code: def _is_merge_layer(layer):
      for lt in _KERAS_MERGE_LAYERS:
          if isinstance(layer, lt):
              return True
      return False
  
imports: import keras
  import numpy
  import six
  from distutils.version import StrictVersion
label_desc: Use image node_id 3 for calling a global function with example usage: _is_merge_layer(layer) and returns: False, True