class_docstr: Stop the optimization when ``|x1 - x2| < delta``
  
  If the last two positions at which the objective has been evaluated
  are less than `delta` apart stop the optimization procedure.
class_docstr_tok: ["Stop","the","optimization","when","``","|x1","-","x2|","<","delta","``","If","the","last","two","positions","at","which","the","objective","has","been","evaluated","are","less","than","`","delta","`","apart","stop","the","optimization","procedure","."]
code: def __init__(self, delta):
      super(EarlyStopper, self).__init__()
      self.delta = delta
  
imports: from time import time
  import numpy
  from guild._skopt.utils import dump
label_desc: Use image node_id 1 to create a new DeltaXStopper object from inherited base classes: EarlyStopper with example: obj = DeltaXStopper(delta)