class_docstr: A Keras Layer implementing BiFPN Node.
code: def _add_wsm(self, initializer):
      for i, _ in enumerate(self.inputs_offsets):
          name = "WSM" + ("" if i == 0 else "_" + str(i))
          self.vars.append(
              self.add_weight(initializer=initializer, name=name)
          )
  
imports: import functools
  from absl import logging
  import numpy
  import tensorflow
  import utils
  from .None import fpn_configs
label_desc: Use image node_id 3 for calling the FNode obj's underlying member method code with example usage: obj._add_wsm(initializer) without return types