docstr: returns a conv2d block
  :return: conv2d block
docstr_tok: ["returns","a","conv2d","block",":","return",":","conv2d","block"]
code: def __call__(self) -> nn.Conv2D:
      """
      returns a conv2d block
      :return: conv2d block
      """
      return nn.Conv2D(
          channels=self.num_filters,
          kernel_size=self.kernel_size,
          strides=self.strides,
      )
  
imports: from types import FunctionType
  from mxnet.gluon import nn
  from rl_coach.architectures import layers
  from rl_coach.architectures.mxnet_components import utils
label_desc: Use image node_id 2 for calling the Conv2d obj's underlying member method code with example usage: obj.__call__() and returns: nn