class_docstr: Step for concatenating arrays.
  
  Parameters
  ----------
  axis
      The axis of concatenation (default is -1, the last axis).
  
  name
      Name of the step (optional). If no name is passed, a name will be
      automatically generated.
class_docstr_tok: ["Step","for","concatenating","arrays",".","Parameters","--","--","--","--","--","axis","The","axis","of","concatenation","(","default","is","-1",",","the","last","axis",")",".","name","Name","of","the","step","(","optional",")",".","If","no","name","is","passed",",","a","name","will","be","automatically","generated","."]
code: def transform(self, Xs):
      return np.concatenate(_listify(Xs), axis=self.axis)
  
file_path: baikal/baikal/steps/merge.py
imports: import numpy
  from baikal.steps import Step
  from baikal._core.utils import listify
label_desc: Use image node_id 2 for calling the Concatenate obj's underlying member method code with example usage: obj.transform(Xs) and returns: np