code: def trend(time, slope=0):
      return slope * time
  
file_path: BigDL/docs/docs/ClusterServingGuide/OtherFrameworkUsers/l08c08_forecasting_with_lstm.py
imports: import numpy
  import tensorflow
  import tensorflow.keras
label_desc: Use image node_id 1 for calling a global function with example usage: trend(time, slope) and returns: unknown