docstr: Forward function.
docstr_tok: ["Forward","function","."]
code: def forward(self, x):
      """Forward function."""
      x = self._transform_inputs(x)
      x = self.deconv_layers(x)
      x = self.final_layer(x)
  
      return x
  
file_path: PaddleDetection/ppdet/modeling/heads/vitpose_head.py
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register
  from ppdet.modeling.keypoint_utils import resize, flip_back
  from paddle.nn.initializer import TruncatedNormal, Constant, Normal
  from ppdet.modeling.layers import ConvTranspose2d, BatchNorm2d
label_desc: Use image node_id 5 for calling the TopdownHeatmapSimpleHead obj's underlying member method code with example usage: obj.forward(x) and returns: x