code: def forward(self, g, x):
      g1 = self.W_g(g)
      x1 = self.W_x(x)
      psi = self.relu(g1 + x1)
      psi = self.psi(psi)
      res = x * psi
      return res
  
imports: import paddle
  import paddle.nn
  from paddleseg.cvlibs import manager
  from paddleseg.models import layers
  from paddleseg import utils
  import numpy
label_desc: Use image node_id 2 for calling the AttentionBlock obj's underlying member method code with example usage: obj.forward(g, x) and returns: res