code: def init_weight(self):
      th_multihead_fill(self.self_attn, True)
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddleseg.cvlibs import param_init
  from paddlepanseg.models.param_init import c2_xavier_fill, THLinearInitMixin, th_linear_fill, th_multihead_fill
  from .common import Conv2D, PositionEmbeddingSine
label_desc: Use image node_id 2 for calling the SelfAttentionLayer obj's underlying member method code with example usage: obj.init_weight() without return types