docstr: returns a mxnet dense layer
  :return: dense layer
docstr_tok: ["returns","a","mxnet","dense","layer",":","return",":","dense","layer"]
code: def __call__(self):
      """
      returns a mxnet dense layer
      :return: dense layer
      """
      # Set flatten to False for consistent behavior with tf.layers.dense
      return nn.Dense(self.units, flatten=False)
  
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 Dense obj's underlying member method code with example usage: obj.__call__() and returns: nn