code: def format(self, node):
      params = self._default_function_params(node)
      return self.template.format(**params)
  
imports: import numpy
  from hls4ml.backends.template import FunctionCallTemplate, LayerConfigTemplate
  from hls4ml.model.layers import Concatenate, Layer, Merge, register_layer
  from hls4ml.model.optimizer import OptimizerPass
label_desc: Use image node_id 2 for calling the BroadcastFunctionTemplate obj's underlying member method code with example usage: obj.format(node) and returns: self