_size() and returns: self