class_docstr: Strips out the leading encoder tokens from the concatenated array.
class_docstr_tok: ["Strips","out","the","leading","encoder","tokens","from","the","concatenated","array","."]
code: def __init__(self, mode="train"):
      super().__init__(n_in=3, n_out=1)
      self._mode = mode
  
imports: from trax import fastmath
  from trax import layers
  from trax.fastmath import numpy
  from trax.models.research import configurable_transformer
label_desc: Use image node_id 1 to create a new StripFromConcatenateWithPadding object from inherited base classes: tl with example: obj = StripFromConcatenateWithPadding(mode)