code: def but_first(self, *fns):
      return Pipeline(fns + self.fns)
  
file_path: gluonts/src/gluonts/nursery/glide/pipeline.py
imports: from toolz.functoolz import compose_left
  from gluonts.nursery.glide import Apply, ParApply
  from gluonts.nursery.glide.util import lift
label_desc: Use image node_id 6 for calling the Pipeline obj's underlying member method code with example usage: obj.but_first() and returns: Pipeline