class_docstr: number of changes between positive and negative slope among three consecutive samples
  above a certain threshold for each variable in the segmented time series
class_docstr_tok: ["number","of","changes","between","positive","and","negative","slope","among","three","consecutive","samples","above","a","certain","threshold","for","each","variable","in","the","segmented","time","series"]
code: def __init__(self, threshold=0):
      self.threshold = threshold
  
imports: import numpy
  from scipy import stats
label_desc: Use image node_id 1 to create a new slope_sign_changes object from inherited base classes: object with example: obj = slope_sign_changes(threshold)