code: def forward(self, x):
      for i, layer in enumerate(self.layers):
          x = (
              paddle.nn.functional.relu(x=layer(x))
              if i < self.num_layers - 1
              else layer(x)
          )
      if self.sigmoid_output:
          x = paddle.nn.functional.sigmoid(x=x)
      return x
  
file_path: PaddleSeg/contrib/SegmentAnything/segment_anything/modeling/mask_decoder.py
imports: import paddle
  from typing import List, Tuple, Type
  from common import LayerNorm2d
label_desc: Use image node_id 2 for calling the MLP obj's underlying member method code with example usage: obj.forward(x) and returns: x