code: def forward(self, x):
      if hasattr(self, "conv"):
          y = self.conv(x)
      else:
          if self.alpha:
              y = self.conv1(x) + self.alpha * self.conv2(x)
          else:
              y = self.conv1(x) + self.conv2(x)
      y = self.act(y)
      return y
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle import ParamAttr
  from paddle.regularizer import L2Decay
  from paddle.nn.initializer import Constant
  from ppdet.modeling.ops import get_act_fn
  from ppdet.core.workspace import register, serializable
  from ..shape_spec import ShapeSpec
label_desc: Use image node_id 2 for calling the RepVggBlock obj's underlying member method code with example usage: obj.forward(x) and returns: y